Waterborne polymers having pendant allyl groups
AssigneeEastman Chemical Company
InventorsJames W. Taylor, Martha J. Collins, Mark D. Clark
Life of this patent
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Abstract
This invention provides polymers useful in coating compositions. The polymers are prepared via a free radical polymerization using ethylenically unsaturated monomers. The polymers of this invention possess pendant allylic groups which are capable of effecting free-radical flux when the compositions are applied to a substrate and exposed to oxygen. Coatings formed from preferred compositions possess superior solvent, print, and block resistance.
Claims25
A polymeric particle having a mean diameter of about 35 to 350 nm, said particle comprising a curable polymer composition comprising the reaction product of the free radical emulsion polymerization of
- (a) an allyl group-containing ethylenically unsaturated monomer, wherein said allyl group-containing ethylenically unsaturated monomer is
- (i) a compound having at least one allyl group and at least one other ethylenically unsaturated group other than an allyl or a group which is capable of a free radical reaction;
- or
- (ii) a compound having three or more allyl groups;
- wherein said allyl group is bonded to a moiety which is other than a carbonyl group, with
- (b) (i) a styrenic monomer selected from the group consisting of styrene, alpha-methyl styrene, vinyl naphthalene, vinyl toluene, and chloromethyl styrene;
- or
- (ii) an alkyl (alkyl)acrylate,
- and optionally other ethylenically unsaturated monomers, wherein said particle possesses sufficient available pendant allyl moieties to effect free-radical flux upon application to a substrate to form a film, and exposure to oxygen at temperatures of greater than about 5.degree. C.
A generally spherical polymeric particle having a core portion and a shell portion, wherein said core portion is a polymer composition comprising the reaction product of the free radical emulsion polymerization of ethylenically unsaturated monomers, wherein the gel content of said core is in a range of 0 to 99%, and the swell ratio of the gel portion in acetone ranges from 2:1 to 30:1, and wherein said shell portion is a polymer composition comprising the reaction product of the free radical emulsion polymerization of an allyl group-containing ethylenically unsaturated monomer and a styrenic monomer, and optionally other ethylenically unsaturated monomers, wherein said shell possesses a gel content of about 0 to 90%, and sufficient available pendant allyl functionality to effect free-radical flux upon application to a substrate to form a film, and exposure to oxygen at temperatures as low as about 0.degree. C., wherein said particle having an overall T.sub.g of about -50.degree. C. to about 50.degree. C.
Dependencies are inferred from the claim text.