Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-02-01
2000-08-15
Mullis, Jeffrey
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524819, 524832, 525 67, 525 69, 525242, 525243, C08F 216
Patent
active
061038210
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to crosslinking agents for emulsion polymers. In particular, the present invention relates to the use of certain crosslinking agents in particulate emulsion polymers, preferably graft copolymers, and molding materials containing them and moldings thereof.
Thermoplastic molding materials which consist of a graft copolymer in a polymer matrix are used for the production of a large number of moldings.
DE-A-1 260 135 discloses thermoplastic molding materials which consist of a copolymer matrix and a graft copolymer. The graft copolymer contains a core of a copolymer of an acrylate of an alcohol of 4-8 carbon atoms and of an acrylate of tricyclodecenyl alcohol. The shell consists of a copolymer from styrene and acrylonitrile. The copolymer matrix consists of styrene and acrylonitrile as monomer units.
DE-A-1 911 882 discloses similar molding materials of a graft copolymer comprising an acrylate core and a styrene/acrylonitrile shell, embedded in a copolymer matrix of styrene and acrylonitrile. The graft copolymers have mean particle diameters of from 150 to 800 nm.
DE-A-2 826 925 discloses thermoplastic molding materials which consist of a graft copolymer of a crosslinked acrylate polymer having a mean particle diameter of about 50-150 nm and a graft shell of styrene and acrylonitrile and a further graft copolymer of a crosslinked acrylate polymer having a mean particle diameter of from about 200 to 500 nm and styrene and acrylonitrile as the graft shell, the two graft copolymers being introduced into an acrylonitrile/styrene copolymer.
DE-A-3 227 555 describes thermoplastic molding materials which contain graft copolymers. The grafting bases consist of crosslinked polyacrylates and the graft shell is synthesized in two stages, from 20 to 70% by weight of a vinylaromatic monomer, in particular styrene, being applied in a first stage and from 30 to 80% by weight of a mixture of a vinylaromatic and of an ethylenically unsaturated monomer, in particular of styrene and of acrylonitrile in a weight ratio of from 90:10 to 60:40, being applied in a second stage. The graft copolymers are present in a copolymer of styrene and acrylonitrile.
These molding materials are resistant to weathering and are impact-resistant. However, the impact strength has to be improved for some applications.
It is an object of the present invention to provide thermoplastic molding materials which contain a particulate emulsion polymer in an amorphous or semicrystalline polymer and have an impact strength which is improved in comparison with the known molding materials.
We have found that this object is achieved, according to the invention, by the use of compounds of the general formula (I) R.sup.3).sub.n --H (I) chlorine and p is 1-100, --O--C(O)--CH.sub.2 --C(.dbd.CH.sub.2)--COOH, 100,000, as crosslinking agents in particulate emulsion polymers having a glass transition temperature below 0.degree. C. and a mean particle size of from 50 to 1000 nm.
The present invention therefore also relates to thermoplastic molding materials containing, based on the sum of the amounts of components A and B and, if required, C and/or D, which altogether gives 100% by weight, by weight of a particulate emulsion polymer having a glass transition temperature below 0.degree. C. and a mean particle size of from 50 to 1000 nm, which contains from 0.5 to 30% by weight, based on the amount of component A, of at least one crosslinking agent as of the formula I as component A, by weight of at least one amorphous or semicrystalline polymer as component B, thereof as component D.
CROSSLINKING AGENTS
We have found, according to the invention, that, by using certain crosslinking agents, it is possible to obtain thermoplastic molding materials which have improved impact strength in comparison with known molding materials.
Compounds of the general formula (I): R.sup.3).sub.n --H (I) chlorine and p is 1-100, --O--C(O)--CH.sub.2 --C(.dbd.CH.sub.2)--COOH, 100,000, are used.
Crosslinking agents of the general formula (I) in which m is an intege
REFERENCES:
patent: 3691260 (1972-09-01), Mittnacht
patent: 3895082 (1975-07-01), Hochberg
patent: 3929693 (1975-12-01), Hochberg
patent: 4224419 (1980-09-01), Swoboda
patent: 4788253 (1988-11-01), Hambrecht
patent: 5373035 (1994-12-01), Wang et al.
Fischer Michael
Lindenschmidt Gerhard
Mc Kee Graham Edmund
Naarmann Herbert
Rosenau Bernhard
BASF - Aktiengesellschaft
Mullis Jeffrey
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