Combinations of associative thickeners and aqueous latex paints

Details Combinations of associative thickeners and aqueous latex paints Combinations of associative thickeners and aqueous latex paints

1986-10-03

1988-04-05

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524501, 524507, C08K 320, C08K 517, C08L 7504

Patent

active

047359811

ABSTRACT:
Alkaline aqueous latex paints are disclosed which have a pH of at least about 7.5 and contain an effective amount of a combination of thickeners constituted by: (I) a urethane polymer having at least three hydrophobic groups, at least two of which are terminal hydrophobic groups, the hydrophobic groups being linked by hydrophilic groups: and (II) an alkali-soluble aqueous emulsion copolymer of: (A) about 20-70 weight percent of an alpha, beta-monoethylenically unsaturated carboxylic acid, typically methacrylic acid; (B) about 20-80 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity, typically ethyl acrylate; (C) about 0.5-60 weight percent of a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated monomer. Semi gloss paints based on copolymers of at least 55% vinyl acetate are preferred, and the paints are desirably buffered with alkaline agent and/or a polycarboxylic acid electrolyte.

REFERENCES:
patent: 4079028 (1978-03-01), Emmons et al.
patent: 4122055 (1978-10-01), Tugukuni et al.
patent: 4442248 (1984-04-01), Kanda et al.
patent: 4507426 (1985-03-01), Blake
patent: 4514552 (1985-04-01), Shay et al.
patent: 4600761 (1986-07-01), Ruffner et al.

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