Silicone pressure-sensitive adhesive and silicone pressure-sensitive adhesive composition

1. A silicone pressure-sensitive adhesive, comprising a reaction product of a composition comprising:

a silanol end group-containing linear organopolysiloxane;

a non-functional linear organopolysiloxane; and

a silicate resin,

wherein the molar equivalent of silanol groups in the silicate resin is greater than the molar equivalent of silanol groups in the silanol end group-containing linear organopolysiloxane, such that unreacted silicate resin remains after a condensation reaction between the silanol end group-containing linear organopolysiloxane and the silicate resin, and wherein the dynamic viscosity of the non-functional linear organopolysiloxane at 25° C. is 100,000 mm 2 /sec or greater.

2. A silicone pressure-sensitive adhesive, comprising a cured product of a composition comprising:

an end-capped linear organopolysiloxane with a silicate resin, which is a condensation product of a silanol end group-containing linear organopolysiloxane and a silicate resin;

a non-functional linear organopolysiloxane; and

a silicate resin, wherein the silicate resin is contained in an amount from 30 to 70 parts by weight in the silicone pressure-sensitive adhesive based on 100 parts by weight of the solid content of the silicone pressure-sensitive adhesive,

wherein the dynamic viscosity of the non-functional linear organopolysiloxane at 25° C. is 100,000 mm 2 /sec or greater.

3. The silicone pressure-sensitive adhesive according to claim 2 , wherein the silanol end group-containing linear organopolysiloxane is represented by Formula (1):

where in Formula (1), each R 1 and R 2 is independently an aliphatic hydrocarbon group having 1 to 6 carbon atoms or a phenyl group; a plurality of R 1 s are identical or different from each other; a plurality of R e s are identical or different from each other; and n is an integer of 1 or greater.

4. The silicone pressure-sensitive adhesive according to claim 2 , wherein the non-functional linear organopolysiloxane is represented by Formula (2):

where in Formula (2), each R 3 , R 4 and R 5 is independently an alkyl group having 1 to 6 carbon atoms or a phenyl group; a plurality of R 3 s are identical or different from each other; a plurality of R 4 s are identical or different from each other; a plurality of R 5 s are identical or different from each other; and n is an integer of 1 or greater.

5. The silicone pressure-sensitive adhesive according to claim 2 , wherein the silanol end group-containing linear organopolysiloxane is a silanol end group-containing linear polydimethylsiloxane.

6. The silicone pressure-sensitive adhesive according to claim 2 , wherein the non-functional linear organopolysiloxane is a trimethylsilyl end group-containing linear polydimethylsiloxane.

7. The silicone pressure-sensitive adhesive according to claim 2 , wherein the silicate resin is an MQ resin.

8. The silicone pressure-sensitive adhesive according to claim 2 , wherein the non-functional linear organopolysiloxane is cross-linked via its organic side chain group.

9. The silicone pressure-sensitive adhesive according to claim 2 , wherein the silicone pressure-sensitive adhesive is essentially free of a residue of a catalyst and a reaction initiator.

10. The silicone pressure-sensitive adhesive according to claim 2 , wherein the silicone pressure-sensitive adhesive is a medical sensitive adhesive which is gentle for skin.

11. A silicone pressure-sensitive adhesive composition, comprising:

a silanol end group-containing linear organopolysiloxane;

a non-functional linear organopolysiloxane; and

a silicate resin, wherein the molar equivalent of silanol groups in the silicate resin is greater than the molar equivalent of silanol groups in the silanol end group-containing linear organopolysiloxane, such that unreacted silicate resin remains after a condensation reaction between the silanol end group-containing linear organopolysiloxane and the silicate resin, and wherein the dynamic viscosity of the non-functional linear organopolysiloxane at 25° C. is 100,000 mm 2 /sec or greater.

12. The silicone pressure-sensitive adhesive composition according to claim 11 , wherein the silicate resin is contained in an amount from 30 to 70 parts by weight in the silicone pressure-sensitive adhesive composition based on 100 parts by weight of the solid content of the silicone pressure-sensitive adhesive composition.

13. The silicone pressure-sensitive adhesive composition according to claim 11 , wherein the molar equivalent of a silanol group in the silicate resin is greater than that of a silanol group in the silanol end group-containing linear organopolysiloxane.

14. The silicone pressure-sensitive adhesive composition according to claim 11 , wherein the non-functional linear organopolysiloxane is contained in an amount from 30 to 60 parts by weight in the silicone pressure-sensitive adhesive composition based on 100 parts by weight of the solid content of the silicone pressure-sensitive adhesive composition.

15. The silicone pressure-sensitive adhesive composition according to claim 11 , comprising a linear organopolysiloxane, the end of which being capped with a silicate resin which is a condensation product of the silanol end group-containing linear organopolysiloxane and the silicate resin.

16. The silicone pressure-sensitive adhesive composition according to claim 11 , wherein the silicone pressure-sensitive adhesive composition is essentially free of a catalyst and a reaction initiator.

17. The silicone pressure-sensitive adhesive composition according to claim 11 , further comprising an organohydrogen polysiloxane and a hydrosilylation catalyst, wherein at least one of the silanol end group-containing linear organopolysiloxane and the silicate resin has an alkenyl group.