glycol polypropylene glycol or polytetramethylene glycol also polyamides or copolyamides modified with epdm or abs and polyamides condensed during processing u201c rim polyamide systems u201d examples of polyamides and copolyamides that can be used are derived from inter alia epsilon caprolactam adipic acid sebacic acid dodecanoic acid isophthalic acid terephthalic acid hexamethylenediamine tetramethylenediamine 2 methyl pentamethylenediamine 2 2 4 trimethylhexamethylenediamine 2 4 4 trimethylhexamethylenediamine m xylylenediamine or bis 3 methyl 4 aminocyclohexyl methane and also semi aromatic polyamides such as polyamide 66 61 for example consisting of 70 95 polyamide 6 6 and 5 30 polyamide 6 1 and also tricopolymers in which some of the polyamide 6 6 has been replaced for example consisting of 60 89 polyamide 6 6 5 30 polyamide 6 1 and 1 10 of another aliphatic polyamide the latter may consist of for example polyamide 6 polyamide 11 polyamide 12 or polyamide 6 12 units such tricopolymers may accordingly be designated polyamide 66 61 6 polyamide 66 61 11 polyamide 66 61 12 polyamide 66 61 610 or polyamide 66 61 612 polyureas polyimides polyamide imides polyether imides polyester imides polyhydantoins and polybenzimidazoles polyesters derived from dicarboxylic acids and dialcohols and or from hydroxycarboxylic acids or the corresponding lactones such as polyethylene terephthalate polypropylene terephthalate polybutylene terephthalate poly 1 4 dimethylolcyclohexane terephthalate polyalkylene naphthalate pan and polyhydroxy benzoates and also block polyether esters derived from polyethers with hydroxyl terminal groups and also polyesters modified with polycarbonates or mbs polycarbonates and polyester carbonates mixtures polyblends of the afore mentioned polymers for example pp epdm polyamide epdm or abs pvc eva pvc abs pvc mbs pc abs pbtp abs pc.