Moisture curable compositions with enhanced adhesion to polyolefins

1. A moisture curable composition comprising:

(a) alkoxysilyl capped polymer compounds within the following formula:

wherein R is a hydrocarbon diradical which may include heteroatom and/or silicone-containing groups or linkages; A and A′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, with or without interruption by a carboxy, carbamate, carbonate, ureido, urethane or sulfonate linkage; n may be 0 or 1; R 1 and R 2 are C 1-12 alkyl or aryl groups; R 3 is a C 1-12 alkyl, alkenyl, alkoxy, aminoalkyl or aryl group, or a (meth)acryloxyalkyl group;

(b) at least one alkylsilyl capped plasticizer within the following formula:

wherein R′ is a hydrocarbon diradical which optionally includes heteroatom and/or silicone-containing groups or linkages; B and B′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, that are optionally interrupted by a linkage selected from the group consisting of carboxy, carbamate, carbonate, ureido, urethane and sulfonate; m is 0 or 1; R 4 and R 5 are C 1-12 alkyl or aryl groups; R 6 is a C 1-12 alkyl, alkenyl or aryl group;

(c) a filler; and

(d) a moisture curing catalyst.

2. The composition of claim 1 , wherein R is a polyether polymer backbone.

3. The composition of claim 2 , wherein the polymer backbone of the alkoxysilyl capped polymer is a polypropylene oxide.

4. The composition of claim 1 , wherein R 3 is a C 1-12 alkoxy.

5. The composition of claim 1 , wherein R 6 is a C 1-12 alkyl.

6. The composition of claim 1 , wherein R 3 is a C 1-12 alkoxy and R 6 is a C 1-12 alkyl.

7. The composition of claim 1 , wherein R′ is a polyether polymer backbone.

8. The composition of claim 7 , wherein the polymer backbone of the alkylsilyl capped polymer is a polytetramethylene oxide.

9. The composition of claim 1 , wherein the filler is a calcium carbonate filler.

10. The composition of claim 9 , wherein the calcium carbonate filler is present in from about 10 weight percent to about 70 weight percent on a total composition basis.

11. The composition of claim 1 , further comprising an adhesion promoter.

12. The composition of claim 11 , wherein the adhesion promoter is an aminopropyltrimethoxysilane.

13. The composition of claim 1 , further including a non-alkylsilyl capped plasticizer.

14. A moisture curable composition comprising:

(a) an alkoxysilyl capped polymer having a polymer or copolymer backbone selected from the group consisting of polyurethane, silicone, polyamide, polyether, polyester and combinations thereof;

(b) a trialkylsilyl capped polymeric plasticizer having a polymer or copolymer backbone selected from the group consisting of polyurethane, silicone, polyamide, polyether, polyester and combinations thereof;

(c) a filler; and

(d) a moisture curing catalyst

wherein the composition has low temperature adhesion to polyolefin substrates.

15. The composition of claim 14 , wherein the composition has room temperature adhesive to polyethylene or polypropylene substrates.

16. A moisture curable composition comprising:

(a) from about 5 weight percent to about 95 weight percent on a total composition basis of trialkoxysilyl capped polymer compounds of the following structure:

wherein R is a hydrocarbon diradical which may include heteroatom and/or silicone-containing groups or linkages; A and A′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, with or without interruption by a carboxy, carbamate, carbonate, ureido, urethane or sulfonate linkage; n may be 0 or 1; R 1 and R 2 are C 1-12 alkyl or aryl groups; R 3 is a C 1-12 alkoxy group;

(b) from about 5 weight percent to about 35 weight percent on a total composition basis of trialkylsilyl capped polymeric plasticizers of the following structure:

wherein R′ is a hydrocarbon diradical which optionally includes heteroatom and/or silicone-containing groups or linkages; B and B′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, that are optionally interrupted by a linkage selected from the group consisting of carboxy, carbamate, carbonate, ureido, urethane and sulfonate; m is 0 or 1; R 4 and R 5 are substituted or unsubstituted C 1-12 alkyl or aryl groups; R 6 is a C 1-12 alkyl, alkenyl or aryl group;

(c) from about 1 weight percent to about 5 weight percent on a total composition basis of an aminopropyltrimethoxysilane adhesion promoter;

(d) from about 10 weight percent to about 70 weight percent on a total composition basis of a filler; and

(f) a moisture curing catalyst.

17. The composition of claim 16 , wherein the filler is calcium carbonate filler.

18. A method of bonding polyolefin substrates comprising:

(i) selecting a polyolefin substrate;

(ii) selecting a moisture curable composition comprising:

(a) alkoxysilyl capped polymer compounds within the following formula:

wherein R is a hydrocarbon diradical which may include heteroatom and/or silicone-containing groups or linkages; A and A′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, with or without interruption by a carboxy, carbamate, carbonate, ureido, urethane or sulfonate linkage; n may be 0 or 1; R 1 and R 2 are C 1-12 alkyl or aryl groups; R 3 is a C 1-12 alkyl, alkenyl, alkoxy, aminoalkyl or aryl group, or a (meth)acryloxyalkyl group;

(b) an alkylsilyl capped polymer plasticizer within the following formula:

wherein R′ is a hydrocarbon diradical which optionally includes heteroatom and/or silicone-containing groups or linkages; B and B′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, that are optionally interrupted by a linkage selected from the group consisting of carboxy, carbamate, carbonate, ureido, urethane and sulfonate; m 0 or 1; R 4 and R 5 are C 1-12 alkyl or aryl groups; R 6 is a C 1-12 alkyl, alkenyl or aryl group;

(c) an adhesion promoter;

(d) a filler; and

(e) a moisture curing catalyst;

(iii) applying the moisture curable composition to the polyolefin substrate; and

(iv) curing the moisture curable composition.

19. The method of claim 18 , wherein the step of curing includes room temperature curing.

20. The method of claim 18 , wherein the step of curing includes curing at temperatures above room temperature.

21. The method of claim 18 , wherein the step of selecting a polyolefin substrate includes the selecting of a polyethylene or polypropylene substrate.

22. An article of manufacture comprising:

polyolefin substrates having a cured composition therebetween to adhesively join the substrates to one and the other, wherein the cured composition comprises:

(a) alkoxysilyl capped polymer compounds within the following formula:

wherein R is a hydrocarbon diradical which may include heteroatom and/or silicone-containing groups or linkages; A and A′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, with or without interruption by a carboxy, carbamate, carbonate, ureido, urethane or sulfonate linkage; n may be 0 or 1; R 1 and R 2 are C 1-12 alkyl or aryl groups; R 3 is a C 1-2 alkyl, alkenyl, alkoxy, aminoalkyl or aryl group, or a (meth)acryloxyalkyl group;

(b) at least one alkylsilyl capped plasticizer within the following formula:

wherein R′ is a hydrocarbon diradical which optionally includes heteroatom and/or silicone-containing groups or linkages; B and B′ are each C 1-30 linear or branched aliphatic groups or aromatic-containing groups, that are optionally interrupted by a linkage selected from the group consisting of carboxy, carbamate, carbonate, ureido, urethane and sulfonate; m may be 0 or 1; R 4 and R 5 are C 1-12 alkyl or aryl groups; R 6 is a C 1-12 alkyl, alkenyl or aryl group;

(c) an adhesion promoter;

(d) a filler; and

(f) a moisture curing catalyst.

23. The article of claim 22 , wherein the polyolefin substrates include polyethylene or polypropylene substrates.