Pressure-sensitive adhesive sheet for application to skin
View Patent ↗The problem of the present invention is to provide a pressure-sensitive adhesive sheet for skin adhesion, having an adhesive layer, which can be formed without using an organic solvent, shows superior adhesion performance to the skin, and shows extremely mild irritation to the skin and stratum corneum damage. To solve the problem, the present invention provides a pressure-sensitive adhesive sheet for skin adhesion, which has a substrate and an adhesive layer laminated on the substrate, wherein the adhesive layer is obtained by curing an adhesive composition containing polyether polymer (A) having at least one alkenyl group on the terminal, compound (B) having 1-10 hydrosilyl groups in a molecule and hydrosilylation catalyst (C).
1. A pressure-sensitive adhesive sheet for skin adhesion, which comprises a substrate and an adhesive layer laminated on the substrate, wherein the adhesive layer is obtained by curing an adhesive composition comprising polyether polymer (A) having a number average molecular weight of 10000-30000 and at least one alkenyl group on the terminal, compound (B) having a number average molecular weight of 500-1000 and 1-10 hydrosilyl groups in a molecule and hydrosilylation catalyst (C), and the molar ratio of the hydrosilyl group/alkenyl group is 0.3-0.8.
2. The pressure-sensitive adhesive sheet of claim 1 , wherein the polymer (A) is a polyether polymer having an alkenyl group represented by the following formula (1) or (2),
H 2 C═C(R 1 )— (1)
HC(R 1 )═CH— (2)
wherein R 1 is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the catalyst (C) is a platinum complex that does not contain a conjugate base of a strong acid as a ligand.
3. The pressure-sensitive adhesive sheet of claim 2 , wherein R 1 is a hydrogen atom or a methyl group.
4. The pressure-sensitive adhesive sheet of claim 2 , wherein the platinum complex is a platinum-vinyl siloxane complex.
5. The pressure-sensitive adhesive sheet of claim 4 , wherein the platinum-vinyl siloxane complex is a platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex or a platinum-1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane complex.
6. The pressure-sensitive adhesive sheet of claim 1 , wherein the main chain of the polymer (A) has a polyoxypropylene skeleton.
7. The pressure-sensitive adhesive sheet of claim 1 , wherein the polymer (A) has a number average molecular weight in polystyrene conversion of 3000-50000 as measured by size-exclusion chromatography.
8. The pressure-sensitive adhesive sheet of claim 1 , wherein the proportion of the toluene-insoluble component in the adhesive layer is 10-50 wt %.
9. The pressure-sensitive adhesive sheet of claim 1 , which has a moisture permeability of not less than 800 g/m 2 ·24 hr, as measured under the conditions of thickness of adhesive layer 50 μm, temperature 40° C. and relative humidity 30%.
10. The pressure-sensitive adhesive sheet of claim 3 , wherein the platinum complex is a platinum-vinyl siloxane complex.
11. The pressure-sensitive adhesive sheet of claim 10 , wherein the platinum-vinyl siloxane complex is a platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex or a platinum-1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane complex.