Polyether polyoxyalkylene prepolymers and block copolymers made therefrom.

摘要

Polyether prepolymers are made by reacting a polyoxyalkylene having a star-shaped molecule with at least 3 terminal -OH groups and an N-chlorocarbonyl lactam; the prepolymer has the formula:
<CHEM>
wherein R is derived from a polyhydric alcohol or polyvalent amino corripound; R<2> and R<3> are each an aliphatic hydrocarbon residue; n is a number, preferably 7 to 1,000, and p is an integer of 3 or more.
<??>The polymer is reacted in the presence of an anionic catalyst with a lactam; the resultant copolymer is of the formula:
<CHEM>
where R<4> is an aliphatic hydrocarbon residue, k is 0 or 1, and m is a number.
<??>The copolymer can be formed to shape, e.g. a sheet, and has good physical properties including impact strength and freedom from yellowing.