Tube connectors based on a polyamide composition

Abstract

A tube connector made from a polyamide composition, the polyamide composition including at least one first polyamide A having an average number of carbon atoms per nitrogen atom C A and at least one second polyamide B having an average number of carbon atoms per nitrogen atom C B , wherein C A ≦8.5 and C B ≧7.5, and wherein C A <C B . The composition may include a third polyamide C having an average number of carbon atoms per nitrogen atom C C , wherein C B ≦C C .

1 . A tube connector part made from a polyamide composition, the polyamide composition comprising at least one first polyamide A having an average number of carbon atoms per nitrogen atom C A  and at least one second polyamide B having an average number of carbon atoms per nitrogen atom C B , wherein C A ≦8.5 and C B ≧7.5, and wherein C A <C B . 
     
     
         2 . The tube connector part of  claim 1 , wherein the difference C B −C A  is from 1 to 6. 
     
     
         3 . The tube connector part of  claim 1 , wherein C A ≦7.5. 
     
     
         4 . The tube connector part of  claim 1 , wherein the at least one first polyamide A is selected from PA 6, PA 4.6, PA 6.6, PA 6/6.6, PA 6/6.T, PA 6.6/6.T, PA 6.6/6.1, PA 6.1/6.T, PA 6.6/6.1/6.T, PA 6.10 and mixtures thereof. 
     
     
         5 . The tube connector part of  claim 1 , wherein the composition comprises from 1 to 70 wt. % of the at least one first polyamide A. 
     
     
         6 . The tube connector part of  claim 1 , wherein the second polyamide B is selected from PA 6.10, PA 6.12, PA 6.14, PA 10.10, PA 11, PA 12, PA 10.12, PA 6.18, PA 12.T, PA 12/10.T, PA 10.10/10.T, PA B.12, PA B.10/10.10, PA IPD.10, PA B.I/12 and mixtures thereof. 
     
     
         7 . The tube connector part of  claim 1 , wherein the composition comprises from 1 to 70 wt. % of the at least second polyamide B. 
     
     
         8 . The tube connector part of  claim 1 , wherein the composition consists of one first polyamide A, one second polyamide B and, optionally, non-polyamide additives. 
     
     
         9 . The tube connector part of  claim 1 , wherein the composition comprises, in addition to the first polyamide A and the second polyamide B, at least one third polyamide C having an average number of carbon atoms per nitrogen atom C C , wherein C C ≧7.5 and C C ≧C B . 
     
     
         10 . The tube connector part of  claim 9 , wherein C C ≧7.5 and C C >C B . 
     
     
         11 . The tube connector part of  claim 9 , wherein the difference C C −C B  is from 1 to 4. 
     
     
         12 . The tube connector part of  claim 9 , wherein the second polyamide B is selected from PA 6.10, PA 6.12 and a mixture thereof; and the third polyamide C is selected from PA 6.14, PA 10.10, PA 11, PA 12, PA 10.12, PA 6.18, PA 12.T, PA 12/10.T, PA 10.10/10.T, PA B.12, PA B.10/10.10, PA IPD.10, PA B.I/12 and mixtures thereof. 
     
     
         13 . The tube connector part of  claim 9 , wherein the composition comprises from 1 to 80 wt. % of the at least one second polyamide B; and the composition comprises from 1 to 70 wt. % of the at least one third polyamide C. 
     
     
         14 . The tube connector part of  claim 9 , wherein the composition consists of one first polyamide A, one second polyamide B, one third polyamide C and, optionally, non-polyamide additives. 
     
     
         15 . The tube connector part of  claim 1 , wherein the amount of polyamides in the composition is from 30 to 100 wt. %. 
     
     
         16 . The tube connector part of  claim 1 , wherein the composition further comprises additives selected from impact modifiers, processing aids, fillers, stabilizers, nucleating agents, dyes, pigments, fireproofing agents and mixtures thereof. 
     
     
         17 . The tube connector part of  claim 1 , which is configured for being welded to one or more tubes. 
     
     
         18 . The tube connector part of  claim 1 , which is part of a circuit for conveying liquids or gases in motor vehicles. 
     
     
         19 . A process of making the tube connector part of  claim 1 , comprising melting and shaping the polyamide composition. 
     
     
         20 . The process of  claim 19 , which is an injection molding process.