CS210046B1 - Mixture for making the tough thermoplastic foils on the base of modified non-softened polyvinylchloride - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blend for the production of tough thermoplastic films based on a non-plasticized blend of vinyl polymer and acrylonitrile, butadiene and styrene terpolymers. The foils are intended, in particular, to stiffen the heels, spokes and shoes of the footwear.

At present, classical materials, ie pressed fiber leather, are still used in the manufacture of footwear toes. Their disadvantage is that they cannot be processed by modern continuous processes. Laminated materials composed of a textile backing to which a dispersion of fibers and thermoplastic particles / e.g. polystyrene /. The deposited dispersion is dried and the material is bonded after the thermoplastic surface has not melted. The disadvantage of the described procedure is the work with solvents, which requires safety and hygiene measures. Another laminate material for making the toes comprises a polyethylene middle foil, ethylene copolymer interlayers and acrylic acid, and textile, leather or cellular rubber cover layers. The material is expensive to manufacture for multiple layers and therefore expensive.

More recently, thermoplastic films have been used for shoe sticks. For example, three polyvinyl chloride-styrene-acrylonitrile copolymer blends and acrylonitrile, butadiene-styrene terpolymers, and mixtures of polyvinyl chloride with polybutydiene graft copolymer with styrene-acrylonitrile blends are described. Their advantage is the possibility of applying modern economically advantageous processing methods. The mechanical properties of the films of the type described are relatively good, but it is nevertheless desirable for some applications to achieve good values, in particular elasticity, arch strength and bending resistance, expressed in the wearing time of the shoe for 3 months.

An improvement in the flexural properties was achieved by modifying polyvinyl chloride with an acrylonitrile-butadiene-styrene terpolymer in combination with 15-30% nitrile rubber. However, the described compositions of this kind contain at the same time about 15% of the plasticizer and their disadvantage is that they do not achieve the desired elasticity.

It has now been found that unplasticized compositions can be used to produce films with improved properties, which are based on 100% by weight of the composition. 20 parts to 150 wt. 0.5 parts by weight of acrylonitrile, butadiene and styrene terpolymer; parts of nitric rubber. Polyvinyl chloride may be used as the vinyl polymer. It is particularly preferred to partially or completely replace the vinyl chloride terpolymer with vinyl acetate. This substitution does not have a significant effect on the physical-mechanical properties of the composition, but allows the processing temperature to be reduced by about 10 ° C. The compositions may further comprise conventional additives, in particular stabilizers, e.g.

It has been found that films made from the compositions according to the invention have a greater arch flexibility and a higher arch strength at 0.4 mm to 20 Z thickness than the polyvinyl chloride / acrylonitrile-butadiene-styrene terpolymer films with corresponding flexural properties.

For use in the manufacture of footwear, the foil is provided with a double-sided adhesive coating.

In order to further elucidate the invention, the following examples are provided »

Example 1 basis weight vault elasticity vault strength

520 g / m @ 2

The mixture containing / in wt. parts /: Trial wearing time did not cause problems Example 3 polyvinylchloride acrylonitrile, butadiene and styrene terpolymer / 19,6: 40,2: 40,2 / '100 100 ALIGN! In the fluidic mixer, the agitating / mass mixer is mixed. parts /: mixture content - nitrílkaučuk 15 Dec polyvinylchloride 100 ALIGN! organotin stabilizer 2.5 acrylonitrile terpolymer, buta- diene and stytene / 19,6: 40,2: 40,2 / 100 ALIGN! Mix thoroughly after mixing plastifi- nitrílkaučuk 1 .5 forged on a double-cylinder at a temperature of 130 ° C and on organotin stabilizer 2.5

foils with a thickness of 0.4 mm are drawn at a temperature of 130 to 160 ° C in a four-roll calender. The foil has the following characteristics:

basis weight vault elasticity vault strength test wear time

Example 2

520 g / in%

0.46 MPa complies

A film having a thickness of 0.4 mm having the following characteristics is withdrawn from the mixture under the same conditions as in Example 1:

basis weight vault elasticity vault strength test wear time

520 g / tn

X

0.28 MPa complies

In a fluidized bed mixer, the mixture containing the same mass is mixed. ratio of the raw material shown in Example 1, only polyvinyl chloride is replaced by a copolymer of vinyl chloride with vinyl acetate in a ratio of 90:10. The blended mixture is again plasticized on a two-roll roll at 120 ° C, and on a four-roll roll at a temperature of 120 to 140 ° C a 0.4 mm thick film with the following properties is drawn:

The physical-mechanical properties of the films according to the invention in all cases exceed the properties of the films based on a mixture of polyvinyl chloride with acrylonitrile-butadiene-styrene terpolymer, in which the arch strength does not exceed 0.24 MPa and the arch flexibility 42 X »

Claims (2)

A composition for producing a tough thermoplastic film based on an unplasticized vinyl polymer and a terpolymer of acrylonitrile, butadiene and styrene, characterized in that it comprises per 100 wt. 20 parts to 150 wt. 0.5 parts by weight of acrylonitrile, butadiene and styrene copolymer; parts of nitrile rubber. Y N O L E Z U 2. A composition for the production of a tough thermoplastic film according to claim 1, characterized in that it comprises, as a vinyl polymer, polyvinyl chloride or a copolymer of vinyl chloride with vinyl acetate or mixtures thereof.