Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant
Patent
1993-03-05
1994-09-06
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From aldehyde or derivative thereof as reactant
528416, 528503, C08G 400, C08G 600
Patent
active
053449118
ABSTRACT:
Processes for producing a polyoxymethylene copolymer includes forming a crude polyoxymethylene copolymer by subjecting a reaction system containing trioxane, a cyclic ether or cyclic formal comonomer, and a catalyst (e.g., boron trifluoride or a coordination compound thereof) to copolymerization reaction conditions. During copolymerization, both the total content of impurities and catalyst in the copolymerization reaction system are adjusted. In this regard, the impurities content (i.e., those compounds which form unstable end groups in the polyoxymethylene copolymer and/or those compounds having a chain-terminating or chain-transfer function) in the copolymerization reaction system is adjusted to 1.times.10.sup.-2 mole percent or less based on the total monomer amount, while the the content of the catalyst in the copolymerization reaction system to between 1.times.10.sup.-3 to 1.times.10.sup.-2 mole percent based on the total monomer amount. Immediately after copolymerization has been completed, the crude polyoxymethylene copolymer is quenched to a temperature of 45.degree. C. or less within 30 seconds after completion of copolymerization. Quenching of the crude polyoxymethylene copolymer is preferably simultaneously accompanied by deactivation of the catalyst by bringing the crude polyoxymethylene copolymer immediately following completion of copolymerization into contact with a cold liquid which contains a catalyst deactivator.
REFERENCES:
patent: 4046738 (1977-09-01), Sextro et al.
Patent Abstracts of Japan, vol. 7, No. 114 (C-166) (1259) 18 May 1983 & JP-A-58 034 819 (Asahi Kasei Kogyo KK) 1 Mar. 1983.
Patent Abstracts of Japan, vol. 7, No. 118 (C-167) (1263) 21 May 1983 & JP-A-58 038 713 (Asahi Kasei Kogyo KK) 7 Mar. 1983.
Fleischer Dietrich
Kamiya Makoto
Maeda Nagayoshi
Murao Toshiro
Reuschel Gerhard
Hoechst Aktiengesellschaft
Kight III John
Mosley Terressa M.
Polyplastics Co. Ltd.
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