Process for producing oxymethylene copolymer and resinous composition
AssigneeToray Industries, Inc.
InventorsSigeru Okita, Yoshiyuki Yamamoto, Toshihiro Hatsu
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Abstract
A process for producing an oxymethylene copolymer, comprising the steps of polymerizing trioxane and cyclic ether in the presence of a boron trifluoride catalyst, adding a hindered amine compound to the polymer obtained by said polymerization, and stabilizing instable chain ends of the polymer. The oxymethylene copolymer thus obtained provides excellent heat resistance and superior mechanical properties.
Claims22
A process for producing an oxymethylene copolymer, comprising polymerizing trioxane and cyclic ether in the presence of at least one type of polymerization catalyst selected from the group consisting of:
- (a) boron trifluoride, (b) boron trifluoride hydrate, and (c) coordination compounds formed of:
- (c1) boron trifluoride and (c2) organic compounds containing an atom of oxygen or sulphur, adding a hindered amine compound to the polymer obtained by said polymerization;
- and then stabilizing unstable chain ends of the polymer.
A resinous composition produced by adding a hindered amine compound, an antioxidant, and at least one type of degradation accelerator into a copolymer produced from trioxane and cyclic ether.
Dependencies are inferred from the claim text.