Process for producing impact-resistant polyacetal resin composit

Details Process for producing impact-resistant polyacetal resin composit Process for producing impact-resistant polyacetal resin composit

1994-11-14

1996-06-25

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

26433119, 525399, 525452, 525453, 525456, 528 44, 528 59, 528 60, 528 61, 528 63, 528 64, 528 67, 528 85, C08G 6348, C08G 1800, C08L 6102, C08J 500

Patent

active

055300618

ABSTRACT:
A process for producing an impact-resistant polyacetal resin composition, which comprises a first step of mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B) and a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt; and a second step of mixing with shear the resulting mixture obtained in the first step, in the presence of at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt. The polyacetal resin composition provided by the above process is useful as a material for such parts as clips, springs, gears, bearings, cams, levers and the like in electric and electronic machines, office machines, automobiles, industrial machines, toys and/or sports goods, etc.

REFERENCES:
patent: 4929712 (1990-05-01), Sugiyama et al.
patent: 4946906 (1990-08-01), Yano et al.
patent: 5183860 (1993-02-01), Kashihara
patent: 5292824 (1994-03-01), Nagai et al.
patent: 5326846 (1994-07-01), Nagai et al.

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