LOW-BRANCHED HIGH-MOLECULAR POLYVINYL ACETATE, METHOD FOR ITS PREPARING AND POLYVINYL ALCOHOL BASED ON THEREOF Russian patent published in 2005 - IPC

FIELD: organic chemistry, polymers.

SUBSTANCE: invention relates to low-branched high-molecular polyvinyl acetate, methods for its preparing and to polyvinyl alcohol prepared on its base. Invention describes low-branched high-molecular polyvinyl acetate prepared by aqueous-emulsion polymerization of vinyl acetate in the presence of emulsifier and initiating agent wherein complexes of alkylcobalt (III) with tridentate ligands of the general formula (I) are used as an initiating agent taken in the amount 0.04-0.2 mas. p., and the polymerization process is carried out at temperature 10-40°C. Polyvinyl acetate prepared by this method has molecular mass 850000 Da, not less, and degree of branching 0.39-0.7. Polyvinyl alcohol with the polymerization degree 6000 Da, not less, and the saponification degree 98-99.9% that is able for making high-module fibers is prepared by saponification of indicated low-branched polyvinyl acetate.

EFFECT: improved preparing method, valuable properties of product.

3 cl, 3 tbl, 10 ex