Method of making lactone-epoxide copolymer polyols
AssigneeChimiques Ugine Kuhlmann
InventorJacques Brochet
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Abstract
The invention concerns a method for the manufacture of polyols, principally utilizable in the synthesis of polyurethanes, which are ester/ether copolymers with hydroxylated terminal groups obtained by the direct copolymerization of a lactone and a vicinal epoxide in the presence of a chain initiator possessing at least two labile hydrogen atoms per mole and of an alkaline catalyst.
Claims6
A method for the manufacture of a copolymeric polyol comprising forming a reaction mixture of a lactone, an epoxide, a chain initiator having at least two active hydrogen atoms per mole, and an alkaline catalyst and copolymerizing at a temperature and substantially constant corrected pressure during addition of the lactone and epoxide and for a time sufficient to form a copolymeric polyol having the general formula:
- I--PCL--PCL--POA).sub.m OH].sub.n
- wherein I represents the remainder of the initiator, PCL represents a lactonic polyester sequence, POA represents a polyether sequence, m has a mean value less than 2, and n is an integer from 2 to 6, said copolymeric polyol having a central portion predominating in polylactone segments and terminal portions predominating in polyether segments.
Dependencies are inferred from the claim text.