Vinyl acetate interpolymer latices
AssigneeMonsanto Company
InventorIrving Serlin
Life of this patent
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Abstract
An aqueous latex consisting essentially of an acid modified vinyl ester interpolymer and 0.8 parts by weight or less of a protective colloid per 100 parts by weight of interpolymer. The vinyl ester interpolymer comprises about 3 to about 7 weight percent of carboxylic acid groups supplied by an interpolymerized C.sub.4 -C.sub.10 vinylene monobasic carboxylic acid monomer. The aqueous latex is useful as an aqueous dielectric coating binder in the manufacture of electrographic recording materials.
Claims20
An aqueous latex consisting essentially of a partially neutralized acid-modified interpolymer of a C.sub.4 -D.sub.6 vinyl ester and a protective colloid, wherein the vinyl ester interpolymer comprises from about 3 to about 7 weight percent of carboxylic acid groups supplied by an interpolymerized C.sub.4 -C.sub.10 vinylene monobasic carboxylic acid monomer, wherein the neutralizing agent is a volatile base, wherein the concentration of protective colloid is less than about 0.8 parts by weight per 100 parts by weight of the interpolymer and wherein the particle size of the latex is in the range of from 0.05 to about 0.5 microns.
A method of preparing an aqueous latex consisting essentially of a partially neutralized acid-modified interpolymer of a C.sub.4 -C.sub.6 vinyl ester and a protective colloid, wherein the vinyl ester interpolymer comprises from about 3 to about 7 weight percent of carboxylic acid groups supplied by an interpolymerized C.sub.4 -C.sub.10 vinylene monobasic carboxylic acid monomer, wherein the neutralizing agent is a volatile base, wherein the concentration of protective colloid is less than about 0.8 parts by weight per 100 parts by weight of the interpolymer and wherein the particle size of the latex is in the range of about 0.05 to about 0.5 microns, said method comprising:
- A. interpolymerizing the vinyl ester and vinylene monobasic carboxylic acid monomer in aqueous suspension at a pH in the range of about 6.0 to about 6.2 in the presence of the protective colloid while adding incrementally sufficient of the volatile base to neutralize from about 10 to about 30 percent of the vinylene monobasic carboxylic acid monomer;
- and
- B. adjusting the pH of the interpolymer suspension to a value in the range of about 6.2 to about 7.5 and agitating the interpolymer suspension to form the latex.
Dependencies are inferred from the claim text.