Curable isobutylene adhesive copolymers
The disclosure provides pressure-sensitive adhesives and adhesive sealants prepared from alkoxysilane modified, crosslinked isobutylene copolymers, and tape articles prepared therefrom. The adhesive is particularly useful in bonding optical displays.
1. An article comprising:
an optically clear first substrate having an electro-conductive trace;
an optically clear pressure sensitive adhesive disposed on the first substrate and in contact with the trace, the adhesive comprising
a) a substituted isobutylene copolymer of the formula:
wherein a is at least 20, b is at least 1 and c may be zero;
R 1 is H or CH 3 ;
R 2 is a multivalent saturated or unsaturated alkylene or arylene, each R 3 is an alkyl group or aryl group, x is 1 to 3, and q is 1 or 2, and
b) a tackifier.
2. The article of claim 1 , further comprising an optically clear second substrate disposed on the adhesive.
3. The article of claim 2 , wherein the first and second substrates are selected from the group consisting of plastic, polymeric film, and glass.
4. The article of claim 2 , integrated into an electronic device selected from the group consisting of LCD panel, cell phone, hand held device, and a laptop computer.
5. The article of claim 2 where the electroconductive trace is selected from indium-tin oxide, gold, silver, copper or aluminum.
6. The article of claim 1 wherein the isobutylene copolymer comprises greater than 0% by weight but less than 20% by weight of polymerized monomer units having pendent alkoxysilane groups.
7. The article of claim 1 wherein the adhesive comprises 1 to 50 wt. % tackifier, relative to the total weight of the composition.
8. The article of claim 1 wherein the adhesive further comprises a non-functionalized poly(isobutylene) polymer.
9. The article of claim 8 wherein the adhesive comprises:
a) greater than 30 wt. % isobutylene copolymer having pendent alkoxysilane groups;
b) 1 to 50 wt. % of tackifier; and
c) 10 to 50 wt. % non-functional isobutylene (co)polymers.
10. A method of making an article of claim 1 comprising the steps of:
providing an optically clear first substrate having an electro-conductive trace;
providing the pressure sensitive adhesive of claim 1 ; and
laminating the pressure sensitive adhesive to the first substrate such that the optically clear adhesive is in contact with the electro-conductive trace, wherein the adhesive comprises
a) a substituted isobutylene copolymer of the formula:
wherein a is at least 20, b is at least 1 and c may be zero;
R 1 is H or CH 3 ;
R 2 is a multivalent saturated or unsaturated alkylene or arylene, each R 3 is an alkyl group or aryl group, x is 1 to 3, and q is 1 or 2, and
b) a tackifier.
11. The method of claim 10 where the electroconductive trace is selected from indium-tin oxide, gold, silver, copper or aluminum.