Method of producing a polyether prepolymer
AssigneeSumitomo Chemical Company, Limited
InventorsTakeo Saegusa, Jiro Horikawa, Masahiro Niwano, Takenobu Kanazawa
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Abstract
A method for producing a polyether-polyamide block copolymer is disclosed, comprising copolymerizing, in the presence of an anionic polymerization catalyst, a lactam and a polyether prepolymer presented by the formula: ##STR1## wherein R.sup.1 is an aliphatic hydrocarbon residual group having 2 to 6 carbon atoms, R.sup.2 is an aliphatic hydrocarbon residual group having 3 to 12 carbon atoms, and n is an integer of 4 to 450. The polyester prepolymer is prepared by reacting a polyoxyalkylene having two terminal hydroxy groups with an N-chlorocarbonyl lactam. The polyether-polyamide block according to the invention has high impact strength and is substantially colorless.
Claims3
A method for producing a polyether prepolymer of the formula:
- ##STR15## wherein R.sup.1 is an aliphatic hydrocarbon residual group having 2 to 6 carbon atoms, and R.sup.2 is an aliphatic hydrocarbon residual group having 3 to 12 carbon atoms, comprising reacting a poly(oxyalkylene) having two terminal hydroxy groups and having a number of average molecular weight of 1,000 to 3,000, with an N-chlorocarbonyl lactam in an amount of 0.6 to 1.5 equivalents to the hydroxy group in said poly(oxyalkylene) in the absence of any of a solvent or a dehydrochlorinating agent at a temperature of 10.degree. to 120.degree. C.
Dependencies are inferred from the claim text.