Resin composition comprising a phosphorous containing surfactant for pressure sensitive adhesives

Abstract

A resin composition contains a tackifying resin and at least one phosphorous containing surfactant having branched alkyl and/or alkenyl group and a polyoxyalkylene group. The resin composition is particularly suitable for use in pressure sensitive adhesives.

1 . A resin composition comprising a tackifying resin and at least one phosphorous containing surfactant comprising a branched alkyl and/or alkenyl group and a polyoxyalkylene group.  
     
     
         2 . A resin composition according to  claim 1  wherein the at least one phosphorous containing surfactant is at least one phosphate ester.  
     
     
         3 . A resin composition according to  claim 1  wherein the branched group is an alkyl group comprising in the range from 8 to 20 carbon atoms.  
     
     
         4 . A resin composition according to  claim 1  wherein the longest linear chain of the branched alkyl and/or alkenyl group comprises in the range from 7 to 12 carbon atoms.  
     
     
         5 . A resin composition according to  claim 1  where the branched alkyl and/or alkenyl group comprises int eh range from 1.6 to 6 side-branches on average by number.  
     
     
         6 . A resin composition according to  claim 5  wherein at least one side-branch comprises in the range from 1 to 3 carbon atoms.  
     
     
         7 . A resin composition according to  claim 6  wherein greater than 50% by number of the side-branches are methyl groups.  
     
     
         8 . A resin composition according to  claim 1  wherein the polyoxyalkylene group is of the formula (C m H 2m O) n  wherein m is 2, 3 or 4, and n is in the range from 5 to 15.  
     
     
         9 . A resin composition according to  claim 1  wherein the tackifying resin is a rosin and/or derivatives thereof, and/or a hydrocarbon resin.  
     
     
         10 . A pressure sensitive adhesive comprising a tackifying resin and at least one phosphorous containing surfactant comprising a branched alkyl and/or alkenyl group and a polyoxyalkylene group.