The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 1994
Filed:
Apr. 08, 1993
Kolazi S Narayanan, Palisades Park, NJ (US);
Waldo De Thomas, Morristown, NJ (US);
ISP Investments Inc., Wilmington, DE (US);
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.