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
1986-11-28
1989-06-20
Schofer, Joseph L.
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...
524831, 524833, C08K 4300
Patent
active
048409910
ABSTRACT:
Aqueous dispersions of partially cross-linked copolymer particles useful in aqueous coating compositions is produced by copolymerizing in aqueous emulsion a mixture of: (A) from 1% to 30% of polyethylenically unsaturated monomer; (B) from 3% to 30% of hydroxy-functional monoethylenically unsaturated monomer; (C) from 0.5% top 10% of a salt-forming monoethylenically unsaturated monomer selected from monoethylenic carboxylic acid monomer and monoethylenic amine monomer; and (D) the balance of the copolymer consisting essentially of copolymerizable monoethylenically unsaturated monomer, preferably nonreactive monomer such as vinyl acetate. The copolymer particle-containing suspension produced by the emulsion copolymerization is coagulated with water immiscible organic solvent which is a poor solvent for the copolymer, such as butanol, to provide a liquid phase containing coagulating solvent and the water and surfactants used in the emulsion copolymerization and a coagulum of the copolymer particles in the suspension. This coagulum, after removal of the liquid phase, is dispersed in water with the aid
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DeSoto, Inc.
Reddick J. M.
Schofer Joseph L.
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