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US 5,290,747 AGranted
Nylon 6 catalyst system
AssigneeIndustrial Technology Research Institute
InventorsWu-Bin Yuo, Jeng-Yue Wu, Mao-Song Lee
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Abstract
A catalyst composition for the polymerization of Nylon 6 from caprolactam comprising a primary catalyst which comprises an alkali metal hypophosphite or an alkaliearth metal hypophosphite, and an organic phosphite cocatalyst. The catalyst composition of this invention is most useful when used in conjunction with the reactive extrusion technology which requires a very fast polymerization rate to take full advantage of this evolving technology.
Claims11
A catalyst composition for the preparation of Nylon 6 from caprolactam, said catalyst composition comprising:
- (a) a primary catalyst selected from the group consisting of alkali metal hypophosphites and alkali earth metal hypophosphites;
- (b) an organic phosphite cocatalyst selected from either compound I or compound II wherein compound I is represented by the following structure:
- ##STR3## wherein R.sub.1, R.sub.2, and R.sub.3 are selected, independently, from the group consisting of aliphatic and aromatic radicals, and compound II is represented by the following structure:
- ##STR4## wherein n is an integer from 1 to 10, and R.sub.4, and R.sub.5 are selected, independently, from the group consisting of aliphatic and aromatic radicals;
- (c) the ratio between said organic phosphite cocatalyst and said primary catalyst is between 0.002 and 500.
2 more elements
Dependencies are inferred from the claim text.