Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-05-01
1993-03-30
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C08K 515
Patent
active
051984849
ABSTRACT:
A process for incorporating a clarifying agent into a semi-crystalline resin is provided whereby a clarifying agent selected from compounds having the formula: ##STR1## wherein p is 0 or 1, m and n are independently 0-3, and R is, at each occurrence, independently selected from C.sub.1-8 alkyl, C.sub.1-4 alkoxy, hydroxy, halogen, C.sub.1-6 alkylthio, C.sub.1-6 alkylsulfoxy and a 4 or 5 membered alkyl group forming a carbocyclic ring with adjacent carbon atoms of the unsaturated parent ring, and wherein the clarifying agent is in the form of a powder characterized by a d.sub.97 of 30 microns or less, and a mean particle size of 15 microns or less, is blended with the polyolefin resin, at a temperature above 170.degree. C. until the clarifying agent is dissolved in the molten resin.
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Binsbergen, Polymer 11 (1970) pp. 253-267: Discussion of nucleating agents for polypropylene including effects of the degree and method of dispersion of the nucleating agent.
Plastics Additives Handbook, edited by Gachter/Muller, pp. 671-676 and 679-683: Discussion of nucleating agents for partly crystalline polymers, especially nucleating agents which are insoluble in the polymer.
Milliken Research Corporation
Monahan Timothy J.
Mulcahy Peter D.
Petry H. William
Schofer Joseph L.
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