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1. WO2017136188 - ADHESIVE COMPOSITIONS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

WE CLAIM:

1. An adhesive composition comprising:

(a) a polydiorganosiloxane polyoxamide copolymer and a silicate tackifying resin in an amount of between about 0.1 wt% and about 20 wt%; or

(b) a silicone polyurea block copolymer and a silicate tackifying resin in an amount of between about 0.1 wt% and about 30 wt%.

2. The adhesive composition of claim 1, wherein the adhesive composition is a pressure sensitive adhesive.

3. The adhesive composition of claim 1, wherein the adhesive composition is a heat activated adhesive.

4. The adhesive composition of claim 1, wherein each R1 is methyl and R3 is hydrogen.

5. The adhesive composition of claim 1, wherein the copolymer has a first repeat unit where p is equal to 1 and a second repeat unit where p is at least 2.

6. The adhesive composition of claim 1, wherein G is an alkylene, heteroalkylene, arylene, aralkylene, polydiorganosiloxane, or a combination thereof.

7. The adhesive composition of claim 1, wherein Y is an alkylene.

8. The adhesive composition of claim 1, wherein n is an integer of 40 to 500.

9. The adhesive composition of claim 1, wherein the silicate tackifying resin is an MQ silicate tackifying resin.

10. The adhesive composition of claim 1, wherein the tackifier is present in an amount of between about 5 weight percent and about 15 weight percent based on the weight of the adhesive composition.

1 1. An article comprising:

a substrate; and

an adhesive layer adjacent to at least one surface of the substrate, the adhesive layer comprising at least one of

(a) a polydiorganosiloxane polyoxamide copolymer and a silicate tackifying resin in an amount of between about 0.1 wt% and about 20 wt%; or

(b) a silicone polyurea block copolymer and a silicate tackifying resin in an amount of between about 0.1 wt% and about 30 wt%.

12. The article of claim 11, wherein the adhesive layer is a heat activated adhesive.

13. The article of claim 11, wherein the adhesive layer is a pressure sensitive adhesive.

14. The article of claim 1 1, wherein each R1 is methyl and R3 is hydrogen.

15. The article of claim 1 1, wherein the silicate tackifying resin comprises a MQ silicate tackifying resin.

16. The article of claim 1 1, having a peel adhesion between about 0.5 oz/in and about 120 oz/in and shear of between at least about 1500 minutes.

17. A method of preparing an adhesive article, the method comprising:

providing an adhesive composition of any of claims 1- 16; and

applying the adhesive composition to a surface of a substrate.

18. The method of claim 17, further comprising removing a release liner to provide an adhesive layer having a microstructured surface.

19. The method of claim 17, wherein the polydiorganosiloxane polyoxamide copolymer is the reaction product of

i) a precursor of Formula II


II

wherein each R2 is independently an alkyl, haloalkyl, aryl, or aryl substituted with an alkyl, alkoxy, halo, or alkoxy carbonyl; and

ii) a diamine of formula R3HN-G-NHR3

wherein

G is a divalent residue unit equal to the diamine minus the two -NHR3 groups; and

R3 is hydrogen or alkyl or R3 taken together with G and with the nitrogen to which they are both attached forms a heterocyclic group.

20. The method of claim 19, wherein the diamine is of formula H2N-G-NH2 and G comprises an alkylene, heteroalkylene, arylene, aralkylene, polydiorganosiloxane, or a combination thereof.