Thermoplastic moulding compounds

Details Thermoplastic moulding compounds Thermoplastic moulding compounds

1999-03-17

2000-12-19

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525902, C08L 5302

Patent

active

061628670

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to thermoplastic molding compositions comprising copolymerization of -alkyl acrylates, effect, and ##STR1## where R.sup.1 and R.sup.2 are hydrogen or C.sub.1 -C.sub.8 -alkyl, or a C.sub.1 -C.sub.8 -alkyl acrylate or methacrylate, acrylate or methacrylate, and mixtures of these compound soluble in non-polar solvents (Step 1) bonds of the polymer obtained in Step 1) (Step 2), polymer chain, units of a vinylaromatic monomer, diene monomers, second or further) soft phase, and contains, randomly in its polymer chain, units of both a vinylaromatic monomer and a diene, 25.degree. C. and that of the block B/A, before hydrogenation, is below 25.degree. C. and the phase-volume ratio of block A to block B/A is chosen so that the proportion of the hard phase in the entire block copolymer is from 1 to 40% by volume and the proportion by weight of the diene is less than 50% by weight.
The invention relates, furthermore, to molding compositions in which component C) is prepared in a specific manner, to molding compositions in which component(s) C) and/or B) have a specific formulation and/or chemical structure, to the use of these molding compositions for producing films and shaped articles, to films and shaped articles made from these molding compositions, and finally to the use of these films and shaped articles.
Plastic films have various areas of application. Certain films, in particular flexible films with a leather-like appearance, are extensively used in interior decoration, for example of automobiles, or as leather substitutes. They are mostly produced by calendering or extrusion.
The main constituent of these films is currently usually polyvinyl chloride (PVC), which contains plasticizer and frequently also contains other vinyl polymers. However, the films have only limited resistance to ageing, and furthermore the plasticizer which is used can exude out over the course of time.
EP-A 526 813 discloses thermoplastic molding compositions made from a highly crosslinked acrylate rubber with a graft shell of methyl methacrylate or styrene-acrylonitrile, a partially cross-linked acrylate rubber, an ethylene-vinyl acetate copolymer and, if desired, a further polymer based on styrene and/or acrylic compounds. Under the conditions of shaping, to give films for example, these materials tend to undergo undesirable degradation reactions.
DE-A 42 11 412 recommends as a material for films mixtures which are made from styrene-acrylonitrile polymers and thermoplastics and which have a graft shell of an elastomeric polymer. The preparation of graft copolymers of this type is, however, technically complicated, so that it is difficult to obtain consistent product quality.
In particular, films made from presently known molding compositions do not have fully satisfactory thermoforming properties; they also have a high Shore hardness, which does not always allow the desired soft, leather-like surface to be achieved.
It is an object of the present invention to provide thermoplastic molding compositions which are easy to prepare in consistent quality and which can be further processed into shaped articles, in particular into films, without loss of quality arising, for example, through degradation reactions. A further object is to provide, molding compositions from which it is possible to produce shaped articles, in particular films, which are distinguished by good thermoforming properties (high elongation at break and high tear resistance) and by low Shore hardness.
We have found that this object is achieved by means of the thermoplastic molding compositions defined at the outset.
Furthermore, molding compositions comprising specific embodiments of component C) have been found. In addition, the use of the polymer mixtures for producing films and shaped articles, and films and shaped articles made from these materials, have been found. Component A) is present in the novel compositions in an amount, based on the sum of components A), B) and C), of from 30 to 98, preferably from 40 to 90 and particularly pref

REFERENCES:
patent: 5134199 (1992-07-01), Hattori et al.
patent: 5250617 (1993-10-01), Piejko et al.

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