Resin composition comprising a phosphorous containing surfactant for pressure sensitive adhesives

1. A resin composition comprising a tackifying resin and at least one phosphorous containing surfactant comprising a polyoxyalkylene group terminating in a branched group selected from the group consisting of branched alkyl and branched alkenyl groups and mixtures thereof.

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 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.

6. A resin composition according to claim 1 wherein the tackifying resin is selected from the group consisting of rosins, tackifying resin derivatives of rosins, hydrocarbon resins and mixtures thereof.

7. A pressure sensitive adhesive comprising a tackifying resin and at least one phosphorous containing surfactant comprising a polyoxyalkylene group terminating in a branched group selected from the group consisting of branched alkyl and branched alkenyl groups and mixtures thereof.

8. A resin composition comprising a tackifying resin and at least one phosphorous containing surfactant comprising a polyoxyalkylene group terminating in a branched group selected from the group consisting of branched alkyl and branched alkenyl groups and mixtures thereof, wherein the branched group comprises in the range from 1.5 to 6 side-branches on average by number.

9. A resin composition according to claim 8 wherein the at least one phosphorous containing surfactant is at least one phosphate ester and the branched group is an alkyl group comprising in the range from 8 to 20 carbon atoms.

10. A resin composition according to claim 8 wherein at least one side-branch comprises in the range from 1 to 3 carbon atoms.

11. A resin composition according to claim 10 wherein greater than 50% by number of the side-branches are methyl groups.

12. A resin composition according to claim 8 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.

13. A resin composition according to claim 8 wherein the tackifying resin is selected from the group consisting of rosin, tackifying resin derivatives of rosins, hydrocarbon resins and mixtures thereof.