Patent ID: 6762240
Filing Date: 2004-07-13
Classification: C08F,C09D

Abstract:
A latex emulsion comprising crosslinked polymeric microparticles dispersed in an aqueous continuous phase in latex emulsion form, the polymeric microparticles prepared from a monomer mix comprised of:(a) at least 20 weight percent of a crosslinking monomer having two or more sites of reactive unsaturation and/or monomers having one or more functional groups capable of reacting to form crosslinks after polymerization; (b) at least 5 weight percent of a polymerizable ethylenically unsaturated monomer having hydrophilic functional groups having the following structures (I) and/or (II): wherein A is selected from H and C1-C3 alkyl; B is selected from â€”NR1R2, â€”OR3 and â€”SR4, where R1 and R2 are independently selected from H, C1-C18 alkyl, C1-C18 alkylol and C1-C18 alkylamino, R3 and R4 are independently selected from C1-C18 alkylol, C1-C18 alkylamino, â€”CH2CH2â€”(OCH2CH2)nâ€”OH where n is 0 to 30, and, â€”CH2CH2â€”(OC(CH3)HCH2)mâ€”OH where m is 0 to 30, D is selected from H and C1-C3 alkyl; and E is selected from â€”CH2CHOHCH2OH, C1-C18 alkylol, â€”CH2CH2â€”(OCH2CH2)nâ€”OH where n is 0 to 30, and â€”CH2CH2â€”(OC(CH3)HCH2)mâ€”OH where m is 0 to 30; and(c) the balance comprised of one or more polymerizable ethylenically unsaturated monomers, wherein (a), (b) and (c) are different from each other, wherein the crosslinking monomer having two or more sites of reactive unsaturation in (a) is one or more selected from the group consisting of ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, 1,4-butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, glycerol di(meth)acrylate, glycerol allyloxy di(meth)acrylate, 1,1,1-tris(hydroxymethyl)ethane di(meth)acrylate, 1,1,1-tris(hydroxymethyl)ethane tri(meth)acrylate, 1,1,1-tris(hydroxymethyl)propane di(meth)acrylate, 1,1,1-tris(hydroxymethyl)propane tri(meth)acrylate, triallyl cyanurate, triallyl isocyanurate, triallyl trimellitate, diallyl phthalate, diallyl terephthalate, divinyl benzene, methylol(meth)acrylamide, triallylamine, and methylenebis(meth)acrylamide.