Back to results
US 2017/0321059 A1Published application
Aqueous polymer dispersion and process of making the same
AssigneeDow Global Technologies LLC
InventorsXiaohong Yang, Yawei Xu
Life of this patent
Estimating the term…
Abstract
An aqueous polymer dispersion, a process of preparing the aqueous polymer dispersion, and an aqueous coating composition comprising the aqueous polymer dispersion; and the aqueous coating composition capable of providing coating films with good properties including coffee resistance and early block resistance.
Claims14
An aqueous dispersion of a multistage polymer, wherein the multistage polymer comprises:
- (A) a polymer A comprises as polymerized units, based on the weight of the polymer A,
- (a1) from 75% to 92% by weight of a hydrophilic (meth)acrylic acid alkyl ester;
- (a2) from 2.1% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (a3) from 5% to 15% by weight of an acid monomer comprising from 4% to 14% by weight of an α, β-ethylenically unsaturated carboxylic acid and from 1% to 9% by weight of a phosphorous-containing acid monomer, and
- wherein the polymer A has a number average molecular weight of from 3,000 to 100,000;
- and
- (B) a polymer B comprises as polymerized units, based on the weight of the polymer B,
- (b1) from 81% to 99% by weight of a hydrophobic monomer selected from a vinyl aromatic monomer, a hydrophobic (meth)acrylic acid alkyl ester, or mixtures thereof;
- (b2) from 0.8% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (b3) from 0 to 15% by weight of a hydrophilic monomer;
- wherein the polymer B has a glass transition temperature at least 40° C. lower than that of the polymer A, and the weight ratio of the polymer A to the polymer B is from 25:75 to 50:50.
10 more elements
A process of preparing an aqueous dispersion of a multistage polymer by a multistage free-radical polymerization, comprising:
- (i) preparing a polymer A in an aqueous medium by a free-radical polymerization in the presence of a chain transfer agent and neutralizing the obtained polymer A to a pH value of at least 6, wherein the polymer A comprises as polymerized units, based on the weight of the polymer A,
- (a1) from 75% to 92% by weight of a hydrophilic (meth)acrylic acid alkyl ester;
- (a2) from 2.1% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (a3) from 5% to 15% by weight of an acid monomer comprising from 4% to 14% by weight of an α, β-ethylenically unsaturated carboxylic acid and from 1% to 9% by weight of a phosphorous-containing acid monomer;
- and
- (ii) preparing a polymer B in the presence of the polymer A obtained from step (i) by a free-radical polymerization, wherein the polymer B comprises as polymerized units, based on the weight of the polymer B,
- (b1) from 81% to 99% by weight of a hydrophobic monomer selected from a vinyl aromatic monomer, a hydrophobic (meth)acrylic acid alkyl ester, or mixtures thereof;
- (b2) from 0.8% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (b3) from 0 to 15% by weight of a hydrophilic monomer;
- and
- wherein the polymer B has a glass transition temperature at least 40° C. lower than that of the polymer A, and the weight ratio of the polymer A to the polymer B is from 25:75 to 50:50.
10 more elements
A process of preparing an aqueous dispersion of a multistage polymer by a multistage free-radical polymerization, comprising:
- (i) preparing a polymer B in an aqueous medium in the presence of a surfactant by a free-radical polymerization, wherein the polymer B comprises as polymerized units, based on the weight of the polymer B,
- (b1) from 81% to 99% by weight of a hydrophobic monomer selected from a vinyl aromatic monomer, a hydrophobic (meth)acrylic acid alkyl ester, or mixtures thereof;
- (b2) from 0.8% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (b3) from 0 to 15% by weight of a hydrophilic monomer;
- and
- (ii) preparing a polymer A by a free-radical polymerization in the presence of a chain transfer agent and neutralizing the obtained multistage polymer to a pH value of at least 7, wherein the polymer A comprises as polymerized units, based on the weight of the polymer A,
- (a1) from 75% to 92% by weight of a hydrophilic (meth)acrylic acid alkyl ester;
- (a2) from 2.1% to 10% by weight of a carbonyl-containing functional monomer;
- and
- (a3) from 5% to 15% by weight of an acid monomer comprising from 4% to 14% by weight of an α, β-ethylenically unsaturated carboxylic acid and from 1% to 9% by weight of a phosphorous-containing acid monomer;
- and
- wherein the polymer B has a glass transition temperature at least 40° C. lower than that of the polymer A, and the weight ratio of the polymer A to the polymer B is from 25:75 to 50:50.
10 more elements
Dependencies are inferred from the claim text.