Process for producing vinyl chloride resin of improved dispersibility by dehydration of latex
AssigneeMitsubishi Kasei Vinyl Company
InventorsMasaki Asahi, Yukio Noro
Life of this patent
Estimating the term…
Abstract
A process for producing a granular vinyl chloride resin from a vinyl chloride resin latex prepared by emulsion polymerization or fine suspension polymerization, which comprises: (A) a step of flocculating the vinyl chloride resin latex, (B) a step of dehydrating the flocculated vinyl chloride resin to a water content of at most 50% by weight by means of a filter press dehydrator, a belt press dehydrator or a tube press dehydrator, and (C) a step of drying the dehydrated vinyl chloride resin at a temperature of lower than 80.degree. C.
Claims8
A process for producing a granular vinyl chloride resin of improved dispersibility for a paste resin from a vinyl chloride resin latex prepared by fine suspension polymerization, which comprises:
- (A) flocculating the vinyl chloride resin latex,
- (B) dehydrating the flocculated vinyl chloride resin to a water content of at most 50% by weight by means of a filter press dehydrator, a belt press dehydrator or a tube press dehydrator, and
- (C) drying the dehydrated vinyl chloride resin at a temperature of from 30.degree. to 60.degree. C.
A process for producing a granular vinyl chloride resin of improved dispersibility for paste resin from a vinyl chloride resin latex prepared by emulsion polymerization or fine suspension polymerization, which comprises:
- (A) flocculating the vinyl chloride resin latex,
- (B) dehydrating the flocculated vinyl chloride resin to a water content of at most 50% by weight by means of a filter press dehydrator, a belt press dehydrator or a tube press dehydrator, and
- (C) drying the dehydrated vinyl chloride resin at a temperature of from 30.degree. to 60.degree. C.,
- wherein the dehydration is conducted by the belt press dehydration under a face pressure of at least 1 kg/cm.sup.2 and a linear pressure of at least 1 kg/cm, or by the tube press dehydrator under a face pressure of at least 40 kg/cm.sup.2.
Dependencies are inferred from the claim text.