Polyoxymethylene multi-copolymer and its resin composition

Details Polyoxymethylene multi-copolymer and its resin composition Polyoxymethylene multi-copolymer and its resin composition

C - Chemistry, Metallurgy

08

G

402/104

C08G 2/22 (2006.01) C08G 2/18 (2006.01)

Patent

CA 2022837

A polyoxymethylene multi-copolymer obtainable by copolymerizing (a) trioxane, (b) at least one cyclic ether or formal compound chosen from the group of ethylene oxide, 1,3-dioxolane, 1,3-dioxepane, 1,3,5-trioxepane and 1,3,6-trioxocane, and (c) at least one compound chosen from the group of glycidyl phenyl ether, styrene oxide and glycidyl naphthyl ether, and characterized in that the number average molecular weight of said polyoxymethylene multi-copolymer is from 10,000 to 100,000, that the melting point (Tm) and crystallization temperature (Tc) there of are in a relationship of Tm - Tc < 15 (°C) and that the size of the spherulites is 10 µm or less, or a resin composition comprised of this polyoxymethylene multi-copolymer and a polyoxymethylene resin, is distinguished in crystallinity, mechanical strength and surface appearance and is particularly suited for faster cycle molding.

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