Method of blow or extrusion molding polyoxymethylene resin

Details Method of blow or extrusion molding polyoxymethylene resin Method of blow or extrusion molding polyoxymethylene resin

1993-04-27

1995-10-17

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264523, B29C 4700, B29C 4900

Patent

active

054588391

ABSTRACT:
A process for efficiently producing a hollow molding or a sheet- or rod-shaped molding includes subjecting a composition containing a polyoxymethylene copolymer resin having substantially a linear molecular structure and a melt flow index (MI) value (190.degree. C., 2160 g load) of 0.1 to 2.0 g/10 min to blow -molding or extrusion-molding operations. The preferred polyoxymethylene copolymer is prepared by copolymerizing trioxane as the principle monomer with a cyclic ether or cyclic formal comonomer in the presence of 1.times.10.sup.-3 to 1.times.10.sup.-2 molar % of a boron trifluoride catalyst or a coordination compound thereof, while regulating the chain-terminating or chain-transferring impurities in the reaction system to 1.times.10.sup.-2 molar % or less, and then cooling the product obtained to a temperature of 45.degree. or below within 30 seconds so as to deactivate the catalyst.

REFERENCES:
patent: 4046738 (1977-09-01), Sextro et al.
patent: 4814424 (1989-03-01), Suzumori et al.
patent: 5344911 (1994-09-01), Yamamoto et al.
Abstract for Japanese Appln. 58-38713; vol. 7, No. 118 (C-167) (1263) May 21, 1983.
Abstract for Japanese Appln. 58-34819, vol. 7, No. 114 (C-166) (1259) May 18, 1993.

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