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US 12,398,323 B2Granted
Polymer powder compositions which can be redispersed in water
AssigneeWacker Chemie AG
InventorAbdulmajid Hashemzadeh
Life of this patent
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Abstract
Spray dried homogeneous mixtures of a high molecular mass flocculating agent, a base polymer dispersion, and a protective colloid are useful for homogenously stabilizing mixtures such as dust, sand, and/or soil and produce a stabilized composition of high strength.
Claims24
A water-redispersible polymer powder composition comprising:
- a) a base polymer prepared by polymerizing one or more of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms, methacrylic esters and/or acrylic esters of alcohols having 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and/or vinyl halides,
- b) one or more flocculating agents selected from the group consisting of homopolymers of acrylamide, which has the formula CH2═CH-C (═O)-NH2, or copolymers of acrylamide with one or more comonomers selected from the group consisting of methacrylamide, acrylic acid, methacrylic acid, acrylonitrile, and 2-acrylamido-2-methylpropanesulfonic acid, where the one or more flocculating agents b) have a Brookfield viscosity of at least 20 mPas in 1 wt % solution in water at 23° C. after conditioning to 23° C., using spindle 1 or 2, at 20 revolutions per minute,
- wherein the acrylamide homopolymers and acrylamide copolymers have weight-average molecular weights Mw of 1,000,000 g/mol to 30,000,000 g/mol, determined by size exclusion chromatography (SEC) against polystyrene standards, in THE, at 40° C.
A water-redispersible polymer powder composition comprising:
- a) a base polymer prepared by polymerizing one or more of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms, methacrylic esters and/or acrylic esters of alcohols having 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and/or vinyl halides,
- b) one or more flocculating agents selected from the group consisting of homopolymers acrylamide, which has the formula CH2═CH-C (═O)-NH2, or copolymers of acrylamide with one or more comonomers selected from the group consisting of methacrylamide, acrylic acid, methacrylic acid, acrylonitrile, and 2-acrylamido-2-methylpropanesulfonic acid, where the one or more flocculating agents b) have a Brookfield viscosity of at least 20 mPas in 1 wt % solution in water at 23° C. after conditioning to 23° C., using spindle 1 or 2, at 20 revolutions per minute,
- wherein at least one of the one or more flocculating agents is a copolymer which contain 60 to 90 wt % of acrylamide units and 10 to 40 wt % of acrylic acid units.
A water-redispersible polymer powder composition comprising:
- a) a base polymer prepared by polymerizing one or more of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms, methacrylic esters and/or acrylic esters of alcohols having 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and/or vinyl halides,
- b) one or more flocculating agents selected from the group consisting of homopolymers acrylamide, which has the formula CH2═CH-C (═O)-NH2, or copolymers of acrylamide with one or more comonomers selected from the group consisting of methacrylamide, acrylic acid, methacrylic acid, acrylonitrile, and 2-acrylamido-2-methylpropanesulfonic acid, where the one or more flocculating agents b) have a Brookfield viscosity of at least 20 mPas in 1 wt % solution in water at 23° C. after conditioning to 23° C., using spindle 1 or 2, at 20 revolutions per minute, wherein the one or more flocculating agents b) are homopolymers of acrylamide, which has the formula CH2═CH-C (═O)-NH2, or copolymers of acrylamide containing 60 to 90 wt. % of acrylamide and 10 to 40 wt. % of acrylic acid, wherein the wt. percents of acrylamide and acrylic acid total 100 wt. %.
Dependencies are inferred from the claim text.