Process for improving water-whitening resistance of pressure...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 220/18 (2006.01) C09J 133/06 (2006.01)

Patent

CA 2452882

Pressure sensitive adhesive compositions having enhanced resistance to water- whitening comprising an aqueous emulsion polymer are disclosed. The polymer comprises the polymerization reaction product of a polymerizable aqueous emulsion comprising: (i) at least one hydrophobic alkyl acrylate or alkyl methacrylate ester of an alcohol, (ii) at least about 1 Wt. % of at least one hydrophilic monomer, (iii) at least about 5 wt. % of at least one partially hydrophilic alkyl acrylate or alkyl methacrylate ester of an alcohol, and (iv) a water-soluble or water-dispersible polymerizable surfactant selected from compounds having a terminal allyl amine moiety, substituted phenyl compounds having at least one alkenyl substituent, polyoxyalkylene-1- (allyloxymethyl) alkyl ether sulfate salts, or mixtures thereof, and the average particle size of the polymer is less than or equal to 200 nm. Also disclosed are processes for preparing same.

Cette invention porte sur des compositions adhésives autocollantes présentant une résistance renforcée au blanchiment par l'eau et contenant un polymère en émulsion aqueuse. Ce polymère comprend le produit d'une réaction de polymérisation d'une émulsion aqueuse polymérisable renfermant : (i) au moins un acrylate d'alkyle hydrophobe ou un ester méthacrylate d'alkyle d'un alcool ; (ii) au moins environ 1 % en poids d'au moins un monomère hydrophile ; (iii) au moins environ 5 % en poids d'au moins un acrylate d'alkyle partiellement hydrophile ou d'un ester méthacrylate d'alkyle d'un alcool ; et (iv) un surfactant polymérisable soluble dans l'eau ou hydrodispersable sélectionné parmi des composés comportant un groupe fonctionnel amine allylique terminal, des composés phényl substitués comportant au moins un substituant alcényle, des sels polyoxyalkylène-1-(allyloxyméthyl) de sulfate d'éther alcoylique ou des mélanges de ces composés, la dimension moyenne des particules du polymère étant inférieure ou égale à 200 nm. Cette invention concerne également des procédés de préparation de ces compositions.

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