Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1992-02-14
1993-08-24
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528486, 528490, C08F 610
Patent
active
052390535
ABSTRACT:
Vinylpyrrolidone and vinylcaprolactam residual monomers are removed from their respective crosslinked and non-crosslinked, vinyl lactam homopolymers, vinyl lactam copolymers and vinyl lactam terpolymers containing substantially contaminating amounts of residual vinylpyrrolidone or vinylcaprolactam monomer by a process which comprises (1) adjusting the pH of the vinyl lactam polymer slurry containing from about 1 to about 30 wt. % solids or a solution of the vinyl lactam polymer to a pH of less than 5 with an acid selected from the group of sulfuric, phosphoric, carbonic, formic and acetic acids and mixtures thereof; (2) reacting the acid with the residual vinyl lactam monomer at a temperature of from about 50.degree. to about 150.degree. C. for a period of from about 0.5 to about 10 hours until the residual monomer is reduced to less than 5 ppm and (3) drying said solids to a substantially pure vinyl lactam polymeric product in a free-flowing particulate state.
REFERENCES:
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patent: 3072615 (1963-01-01), Riedesel
patent: 3701764 (1972-10-01), Hargitay
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patent: 4795802 (1989-01-01), Nuber et al.
Login Robert B.
Mandella William L.
Smith Terry E.
Taylor Paul D.
Tseng Susan Y.
ISP Investments Inc.
Maue Marilyn J.
Schofer Joseph L.
Ward Joshua J.
Weber Tom
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