Particle agglomeration in rubber latices
AssigneeThe Dow Chemical Company
InventorsDavid E. Henton, Teresa M. O'Brien
Life of this patent
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Abstract
Particle size distribution in elastomeric latex preparations is advantageously controlled and improved by treatment of the prepared latex with an agglomerating agent (AgAg) copolymer having an elastomeric "core" and grafted thereto a "shell" of interpolymer comprising polymerized acid and ester comonomers. The grafted interpolymer can beneficially be a polymerized mixture of ethyl acrylate and methacrylic acid. Agglomerated latex product can be recovered for direct utilization of its favorably particle size-distributed elastomeric component or for other purposes such as grafted polymer blends, ABS and similar products.
Claims25
An agglomerating agent (AgAg) suitable for agglomerating the particles of a latex of an elastomeric material which AgAg is a dispersion of particles having core material and shell material, said AgAg comprising:
- (a) as shell material substantially grafted to the core material, from about 5 to about 50 weight percent, based on the total weight of the AgAg of a polymerized mixture of:
- (i) from about 80 to about 99.5 weight percent based on the total weight of component (a) of ester monomer of the formula:
- ##STR7## wherein R.sub.1 is a lower alkyl radical containing up to about 4 carbon atoms;
- and
- (ii) from about 0.5 to about 20 weight percent based on weight component (a) of an ethylenically unsaturated mono- or difunctional carboxylic acid having from about 3 to about 8 carbons;
- (b) as core material, from about 50 to about 95 weight percent, based on the total weight of the AgAg, of an elastomeric material, such core material having polymerized therein essentially no ester monomer which is polymerized in the shell material.
Dependencies are inferred from the claim text.