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US 5,336,720 AGranted
Impact resistant polymers
AssigneeRohm and Haas Company
InventorsSusanna E. Richards, William L. Wills, Donna Wetzel, Anibal Rosado
Life of this patent
Estimating the term…
Abstract
An impact resistant graft polymer and an emulsion polymerization process comprising: 1) an agglomerated rubber latex made from a rubber latex and a polymerized polymeric additive, and 2) a grafted polymer.
Claims19
An impact resistant graft polymer composition comprising:
- from about 60 to about 95 parts by weight based on 100 parts of total graft copolymer composition of an agglomerated rubber (C) latex having the following composition:
- (a) 100 parts by weight based on the sum of the parts of synthetic rubber latex and polymeric additive, of a synthetic rubber latex (A) having a particle distribution between about 60 nm. and about 200 nm., and a pH from about 8.0 to about 10.0;
- and
- (b) from about 0.1 to about 5.0 parts by weight based on the sum of the parts of synthetic rubber latex and polymeric additive, of a polymerized polymeric additive (B) having an average particle diameter of about 100 nm. to about 300 nm., and formed by polymerizing:
- (1) at least 38% to about 90% by weight of at least one unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, itaconic acid, acryloxypropionic acid, or crotonic acid;
- (2) from about 5 to 57% by weight of methyl methacrylate;
- (3) from 5 to 10% by weight of butyl acrylate;
- and
- 2) from about 5 to about 40 parts by weight based on 100 parts of total graft copolymer composition of a grafted polymer (D) having the following composition:
- (a) at least 30% by weight of at least one monomer selected from styrene, acrylonitrile, methyl methacrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, butyl acrylate, ethyl acrylate, itaconic acid, methacrylic acid, or acryloxypropionic acid;
- and
- (b) less than 30% by weight of a vinyl monomer having CH.sub.2 =C<copolymerizable therewith.
9 more elements
A process for producing an impact resistant graft polymer comprising:
- 1) emulsion polymerizing:
- (a) from at least 38% to about 90% by weight of unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, itaconic acid, acryloxypropionic acid, or crotonic acid;
- (b) from about 5 to 57% by weight methyl methacrylate;
- and
- (c) from 5 up to 10% by weight of butyl acrylate, to obtain a polymeric additive latex additive (B) having an average particle diameter of from about 100 nm. to about 300 nm.;
- 2) adding from about 0.1 to about 5.0 parts by weight (as weight of solid component) of said polymeric additive latex (B) to 100 parts by weight (as weight of solid component) of synthetic rubber latex (A) which has a pH of from about 8.0 to about 10.0, to form an agglomerated rubber latex (C) having a particle diameter ranging from about 200 nm. to about 1000 nm.;
- and
- 3) emulsion polymerizing:
- (a) from about 5 to about 40 parts by weight based on 100 parts of said impact-resistant grafted copolymer of grafted polymer (D) which comprises:
- (aa) at least 30% by weight of at least one monomer selected from styrene, acrylonitrile, methyl methacrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, butyl acrylate, or ethyl acrylate;
- and
- (bb) less than 30% by weight of a vinyl monomer having CH.sub.2 =C<copolymerizable therewith, in the presence of
- (b) from about 60 to about 95 parts by weight (as weight of solid component) based on 100 parts of said impact-resistant graft copolymer of said agglomerated rubber latex (C).
10 more elements
Dependencies are inferred from the claim text.