초록 ▼

There are disclosed stable, aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of methacrylic or acrylic acid, (2) about 0.5-25% by weight of an N-alkyl acrylamide, and (3) at least 25% by weight, to a total of 100%, of a C1-C4 alkyl (meth)acrylate, and, optiona

There are disclosed stable, aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of methacrylic or acrylic acid, (2) about 0.5-25% by weight of an N-alkyl acrylamide, and (3) at least 25% by weight, to a total of 100%, of a C1-C4 alkyl (meth)acrylate, and, optionally, included in the total monomer mixture a small amount of (4) about 0.05-1% by weight of a polyethylenically unsaturated monomer. The emulsion copolymers, when neutralized and solubilized by addition of an alkali, are high efficiency thickeners for aqueous systems and have improved tolerance to ionic or electrolyte content. Typical systems that can be thickened are paint latices, cosmetic preparations, food preparations, ionic detergents, dye pastes for textiles, pharmaceuticals, and oil well drilling muds. Surfactants enhance the thickening properties afforded by the copolymers.

대표청구항 ▼

A copolymer polymerized from a monomer system comprising (1) at least about 10 weight percent of a monomer or a mixture of monomers selected from the group consisting of methacrylic acid, itaconic acid, acrylic acid, acryloxypropionic acid, fumaric acid, maleic acid, citraconic acid and crotonic aci

A copolymer polymerized from a monomer system comprising (1) at least about 10 weight percent of a monomer or a mixture of monomers selected from the group consisting of methacrylic acid, itaconic acid, acrylic acid, acryloxypropionic acid, fumaric acid, maleic acid, citraconic acid and crotonic acid; (2) about 0.5 to 25 weight percent of at least one monomer of the formula: H2C〓CH－C(O)－NH－R wherein: R is selected from the group consisting of alkyl, alkylaryl, and polycyclic alkyl groups having 8 to 30 carbon atoms; (3) optionally at least one copolymerizable ethylenically unsaturated monomer selected from the group consisting of compounds of the formula H2C〓CYZ wherein (a) Y is H and Z is COOR″, C6H4R′″, CN, Cl, CONH2, OC(O)R″″or CH〓CH2; (b) Y is C1-C4 alkyl and Z is COOR″, C6H4R″″, CN, CONH2, or CH〓CH2; or (c) Y and Z are Cl; and R″is C1-C8 alkyl or C2-C8 hydroxyalkyl or lower alkoxy(C2-C8)alkyl; R′″is H, Cl, Br, or C1-C4 alkyl; and R″″is C1-C8 alkyl; and (4) zero to 1.0 weight percent of a polyethylenically unsaturated monomer.