PEBA for direct adhesion to TPE
The invention relates to a copolymer having polyamide PA blocks and polyether PE blocks, in which PA is of diamine.diacid X.Y type; X, the number of carbons of the diamine, is within the range from 6 to 14, and Y, the number of carbons of the diacid, is within the range from 6 to 18. The invention also relates to the use of the said copolymer in a process of direct adhesion between two TPE materials for increasing the peel strength between these materials.
1. A composite article comprising at least two polymer materials which adhere directly to one another, wherein:
a first polymer material is made of a copolymer having polyamide PA blocks and polyether PE blocks (PEBA), in which the number of carbons of the diamine in the PA blocks is within the range from 6 to 14, and the number of carbons of the diacid in the PA blocks is within the range from 6 to 18, and
a second polymer material is made of thermoplastic elastomer (TPE) chosen from identical PEBA with a flexural modulus different from that of the copolymer, PEBA of composition different from that of the said copolymer, copolyether-block-ester (COPE) and/or copolyether-block-urethane (TPU).
2. The composite article according to claim 1 , in which the number of carbons of the diamine in the PA blocks is 6 or 10, and the number of carbons of the diacid in the PA blocks is 10 or 12.
3. The composite article according to claim 1 , in which PE is chosen from polytetramethylene glycol (PTMG), polypropylene glycol (PPG), polytrimethylene glycol (PO3G) and/or polyethylene glycol (PEG).
4. The composite article according to claim 1 , in which the said copolymer comprises from 51 to 90% by weight of polyamide blocks and respectively from 49 to 10% by weight of polyether blocks, with respect to the total weight of copolymer.
5. The composite article according to claim 1 , in which the number-average molecular weight (Mn) of the PA blocks is within the range from 500 to 10,000.
6. The composite article according to claim 1 , in which the number-average molecular weight (Mn) of the PE blocks is within the range from 400 to 1000.
7. The composite article according to claim 1 , wherein the composite article is configured for use in the manufacture of sports equipment, as a component of footwear, as a medical device, as a transmission belt, as an antistatic additive, as waterproof-breathable film, as support for active molecules, as colouring agent, as welding agent, as decorative element and/or as additive for polyamide.