JPH04122762A - Composition for rubberlike film - Google Patents

Abstract

PURPOSE:To easily prepare the title compsn. giving a film excellent in flexibility, toughness, and hand with a thickness similar to that of a plastic film by compounding a polyoctenylene resin with a specific copolymer. CONSTITUTION:A polyoctenylene resin is compounded with a styrene-butadiene copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rubber-like film that is relatively inexpensive, extremely flexible and has a good texture, and a resin composition suitable for producing the same.

(Prior Art and Problems) Conventionally, rubber-like substances have been favored for their flexibility, toughness, and good texture, and have been used in a very wide range of products such as various industrial material parts and household goods. However, in order to maintain its mechanical strength, it must undergo a vulcanization process, which limits processing methods and prevents it from being made into a film. However, there are many demands for films with the unique texture of rubber, and for this reason, rubber latex casting films are produced, but because they have not gone through a vulcanization process, they have poor mechanical strength and residual distortion. In addition, there are many points that need to be improved, and since it is a casting method, it has poor moldability and is relatively expensive.

On the other hand, in the rubber industry, vulcanized rubber sheets are manufactured by the calendar method, and although the texture and mechanical strength of these sheets are satisfactory, the thickness of these sheets is at most about 11 mm, and thinner film-like sheets are being produced. Something was desired.

The present inventors have arrived at the present invention as a result of intensive studies aimed at inexpensively mass-producing a rubber-like film that has the same thickness as a rubber latex film and has the same feel and mechanical strength as a rubber sheet.

(Means for Solving the Problems) That is, the present invention provides a rubbery film composition formed by blending a styrene-butadiene copolymer with a polyoctenylene resin, and a rubbery film formed from this composition.

The polyoctenylene resin used in the present invention is made by polymerizing cyclooctene, has one double bond per 8 carbon atoms, has a molecular weight of 10,000 or more, and has a trans content of 50%. Above, it is preferably 60% or more, and the crystallinity is preferably in the range of 10% or more. Further, this polyoctenylene resin usually has a melting point of 40°C or higher, preferably in the range of 50°C to 60°C, and a glass transition point of preferably in the range of -75°C to -30°C.

Various methods can be adopted to synthesize cyclooctene, which is the base material constituting this polyoctenylene resin, but for example, after trimerizing butadiene, one of the remaining two double bonds is hydrogenated. It can be obtained by

Although the polyoctenylene resin used in the present invention has sufficiently good physical properties as it is, it may contain substances known as vulcanizing agents and vulcanization accelerators such as peroxides, phenolic resins, and sulfur compounds, as well as carbosic acid and its like. It is more preferable to melt mix or add and mix the acid anhydride.

The styrene-butadiene copolymer in the present invention is obtained by blending a styrene monomer and a butadiene monomer in predetermined amounts and post-polymerizing the mixture. Various polymerization methods can be used to polymerize these monomers, such as radical polymerization and living anion polymerization, and the copolymers obtained by these polymerization methods also have different structures, such as random copolymers and block copolymers. However, all of these can be used as components of the rubbery film composition of the present invention. Furthermore, the obtained styrene-
A butadiene copolymer obtained by hydrogenating some or all of the carbon-carbon double bonds in the butadiene segment can also be preferably used.

The rubbery film composition of the present invention requires dyes and pigments, various stabilizers, fillers, plasticizers, antioxidants, ultraviolet absorbers, nucleating agents, antistatic agents, flame retardants, thickeners, etc. You can also add it depending on your needs.

As a method for mixing the polyoctenylene resin and styrene-butadiene copolymer in the present invention, various conventionally known kneading machines can be used. For example, you can use a rubber roll, or use a pressure kneader for rubber with polyoctenylene resin.
A styrene-butadiene copolymer, a vulcanizing agent, various additives, and the like may be charged at the same time and melt-kneaded. Alternatively, these raw materials may be triblended in advance and then melt-kneaded using an extruder for plastics.

The rubbery film composition of the present invention is then formed into a film by various methods conventionally known in the plastics industry. Examples include the T-die method and the inflation method.

Furthermore, various rubbers or plastics may be added for the purpose of improving various physical properties of the rubbery film composition of the present invention. These can be added by blending them into the polyoctenylene resin in advance, or by tri-blending them into the polyoctenylene resin, styrene-butadiene copolymer, vulcanizing agent, various additives, etc., and then melt-kneading them at the same time. You may.

(Effects of the Invention) The rubbery film obtained from the rubbery film composition of the present invention has the flexibility, toughness, and texture that are inherent to rubber, and has the same thickness as ordinary plastic films. There is. Furthermore, since this rubbery film composition can be easily formed into a film using a common plastic film molding machine, it can be manufactured in large quantities at low cost.

Furthermore, this rubber-like film has low residual strain characteristics similar to those of vulcanized rubber, and hot-melt adhesive properties derived from polyoctenylene resin, so it is superior in terms of performance and price compared to ordinary plastic films. It is fully counterable.

(Example) Next, the present invention will be specifically explained using examples.

Example 1 Polyoctenylene resin (VESTENAM manufactured by Hils)
ER8012) and a styrene-butadiene block copolymer (Califlex TR1102 manufactured by Shell Chemical Co., Ltd.) in the amounts shown in Table 1 were blended, and after melt-kneading in a conventional extruder, they were pelletized. Using this pellet, a film with a thickness of 100 μm was molded using a conventional T-die extruder. This film was flexible and had a good texture. Note that Table 1 shows the results of measuring the residual strain of this film in accordance with JIS K6301.

Example 2 Polyoctenylene resin (VESTENA manufactured by Hils)
MER8012) and styrene-butadiene copolymer (
Clayton G1652 (manufactured by Shell Chemical Co., Ltd.) was blended in the amounts shown in Table 1, and the mixture was melt-kneaded using a conventional extruder and then pelletized. Using this pellet, the thickness was 50 mm using the inflation method.
A μm film was molded. This film was flexible and had a good texture. This film was adhered with a hot melt sealer, and the adhesive strength was measured according to J15K6850. The results are shown in Table 1.

Example 3 In Example 2, in addition to polyoctenylene resin, Kraton 01652, polypropylene resin (H
Example 2 except that 3O1) was added in the amount shown in Table 1.
A film was formed in exactly the same manner as above, and its adhesive strength was measured. The results are shown in Table 1.

Example 4 Polyoctenylene resin (VESTENA manufactured by Hils)
MER8012) and styrene-butadiene copolymer (
Aron Kasei Co., Ltd. AR750) was blended in the amount shown in Table 1, and after melt-kneading with a normal extruder, it was pelletized. Using this pellet, a film with a thickness of 50 μm was formed by an inflation method. This film was flexible and had a good texture. This film was adhered with a hot melt sealer, and the adhesive strength was measured according to JIS K6850. Table 1 shows the results.

Example 5 Example 4 was completely the same as Example 4 except that in addition to polyoctenylene resin 1 and styrene-butadiene copolymer (AR750 manufactured by Aron Kasei Co., Ltd.), dimethylolphenol resin (5P1045) was added as shown in Table 1. A film was formed in the same manner and its adhesive strength was measured. -The results are shown in Table 1.

Comparative Example 1 Film molding was attempted in exactly the same manner as in Example 1 except that polyoctenylene resin was not blended. With this product, it was not possible to obtain a stable and good film due to uneven discharge due to the T-die.

Comparative Example 2 A film was formed in exactly the same manner as in Example 2, except that the styrene-butadiene copolymer (Krayton G1652) was not blended.

This film felt more like plastic than rubber. Table 1 shows the results of measuring the residual strain and adhesive strength of this film.

Comparative Example 3 In Example 2, film molding was carried out in exactly the same manner as in Example 2 except that the polyoctenylene resin was not blended, but the discharge from the inflation die was unstable and a good film could not be obtained.

Comparative Example 4 In Example 4, a film was formed in exactly the same manner as in Example 4 except that no polyoctenylene resin was blended. However, the discharge from the inflation die was unstable and a good film could not be obtained.

(Margin below)

Claims (2)

[Claims] (1) A rubbery film composition formed by blending a styrene-butadiene copolymer with a polyoctenylene resin. (2) A rubber-like film comprising the resin composition according to claim 1.