Method for producing vinyl chloride-vinyl acetate copolymers...

Details Method for producing vinyl chloride-vinyl acetate copolymers... Method for producing vinyl chloride-vinyl acetate copolymers...

2011-03-29

2011-03-29

Bernshteyn, Michael M (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S330000, C526S344200, C528S393000

Reexamination Certificate

active

07915364

ABSTRACT:
The invention provides a process for preparing vinyl chloride-vinyl acetate copolymers in the form of their solid resins by means of free-radically initiated suspension polymerization in aqueous medium of 70% to 90% by weight of vinyl chloride, 10% to 30% by weight of vinyl acetate and, if desired, further comonomers copolymerizable therewith, characterized in that 0.1% to 5% by weight of a vinyl acetate-vinyl chloride copolymer soluble in ethyl acetate is introduced as an initial charge, the amounts in % by weight being based in each case on the total weight of the comonomers.

REFERENCES:
patent: 3583959 (1971-06-01), Shen et al.
patent: 4195168 (1980-03-01), Bobbin
patent: 1105177 (1958-09-01), None
patent: 1770901 (1972-02-01), None
patent: 2206593 (1973-08-01), None
patent: 2409800 (1975-09-01), None
patent: 135620 (1979-05-01), None
patent: 899593 (1962-06-01), None
patent: 1113350 (1968-05-01), None
patent: 1592012 (1981-07-01), None
English Patbase Abstract corresponding to DE1105177, Apr. 20, 1961.
English Patbase Abstract corresponding to DE2409800, Mar. 1, 1974.
English Patbase Abstract corresponding to DE1770901, Jul. 17, 1968.
English Patbase Abstract corresponding to DE2206593, Aug. 16, 1973.
English Patbase Abstract corresponding to DD135620, May 16, 1979.

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