Silicone compositions containing acrylate cure accelerator
Compositions are disclosed which include between about 0.05 to about 5 or less wt. % of at least one acrylate monomer based on the total weight of the composition. The acrylate monomer reduces the peak cure temperature, thereby accelerating the rate of cure, without sacrificing completeness of the cure or the release performance of the cured product. The addition of the acrylate monomer also enables a reduction in the amount of costly platinum catalyst required to effectively cure a composition. In addition to the acrylate monomer, the compositions also include a silicone base polymer, a crosslinking agent, and platinum catalyst. The cured compositions exhibit properties useful for incorporation into release liners, adhesive articles, medical products and gaskets.
1. An adhesive article comprising: a) a substrate; b) an adhesive disposed on the substrate; c) a release liner of comprising a first surface; d) a cured form of a composition disposed on a portion of the first surface of the liner, the cured form of a composition comprising:
i. a silicone base polymer;
ii. an acrylate cure accelerator present in an amount between about 0.05 to about 1 wt. % based on the total weight of the composition;
iii. a catalyst present in the range of between about 10 ppm to about 40 ppm of the total weight of the composition,
wherein after exposing the composition to a temperature in the range of 90° C. to about 120° C. for a time period in the range of about 2 seconds to about 8 seconds, the composition is cured 95% or more to form the cured form of the composition,
wherein the cured composition of the release liner is in contact with the adhesive.
2. The adhesive article of claim 1 , wherein the silicone base polymer is a vinyl functional silicone base polymer.
3. The adhesive article of claim 1 , wherein the silicone base polymer is present from between about 50 wt. % to about 95 wt. % of the total weight of the composition.
4. The adhesive article of claim 1 , further comprising an O-vinyl ether compound.
5. The adhesive article of claim 4 , wherein the O-vinyl ether compound is selected from the group consisting of 1,4 cyclohexanedimethanol divinyl ether, butanedioldivinylether, and dodecylvinylether.
6. The adhesive article of claim 4 , wherein the O-vinyl ether compound is present from between about 0.01 wt. % to about 10 wt. % of the total weight of the composition.
7. The adhesive article of claim 1 , wherein the acrylate cure accelerator is selected from the group consisting of a mono-, di-, tri-, and multifunctional acrylate.
8. The adhesive article of claim 7 , wherein the acrylate cure accelerator is selected from the group consisting of hexane diol diacrylate, tricyclodecanediol diacrylate, isobornyl acrylate, octyl/decyl acrylate, silicone diacrylate, silicone hexaacrylate, 3-acryloxypropyl trimethoxysilane, and trimethylolpropane triacrylate.
9. The adhesive article of claim 1 , wherein the acrylate cure accelerator is a hydrophilic acrylate monomer.
10. The adhesive article of claim 1 , further comprising a crosslinking agent comprising a silicone hydride functional group.
11. The adhesive article of claim 1 , further comprising a controlled release agent, the controlled release agent is present in an amount of less than 50 wt. % of the total weight of the composition.
12. The adhesive article of claim 1 , wherein the catalyst comprises platinum.
13. The adhesive article of claim 12 , wherein the catalyst is present at about 35 ppm or less of the total weight of the composition.
14. The adhesive article of claim 1 , wherein the time period for curing the composition is in the range of about 1 second to about 5 seconds and the temperature for curing the composition is in the range of about 100° C. to about 130115° C.
15. The adhesive article of claim 1 , wherein the modulus (G′) of the composition after curing is 1×10 6 Pascals or more measured at a temperature of about 120° C. and wherein the loss factor (tan.delta.) of the composition after curing is less than 0.01 measured at a temperature of about 120° C.
16. The adhesive article of claim 1 , wherein the acrylate cure accelerator is the sole cure accelerator present in the composition.
17. The adhesive article of claim 1 , wherein the liner is selected from the group consisting of a polymer film, a plastic film, and a paper liner.
18. The adhesive article of claim 1 , wherein the substrate is selected from the group consisting of a polymeric film, paper, and combinations thereof.
19. The adhesive article of claim 1 , wherein the adhesive is a pressure sensitive adhesive.
20. The adhesive article of claim 1 , wherein the acrylate cure accelerator is a mono-functional acrylate cure accelerator.