Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Patent
1986-05-06
1987-10-06
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
528 86, 528220, 528222, 528226, C08G 7514
Patent
active
046984151
ABSTRACT:
The invention provides a novel efficient method for the preparation of a polyarylene sulfide or, typically, polyphenylene sulfide by the reaction of an alkali metal sulfide, e.g. Na.sub.2 S, and a polyhalogenated aromatic compound, e.g. 1,4-dichlorobenzene. The improvement in the inventive method comprises performing the reaction in a heterogeneous reaction mixture comprising water and a polyethyleneglycol having a relatively high molecular weight, namely an average molecular weight of from 2,000 to 20,000, and not freely miscible with water. The product polymer is outstandingly free from salt impurities, e.g. sodium chloride, as a byproduct of the reaction. When a low molecular polyethyleneglycol is added to the reaction mixture in combination with the above mentioned high molecular polyethyleneglycol, a remarkable catalytic effect is obtained to accelerate the reaction and increase the yield of the desired polymer product.
REFERENCES:
patent: 4490522 (1984-12-01), Kawabata et al.
patent: 4495332 (1985-01-01), Shiiki et al.
Benecke Herman P.
Sinclair Richard G.
Sowell Sylvester
Anderson Harold D.
Idemitsu Petrochemical Co. Ltd.
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