METHOD OF PRODUCING VINYL CHLORIDE TYPE POLYMER Russian patent published in 2024 - IPC C08F14/06 C08F2/20 

FIELD: manufacturing technology; technological processes.

SUBSTANCE: invention relates to a method of producing a vinyl chloride type polymer, wherein the method involves producing a vinyl chloride type polymer by polymerising a vinyl chloride monomer or a mixture of a vinyl chloride monomer and a monomer, copolymerised with vinyl chloride monomer, in an aqueous medium using a polymerisation reactor. Method involves loading an aqueous solution of copolymerised polyether, characterized by weight-average molecular weight from 1,000 to 3,500, molar ratio between ethylene oxide and propylene oxide in range from 10/90 to 60/40 and the presence of an alkyl group in both its end positions, into the polymerisation reactor in amount of 0.005 to 0.050 wt.pts. in the form of copolymerised polyether with respect to 100 wt.pts. vinyl chloride monomer, during polymerisation, an aqueous solution of copolymerised polyether is added at a polymerisation stage at a degree of polymerisation of 30 to 80%.

EFFECT: suppressing foaming of a polymer suspension formed during polymerisation using a polymerisation reactor, in the absence of any adverse effect on quality, such as bulk density, of the thus obtained vinyl chloride type polymer.

5 cl, 1 tbl, 18 ex