Blow-moldable polyamide compositions

Abstract

Thermoplastic molding compositions comprising A) from 10 to 99.7% by weight of a polyamide, B) from 1 to 30% by weight of an impact modifier, C) from 0.1 to 10% by weight of a copolymer of C 1 ) from 50 to 95% by weight of styrene or substituted styrenes of the general formula I or a mixture of these in which R is an alkyl radical having from 1 to 8 carbon atoms or a hydrogen atom and R 1 is an alkyl radical having from 1 to 8 carbon atoms and n has the value 0, 1, 2, or 3, and C 2 ) from 5 to 50% by weight of structural units derived from one or more dicarboxylic anhydrides, D) from 0.001 to 20% by weight of iron powder, E) from 0.05 to 3% by weight of a copper-containing stabilizer, F) from 100 ppm to 5% by weight of a phosphorus-containing, inorganic acid or salts thereof or ester derivatives thereof or a mixture thereof, G) from 0 to 2% by weight of a polyethyleneimine homo- or copolymer, H) from 0 to 60% by weight of further additives, where the total of the percentages by weight of A) to H) is 100%.

1 . A thermoplastic molding composition comprising
 A) from 10 to 94% by weight of a polyamide,   B) from 1 to 30% by weight of an impact modifier made of a copolymer I of
 B 1 ) from 35 to 89.9% by weight of ethylene 
 B 2 ) from 10 to 60% by weight of 1-octene or 1-butene or propylene or a mixture of these and 
 B 3 ) from 0.05 to 5% by weight of functional monomers, where the functional monomers have been selected from the group of the carboxylic acid groups, carboxylic anhydride groups, carboxylic ester groups, carboxamide groups, carboximide groups, amino groups, hydroxy groups, epoxy groups, urethane groups and oxazoline groups and mixtures of these, 
 or made of a copolymer II of 
 B 1 ) from 50 to 98% by weight of ethylene 
 B 4 ) from 2 to 50% by weight of acrylic acid or methacrylic acid or (meth)acrylate having from 1 to 18 carbon atoms, or 
 B 5 ) from 0 to 20% by weight of functional monomers selected from the group of the carboxylic anhydride groups and epoxy groups and mixtures of these, 
 or a mixture of these, 
 C) from 0.1 to 10% by weight of a copolymer of
 C 1 ) from 50 to 95% by weight of styrene or substituted styrenes of the general formula I or a mixture of these 
 
   
       
         
           
           
               
               
           
         
         
           
             in which R is an alkyl radical having from 1 to 8 carbon atoms or a hydrogen atom and R 1  is an alkyl radical having from 1 to 8 carbon atoms and n has the value 0, 1, 2, or 3, and 
             C 2 ) from 5 to 50% by weight of structural units derived from one or more dicarboxylic anhydrides, 
           
         
         D) from 0.001 to 20% by weight of iron powder, 
         E) from 0.05 to 3% by weight of a copper-containing stabilizer, 
         F) from 100 ppm to 5% by weight of alkali metal salts or alkaline earth metal salts of oxo acids of phosphorus or a mixture of these, 
         G) from 0 to 2% by weight of a polyethyleneimine homo- or copolymer, 
         H) from 0 to 60% by weight of further additives, 
         where the total of the percentages by weight of A) to H) is 100%. 
       
     
     
         2 . The thermoplastic molding composition according to  claim 1 , comprising
 A) from 20 to 94% by weight   B) from 1 to 30% by weight   C) from 0.1 to 10% by weight   D) from 0.001 to 20% by weight   E) from 0.05 to 3% by weight   F) from 100 ppm to 5% by weight   G) from 0.01 to 2% by weight   H) from 0 to 50% by weight   where the total of the percentages by weight of A) to H) is 100%.   
     
     
         3 . The thermoplastic molding composition according to  claim 1 , comprising, as component C), a copolymer of styrene (C1) and maleic anhydride (C2). 
     
     
         4 . The thermoplastic molding composition according to  claim 1 , comprising, as component C), a copolymer with a ratio of from 1:1 to 8:1 between the units C1:C2. 
     
     
         5 . The thermoplastic molding composition according to  claim 1 , where the molar mass (Mw) of component C) is from 5000 to 25 000 g/mol: Baruah, S. D., Laskar, N. C. Styrene-Maleic Anhydride Copolymers: Synthesis, Characterization and Thermal Properties, J. Appl. Polymer Science 60 (1996), pp. 649-656. 
     
     
         6 . The thermoplastic molding composition according to  claim 1 , in which the C content of component D) is from 0.01 to 1.2 g/100 g when measured by a method based on ASTM E1019. 
     
     
         7 . The thermoplastic molding composition according to  claim 1 , where component F) comprises Na hypophosphite. 
     
     
         8 . The thermoplastic molding composition according to  claim 1 , comprising a copolymer I where B3) is from 0.05 to 5% by weight of an ethylenically unsaturated mono- or dicarboxylic acid or anhydrides thereof. 
     
     
         9 . The thermoplastic molding composition according to  claim 1 , comprising, as copolymer II, an ethylene-(meth)acrylic acid copolymer which has been neutralized to an extent of up to 72% with zinc. 
     
     
         10 . (canceled) 
     
     
         11 . A molding prepared from a thermoplastic molding composition according to  claim 1 . 
     
     
         12 . A molding comprising a thermoplastic molding composition of  claim 1 . 
     
     
         13 . The molding of  claim 12 , wherein the molding is a blow molding. 
     
     
         14 . The thermoplastic molding composition according to  claim 3 , comprising, as component C), a copolymer with a ratio of from 1:1 to 8:1 between the units C1:C2. 
     
     
         15 . The thermoplastic molding composition according to  claim 14 , where the molar mass (Mw) of component C) is from 5000 to 25 000 g/mol: Baruah, S.D., Laskar, N.C. Styrene-Maleic Anhydride Copolymers: Synthesis, Characterization and Thermal Properties, J. Appl. Polymer Science 60 (1996), pp. 649-656. 
     
     
         16 . The thermoplastic molding composition according to  claim 15 , in which the C content of component D) is from 0.01 to 1.2 g/100 g when measured by a method based on ASTM E1019. 
     
     
         17 . The thermoplastic molding composition according to  claim 3 , where component F) comprises Na hypophosphite. 
     
     
         18 . The thermoplastic molding composition according to  claim 3 , comprising a copolymer I where B3) is from 0.05 to 5% by weight of an ethylenically unsaturated mono- or dicarboxylic acid or anhydrides thereof. 
     
     
         19 . The thermoplastic molding composition according to  claim 3 , comprising, as copolymer II, an ethylene-(meth)acrylic acid copolymer which has been neutralized to an extent of up to 72% with zinc.