High impact polyurethane

A melt processable non-elastomeric polyurethane consisting essentially of the reaction product of 4,4'-dicyclohexylmethane diisocyanate, 1,4-butanediol and N-butyldiethanolamine catalyst, said polyurethane being devoid of leachable heavy metal or leachable tertiary amine materials.

A melt processable, non-elastomeric polyurethane consisting essentially of a product from the reaction of a non-aromatic diisocyanate, a diol chain extender of up to 12 carbon atoms, a bis-hydroxylalkyl tertiary amine catalyst and up to 5 weight percent of a macroglycol having a molecular weight of about 500-8000 selected from the group consisting of a polyether glycol, a polyester glycol and a silicone glycol, said polyurethane being devoid of leachable heavy metal or leachable tertiary amine materials.

A melt processable non-elastomeric polyurethane consisting essentially of the reaction product of 4,4'-dicyclohexylmethane diisocyanate, 1,4-butanediol, N-butyldiethanolamine catalyst and up to 5 percent by weight of a macroglycol selected from the group consisting of polyethylene oxide glycol and polytetramethylene ether glycol, said polyurethane being devoid of leachable heavy metal or leachable tertiary amine materials.

A method to prepare a melt processable, non-elastomeric polyurethane comprising:

• a) preparing a mixture consisting essentially of a non-aromatic diisocyanate, a diol chain extender, a bis-hydroxylalkyl tertiary amine which is both a chain extender and a catalyst and up to 5 weight percent of a macroglycol having a molecular weight of about 500-8000;
• b) stirring said mixture at a temperature sufficient to induce reaction between said isocyanate, chain extenders and macroglycol to give a viscous melt;
• and c) curing said melt, whereby said polyurethane is devoid of leachable heavy metal or leachable tertiary amine materials.