Patent ID: 7339002
Filing Date: 2008-03-04
Classification: C08F,C08L,C09J

Abstract:
1. A removable, water-whitening resistant pressure sensitive adhesive comprising a crosslinked aqueous emulsion polymer comprising: (a) at least one hydrophobic monomer selected from an alkyl (meth)acrylate ester of an alcohol wherein the alkyl portion of the alcohol is linear or branched and contains at least 4 carbon atoms, or a mixture of at least one styrenic monomer and at least one alkyl (meth)acrylate ester of an alcohol wherein the alkyl portion of the alcohol is linear or branched and contains at least 4 carbon atoms, wherein when a styrenic monomer is present, said styrenic monomer is present in an amount up to about 30 wt. % of the total hydrophobic monomer mixture; (b) at least about 2 wt. % of at least one hydrophilic monomer; (c) at least about 5 wt. % of at least one partially hydrophilic monomer selected from alkyl (meth)acrylate esters of an alcohol wherein the alkyl portion of the alcohol has 1 to 2 carbon atoms, N-vinyl-2-pyrrolidone, or mixtures thereof; and (d) at least one polymerizable surfactant, wherein said crosslinked aqueous emulsion polymer is crosslinked with pentaerythritol tris[([β]-N-aziridinyl)propionate], and the wt. % of monomers (a), (b), and (c) are based on the total weight of monomers (a), (b), and (c) and wherein said removable, water-whitening resistant pressure sensitive adhesive has a peel strength of less than about 2.0 pounds per inch peel force with adhesive failure mode when applied to PET film.