Aqueous dispersions of comb copolymers and coatings produced therefrom
AssigneeRohm and Haas Company
InventorsDavid M. Fasano, Karl A. Bromm, Willie Lau, Jack C. Thibeault, David A. Larson, Paul R. Van Rheenen
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Abstract
An aqueous coating composition comprising a comb copolymer is disclosed. A method of forming a coating from the aqueous coating composition, and a coating formed by that method are also disclosed, as is a method of forming the comb copolymer. The comb copolymer is characterized in that aqueous dispersions of the comb copolymer have a Hard/Soft Balance Advantage value of at least 25%. The aqueous coating composition is capable of producing coatings having an excellent balance of hard and soft properties.
Claims2
A method of forming a dry coating comprising the steps of:
- (A) preparing a plurality of comb copolymer particles by a polymerization method comprising the steps of:
- (a) forming a macromonomer aqueous emulsion comprising a plurality of water-insoluble particles of macromonomer, wherein:
- said step of forming said macromonomer comprises polymerizing in an aqueous emulsion at least one first ethylenically unsaturated monomer in the presence of a transition metal chelate chain transfer agent and a free radical initiator;
- and
- said macromonomer comprises polymerized units of at least one first ethylenically unsaturated monomer, said macromonomer further having:
- (i) a degree of polymerization of from 10 to 1000;
- (ii) at least one terminal ethylenically unsaturated groups;
- (iii) less than 5 weight percent polymerized acid-containing monomer, based on said macromonomer;
- and
- (iv) no polymerized mercaptan-olefin compounds;
- (b) forming a monomer composition comprising at least one second ethylenically unsaturated monomer;
- (c) combining at least a portion of said macromonomer aqueous emulsion and at least a portion of said monomer composition to form a polymerization reaction mixture;
- and
- (d) polymerizing said macromonomer with said second ethylenically unsaturated monomer in the presence of an initiator to produce said plurality of comb copolymer particles;
- (B) forming an aqueous coating composition comprising said plurality of comb copolymer particles;
- (C) applying said coating composition to a substrate;
- and
- (D) drying, or allowing to dry, said applied coating composition.
Dependencies are inferred from the claim text.