Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1990-12-21
1992-09-15
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
526202, C08F 220
Patent
active
051479486
ABSTRACT:
A method for polymerizing vinyl chloride comprises polymerizing vinyl chloride in an aqueous medium or bulk-polymerizing vinyl chloride, wherein the inner wall of a polymerizer and parts of devices which come in contact with the monomer during the polymerization are coated, prior to the polymerization, with a reaction product having a molecular weight ranging from 500 to 100,000, obtained by condensing a polyhydric phenol and sulfur dichloride in the presence of a Lewis acid as a catalyst. The amount of the polymer adhered to the polymerizer during polymerization of vinyl chloride is substantially lowered and the adhered polymer can be easily washed away through simple water washing according to the foregoing method. Moreover, the method does not adversely affect the reaction time and the quality of the resulting product at all.
REFERENCES:
patent: 4080173 (1978-03-01), Cohen
patent: 4297320 (1981-10-01), Cohen
Chemical Abstracts, vol. 106, No. 14, Abstract No. 102706j, pp. 1-2, Apr. 6, 1987.
Chemical Abstracts, vol. 106, No. 10, Abstract No. 67761z, pp. 1-6, Mar. 9, 1987.
Fukuda Keiichi
Hatakeyama Yasuyuki
Masuko Seiichi
Nakamura Ichisaburo
Yamaguchi Akihiro
Henderson Christopher
Mitsui Toatsu Chemicals Inc.
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