초록 ▼

Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerizing in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerizable carboxylic acid monomers, up to 5% of a difunctional crosslinking monomer and one or more carboxyl-free re

Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerizing in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerizable carboxylic acid monomers, up to 5% of a difunctional crosslinking monomer and one or more carboxyl-free relatively water insoluble polymerizable vinyl monomers. The resulting microgel particles are water-swellable and may be employed as stabilizers for use in the preparation of aqueous dispersions of film-forming resins containing smaller amounts of organic solvents than conventional aqueous dispersions of this type. Such dispersions are useful as coating compositions, yielding coatings having less water sensitivity and improved adhesion as compared with coatings obtained from conventional aqueous dispersions of film-forming resins.

대표청구항 ▼

A polymeric microgel composition comprising discrete particles of crosslinked, aqueous emulsion polymerized copolymer comprising: a. at least one polymerizable carboxylic acid group-free polymerizable vinyl monomer selected from the group consisting of polymerizable vinyl aromatic monomers, methacry

A polymeric microgel composition comprising discrete particles of crosslinked, aqueous emulsion polymerized copolymer comprising: a. at least one polymerizable carboxylic acid group-free polymerizable vinyl monomer selected from the group consisting of polymerizable vinyl aromatic monomers, methacrylate ester monomers, nitrile monomers, vinyl halide monomers, mixtures thereof, and mixtures thereof with minor amounts of vinyl ester monomers and alkyl acrylate monomers in an amount of sufficient to provide a major portion of said copolymer; b. from about 10 to 50%, based on the total monomer weight, of at least one polymerizable vinyl monomer selected from the group consisting of ab5%, based on the total monomer weight, of a difunctional cross-linking monomer having at least two polymerizable double bonds; said microgel particles being water-swellable and exhibiting a stability in aqueous media of at least one week when an aqueous dispersion of said microgel particles of about 20% solids content is maintained at 140°F.