Method for preparing a pressure sensitive adhesive formulation including an enhanced polyisobutylene modifier
View Patent ↗A method for preparing an improved pressure sensitive adhesive includes incorporating into a base polymer, an PIB modifier that is made up of a homopolymer of isobutylene wherein a predominant portion of the double bonds are in either an alpha position or a beta position. The modifier may function as a plasticizer, a tackifier extender or a combination plasticizer and tackifier extender for the pressure sensitive adhesive.
1. A method for preparing a pressure sensitive adhesive having improved properties comprising providing a pressure sensitive adhesive base structure and including in said base structure a PIB modifier, said PIB modifier comprising a homopolymer of isobutylene wherein a predominant portion of the double bonds are in either an alpha position or a beta position.
2. A method as set forth in claim 1 , wherein said PIB modifier has a polydispersity no greater than about 2.2.
3. A method as set forth in claim 1 , wherein said PIB modifier has a M N no greater than about 3000.
4. A method as set forth in claim 3 , wherein said PIB modifier has a M N which is at least about 900.
5. A method as set forth in claim 1 , wherein at least about 92% of the monomeric units incorporated in the PIB modifier molecules are isobutylene moieties.
6. A method as set forth in claim 1 , wherein at least about 95% of the monomeric units incorporated in the PIB modifier molecules are isobutylene moieties.
7. A method as set forth in claim 1 , wherein at least about 99% of the monomeric units incorporated in the PIB modifier molecules are isobutylene moieties.
8. A method as set forth in claim 1 , wherein no more than about 1% of the monomeric units incorporated in the PIB modifier molecules are something other than isobutylene moieties.
9. A method as set forth in claim 1 , wherein at least about 40% of the double bonds of the PIB modifier molecules are in the alpha position.
10. A method as set forth in claim 1 , wherein at least about 50% of the double bonds of the PIB modifier molecules are in the alpha position.
11. A method as set forth in claim 1 , wherein at least about 60% of the double bonds of the PIB modifier molecules are in the alpha position.
12. A method as set forth in claim 1 , wherein at least about 70% of the double bonds of the PIB modifier molecules are in the alpha position.
13. A method as set forth in claim 1 , wherein at least about 80% of the double bonds of the PIB modifier molecules are in the alpha position.
14. A method as set forth in claim 1 , wherein at least about 90% of the double bonds of the PIB modifier molecules are in the alpha position.
15. A method as set forth in claim 1 , wherein more than 90% of the double bonds of the PIB modifier molecules are in the alpha position.
16. A method as set forth in claim 1 wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
17. A method as set forth in claim 9 wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
18. A method as set forth in claim 10 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
19. A method as set forth in claim 11 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
20. A method as set forth in claim 12 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
21. A method as set forth in claim 13 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
22. A method as set forth in claim 14 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
23. A method as set forth in claim 15 , wherein no more than about 1% of the double bonds of the PIB modifier molecules are in a position other than the alpha or beta.
24. A method as set forth in claim 1 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
25. A method as set forth in claim 2 wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
26. A method as set forth in claim 3 wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
27. A method as set forth in claim 6 wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
28. A method as set forth in claim 7 wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
29. A method as set forth in claim 10 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
30. A method as set forth in claim 11 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
31. A method as set forth in claim 12 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
32. A method as set forth in claim 13 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
33. A method as set forth in claim 14 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
34. A method as set forth in claim 15 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.
35. A method as set forth in claim 16 , wherein from about 10 to about 60% by weight of said PIB modifier is included in said pressure sensitive adhesive.