A process is provided for producing a vinyl chloride-based polymer by polymerization of vinyl chloride or a monomer mixture containing it in a reaction vessel. Heat generated during polymerization is removed using a reflux condenser. When the polymerization rate is within a range from 30% to 50%, a copolymeric polyether, with a weight average molecular weight of 1,500,000 to 2,000,000, and an ethylene oxide to propylene oxide molar ratio within a range from 78/22 to 82/18, is added to the reaction mass. Foaming of the polymer slurry due to the use of the reflux condenser beyond the point where the polymerization rate reaches 60% is suppressed, and the polymer can be produced with no deleterious effects on the quality of the product polymer.

 
Web www.patentalert.com

< Methods and compositions for treating gastritis

< Organic-inorganic hybrid polymer materials with compositional gradient, and processes for preparing the same

> Process for producing (3R,5S)-(E)-7-[2-cyclopropyl-4-(4-fluorophenyl)-quinolin- 3-yl]-3,5-dihydroxyhept-6-enic acid esters

> Cytolysis of target cells by superantigen conjugates inducing T-cell activation

~ 00221