Process for the preparation of an N-substituted carbamoyl-lactam compound
AssigneeStamicarbon B.V., Licensing Subsidiary of DSM
InventorsAlbert A. van Geenen, Joseph J. M. Bongers, Jozef L. M. van der Loos
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Abstract
The invention concerns a simple, reliable and reproducable process for the preparation of an N-substituted carbamoyl lactam compound, for example of the following formula: ##STR1## where: R is a polyol originating from a polyol having the formula R-(OH).sub.xi, where .sub.xi is an integer.gtoreq.2 R' is an alkyl, aralkyl, alkaryl or aryl group, whether or not cyclic, .sub.yi is an integer.gtoreq.0, (--L) is an unopened lactam ring and (--L--) is an opened lactam block. This process is characterized in that a polyol and a lactam blocked polyisocyanate are reacted in the liquid state in the presence of a metal compound catalyst.
Claims15
A process for preparing a N-substituted carbamoyl-lactam compound by reacting a polyol having an equivalent weight of at least 300 and ranging up to about 2500, with a lactam-blocked polyisocyanate in the liquid state in the presence of a metal compound catalyst.
A process for preparing a N-substituted carbamoyl-lactam compound consisting essentially of reacting a polyfunctional hydroxy compound having a hydroxyl functionality of at least two and an equivalent weight per hydroxyl group between about 1000 and 2500 with a lactam-blocked polyisocyanate in molten lactam in the presence of a metal-lactamate catalayst or a Lewis acid at a temperature ranging between the melting point of said lactam or the lactam polyol mixture and 150.degree. C.
A process for preparing a nylon block copolymer by reacting a lactam in the presence of an activator and a basic lactam catalyst, wherein said activator is an N-substituted carbamoyl-lactam compound having the following formula:
- ##STR8## wherein said formula:
- R is the residue derived from a polyol, said polyol having the formula R--(OH).sub.xi, where
- .sub.xi is an integer .gtoreq.2,
- R' is the residue derived from a diisocyanate,
- .sub.yi is an integer 0,
- (--L) represents a lactam ring having the formula ##STR9## wherein x is the alkylene group of the lactam ring, and (--L--) represents an opened lactam ring having the formula ##STR10## wherein X is the alkylene residue derived from said lactam ring.
Dependencies are inferred from the claim text.