Multilayer structure based on polyamides and on a tie layer made of a copolyamide blend
AssigneeAtofina
InventorChristophe Lacroix
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Abstract
A multilayer structure based on polyamides, comprising: a first layer (1) formed from a polyamide P1 or from a blend of a polyamide P1 and a polyolefin PO1 having a P1 polyamide matrix, optionally, a layer (2a) formed from EVOH; a layer (2) formed from a blend of PA-6/12 copolyamides, one comprising by weight more 6 than 12 and the other more 12 than 6; a layer (3) formed from a polyamide P3, it being possible for P1 and P3 to be identical or different, the layers (1), (2), (2a) and (3) being successive and adhering to one another in their respective contact regions.
Claims20
A polyamide-based multilayer structure comprising:
- a first layer (1) comprising a polyamide P1 or a blend of a polyamide P1 and a polyolefin PO1 having a P1 polyamide matrix,
- optionally, a layer (2a) comprising EVOH;
- a layer (2) comprising a blend of a first PA-6/12 copolyamide, containing more PA-6 by weight than PA-12 and a second PA-6/12 copolyamide containing more PA-12 by weight than PA-6;
- a layer (3) comprising from a polyamide P3, P1 and P3 being identical or different, layers (1), (2), (2a) and (3) being successive and adhering to one another in their respective contact regions.
A polyamide blend comprising a compatibilizer which is a blend of a first PA-6/12 copolyamide, having more PA-6 by weight than PA-12 and a second copolyamide having more PA-12 by weight than PA-6.
Dependencies are inferred from the claim text.