Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1993-04-08
1994-11-08
Schofer, Joseph L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502167, 502172, 526264, B01J 3703, B01J 3100, C08F 2610
Patent
active
053626982
ABSTRACT:
This invention relates to a process for preparing an improved polymerization free radical initiator delivery system for the polymerization of a monomer containing olefinic unsaturation which comprises uniformly dispersing a water insoluble free radical initiator, an excess amount of the polymeric product of the reaction and between about 1.0 and about 100 wt. % of a surfactant based on initiator in water to form an aqueous mixture containing between about 5 and about 40 wt. % solids; subjecting the dispersion to treatment at a temperature of between about -25.degree. C. and about 0.degree. C. under from about 50 to about 400 milli Tort vacuum for a period of from about 5 to about 24 hours to remove water and to form uniform coprecipitated initiator/polymer microparticles having an average particle diameter of between about 0.001 and about 100 microns and then diluting the coprecipitated microparticles with water under vigorous agitation to form a microparticulate dispersion of low viscosity containing from about 5 to about 40 wt. % solids which is suitable as the initiator feed for contacting said monomer in a polymerization reaction.
REFERENCES:
patent: 3862915 (1975-01-01), Fried et al.
De Thomas Waldo
Narayanan Kolazi S.
Cheng Wu C.
ISP Investments Inc.
Maue Marilyn J.
Schofer Joseph L.
Ward Joshua J.
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