Optically clear pressure sensitive adhesives and uses thereof

1. An optically clear adhesive composition comprising:

(a) about 85 to about 99.7% of a thermal curable silicone pressure sensitive adhesive comprising:

(i) about 94.5% to about 99.998% vinyl functional silicone;

(ii) about 0.001 to about 5% of a hydride functional siloxane polymer or oligomer; and

(iii) about 0.001 to about 0.5% of a Pt catalyst; and

(b) about 0.3-15% of a mixture of UV absorbers comprising:

(i) about 0.1 to about 5% hydroxyphenyl benzotriazole or its derivatives;

(ii) about 0.1 to 5% % benzophenone or its derivatives; and

(iii) about 0.1-5% % hindered amine light stabilizer

wherein the optically clear adhesive composition has a percent transmittance (% T) of less than 10% at less than 380 nm and greater than 90% at greater than 410 nm, measured in accordance with ASTM E903.

2. The optically clear adhesive composition of claim 1 , wherein the (a) thermal curable silicone pressure sensitive adhesive composition comprises:

(i) the vinyl functional silicone is a mixture and/or a reaction product of polydimethylsiloxane polymers, silicone resins, and silanes that contain one or more vinyl functional group,

(ii) the hydride functional siloxane polymer (ii) is a polydimethylsiloxane polymer or oligomer with terminal functional groups of SiMe 2 H, or with pedant functional groups of SiMeH, or mixtures thereof, and the average weight molecular weight of from about 400 to 100,000 g/mol, and

(iii) the Pt catalyst is Speier's catalyst H 2 PtCl 6 , Karstedt's catalyst, or alkene-stabilized platinum (0).

3. An optically clear adhesive composition comprising:

(a) about 85 to about 99.7% a UV curable silicone pressure sensitive adhesive, comprising:

(i) about 99.5% to about 99.999% (meth)acryloxy functional silicone and

(ii) about 0.001 to about 0.5% of a photoinitiator catalyst and

(b) about 0.3-15% of a mixture of UV absorbers comprising:

(i) about 0.1 to about 5% hydroxyphenyl benzotriazole or its derivatives;

(ii) about 0.1 to 5% % benzophenone or its derivatives; and

(iii) about 0.1-5% % hindered amine light stabilizer

wherein the optically clear adhesive composition has a percent transmittance (% T) of less than 10% at less than 380 nm and greater than 90% at greater than 410 nm, measured in accordance with ASTM E903.

4. The optically clear adhesive composition of claim 2 , wherein the (meth)acryloxy functional silicone is a mixture and/or a reaction product of polydimethylsiloxane polymers, silicone resins, and silanes or/and siloxane polymers that contain one or more (meth)acryloxy functional group.

5. An optically clear adhesive composition comprising:

(a) about 85 to about 99.7% of a UV curable polyisobutylene-based pressure sensitive adhesive composition comprising:

(i) about 1 to about 30% of a (meth)acrylate monomer, a (meth)acrylate oligomer or mixtures thereof;

(ii) about 10 to about 90% a polyisobutylene polymer

(iii) about 5% to about 50% a liquid diluent, a tackifier, or mixtures thereo;

and

(iv) about 0.001 to 5% a photoinitiator and

(b) about 0.3-15% of a mixture of UV absorbers comprising:

(i) about 0.1 to about 5% hydroxyphenyl benzotriazole or its derivatives;

(ii) about 0.1 to 5% benzophenone or its derivatives; and

(iii) about 0.1-5% % hindered amine light stabilizer

wherein the optically clear adhesive composition has a percent transmittance (% T) of less than 10% at less than 380 nm and greater than 90% at greater than 410 nm, measured in accordance with ASTM E903.

6. The optically clear adhesive composition of claim 5 ,

(i) wherein the (meth)acrylate monomer is a mono or multifunctional (meth)acrylic monomers,

(ii) wherein the (meth)acrylate oligomer is a (meth)acrylic functionalized polyisobutylene, polybutadiene, hydrogenated polybutadiene, or a polyolefin having greater than one (meth)acrylic functional group per molecule, wherein the reactive functional group is selected from the group consisting of terminal methacrylates, pendant methacrylates, terminal acrylates, and/or pendant acrylates; and mixtures thereof, wherein the (meth)acrylate oligomer or mixtures thereof have a weight average molecular weight (Mw) of from about 1000 to about 95,000 g/mol, and

(iii) the liquid diluent is mineral oil, a wax, polyisobutylene, polybutene, or a synthetic liquid polymer.

7. An optically clear adhesive composition comprising:

(a) about 85 to about 99.7% of a UV curable styrenic block copolymer-based pressure sensitive adhesive comprising:

(i) about 5% to about 30% of a (meth)acrylate monomer, or a (meth)acrylate oligomer, or mixtures thereof;

(ii) about 5% to about 30% a styrenic block copolymer having fully hydrogenated and saturated soft blocks;

(iii) about 55% to about 79.99% a liquid diluent, a tackifier, or mixtures thereof; and

(iv) about 0.01% to about 5% a photoinitiator; and

(b) about 0.3-15% of a mixture of UV absorbers comprising:

(i) about 0.1 to about 5% hydroxyphenyl benzotriazole or its derivatives;

(ii) about 0.1 to 5% % benzophenone or its derivatives; and

(iii) about 0.1-5% % hindered amine light stabilizer;

wherein the optically clear adhesive composition has a percent transmittance (% T) of less than 10% at less than 380 nm and greater than 90% at greater than 410 nm, measured in accordance with ASTM E903.

8. The optically clear adhesive composition of claim 7 , wherein the styrenic block copolymer is fully hydrogenated, having saturated soft blocks, wherein the soft block are selected from the groups consisting of ethylene, propylene, butylene, isobutylene, ethylene-propylene, ethylene-butylene, and mixtures thereof.

9. The optically clear adhesive composition of claim 8 , wherein the styrenic block copolymer is a triblock, a diblock, or mixtures thereof.

10. An article comprising the optically clear adhesive composition of claim 1 .

11. A method of making an optically clear adhesive film comprising the steps of:

(1) preparing a curable optically clear adhesive claim 1 in an organic solvent;

(2) coating the curable optically clear adhesive solution onto a first release-liner;

(3) evaporating the organic solvent to form a substantially solvent-free film at a temperature of about 60 to about 150° C.; and

(4) laminating a second release-liner onto the substantially solvent-free film.

12. The method of making the optically clear adhesive film of claim 11 , further comprising the step of:

(5) irradiating the substantially solvent-free film to UV light at 250-410 nm with a dosage of UVA&V 1-5 J/cm 2 .

13. An article comprising the optically clear adhesive composition of claim 2 .

14. An article comprising the optically clear adhesive composition of claim 3 .

15. An article comprising the optically clear adhesive composition of claim 5 .