Process for preparing hot water whitening resistant emulsion...

C - Chemistry – Metallurgy – 09 – J

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C09J 133/08 (2006.01) C08F 2/30 (2006.01) C09J 11/04 (2006.01)

Patent

CA 2232713

There is provided clear emulsion acrylic pressure sensitive adhesive polymers which resist water whitening by hot water which are formed by copolymerizing a monomer mixture containing at least one alkyl acrylate ester of an alcohol containing at least 4 carbon atoms, at least one polar comonomer and at least one partially water soluble comonomer present in an amount of at least about 7 % by weight of total monomers. Polymerization is in the presence of at least one nonionic surfactant containing at least about 8 moles of ethylene oxide per mole nonionic surfactant and at least one anionic surfactant containing up to about 10 moles ethylene oxide per mole anionic surfactant. There is added to the product of polymerization at least one base to produce an emulsion having a pH greater than 7 and containing particles having an volume average particle diameter up to about 165 nm as determined by laser light scattering. An electrolyte is post polymerization added to stabilize opacity of adhesive films cast from the emulsion.

L'invention porte sur des polymères adhésifs autocollants acryliques obtenus par une émulsion claire, résistants au blanchiment par eau chaude, et obtenus par polymérisation d'un mélange monomère contenant au moins un ester d'acrylate alkyle d'un alcool contenant au moins 4 atomes de carbone, au moins un comonomère polaire et au moins un comonomère partiellement soluble dans l'eau, en quantité supérieure ou égale à environ 7 % en poids du total des monomères. La polymérisation se fait en présence d'au moins un tensioactif non ionique contenant au moins 8 moles environ d'oxyde éthylénique par mole de tensioactif non ionique, et au moins un tensioactif anionique contenant jusqu'à environ 10 moles d'oxyde éthylénique par mole de tensioactif anionique. On ajoute au produit de la polymérisation au moins une base pour produire une émulsion ayant un pH supérieur à 7 et contenant des particules ayant un diamètre volumique moyen pouvant atteindre environ 165 nm, en fonction d'une dispersion au faisceau laser. Un électrolyte est ajouté après la polymérisation pour stabiliser l'opacité des films adhésifs coulés à partir de l'émulsion.

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