Multiphase core/shell polymers
AssigneeMonsanto Company
InventorMassimo Baer
Life of this patent
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Abstract
A multiphase core//shell polymer comprising a crosslinked elastomer core and a rigid thermoplastic polymer shell comprising a mono alkyl maleate or fumarate, styrene and optionally a monomer selected from the group consisting of C.sub.1 to C.sub.8 alkyl acrylates and methacrylates, acrylonitrile and methacrylonitrile. The core has an average particle diameter in the range of about 0.3 to about 0.8 micron and the rigid shell has a thickness of at least about 0.025 micron. The multiphase core//shell polymers are useful for blending with polyamides to provided toughened polyamide compositions.
Claims4
A multiphase core//shell polymer comprising about 50 to about 90 parts by weight of a crosslinked elastomer core and about 10 to about 50 parts by weight of a rigid thermoplastic polymer shell comprising from about 1 to about 25 parts by weight of an interpolymerized C.sub.1 to C.sub.4 monoalkyl maleate or fumarate, from about 20 to about 80 parts by weight of interpolymerized styrene, from about 0 to about 79 parts by weight of an interpolymerized C.sub.1 to C.sub.8 alkyl acrylate or methacrylate and from about 0 to about 45 parts by weight of interpolymerized acrylonitrile or methacrylonitrile based on 100 parts by weight of shell interpolymer, wherein the core of the multiphase core//shell polymer has a weight average particle diameter in the range of about 0.3 to about 0.8 micron and the rigid shell has a thickness of at least about 0.025 micron and wherein the glass transition temperature of the rigid thermoplastic polymer shell is at least about 35.degree. C.
Dependencies are inferred from the claim text.