WASH-RESISTANT COPOLYMER

1 . A copolymer having amide structural elements and polyether structural elements and containing at least one structural element A, at least one structural element B and at least one structural element C, wherein:

structural element A is an aliphatic amide repeat unit selected from a structural element obtained from at least one amino acid, a structural element obtained from at least one lactam, and a structural element X1.Y1 obtained from the polycondensation of at least one linear aliphatic diamine designated X1 and at least one linear aliphatic dicarboxylic acid designated Y1,

structural element A containing 10 or more carbon atoms,

structural element B is an aliphatic amide repeat unit selected from a structural element obtained from at least one amino acid, a structural element obtained from at least one lactam, and a structural element X2.Y2 obtained from the polycondensation of:

at least one diamine designated X2, said diamine being selected from a linear or branched aliphatic diamine, a cycloaliphatic diamine, and a mixture thereof, and

at least one dicarboxylic acid designated Y2, said diacid being selected from an aliphatic diacid and a cycloaliphatic diacid,

structural element B containing from 6 to 36 carbon atoms,

structural element A being different from structural element B,

structural element C is a repeat unit of the formula X3.Y3 obtained from the polycondensation of at least one polyethylene glycol diamine and/or at least one polypropylene glycol diamine designated X3 and having a molecular weight of between 200 and 1000 g·mol −1 and a linear aliphatic dicarboxylic acid designated Y3,

structural element A representing at least 30% by weight relative to the total weight of the copolymer,

the melting temperature being between 75 and 130° C., as measured by DSC (differential scanning calorimetry) according to standard ISO 11357-3 (2013),

the melt flow index being between 5 and 200 cm3/10 min, measured at 160° C. under a load of 2.16 kg, determined according to standard ISO 1133-1 (2011), and

the film tensile modulus being less than 200 MPa, as determined according to standard ISO 178 (2010).

2 . The copolymer as claimed in claim 1 , wherein the copolymer comprises at least 30% by weight relative to the total weight of the copolymer of structural elements C.

3 . The copolymer as claimed in claim 1 , wherein the copolymer comprises between 30% and 50% by weight of structural element A, between 10% and 40% by weight of structural element B, and between 30% and 50% by weight of structural element C, relative to the total weight of the copolymer, the sum total of the contents of structural elements A, B, and C being 100%.

4 . The copolymer as claimed in claim 1 , wherein thee structural element A is obtained from a structural element selected from decanolactam, 11-aminoundecanoic acid, lauryllactam, the structural element designated 10.10 obtained from decanediamine and sebacic acid, and the structural element designated 10.12 obtained from decanediamine and dodecanedioic acid.

5 . The copolymer as claimed in claim 1 , wherein the structural element B is obtained from a structural element selected from caprolactam, the structural element designated 6.6 obtained from hexanediamine and adipic acid, and the structural element designated 10.10 obtained from decanediamine and sebacic acid.

6 . The copolymer as claimed in claim 1 , wherein the copolymer is selected from 10.12/6/PPG400.12, 11/6/PPG400.6, 12/6/PPG400.6, 10.10/6/PPG400.10, 11/6/6.6/PPG400.6, 11/12/6/6.6/PPG400.6, and 11/10.10/PPG400.10.

7 . An adhesive composition comprising:

predominantly at least one copolymer as defined in claim 1 and

between 0% and 2% by weight of at least one additive selected from a stabilizer, a dye, and a mixture thereof, relative to the total weight of the composition.

8 . The composition as claimed in claim 7 , wherein the composition comprises between 0.25% and 15% by weight of at least one polymer selected from a polyester, a polyurethane, and a polyamide, relative to the total weight of the composition.

9 . The composition as claimed in claim 7 , wherein the composition comes in the form of a web, a film, granules, a filament, a grid, a powder or a suspension.

10 . A method of using the copolymer as defined in claim 1 , as a heat-sensitive adhesive.

11 . The method as claimed in claim 10 , further comprising joining of flexible materials or joining soles of shoes.