Process for producing polyoxymethylene copolymer

Details Process for producing polyoxymethylene copolymer Process for producing polyoxymethylene copolymer

2011-03-01

2011-03-01

Truong, Duc (Department: 1765)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C528S243000, C528S265000, C528S422000, C528S425000, C528S480000, C528S501000, C528S50200C, C528S503000, C525S328700, C525S540000

Reexamination Certificate

active

07897672

ABSTRACT:
The problem to be solved is to provide a process for producing a polyoxymethylene copolymer in a molding machine with a reduced generation of formaldehyde gas. In a process for continuously producing a polyoxymethylene copolymer comprising a step of melt-kneading a crude polyoxymethylene copolymer at a temperature not lower than the melting point thereof, devolatilizing under reduced pressure the formaldehyde gas generated as a decomposition product, subsequently mixing a formaldehyde scavenger containing a hydrazide compound (A) while keeping the copolymer in a molten state and immediately pelletizing the mixture, a dispersed solution obtained by slurry-dispersing said (A) in a diluent (B) having a melting point lower than temperature (Ta) which is the lower of the melting point and the decomposition temperature of (A), within a temperature range not lower than the melting point of (B) and lower than (Ta) is used as the formaldehyde scavenger.

REFERENCES:
patent: 2005-272707 (2005-10-01), None
patent: 2006-057047 (2006-02-01), None
patent: 2006-057047 (2006-03-01), None
patent: 96/23825 (1996-08-01), None

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