Thermoplastic elastomer compositions
View Patent ↗Polymer compositions having thermoplastic and elastomeric features are provided. These polymer compositions, which are also characterized by superior compatibility with water-based and solvent-based adhesives, comprise at least one thermoplastic elastomer and at least one maleated ethylene copolymer. The compositions of the invention are useful in articles of manufacture that require flexibility and are fabricated with adhesives, including sporting goods, and particularly athletic shoes.
1. A polymer composition consisting essentially of:
about 60 to about 95 wt % of at least one thermoplastic elastomer that consists essentially of a copolyetheramide of the formula
wherein “PA” represents a linear saturated aliphatic polyamide sequence formed from a lactam or amino acid having a hydrocarbon chain containing 4 to 14 carbon atoms, or from an aliphatic C 6 to C 9 diamine, in the presence of a chain-limiting aliphatic carboxylic diacid having 4 to 20 carbon atoms; wherein the polyamide has an average molecular weight between 300 and 15,000 Daltons;
wherein “PE” represents a polyoxyalkylene sequence formed from linear or branched aliphatic polyoxyalkylene glycols, mixtures thereof or copolyethers derived therefrom, said polyoxyalkylene glycols having a molecular weight of less than or equal to 6000 Daltons; and wherein the number of repeat units, “n”, is sufficient so that the polyetheramide copolymer has an intrinsic viscosity measured in metacresol at 25° C. of from about 0.8 to about 2.05; and
about 5 to about 40 wt % of at least one maleated ethylene copolymer, based on the total weight of the polymer composition;
wherein said at least one maleated ethylene copolymer comprises a grafted copolymer that is the reaction product of a monomer and an ethylene copolymer, wherein said monomer is selected from the group consisting of maleic anhydride, maleic acid, esters of maleic anhydride and half-esters of maleic anhydride and wherein said ethylene copolymer is selected from the group consisting of a copolymer of ethylene, alkyl acrylate, and carbon monoxide; and a copolymer of ethylene, vinyl acetate, and carbon monoxide.
2. The polymer composition of claim 1 , wherein the at least one thermoplastic elastomer is present in an amount of from about 70 to about 90 wt %; and further wherein the at least one maleated ethylene copolymer is present in an amount of from about 10 to about 30 wt %, based on the total weight of the polymer composition.
3. The polymer composition of claim 1 , wherein the at least one thermoplastic elastomer is present in an amount of from about 75 to about 85 wt %; and further wherein the at least one maleated ethylene copolymer is present in an amount of from about 15 to about 25 wt %, based on the total weight of the polymer composition.
4. The polymer composition of claim 1 , wherein the monomer in the grafted copolymer is selected from the group consisting of maleic anhydride and half-esters of maleic anhydride.
5. The polymer composition of claim 1 , wherein the amount of monomer in the grafted copolymer is in the range of 0.3 to 3.0 wt %, based on the total weight of the grafted copolymer.
6. The polymer composition of claim 5 , wherein the amount of monomer in the grafted copolymer is in the range of 0.5 to 1.5 wt %.
7. The polymer composition of claim 1 , wherein the amount of vinyl acetate in the copolymer of ethylene, vinyl acetate, and carbon monoxide is greater than about 15 wt %, based on the total weight of the copolymer.
8. The polymer composition of claim 1 , wherein the amount of alkyl acrylate in the copolymer of ethylene, alkyl acrylate, and carbon monoxide is greater than about 15 wt %, based on the total weight of the copolymer.
9. The polymer composition of claim 1 , wherein the amount of carbon monoxide in the copolymer of ethylene, alkyl acrylate, and carbon monoxide is in the range of about 5 to about 15 wt %, based on the total weight of the copolymer.
10. The polymer composition of claim 1 , further comprising a second maleated ethylene copolymer that is a second grafted copolymer, wherein said second grafted copolymer is the reaction product of a second monomer and a second ethylene copolymer;
wherein said second monomer is selected from the group consisting of maleic anhydride, maleic acid, esters of maleic anhydride and half-esters of maleic anhydride; and
wherein said second ethylene copolymer is selected from the group consisting of a copolymer of ethylene and vinyl acetate and a copolymer of ethylene and an alkyl acrylate.
11. The polymer composition of claim 1 , further comprising a direct copolymer that is the reaction product of ethylene and an alpha, beta unsaturated dicarboxylic acid monomer.
12. The polymer composition of claim 11 , wherein the alpha, beta unsaturated dicarboxylic acid is selected from the group consisting of fumaric acid, maleic acid, maleic anhydride, and the esters and half-esters of maleic anhydride.
13. The polymer composition of claim 12 , wherein the alpha, beta unsaturated dicarboxylic acid comprises maleic acid or a maleic acid ester, or a half-ester of maleic acid.
14. The polymer composition of claim 11 , wherein the direct copolymer is a terpolymer of ethylene, vinyl acetate or an acrylic ester and an alpha, beta unsaturated dicarboxylic acid.
15. The polymer composition of claim 14 , wherein the acrylic ester comprises one or more compounds selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate and iso-butyl acrylate.
16. The polymer composition of claim 14 , wherein the terpolymer comprises from about 60 wt % to about 85 wt % of ethylene, from about 15 wt % to about 39 wt % of the acrylic ester, and from about 1 wt % to about 8 wt % of the alpha, beta unsaturated dicarboxylic acid, based on the total weight of the terpolymer.
17. The polymer composition of claim 14 , wherein the terpolymer comprises from about 70 wt % to about 85 wt % of ethylene, from about 15 wt % to about 29 wt % of the acrylic ester, and from about 1 wt % to about 3 wt % of the alpha, beta unsaturated dicarboxylic acid, based on the total weight of the terpolymer.
18. The polymer composition of claim 14 , wherein the terpolymer comprises a copolymer of ethylene, methyl acrylate, and maleic anhydride.
19. An article comprising the polymer composition of claim 1 .
20. The article of claim 19 , being a sole plate or a shank of a shoe.
21. The article of claim 19 , wherein the article is attached to a second article by means of a water-based adhesive, a solvent based adhesive, or a hot-melt adhesive.
22. The article of claim 21 , wherein the adhesive is a water-based adhesive.
23. The article of claim 21 , wherein the adhesive comprises a polyurethane.
24. The article of claim 22 , wherein the adhesive comprises a polyurethane.
25. The article of claim 21 , wherein the second article comprises a rubber.
26. The article of claim 22 , wherein the second article comprises a rubber.
27. The article of claim 21 , being a shoe, an athletic shoe, an in-line skate, a ski boot, or a binding for a ski boot.
28. The article of claim 22 , being a shoe, an athletic shoe, an in-line skate, a ski boot, or a binding for a ski boot.
29. The polymer composition of claim 11 , wherein the direct copolymer is also a grafted copolymer.