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EP0190892B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process for the preparation of an aqueous dispersion of copolymeric latex polymer

Assignee: Rohm and Haas Co
•
Filing: 1986-01-31
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Granted: 1991-11-13
•
Expires: 2006-01-31
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Abstract

Abstract A process for the preparation of an aqueous dispersion of copolymeric latex polymer which may display enhanced thickening efficiency in aqueous solutions and compositions. The process comprises emulsion-polymerising alpha, beta-ethylenically unsaturated monomer in an aqueous medium, wherein at least some portion of the polymerization occurs in the presence of 3% to 20% by weight based on total monomer of at least one in-process additive having a solubility parameter having the valve of from between 1.64 x 10<-><2> (Jm <3>)<1/2 > to 2.46 x 10 <2> (Jm<-><3>)<1/2 >. The monomer comprises at least one copolymerizable alpha, beta-monoethylenically unsaturated surfactant comonomer, at least one copolymerizable alpha, beta-ethylenically unsaturated carbonoxylic acid comonomer, and at least one monomer selected from nonionic copolymerizable (C2-C12) alpha, beta-ethylenically unsaturated monomer.

Inventors

  • 👤 Ching-Jen Chang

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 22:22
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 104 words
A process for the preparation of an aqueous dispersion of copolymeric latex polymer, said process comprising emulsion-polymerizing alpha, beta-ethylenically unsaturated monomer in an aqueous medium, wherein at least some portion of the polymerization occurs in the presence of 3% to 20% by weight based on total monomer of at least one in-process additive selected from the group consisting of (C₄-C₁₂)alkanols, benzene, toluene, the di(C₁-C₂)alkyl benzenes, and (CH₃)₂CHCO₂CH₂C(CH₃)₂CH(OH)CH(CH₃)₂ wherein said monomer comprises at least one copolymerizable alpha, beta-ethylenically unsaturated surfactant comonomer, at least one copolymerizable alpha, beta-mono-ethylenically unsaturated carboxylic acid comonomer, and at least one comonomer selected from nonionic copolymerizable (C₂-C₁₂) alpha, beta-ethylenically unsaturated monomer.
Claim 2
Dependent Claim 19 words
A process as claimed in claim 1, wherein said in-process additive has a molecular weight of less than 500.
Claim 3
Dependent Claim 65 words
A process as claimed in claim 1 or claim 2, wherein said surfactant comonomer is selected from the compounds of the formula H₂C=C(R)-C(O)-O-[C(R¹)H-CH₂-O-] n -R² wherein R is H or CH₃; R¹ is H or CH₃; n is at least 2; R² is selected from the group consisting of alkyl, aralkyl, alkylaryl, alkylaralkyl, and polycyclic alkyl hydrocarbyl groups having from 12 to 30 carbon atoms.
Claim 4
Dependent Claim 65 words
A process as claimed in any one of the preceding claims, wherein the copolymerizable alpha, beta-mono-ethylenically unsaturated carboxylic acid monomer is selected from (C₃-C₈) ethylenically unsaturated carboxylic acid monomers and salts thereof, and is preferably selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, crotonic acid, beta-acryloxypropionic acid and/or mixtures of beta-acryloxypropionic acid and the higher oligomers of acrylic acid.
Claim 5
Dependent Claim 26 words
A process as claimed in any one of the preceding claims, wherein said nonionic comonomer is selected from the (C₁-C₄)alkyl esters of acrylic and methacrylic acids.

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