JP2836850B2 - Orthopedic casting tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to impregnating a polyurethane resin composition into a base fabric,
The present invention relates to an orthopedic casting tape for fixing and treating an affected part in the field of surgery and orthopedic surgery.

[Conventional technology]

As an alternative to gypsum bandage impregnated with gypsum with gypsum, a casting tape coated with polyurethane resin on a base cloth made of glass fiber or other material is wrapped around the affected area, and the polyurethane resin is cured by reacting with moisture. It is already known that hydraulic casting tapes have various advantages over cast bandages using calcined gypsum. As the polyurethane resin composition used for this hydraulic casting tape, a polyurethane prepolymer comprising aromatic polyisocyanate and polyol containing dimorpholinodiethyl ether as a catalyst has a curing time and storage stability that are practically satisfactory. (JP-A-58-146351). However, this polyurethane resin composition,
Since the resin has extremely strong adhesiveness until it cures, the resin sticks to the gloves worn by the practitioner, making it extremely difficult to perform the procedure, and while spending time, the resin begins to cure, appropriate casting, It has the disadvantage of not being able to model.

As a method of reducing the tackiness of this resin and obtaining a resin composition having almost no wet tackiness, it is proposed to include a lubricant in the hydraulic resin and to reduce the dynamic friction coefficient of the surface of the casting tape to less than 1.2. (Japanese Unexamined Patent Publication No. Sho 62)
-87162). When this resin composition is used, since the adhesiveness is almost eliminated, the winding difficulty due to the above-mentioned adhesion is eliminated, but on the contrary, since there is no adhesiveness, the interlayer adhesion is weak, peeling is easily caused, and it is extremely slippery. Therefore, there is a problem that it is difficult for the practitioner to slip the hand to drop the casting tape or to apply an appropriate tension to the tape.

[Problems to be solved by the invention]

In view of the above-mentioned problems of the conventional casting tape, an object of the present invention is to provide a molding that has no adhesiveness when wet, has an appropriate interlayer adhesion strength, and does not slip a hand during a treatment. The object is to obtain a surgical casting tape.

[Means for solving the problem]

In order to achieve the above object, the polyurethane resin composition of the present invention comprises a urethane prepolymer composed of a polyol and a polyisocyanate, a catalyst having excellent storage stability, a stabilizer, and an ester compound of polyethylene glycol.

As the polyol used in the present invention, a usual polyol can be used. For example, alkylene oxides (ethylene oxide, propylene oxide, etc.) are converted to low molecular weight polyols (ethylene glycol, propylene glycol, butylene glycol, glycerin, trimethylolpropane, triethanolamine, pentaerythritol, sorbitol, etc.) and polyamines (ethylenediamine,
Polyether polyols having a structure added to diethylene triamine, tolylene diamine, etc.), polycarboxylic acids (succinic acid, maleic acid, sebacic acid, adipic acid, fumaric acid, phthalic acid, dimer acid, etc.) and the above low molecular polyols And the like. These polyols can be used alone or
A mixture of more than one species can be used.

Of these, polyether polyols which are alkylene oxide adducts of low molecular weight polyols are preferred. Particularly preferred are polypropylene ether diols and triols, having an average molecular weight of 200 to 2,000, preferably 400 to 1,000.

As the polyisocyanate used in the present invention, an ordinary polyisocyanate can be used. Of these, aromatic polyisocyanates are preferred. For example, 2,4
-Toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate (hereinafter abbreviated as MDI) 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate,
And carbodiimide-modified polyisocyanates. These polyisocyanates can be used alone or in combination of two or more. Particularly preferred is MDI or a partial carbodiimide modification of MDI.

The ratio of the polyol to the polyisocyanate is usually 2 to 5 equivalents, preferably 2.5 to 4 equivalents of the polyisocyanate per equivalent of the polyol.

The urethane prepolymer is obtained by heating and stirring a polyol and a polyisocyanate at usually 30 to 120 ° C, preferably 50 to 100 ° C.

Examples of the catalyst having excellent storage stability in the present invention include bis (N, N-dimethylaminoethyl) ether, bis (4-morpholinoethyl) ether, bis (4- (2,
6- (dimethylmorpholino) ethyl) ether and the like. These catalysts can be used alone or in combination of two or more.

The amount of the catalyst to be used is generally 0.05 to 10 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the urethane prepolymer.

Examples of the stabilizer of the present invention include acid chlorides such as benzoyl chloride and sulfonic acids such as methanesulfonic acid. These stabilizers can be used alone or in combination of two or more.

The amount of the stabilizer used depends on the type of the stabilizer and the type of the catalyst, but usually 1 to 30 parts by weight relative to 100 parts by weight of the catalyst,
Preferably it is 1 to 10 parts by weight.

The polyethylene glycol (hereinafter abbreviated as PEG) ester compound of the present invention is a fatty acid ester compound of PEG having a molecular weight of 1,000 to 50,000 and having 10 to 30 carbon atoms, and may be a monoester compound or a diester compound, but a diester compound is particularly preferred. Ester compound is PEG and carbon number 10-30
Is obtained by heating and esterifying the fatty acid in the presence of an acid catalyst.

PEG is 100% ethylene oxide in ethylene glycol
Obtained by adding at ~ 200 ° C.

Examples of the fatty acids having 10 to 30 carbon atoms include saturated fatty acids (such as octylic acid and stearic acid) and unsaturated fatty acids (such as oleic acid and linoleic acid). These fatty acids can be used alone or in combination of two or more.

The amount of the PEG ester compound to be used is generally 2 to 10 parts by weight, preferably 3 to 8 parts by weight, based on 100 parts by weight of the urethane prepolymer.

In the present invention, an antifoaming agent, an antioxidant, and a coloring agent (pigment, dye) may be used.

The polyurethane resin composition of the present invention may be added with a catalyst, a stabilizer, an ester compound of PEG, an antifoaming agent, an antioxidant to the urethane prepolymer, or a catalyst and a stabilizer in advance when producing the urethane prepolymer. , An ester compound of PEG, an antifoaming agent, and an antioxidant.

The polyurethane resin composition of the present invention may be applied to a base fabric of an orthopedic casting tape by a conventionally known method, for example, by a roll.

[Action]

The polyurethane resin composition of the present invention is used as an orthopedic casting tape by impregnating a base cloth,
By immersing this in water, the viscous urethane prepolymer reacts with water to become a polymer and becomes a rigid resin,
It hardens integrally with the base cloth between the layers of the wound tape to generate a fixing force for the affected part.

The catalyst has the function of regulating the rate at which the urethane prepolymer reacts with water.The urethane prepolymer does not cure during the time required to wind the tape around the affected area, and has flexibility. The time from the start of the reaction to the hardening is adjusted so that the hardening can be quickly performed to a strength at which the can be fixed.

The stabilizer has a function of suppressing self-curing of the urethane prepolymer. Urethane prepolymer is moisture other than water,
Since it has the property of undergoing a self-reaction under the influence of oxygen or the like and being hardened, the self-hardening reaction is suppressed by a stabilizer, and the storage stability from the time the tape is manufactured to the time it is used in a hospital is enhanced.

PEG ester compounds reduce the tackiness of the urethane prepolymer. Urethane prepolymers are hydrophobic and very sticky to gloves worn by practitioners when working with orthopedic casting tapes. The PEG ester compound is hydrophilic, and is activated particularly when it comes into contact with water, causing slimming, reducing the adhesiveness to rubber gloves and polyethylene gloves, and improving operability. On the other hand, PEG ester compounds are highly compatible with urethane prepolymers,
In addition, when the base cloth is immersed in water, the water adhering to the surface of the PEG ester compound is consumed by the reaction of the urethane prepolymer, and when the amount of water decreases, the hydrophilic activity of the PEG ester compound decreases, and the cured shaping is performed. Sufficient interlayer adhesive strength is obtained without affecting the adhesive strength between the layers of the surgical casting tape.

〔Example〕

 Hereinafter, the present invention will be described with reference to examples.

25,000 CPS viscosity from polyisocyanate and polyol
The urethane prepolymer was prepared and Irganox 1010 was added to 2472 g of this urethane prepolymer as an antioxidant.
2.6 g (Ciba-Geigy) and NIAX A-1 as a catalyst
(UCC) 49g, benzoyl chloride as stabilizer
By mixing 4.9 g, a base polyurethane composition was prepared. The PEG 4000 distearate was added to the base polyurethane composition in the following amounts, and four examples and two comparative examples were prepared. Further, another comparative example containing no PEG 4000 distearate was prepared.

Each polyurethane resin composition density vertical fourteen in a nitrogen gas atmosphere / inch above the horizontal fifteen / inch, the resin coating amount warp knit tape made of glass fibers having a basis weight 310 g / m ² is 210g / m ²
And wound up in a roll to make an orthopedic bandage. In order to evaluate the physical properties (ease of winding and strength between laminations) of the prepared bandage, the frictional strength and the peel strength were measured by the following methods.

(1) Spread on a horizontal bandage with a friction strength of 20 ° C, fix both ends, spray water immediately at 20 ° C, and put a 150mm length on it.
Put a sled of 450g weight on two stainless steel rods with a diameter of 6.3mm and use a tensile tester 20 seconds after spraying water.
The tension in the horizontal direction at a speed of 250 mm / min, the initial stress, and the stress change of the difference between the stress and the initial stress when the sled moved 100 mm were measured.

The friction strength measured here represents the force required to unwind the roll during the operation of winding the bandage, and the adhesiveness to the glove.

(2) Peeling strength Cut the bandage adjusted to 20 ° C into two pieces of 100mm width and 200mm length, overlap them, spray water at 20 ° C, leave 50mm overlapping part, T-shaped one end Separated into molds,
After a load of 1150 g was applied for 15 minutes, the peel strength was determined at 200 mm / min using a tensile tester after elapse of 24 hours at 20 ° C.

The peel strength measured here indicates the adhesive strength between the wound layers when the bandage is wound.

(3) Operability As for the operability when handling a roll-shaped bandage soaked in water with gloved hands, the above-mentioned frictional strength is one evaluation scale, but it is slightly delicate when actually used. The gloves (latex, polyethylene, vinyl acetate, etc.) are actually wrapped around the bandage and the gloves and the bandage, the layers of the bandage are not too sticky and slippery because the factors affect The sensory test was performed to determine whether or not it was easy to wind with appropriate friction. Very good ones were evaluated as ◎, fairly good ones as ○, poor ones as あ ま り, and poor ones as X.

 The following measurement results are shown in the following table.

As can be seen from the table, Comparative Example 1, in which the content of the PEG ester compound was as low as 1% W / W with respect to the urethane prepolymer, showed good peel strength, that is, good interlayer adhesion.
The gloves, bandages, and the bandages were still very sticky, and the overall evaluation was poor. In Comparative Example 2 in which the content of the PEG ester compound was as high as 12% W / W with respect to the urethane prepolymer, the adhesiveness between the gloves, the bandage, and the layers of the bandage was considerably reduced, and on the contrary, it became slightly slippery. The peel strength was also reduced and the interlayer adhesion was small, and the overall evaluation was not so good that there was a problem in practical use. Comparative Example 3, which does not contain any PEG ester compound, has no problem with the interlayer adhesive strength, but has a large tackiness, a large problem in operability, and a poor overall evaluation.

On the other hand, in Examples 1 to 4 which contained the PEG ester compound moderately, the operability and the interlayer adhesion were good, and the overall evaluation was extremely good or fairly good.

〔The invention's effect〕

According to the present invention, by admixing an ester compound of polyethylene glycol with an orthopedic casting tape using a hydraulic resin, adhesion of the resin to gloves worn by a practitioner is greatly reduced, and further, a roll-shaped resin is formed. When unwrapping the wound around the affected area while unwinding, it does not require a large force to unwind, it can be rolled up as it rolls on the affected area, and it is easy to adjust details after winding up,
It is possible to accurately model it in a desired shape, and it is possible to obtain a sufficient value of the interlayer adhesive force after curing as before, and by using the polyurethane resin composition of the present invention, operability and An orthopedic fixation dressing with excellent fixation properties can be obtained.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-3649 (JP, A) JP-A-62-103071 (JP, A) JP-A-58-146351 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) C08G 18/00-18/87 C08L 75/00-75/16 C09J 175/00-175/16 A61L 15/00-15/64 A61L 25/00

Claims (1)

(57) [Claims] 1. A shaping method characterized by impregnating a base fabric with a polyurethane resin composition comprising a urethane prepolymer comprising a polyol and a polyisocyanate, a catalyst having excellent storage stability, a stabilizer and an ester compound of polyethylene glycol. Surgical casting tape.