Pressure sensitive adhesive compositions and articles prepared using such compositions

1. A high impact resistant article comprising a breakable substrate bonded to a flexible substrate,

wherein the breakable substrate is bonded to the flexible substrate using a pressure sensitive adhesive prepared by combining a nonsilylated acrylic polymer and a silane-functional polymer,

wherein the silane-functional polymer is a silane-terminated polyurethane prepared from polyoxyalkylene diol, polyoxyalkylene triol, polycaprolactone diol or polycaprolactone triols; and said silane-terminated polyurethane has a glass transition temperature of below −20° C.

2. The article of claim 1 wherein the silane-functional polymer is a polymer that contains —Si(C x H 2x+1 ) n (OC y H 2y+1 ) 3−n end groups where n is 0, 1 or 2, and x and y are independently integral numbers from 0 to 12.

3. The article of claim 1 wherein the silane-terminated polyurethane is prepared from polyoxyalkylene diol.

4. The article of claim 3 wherein the polyoxyalkylene diol is selected from the group consisting of polyethylene glycol, polytetramethylene glycol and polypropylene glycol.

5. The article of claim 1 wherein the breakable substrate is a glass substrate.

6. The article of claim 5 comprising a glass substrate bonded to a plastic film.

7. The article of claim 6 where the plastic film is a plastic laminate.

8. The article of claim 6 wherein the plastic film is sandwiched between two glass substrates.

9. The article of claim 6 which is an impact resistant window, door or display case.

10. The article of claim 1 wherein the pressure sensitive adhesive comprises a silane-functional polymer has a glass transition temperature of below −50° C.

11. The article of claim 1 wherein the acrylic polymer is a pressure sensitive nonsilylated acrylic polymer.

12. The article of claim 1 wherein the pressure sensitive adhesive comprises an acrylic polymer prepared from monomers comprising

(i) acrylate monomers, homopolymers of which have a glass transition temperature less than 0° C., which acrylate monomers contain from about 4 to about 18 carbon atoms in the alkyl group and

(ii) monomers, homopolymers of which have a glass transition temperature greater than 0° C.

13. The article of claim 12 wherein the monomers used to prepare the acrylic polymer comprise acid functional monomers and/or hydroxy functional monomers.

14. The article of claim 13 wherein the pressure sensitive adhesive comprises an acrylic polymer prepared from 2-ethyl hexyl acrylate, acrylic acid, and vinyl acetate or methyl acrylate.

15. A pressure sensitive adhesive prepared by combining an acrylic polymer and a silane-functional polymer

wherein the silane-functional polymer is a polyurethane prepared from polyoxyalkylene diol, polyoxyalkylene triol, polycaprolactone diol or polycaprolactone triol; and said silane-terminated polyurethane has a glass transition temperature of below −20° C. and contains

—Si(C x H 2x+1 ) n (OC y H 2y+1 ) 3−n end groups where n is 0, 1 or 2, and x and y are independently integral numbers from 0 to 12 and

wherein the acrylic polymer contains no silyl functional groups.

16. A pressure sensitive adhesive prepared by combining a nonsilylated acrylic polymer and a silane functional polymer wherein the silane functional polymer is a silane-terminated polyurethane prepared from polyoxyalkylene diol, polyoxyalkylene triol, polycaprolactone diol or polycaprolactone triol; and silane-terminated polyurethane has a glass transition temperature of below −20° C.

17. The adhesive of claim 16 wherein the silane-functional polymer has a glass transition temperature of below −50° C.

18. A pressure sensitive adhesive article comprising the adhesive of claim 16 .

19. The article of claim 18 which is a tape, film or label.

20. The adhesive of claim 15 wherein the silane-functional polymer has a glass transition temperature of below −50° C.

21. A pressure sensitive adhesive article comprising the adhesive of claim 15 .