JP4997708B2 - Method for producing fluorinated alkyl group-containing oligomer - Google Patents

Description

  A copolymer obtained by copolymerizing a monomer having a fluorinated alkyl group and another monomer having no fluorinated alkyl group has been widely used as a fluorinated polymerization surfactant. Such polymers can easily synthesize a wide range of polymers from water-soluble to oil-soluble depending on the introduction amount of monomers having a fluorinated alkyl group, selection of other monomer species, etc. Suitable for application. When the fluorine-containing polymer is applied as a surfactant, the surface active ability is usually increased as the fluorine atom content in the polymer increases. However, when the fluorine atom content exceeds a certain amount, the medium ( For example, the solubility in a solvent or a resin is lowered, and as a result, the surface activity ability is lowered. When fluorine-containing surfactants having the same fluorine atom content are compared, the solubility in the medium is better when the molecular weight is lower. In particular, in the case of a fluorine-containing polymerization type surfactant, the fluorine-containing portion is likely to aggregate. Therefore, when the fluorine atom content is high, the solubility in various media is remarkably reduced except for halogen-containing media, which has many handling problems. . For these reasons, when obtaining a fluorine-containing polymerization surfactant, a so-called oligomer having a molecular weight of several thousand levels is often designed.

  As a method for producing a fluorinated alkyl group-containing oligomer, for example, a method using a large amount of a chain transfer agent in combination with a polymerization initiator has been proposed (see, for example, Patent Document 1). Patent Document 1 describes that the preferred weight average molecular weight of the fluorine-containing polymerization surfactant is about 2,000 to 20,000, and the most preferred is 2,000 to 7,000. As a method for preparing such a polymer, a method of polymerizing in an ethyl acetate solution using 0.046 mol of a polymerization initiator and 0.046 mol of a chain transfer agent with respect to the total number of moles of monomers used as raw materials can be mentioned. It has been. However, when a chain transfer agent is used, unreacted substances may remain and adversely affect the surface activity. In addition, the most commonly used thiol compounds with a high chain transfer coefficient have problems such as odor due to residual unreacted substances, and further problems such as discoloration and reduced surface active ability during long-term storage of surfactants. is there.

  In addition, a method using a difference in solubility between monomers and oligomers in a solvent has been proposed (see, for example, Patent Document 2). In Patent Document 2, the monomer mixture before polymerization is dissolved, but the resulting polymer is precipitated in a “precipitation medium” in which the polymerization initiator is added in an amount of 0.001 to 0.001 to the total number of moles of monomers. A low viscosity (low molecular weight) polymer useful as a foam extinguishing agent is obtained without using a chain transfer agent by performing radical polymerization using 0.10 mol, preferably in a range of 0.006 to 0.02 mol. . However, in the method using the precipitation medium described in the publication, the solvent is replaced after the polymerization, or the polymer obtained as a precipitate is taken out once, or after the solvent is distilled off, the solution is in an easy-to-use solution state. It is necessary to redissolve in a highly soluble solvent. Such operations such as solvent substitution, solvent distillation, solid removal, drying and re-dissolution not only increase the production time, but also the composition of the monomer mixture, the composition of the polymer, the molecular weight, the type of the precipitation medium, etc. Depending on the nature of the precipitate (oligomer) depending on the operation, the operation may be extremely difficult.

JP-A-7-173225 (page 5-7) JP-T-2002-517530 (pages 9-14)

  In view of the above situation, an object of the present invention is to provide a production method for obtaining a fluorinated alkyl group-containing oligomer by a simple method without using a chain transfer agent.

Accordingly, the inventors of the present invention have made extensive studies to solve the above-mentioned problems. As a result, the ethylenically unsaturated monomer (A) containing a fluorinated alkyl group and a macromonomer having a polyoxyalkylene structure is used. The polymerization initiator (C) is used in an amount of 0.1 to 0.6 mol based on 1 mol of the ethylenically unsaturated group in the ethylenically unsaturated monomer (I) containing the monomer (B). A method for producing a fluorinated alkyl group-containing oligomer characterized by polymerizing the monomers (I) has been found, and the present invention has been completed.

That is, the present invention relates to an ethylenically unsaturated monomer containing a fluorinated alkyl group-containing ethylenically unsaturated monomer (A) and an ethylenically unsaturated monomer (B) which is a macromonomer having a polyoxyalkylene structure. The monomer (I) is polymerized and fluorinated with 0.1 to 0.6 mol of a polymerization initiator (C) per 1 mol of ethylenically unsaturated groups in the monomer (I). The present invention provides a method for producing a fluorinated alkyl group-containing oligomer characterized by obtaining an alkyl group-containing oligomer.

  According to the present invention, a fluorinated alkyl group-containing oligomer can be obtained by a simple method without using a chain transfer agent, and the odor problem during production and storage and the performance during storage (surfactant activity) ) Can be obtained. This method has a wide range of selection of monomers used as a raw material, and can be designed in accordance with desired performance such as water-soluble to oil-soluble and the level of surface activity derived from the fluorine atom content. At the same time, it is easy to set the molecular weight in consideration of compatibility with the medium, and this is a technique with high industrial application value.

Hereinafter, the present invention will be described in detail.
In the present invention, a fluorinated alkyl group is one in which all hydrogen atoms in the alkyl group are substituted with fluorine atoms (perfluoroalkyl group), and a part of hydrogen atoms in the alkyl group are substituted with fluorine atoms. things [for example, - (CF ₂₎ 6 _H, etc.] is a generic name for a, it may be branched be linear. Further, those containing an oxygen atom in the fluorinated alkyl group (for example, —OCF ₂ CF ₂ (OCF (CF ₃ ) CF ₂ ) ₂ CF ₂ CF ₃ , — (OCF ₂ CF ₂ ) ₈ — etc.)) are also defined in this definition. Shall be included.

  The fluorinated alkyl group-containing ethylenically unsaturated monomer (A) used in the present invention can be used without limitation as long as it is a compound having a fluorinated alkyl group and an ethylenically unsaturated group. As the number of carbon atoms of the fluorinated alkyl group, the solvent used at the time of the polymerization reaction, the polymerization initiator (C) described later, and the compatibility with other monomers used later as necessary, and the resulting oligomer From the viewpoint of achieving both the solubility in various media such as solvents and resins in the material added when used as a surfactant and the surface active ability, it is usually from 1 to 20, and from 4 to 12 Particularly preferred is 6-8.

As the fluorinated alkyl group-containing ethylenically unsaturated monomer (A), the following general formula (1) can be used because the raw materials are easily available and the compatibility with other components is excellent.
CH ₂ = C (R ₁ ) COO (X) _a R _f (1)
(Wherein R ₁ is a hydrogen atom, a methyl group, a chlorine atom, a fluorine atom or a cyano group, X is a divalent linking group containing no fluorine atom, a is an integer of 0 or 1, R _f is a fluorinated alkyl group.)
It is preferable that it is a monomer represented by.

X in the general formula (1) is, for example, — (CH ₂ ) _n —, —CH ₂ CH (OH) (CH ₂ ) _n —, — (CH ₂ ) _n NR ₂ —SO ₂ —, — (CH ₂ ) _n NR ₂ —CO— (where n is an integer of 1 to 10 and R ₂ is a hydrogen atom or an alkyl group having 1 to 18 carbon atoms), —CH (CH ₃ ) —, _{-CH (CH 2 CH 3) -} , - C (CH 3) 2 - and the like. Further, Examples and _{R f} in the general formula (1), for _{example, -C 4 F 9, -C 7} F 15, -C 8 F 17, - (CF 2) 4 H, - (CF 2) 6 CF _{(CF 3) 2, - (} OCF 2 CF 2) 4 OCF 2 CF 3, - (OCF 2 CF (CF 3)) 3 C 3 F 7 and the like.

Specific examples of the compound represented by the general formula (1) include the following.
_{A-1: CH 2 = CHCOOCH} 2 CH 2 C 8 F 17
_{A-2: CH 2 = C} (CH 3) COOCH 2 CH 2 C 8 F 17
_{A-3: CH 2 = CHCOOCH} 2 CH 2 C 12 F 25
_{A-4: CH 2 = CHCOOCH} 2 CH 2 C 6 F 13
_{A-5: CH 2 = CHCOOCH} 2 CH 2 C 4 F 9
_{A-6: CH 2 = CFCOOCH} 2 CH 2 C 6 F 13
_{A-7: CH 2 = CHCOOCH} 2 CF 3
_{A-8: CH 2 = C} (CH 3) COOCH 2 CF (CF 3) 2
_{A-9: CH 2 = C} (CH 3) COOCH 2 CFHCF 3
_{A-10: CH 2 = CHCOOCH} 2 (CF 2) 6 H
_{A-11: CH 2 = CHCOOCH} 2 CH (OH) CH 2 C 8 F 17
_{A-12: CH 2 = CHCOOCH} 2 CH 2 N (C 3 H 7) SO 2 C 8 F 17
_{A-13: CH 2 = CHCOOCH} 2 CH 2 N (C 2 H 5) COC 7 F 15
_{A-14: CH 2 = CHCOOC} 2 H 4 (CF (CF 3) OCF 2) 3 C 2 F 5
_{A-15: CH 2 = CHCOOCH} 2 (CF (CF 3) OCF 2) 2 C 2 F 5
Needless to say, the present invention is not limited to these specific examples. Further, the fluorinated alkyl group-containing ethylenically unsaturated monomer (A) may be one kind or a mixture of two or more kinds of compounds having different structures.

  Since the fluorinated alkyl group, which is a fluorine-containing site in the oligomer obtained by the production method of the present invention, is present in the ethylenically unsaturated monomer used as the monomer, it is always located in the side chain portion. In addition, many of the monomers (A), for example, the compounds A-1 to A-15, can be used as a general-purpose organic solvent (for example, without using a halogen-based solvent such as chlorofluorocarbon or alternative chlorofluorocarbon. , Ketone solvents such as methyl isobutyl ketone, ester solvents such as ethyl acetate, alcohol solvents such as isopropyl alcohol, and aromatic solvents such as toluene). The oligomer obtained by polymerization is also soluble in the organic solvent. For this reason, an oligomer that can be used as a surfactant can be obtained without performing a complicated treatment as described in Patent Document 2, and the industrial application value is high.

  Next, the polymerization initiator (C) will be described. The polymerization initiator is selected according to the polymerization mechanism. Generally, the polymerization mechanism is defined by a solution polymerization method, a bulk polymerization method, a dispersion polymerization method, and an emulsion polymerization method based on anionic polymerization, cationic polymerization, and radical polymerization. There are no restrictions on the polymerization mechanism in the production method of the present invention, but the production conditions such as industrial polymerization temperature, the availability of raw material monomers, the target molecular weight (degree of polymerization), and easy application development of fluorinated alkyl group-containing oligomers Considering the properties, it is preferable to produce by radical solution polymerization. Therefore, it is preferable to use a radical polymerizable initiator that is soluble in the solvent as the polymerization initiator (C). Examples of such radical polymerizable initiators include photopolymerization initiators and thermal polymerization initiators. From the viewpoint of easy polymerization control in this production method, organic peroxides or azo compounds which are thermal polymerization initiators. It is preferable to use a compound. The organic peroxide or azo compound can be variously selected depending on the polymerization conditions, but considering the target molecular weight, polymerization temperature and controllability, polymerization time, etc., the 10-hour half-life temperature is 40 to 120 ° C. It is preferable that it is 60-100 degreeC. Specific compounds include Perhexa HC, Perhexa TMH, Perhexa C, Perhexa V, Perhexa 22, Peroxyketals such as Perhexa MC, Parroyl 355, Parroyl O, Parroyl L, Parroyl S, Niper BW, manufactured by Nippon Oil & Fats Co., Ltd. Diacyl peroxides such as Nyper BMT, peroxydicarbonates such as perloyl TCP, percyclo ND, perhexyl ND, perbutyl ND, perhexyl PV, perbutyl PV, perhexa 250, perocta O, perhexyl O, perbutyl O, perbutyl IB, perbutyl L, Peroxyesters such as perbutyl 535, perhexyl I, perbutyl I, perbutyl E, perhexa 25Z, perbutyl A, perhexyl Z, perbutyl ZT, perbutyl Z, 2, 2 -Azobisisobutyronitrile (for example, AIBN manufactured by Otsuka Chemical Co., Ltd.), 2,2'-azobis-2-methylbutyronitrile (for example, AMBN manufactured by Otsuka Chemical Co., Ltd.), 2,2'-azobis-2 -Dimethylvaleronitrile (for example, ADVN manufactured by Otsuka Chemical Co., Ltd.), dimethyl 2,2'-azobis (2-methylpropionate) (for example, V-601 manufactured by Wako Pure Chemical Industries, Ltd.), 1,1'- Azobis (cyclohexane-1-carbonitrile) (for example, V-40 manufactured by Wako Pure Chemical Industries, Ltd.), 2,2′-azobis- [N- (2-propenyl) -2-methylpropionamide] (for example, Japanese VF-096 manufactured by Kojun Pharmaceutical Co., Ltd., 1-[(cyano-1-methylethyl) azo] formamide (for example, V-30 manufactured by Wako Pure Chemical Industries, Ltd.), 2,2 ′ Azobis- (N-butyl-2-methylpropionamide) (for example, VAm-110 manufactured by Wako Pure Chemical Industries, Ltd.), 2,2′-azobis- (N-cyclohexyl-2-methylpropionamide) (for example, Japanese KOm Pharmaceutical Co., Ltd. VAm-111). Needless to say, the present invention is not limited to the above specific examples.

  In the production method of the present invention, since a large amount of the polymerization initiator (C) is used as described later, a large amount of initiator radicals are generated during the polymerization reaction. When an azo compound is used as the polymerization initiator (C), nitrogen is produced as a by-product when the initiator radical is generated, and impurities (recoupling compounds) that do not contribute to the polymerization reaction when a recoupling reaction between the initiator radicals occurs. A considerable amount will be produced as a by-product. Such a recoupling compound derived from a polymerization initiator may adversely affect the target performance such as solubility in a medium to which the fluorinated alkyl group-containing oligomer is added and surface activity depending on the use of the resulting fluorinated alkyl group-containing oligomer. There is a case. Considering this point, it is most preferable to use an organic peroxide having a 10-hour half-life temperature of 40 to 120 ° C. as the polymerization initiator (C).

  In selecting the polymerization initiator (C), the viewpoint of the structure design of the oligomer terminal is also important. In the production method of the present invention, since a large amount of the polymerization initiator (C) is used, the degree of polymerization of the resulting fluorinated alkyl group-containing oligomer is lowered, and many molecular chain terminals are present. At this time, the molecular chain terminal structure is often a structure derived from a polymerization initiator. Therefore, depending on the structure of the polymerization initiator (C), solubility of the resulting oligomer in the material system used, surface activity, etc. The polymerization initiator (C) will preferably have a low molecular weight, and the polymerization initiator will be selected in consideration of the desired performance, the selection of the monomers (I), etc. It is preferable to select (C).

In the production method of the present invention, the polymerization initiator (C) is used in an amount of 0.1 to 0.6 mol with respect to 1 mol of the ethylenically unsaturated group in the ethylenically unsaturated monomer (I) used as a raw material. it is necessary to, preferably especially in the range of 0.15 to 0.5 mol. The amount of the polymerization initiator (C) used in the production method of the present invention is large compared with the synthesis of conventional polymers. For this reason, various forms of low polymerization degree having a fluorinated alkyl group at the side chain site. Alternatively, a low molecular weight fluorinated alkyl group-containing oligomer can be easily synthesized. The obtained oligomer depends on the polymerization temperature, polymerization concentration, polymerization conditions such as a solvent, and selection of monomers (I), but the average degree of polymerization is usually 2 to 10, preferably 2 to 7. The number average molecular weight is about 500 to 5,000.

  The ethylenically unsaturated monomers (I) used as a raw material in the production method of the present invention are not limited in any way other than using the fluorinated alkyl group-containing ethylenically unsaturated monomer (A) described above. Instead, other monomers can be appropriately selected and used in combination depending on the intended use of the fluorinated alkyl group-containing oligomer obtained, the level of intended performance, and the like. In particular, since the fluorinated alkyl group in the monomer (A) becomes a hydrophobic group or an oleophobic group when the obtained oligomer is used as a surfactant, a surfactant such as water, an organic solvent, or a resin is used. In order to improve the compatibility with the medium to be added, it is preferable to copolymerize using a monomer having a philic group.

  The amount of the other monomer used in combination is not limited at all, and is appropriately selected depending on the purpose of use of the resulting oligomer. When used as a surfactant, fluorine is used. In order to sufficiently express the surface activity derived from atoms, it is preferable that the monomer (A) is contained in the range of 10 to 90% by weight in the monomers (I) used as a raw material. In particular, it is preferably contained in the range of 40 to 80% by weight.

  The other monomer can be used without particular limitation as long as it is copolymerizable with the monomer (A). For example, vinyl ethers such as styrene, butadiene, nucleus-substituted styrene, acrylonitrile, vinyl chloride, vinylidene chloride, vinyl pyridine, N-vinyl pyrrolidone, vinyl sulfonic acid, vinyl acetate, butyl vinyl ether, cyclohexyl vinyl ether, hydroxyl butyl vinyl ether, and α, β-ethylenically unsaturated carboxylic acid, that is, monovalent or divalent carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, α, β-ethylenically unsaturated carboxylic acid derivative (Meth) acrylic acid alkyl ester having 1 to 18 carbon atoms (hereinafter, this expression generically refers to both alkyl acrylate and alkyl methacrylate), that is, methyl and ethyl (meth) acrylic acid , Propyl, Cyl, octyl, 2-ethylhexyl, decyl, dodecyl, stearyl ester, etc., and (meth) acrylic acid hydroxyalkyl esters having 1 to 18 carbon atoms, that is, 2-hydroxyethyl ester, hydroxypropyl ester, hydroxybutyl ester, etc. Examples thereof include mono (acryloyloxyethyl) acid phosphate, mono (methacryloxyethyl) acid phosphate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate and the like.

  In addition, aminoalkyl esters of 1 to 18 carbon atoms of (meth) acrylic acid, that is, dimethylaminoethyl ester, diethylaminoethyl ester, diethylaminopropyl ester, etc., and (meth) acrylic acid alkyl ether containing 3 to 18 carbon atoms Esters such as methoxyethyl ester, ethoxyethyl ester, methoxypropyl ester, methyl carbyl ester, ethyl carbyl ester, butyl carbyl ester and the like, and cyclic structure-containing monomers include, for example, dicyclopentanyloxyl ethyl (meth) acrylate, Nyloxylethyl (meth) acrylate, isobornyl (meth) acrylate, adamantyl (meth) acrylate, dimethyladamantyl (meth) acrylate, dicyclopentanyl (meth) ) Acrylates, dicyclopentenyl (meth) acrylates, etc., and alkyl vinyl ethers having 1 to 18 alkyl carbon atoms such as methyl vinyl ether, propyl vinyl ether, dodecyl vinyl ether, glycidyl esters of (meth) acrylic acid, that is, glycidyl methacrylate, glycidyl acrylate Etc., and Kyoeisha Chemical Co., Ltd. HOA-MS, HOA-MPL, HOA-MPE, HOA-HH, Toa Gosei Co., Ltd. Aronix M-5300, M-5400, M-5500, M-5600, M-5700 And other commercially available products. Needless to say, the present invention is not limited to these specific examples. The ethylenically unsaturated group in the other monomer may be monofunctional having only one or polyfunctional having two or more. Further, the other monomer may be one type, or two or more types may be used simultaneously. Furthermore, these monomers can be used as they are, but they are used after pretreatment such as distillation purification, solvent washing, recrystallization, various adsorbents, column purification, etc. before production. It doesn't matter.

When the obtained oligomer is used as a surfactant, when the compatibility with the medium to be added, particularly the compatibility with the resin, is improved, the philic group in the oligomer has a functional group having two or more repeating units or A block oligomer or a graft oligomer containing a segment is preferable. From such a point, the ethylenic compound which is a macromonomer having a polyoxyalkylene structure, wherein the monomer (I) used as a raw material contains a functional group or segment having a repeating unit having two or more repeating units. containing unsaturated monomer (B). When the ethylenically unsaturated monomer (B) which is a macromonomer having a polyoxyalkylene structure is used, a fluorinated alkyl group-containing graft oligomer can be easily produced.

  The oligomer obtained by the present invention becomes a polymer having a low degree of polymerization with few main chain repeating units by using a large amount of the polymerization initiator (C). Therefore, when a high molecular weight (high polymerization degree) macromonomer is used as the monomer (B), a comb oligomer having a side chain portion longer than the main chain portion is obtained. That is, according to the production method of the present invention, various types of comb oligomers can be easily produced by selecting the macromonomer and the polymerization initiator (C) to be used in combination and further selecting the polymerization conditions.

According to the knowledge of the present inventors, the monomer (B) is an ethylenically unsaturated monomer having a polyoxyalkylene structure from the viewpoint of improving compatibility with resins and solvents and improving surface activity. Ru Oh in-mer. The polyoxyalkylene structure includes a polyoxyethylene chain, a polyoxypropylene chain, a polyoxybutylene chain, a polyoxyethylene-polyoxypropylene block copolymer, and a polyoxypropylene-polyoxybutylene block copolymer. Examples of the structure include those in which the ends of polyoxyethylene chains and polyoxypropylene chains are capped with alkyl groups having 1 to 18 carbon atoms. Specific compounds include NK esters M-20G, M-40G, M-90G, M-230G, M-450G, AM-90G, 1G, 2G, 3G, 4G, manufactured by Shin-Nakamura Chemical Co., Ltd. 9G, 14G, 23G, 9PG, A-200, A-400, A-600, APG-400, APG-700, Nippon Oil & Fats Co., Ltd. Bremer PE-90, PE-200, PE-350, PME- 100, PME-200, PME-400, PME-4000, PP-1000, PP-500, PP-800, 70FEP-350B, 55PET-800, 50POEP-800B, NKH-5050, PDE-50, PDE-100, PDE-150, PDE-200, PDE-400, PDE-600, AP-400, AE-350, ADE-200, ADE 400, and the like. Needless to say, the present invention is not limited to the above specific examples.

  In the method for producing a fluorinated alkyl group-containing oligomer of the present invention, in addition to the type and amount of polymerization initiator (C), the solvent, polymerization temperature, polymerization concentration, monomers (I) and polymerization initiator (C The degree of polymerization or the molecular weight of the resulting oligomer also varies depending on the injection method. In the present invention, there are no restrictions on these various conditions, the degree of polymerization or molecular weight of the target oligomer, and the performance associated therewith, the amount of polymerization initiator (C) used, the composition and properties of the monomers (I). It is preferable to select as appropriate.

  In carrying out the polymerization reaction, it is not always necessary to use a solvent, but it is preferably carried out in the presence of a solvent from the viewpoints of workability, ease of control of heat generation accompanying the polymerization reaction, and safety. Examples of the solvent include water, alcohols such as methanol, ethanol, isopropyl alcohol, and n-butanol, ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, esters such as methyl acetate, ethyl acetate, and butyl acetate, dimethylformamide, Polar solvents such as dimethyl sulfoxide, halogen solvents such as 1,1,1-trichloroethane and chloroform, ethers such as tetrahydrofuran and dioxane, aromatics such as benzene, toluene and xylene, and further perfluorooctane and perfluorotri Any of the fluorinated inerts such as -n-butylamine can be used. The solvent may be a single solvent or a mixed solvent of two or more kinds.

  Depending on the combination of the monomers (I) and the solvent, the molecular weight of the fluorinated alkyl group-containing oligomer that can cause a chain transfer reaction to the solvent may be affected. For example, when the monomer (I) contains a (meth) acrylic monomer, ketones such as methyl ethyl ketone and methyl isobutyl ketone hardly cause a chain transfer reaction, but alcohols such as isopropyl alcohol cause a chain transfer reaction. It is easy to cause. In the production method of the present invention, it is possible to select a wide range of solvents depending on the combination of the monomers (I) and the solvent. Therefore, in some cases, the molecular weight can be reduced by utilizing a chain transfer reaction to the solvent. It is also possible to adjust.

  There is no limitation on the method of injecting the monomers (I) and the polymerization initiator (C) into the solvent, but since a large amount of the polymerization initiator (C) is used, the polymerization reaction is controlled and the safety point is increased. It is preferable to inject while dropping. As the method of dropping, the monomers (I), the combination of the polymerization initiator (C) and the solvent, the target polymerization degree or molecular weight, safety, etc. are taken into consideration, the monomers (I), the polymerization start A dripping liquid composed of any combination of the agent (C) and the solvent is prepared. The dropping liquid composed of any combination of the monomers (I), the polymerization initiator (C), and the solvent is used as necessary for the monomers (I), the polymerization initiator (C). It is determined in consideration of compatibility with the solvent to be used. In general, when preparing a solution containing a fluorine-containing compound, the type and concentration may be restricted. Such restrictions may affect the design of the degree of polymerization or molecular weight of the resulting oligomer, or may be subject to restrictions on the production equipment. However, the monomers (I) used in the present invention, polymerization initiation Agent (C) not only has a combination that can be used to prepare a dropping solution without a solvent, but each of them is soluble in a wide range of solvents, so the degree of polymerization or molecular weight design and production equipment are affected. It is possible to prepare an optimal dripping solution without affecting the above.

  Further, depending on the production conditions, as a dropping solution, a high concentration fluorinated alkyl group-containing ethylenically unsaturated monomer (A) and solvent mixture, monomers (I), monomers (I) and solvent And a mixture of monomers (I) and a polymerization initiator (C), a mixture of monomers (I), a polymerization initiator (C) and a solvent, and the like. Even in such a case, many fluorinated alkyl group-containing ethylenically unsaturated monomers (A) depend on other monomers used in combination, a polymerization initiator (C), and a combination with a solvent. It is possible to obtain a homogeneous solution or dispersion. It is important for the dropping liquid to be homogeneous or dispersed in order to allow the copolymerization reaction to proceed more uniformly. This may affect the application characteristics of the resulting fluorinated alkyl group-containing oligomer (for example, solubility in a solvent or resin solution, surface active ability). Usually, a homogeneous copolymer is preferable, and a dropping solution is also used. Homogeneity is preferred. The homogeneity or dispersibility of the dropping liquid strongly depends on the above-described fluorinated alkyl group chain length and fluorine atom content. In the present invention, since the homogeneity or dispersibility of the dropping liquid can be maintained in a wide range, there is an advantage that an allowable range of polymerization conditions is widened and an oligomer can be designed rationally and efficiently.

  Furthermore, since the degree of polymerization becomes low, for example, a compound in which a polymerization initiator segment is added to both ends of the monomer may be generated. Depending on the intended performance, these may become impurities and adversely affect, but conversely, they may be a mixture of a plurality of molecules having a similar structure, and the compatibility and the like may be improved. Such a mixture can be handled according to the application and purpose. That is, it may be used as it is, and if necessary, components other than the fluorinated alkyl group-containing oligomer may be extracted with a solvent, washed, removed with an adsorbent, or purified with various columns or chromatography. Is possible.

  There are no restrictions on the use of the fluorinated alkyl group-containing oligomer thus obtained. For example, surfactants, surface modifiers, mold release agents, antistatic agents, foaming agents, antifoaming agents, fluidity adjustments It can be used as a molding aid such as a compatibilizer and a dispersant. In particular, as a surfactant, although it is a molecule having a high fluorine content that can be expected to have a high surface-active effect, it can be used for various applications because it can be produced with a high solubility in a solvent and a resin. When used as a surfactant, the amount of addition varies depending on the application and purpose, but in the composition to be prepared, it is usually 0.001 to 5% by weight, preferably 0.01 to 3% by weight, particularly preferably 0.00. 05 to 1% by weight. By using the fluorinated alkyl group-containing oligomer obtained in the present invention as a surfactant, it is possible to obtain effects such as wettability, leveling, foaming, defoaming, penetrability, wettability, and detergency. It is. Specific examples of such surfactants include foam extinguishing agents, automobiles, home appliances, OA equipment, various paints for electronic and electrical equipment and parts, various printing inks, inkjet inks, PS plate photosensitive liquids, semiconductors, and the like. Photoresist for flat panel display, color resist, anti-reflective coating, developer, etching solution, rinse solution, stripper, etc., photographic material such as emulsion, developer, olefin resin such as polyethylene and polypropylene, acrylic resin , Polystyrene, polyurethane, polyester, polycarbonate, triacetyl cellulose, polyvinyl chloride, ABS resin, phenol resin, epoxy resin, polyimide, PPS and other engineering plastics, polytetrafluoroethylene, vinylidene fluoride and other fluorine-based resins, NBR, S R, EPDM, silicone-based and fluorine-based rubber materials, paper, metal, glass, ceramics, etc., and in some cases, colorants such as organic and inorganic pigments, dyes, carbon, silica, titanium oxide, zinc oxide, Inorganic powders such as aluminum oxide, zirconium oxide, calcium oxide, calcium carbonate, organic fine powders such as higher fatty acids, poly (vinylidene fluoride), poly (tetrafluoroethylene), polyethylene, light resistance improver, weather resistance improver Sheets, films, plates, tubes, rolls, belts, molds made of various fillers such as antioxidants, heat stabilizers, gloss modifiers, antistatic agents, conductivity modifiers, Primer coating materials, intermediate coating materials, surface (top) coating materials and the like for yarns, fibers, and the like. Such coating materials are solvent-free, water-based, organic solvent-based depending on the form of the solution, thermoplastic resin, thermosetting resin depending on the type of resin, thermosetting depending on the curing method, energy ray curable such as UV, etc. Although fractionated, the fluorinated alkyl group-containing oligomers obtained in the present invention can be applied to any of various types of coating materials. Moreover, the coating method of the coating material is selected according to the application and purpose, such as gravure coater, knife coater, dipping coating, spray coating, spin coater, slit & spin coater, slit coater, roll coater, curtain coater, flow coater, It can apply | coat on various base materials by methods, such as brush coating. The fluorinated alkyl group-containing oligomer obtained in the present invention has a surface-active effect particularly when the target film thickness is thin (5 μm or less), further when the coating area is large with a thin film, or when high shearing force or high-speed coating is applied. Becomes prominent.

  Next, reference examples, examples, and comparative examples will be listed in order to describe the present invention in more detail, but it goes without saying that the present invention is not limited in any way by these descriptions. “Parts” in the text are based on weight unless otherwise specified.

Example 1
A glass flask equipped with a stirrer, a condenser, a thermometer, and a dropping funnel is charged with 250 g of methyl isobutyl ketone as a polymerization solvent. On the other hand, 40 g (0.0957 mol) of A-4 as the fluorinated alkyl group-containing ethylenically unsaturated monomer (A), and an average degree of polymerization of 4 as the ethylenically unsaturated monomer (B) other than (A) 40 g (0.1481 mol) of 5 mol polyethylene oxide chain-containing acrylate (Nippon Yushi Co., Ltd., Bremermer AE-200), 20 g (0.1724 mol) of 2-hydroxyethyl acrylate, polymerization initiator (C) 20 g (0.0926 mol) of t-butylperoxy-2-ethylhexanoate (Nippon Yushi Co., Ltd. perbutyl O, hereinafter abbreviated as perbutyl O. 10 hour half-life temperature; 72.1 ° C.) and methyl isobutyl ketone 50 parts by weight are mixed in advance and dissolved uniformly, and charged into a dropping funnel to prepare a dropping solution.

  The dropping funnel charged with the dropping liquid is set in a glass flask and heated to 110 ° C. while injecting nitrogen gas. When the temperature reaches 110 ° C., the dropping solution is dropped in a constant amount over 6 hours. Thereafter, the mixture was held for 12 hours to complete the polymerization, and a fluorine-containing oligomer (1) was obtained as a MIBK solution. Although this polymerization solution had a MIBK odor, a viscous liquid (referred to as oligomer 1) was obtained when de-MIBK was performed, and was almost odorless.

  The number average molecular weight in terms of polystyrene by gel permeation chromatography (hereinafter abbreviated as GPC) of oligomer 1 is Mn = 1,160, and the average degree of polymerization calculated from the monomer and polymerization initiator composition is 3. .2.

  The 1% aqueous solution of oligomer 1 was a transparent liquid. The surface tension of the 0.1 wt% aqueous solution of oligomer 1 measured by the Wilhelmy method was 19.5 mN / m, indicating an excellent surface tension reducing ability at a low concentration. The average degree of polymerization was calculated on the assumption that the chain transfer reaction to the solvent did not occur and the polymerization initiator segment was always located at the oligomer end.

Example 2
Polyethylene oxide chain-containing methacrylate (Shin Nakamura Chemical Co., Ltd.) having 40 g (0.0957 mol) of A-4, an average polymerization degree of 9 mol and a terminal methoxy group as the monomer composition in the dropping liquid in Example 1. A polymerization reaction was carried out in the same manner as in Example 1 except that 60 g (0.1210 mol) of NK ester M-90G (manufactured) was changed to obtain a nearly odorless fluorine-containing oligomer (referred to as oligomer 2). The number average molecular weight of the oligomer 2 was Mn = 1,400 and the average degree of polymerization was 2.5. The 1% aqueous solution of oligomer 2 was a slightly turbid dispersion without precipitation. The surface tension of the 0.1 wt% aqueous solution of oligomer 2 measured by the Wilhelmy method was 20.8 mN / m, indicating an excellent surface tension reducing ability at a low concentration.

Example 3
As for the monomer composition in the dropping liquid in Example 1, 60 g (0.0965 mol) of A-1 and polypropylene oxide chain-containing methacrylate having an average polymerization degree of 5 mol (Blenmer PP-1000 manufactured by NOF Corporation, hereinafter PP) -1000.) The polymerization reaction was carried out in the same manner as in Example 1 except that 40 g (0.1064 mol) and perbutyl O was 7.5 g (0.0347 mol), and an almost odorless fluorine-containing oligomer (oligomer). 3) was obtained. The number average molecular weight of the oligomer 3 was Mn = 2,100, and the average degree of polymerization was 4.7. The 1% IPA solution and 1% propylene glycol monomethyl ether (PGME) solution of oligomer 3 were clear liquids. The surface tension of the oligomer 3 in a 0.1% PGME solution measured by the Wilhelmy method was 17.7 mN / m, indicating an excellent ability to lower the surface tension at a low concentration.

Example 4
Dimethyl 2,2′-azobis (2-methylpropionate) (V-601 manufactured by Wako Pure Chemical Industries, Ltd., 10 hour half-life temperature: 66 ° C.) as a polymerization initiator (C) in the dropping liquid in Example 1 The polymerization reaction was carried out in the same manner as in Example 1 except that the amount was changed to 20 g (0.087 mol) to obtain a substantially odorless fluorine-containing oligomer (referred to as oligomer 4). The number average molecular weight of the oligomer 4 was Mn = 910, and the average degree of polymerization was 2.3. The 1% aqueous solution of oligomer 4 was a transparent liquid. The surface tension of the 0.1 wt% aqueous solution of oligomer 4 measured by the Wilhelmy method was 19.7 mN / m, indicating an excellent ability to lower the surface tension at a low concentration.

Comparative Example 1
The polymerization reaction was carried out in the same manner as in Example 1 except that 2 g (0.0093 mol) of perbutyl O in the dropping liquid in Example 1 was used, and the polymerization temperature was 80 ° C., and an almost odorless fluorine-containing oligomer (Oligomer 5). Got. The number average molecular weight of the oligomer 5 was Mn = 6,100, and the average degree of polymerization was 19.7. The 1% aqueous solution of oligomer 5 became cloudy.

Comparative Example 2
A polymerization reaction was performed in the same manner as in Example 1 except that 2 g (0.0093 mol) of perbutyl O in the dropping liquid in Example 1 and 3 g (0.0149 mol) of n-lauryl mercaptan as a chain transfer agent were used. A fluorine-containing oligomer (oligomer 6) was obtained. Oligomer 6 had a strong specific odor derived from n-lauryl mercaptan. The number average molecular weight of the oligomer 6 was Mn = 960, and the average degree of polymerization was 2.5.

Comparative Example 3
The polymerization reaction was carried out in the same manner as in Example 1 except that 3 g (0.0139 mol) of perbutyl O in the dropping liquid in Example 3 was used and the polymerization temperature was 80 ° C. ) The number average molecular weight of the oligomer 7 was Mn = 8,400, and the average degree of polymerization was 20.4. Oligomer 7 did not dissolve in 1% IPA solution and 1% propylene glycol monomethyl ether solution.

Claims (3)

  Ethylenically unsaturated monomers (I) containing a fluorinated alkyl group-containing ethylenically unsaturated monomer (A) and an ethylenically unsaturated monomer (B) which is a macromonomer having a polyoxyalkylene structure The monomer (I) is polymerized using 0.1 to 0.6 mol of a polymerization initiator (C) with respect to 1 mol of ethylenically unsaturated groups therein to obtain a fluorinated alkyl group-containing oligomer. A method for producing a fluorinated alkyl group-containing oligomer.   The method for producing a fluorinated alkyl group-containing oligomer according to claim 1, wherein the polymerization initiator (C) is an organic peroxide (c1) having a 10-hour half-life temperature of 40 to 120 ° C. Ethylenically unsaturated monomers (I) containing a fluorinated alkyl group-containing ethylenically unsaturated monomer (A) and an ethylenically unsaturated monomer (B) which is a macromonomer having a polyoxyalkylene structure ethylenically the unsaturated groups to 1 mole, the polymerization initiator (C) to 0.15-0.5 mols claim 1 method for producing a fluorinated alkyl group-containing oligomer described in.