Insoluble vinyl lactam clarifiers

Details Insoluble vinyl lactam clarifiers Insoluble vinyl lactam clarifiers

1987-03-09

1988-08-16

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528499, 528503, 526264, 5253269, 525383, 210735, 210777, 4263303, 4263304, 4263305, 426424, 264345, 264347, C08F 600, C08F 624, C08F 2610, B01D 3702

Patent

active

047645881

ABSTRACT:
The invention relates to highly filterable polyvinyl polypyrrolidone particles and to the process for improving filterability of standard polyvinyl polypyrrolidone granules, wet cakes and slurries which comprises heating granular polyvinyl polypyrrolidone, containing a minor amount of non-crosslinked and/or unsaturated sites while maintaining between 1 wt. % and 20 wt. % moisture at a temperature of between about 50.degree. C. and about 250.degree. C. under a pressure of from about 5 psig. to about 200 psig. and collecting product having an average particle size distribution between about 40 and 400 mesh, a non-volatile water solubles (NVWS) content less than 2% and a filter flow rate greater than 95.

REFERENCES:
patent: 2914516 (1959-11-01), Siggia et al.
patent: 3072615 (1963-01-01), Riedesel
patent: 4051113 (1977-09-01), Kissel et al.
patent: 4180633 (1979-12-01), Dixon
patent: 4433112 (1984-02-01), Straub et al.

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