Preparation of a self-bonding thermoplastic elastomer using an in situ adhesion promoter
The invention describes compositions that include amine-containing silsesquioxane or an amine-containing alkyltrialkoxysilane and a thermoplastic elastomer as well as methods of preparation of the compositions that are useful as self-bonding adhesives for various substrates.
1. An article comprising:
a first layer comprising a fluoropolymer or a polymeric material comprising hydroxyl groups; and
a second layer adjacent to the first layer, the second layer comprising a self-bonding composition comprising a mixture of an adhesion promoter comprising the formula:
wherein a is an integer from about 1 to about 3,000;
wherein b is an integer from about 1 to about 3,000;
wherein c is an integer from 1 to about 3,000;
wherein R 1 is a branched or unbranched C1 to C6 hydrocarbon;
wherein R 2 and R 3 are each independently a branched or unbranched C1 to C6 hydrocarbon;
wherein at least one of R 4 and R 5 are each independently a branched or unbranched C1 to C6 hydrocarbon substituted with NH 2 , NHR 6 or NR 6 R 7 or a branched or unbranched C1 to C6 hydrocarbon, provided at least one of R 4 or R 5 is substituted with NH 2 , NHR 6 or NR 6 R 7 ;
wherein R 6 and R 7 are each independently a branched or unbranched C1 to C6 hydrocarbon;
wherein each X and Y, independently, is a covalent bond, a Si atom, R 8 or a hydrogen atom, wherein R 8 is a branched or unbranched C1 to C6 hydrocarbon, wherein the Si atom can be attached to an oxygen atom, R 8 or R 4 ;
and a thermoplastic polyurethane elastomer,
wherein the adhesion promoter is present from about 0.1 weight % to about 5.0 weight % of the total weight of the thermoplastic polyurethane elastomer.
2. The article of claim 1 , wherein R 2 , R 3 , and one or less of R 4 and R 5 are each methyl groups.
3. The article of claim 1 , wherein one of R 4 or R 5 is substituted with NH 2 or NHR 6 .
4. The article of claim 3 , wherein the R 4 and R 5 are each independently an unbranched C1 to C6 hydrocarbon substituted with NH 2 , NHR 6 or NR 6 R 7 , the unbranched C1 to C6 hydrocarbon is an alkyl group, and the amino group is at the terminal end of the alkyl group.
5. The article of claim 1 , wherein the adhesion promoter is present from about 0.5 weight % to about 1.5 weight % of the total weight of the thermoplastic polyurethane elastomer.
6. The article of claim 1 , wherein the first layer comprises a fluoropolymer.
7. The article of claim 1 , wherein the first layer comprises FEP, PFA, MFA, ETFE, ECTFE, PCTFE, PVDF, THV, or a combination thereof.
8. The article of claim 1 , wherein the first layer comprises EVOH.
9. The article of claim 1 , further comprising a third layer adjacent to the second layer, wherein the second layer bonds the first layer to the third layer.
10. The article of claim 1 , wherein the self-bonding composition has been subjected to post-cure treatment, and wherein the peel strength of the self-bonding composition to the first layer is at least about 10 ppi, when tested in a 180°-peel configuration in a peel strength test.