Aqueous polymer composition and method of preparing thereof

Patent metadata

Field	Value
Publication number	US-12497475-B2
Application number	US-202018026882-A
Country	US
Kind code	B2
Filing date	Oct 10, 2020
Priority date	Oct 10, 2020
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

An aqueous polymer composition comprises (A) a specific emulsion polymer comprising structural units of a cycloalkyl (meth)acrylate, structural units of an acetoacetoxy or acetoacetamide functional monomer, and structural units of a phosphorous acid monomer, a salt thereof, or mixtures thereof; and (B) a specific amount of a waterborne resin comprising at least one fatty acid ester segment and having a number average molecular weight of 20,000 g/mol or less, based on the total dry weight of the emulsion polymer and the waterborne resin. A coating composition comprising such aqueous polymer composition provides coatings made therefrom with improved anti-corrosion property.

First claim

What is claimed is:

1 . An aqueous polymer composition comprising,
(A) an emulsion polymer comprising, based on the weight of the emulsion polymer, from 5% to 28% by weight of structural units of a cycloalkyl (meth) acrylate, from 0.1% to 10% by weight of structural units of an acetoacetoxy or acetoacetamide functional monomer, from 0.05% to 10% by weight of structural units of a phosphorous acid monomer, a salt thereof, or mixtures thereof, from zero to 10% by weight of an additional ethylenically unsaturated acid monomer, and structural units of an additional ethylenically unsaturated nonionic monomer; and (B) from 0.7% to 7.8% by dry weight of a waterborne resin comprising at least one fatty acid ester segment and having a number average molecular weight of 20,000 grams per mole or less, based on the total dry weight of the emulsion polymer and the waterborne resin.

2 . The aqueous polymer composition of claim 1 , wherein the waterborne resin is selected from the group consisting of a waterborne epoxy ester, an unsaturated fatty acid ester modified acrylic copolymer, or mixtures thereof.

3 . The aqueous polymer composition of claim 2 , wherein the unsaturated fatty acid ester modified acrylic copolymer comprises, by weight based on the weight of the unsaturated fatty acid ester modified acrylic copolymer, 20% or more of structural units of (meth)acrylic acid.

4 . The aqueous polymer composition of claim 2 , wherein the unsaturated fatty acid ester modified acrylic copolymer is a castor oil or sulphated castor oil modified acrylic copolymer.

5 . The aqueous polymer composition of claim 2 , wherein the waterborne epoxy ester comprises a reaction product of an unsaturated fatty acid and optionally an additional carboxylic acid-group-containing compound with an epoxy compound.

6 . The aqueous polymer composition of claim 5 , wherein the waterborne epoxy ester is a (meth)acrylic acid functionalized waterborne epoxy ester.

7 . The aqueous polymer composition of claim 1 , wherein the acetoacetoxy or acetoacetamide functional monomer is selected from the group consisting of acetoacetoxyethyl methacrylate, acetoacetoxyethyl acrylate, acetoacetoxypropyl methacrylate, allyl acetoacetate, acetoacetoxybutyl methacrylate, 2,3-di(acetoacetoxy)propyl methacrylate, or mixtures thereof.

8 . The aqueous polymer composition of aby-one of claim 1 , wherein the cycloalkyl (meth)acrylate is selected from the group consisting of cyclohexyl methacrylate, cyclohexyl acrylate, methcyclohexyl acrylate, or mixtures thereof.

9 . The aqueous polymer composition of claim 1 , wherein the phosphorous acid monomer is selected from the group consisting of phosphoethyl methacrylate, phosphoethyl acrylate, allyl ether phosphate, or mixtures thereof.

10 . The aqueous polymer composition of claim 1 , wherein the emulsion polymer comprises, by weight based on the weight of the emulsion polymer, from 10% to 25% of structural units of the cycloalkyl (meth)acrylate; from 1.5% to 4% of structural units of the acetoacetoxy or acetoacetamide functional monomer; from 1.5% to 4% of structural units of the phosphorous-containing acid monomer, the salt thereof, or mixtures thereof; and structural units of the additional ethylenically unsaturated nonionic monomer; and optionally, from zero to 3% of structural units of an ethylenically unsaturated functional monomer having one or more functional groups selected from ureido, amide, amino, silane, hydroxyl, or combinations thereof.

11 . The aqueous polymer composition of claim 1 , comprising from 1% to 7.5% by dry weight of the waterborne resin, based on the total dry weight of the emulsion polymer and the waterborne resin.

12 . The aqueous polymer composition of claim 1 , wherein the emulsion polymer further comprises structural units of a polymerizable surfactant.

13 . A method of preparing the aqueous polymer composition of claims 1 by admixing the emulsion polymer with the waterborne resin.

14 . A coating composition comprising the aqueous polymer composition of claims 1 and optionally a pigment.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas
• Dow Chemical China Investment Company Ltd

Inventors

• Wu Yan
• Zheng Baoqing
• Zhan fu
• Piao Changkun
• Zhao Juan
• Hu Hao
• Xu Xiuqing
• Tang Jia
• Yun Dong

Classifications

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L2201/52

  Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08F230/02

  containing phosphorus · CPC title

• C08F2/22

  Emulsion polymerisation · CPC title