Impact-resistant thermoplastic composition

Abstract

The invention relates to a composition comprising: at least one polyamide (A); at least one copolymer (B) comprising polyamide blocks and polyether blocks; a single polyolefin (C), said polyolefin being a polyolefin functionalized by maleic anhydride units or by epoxy units, where the polyamide (A) comprises different units from the polyamide of the polyamide blocks. The invention also relates to objects manufactured from this composition and to the associated manufacturing process.

1 . A composition comprising:
 from 5 to 50 weight percent of at least one polyamide (A);   from 45 to 55 weight percent of at least one copolymer (B) comprising polyamide blocks and polyether blocks;   from 5 to 40 weight percent of a single polyolefin (C), said polyolefin being a polyolefin functionalized by maleic anhydride units or by epoxy units,   
       wherein said polyamide (A) comprises different units from the polyamide of the polyamide blocks. 
     
     
         2 . The composition as claimed in  claim 1 , comprising:
 from 10 to 45 weight percent, of polyamide (A);   from 45 to 55 weight percent, of copolymer (B);   from 10 to 35 weight percent, of polyolefin (C)   from 0 to 35 weight percent of additives.   
     
     
         3 . The composition as claimed in  claim 1 , in which the polyamide (A) is selected from the group consisting of PA 6, PA 11, PA 12, PA 10.10, PA 10.12, PA 6.10, PA 6.12 and the combinations of these. 
     
     
         4 . The composition as claimed in  claim 1 , in which the polyolefin (C) is selected from the group consisting of poly(ethylene/propylene)s grafted with maleic anhydride, poly(styrene/ethylene)s grafted with maleic anhydride and poly(ethylene/acrylate)s grafted with maleic anhydride. 
     
     
         5 . The composition as claimed in  claim 1 , in which the copolymer (B) is chosen from copolymers comprising PA 6 blocks and polytetramethylene glycol blocks, copolymers comprising PA BACM.12 blocks and polytetramethylene glycol blocks and the combinations of these. 
     
     
         6 . The composition as claimed in  claim 1 , wherein the polyamide (A) is a PA 6 and/or in which the copolymer (B) is a copolymer comprising PA 6 and polytetramethylene glycol blocks. 
     
     
         7 . A process for the manufacture of the composition as claimed in  claim 1 , comprising the provision of the polyamide (A), of the copolymer (B) and of the single polyolefin (C), and the blending of these. 
     
     
         8 . An object manufactured from the composition as claimed in  claim 1 . 
     
     
         9 . A process for the manufacture of the object as claimed in  claim 8 , comprising the provision of the composition and the forming of the object. 
     
     
         10 . A composition consisting of:
 from 5 to 50 weight percent of at least one polyamide (A);   from 45 to 55 weight percent of at least one copolymer (B) comprising polyamide blocks and polyether blocks;   from 5 to 40 weight percent of a single polyolefin (C), said polyolefin being a polyolefin functionalized by maleic anhydride units or by epoxy units,   
       wherein said polyamide (A) comprises different units from the polyamide of the polyamide blocks.