MULTILAYER STRUCTURE Russian patent published in 2018 - IPC B32B1/08 B32B27/34 C08L77/06 F16L9/12 F16L11/04 

FIELD: chemistry.

SUBSTANCE: invention relates to multilayer structure that can be used for cylindrical structures, such as pipes, hoses, tubes, etc. Multilayer structure comprises layers (A) and (B) of polyamide resin, wherein the layer (A) comprises polyamide resin (A1) which contains at least some constituent of constituent unit derived from lactam which has from 10 to 12 carbon atoms, and constituent derived from aminocarboxylic acid having from 10 to 12 carbon atoms, or composition (a) which contains resin (A1), the layer (B) comprises composition (b), which contains polyamide resin (B1), in which its diamine unit contains a constituent unit derived from methoxylylenediamine in an amount of 70 mol% or more, and its dicarboxylic acid unit contains a constituent unit derived from aliphatic dicarboxylic acid which has from 4 to 8 carbon atoms, in an amount of 70 mol% or more, and a polyamide resin (B2) in which its diamine unit contains a constituent derived from xylylenediamine in an amount of 70 mol % or more, and its dicarboxylic acid unit contains a constituent derived from an aliphatic dicarboxylic acid which has from 9 to 12 carbon atoms, in an amount of 70 mol% or more, and the weight ratio (B1/B2) is 55/45 to 85/15.

EFFECT: multilayer structure of the invention has excellent chemical resistance and barrier properties, and also has improved interlayer adhesion.

7 cl, 1 tbl