Manufacture of vesiculated polymer granules

Details Manufacture of vesiculated polymer granules Manufacture of vesiculated polymer granules

1974-09-19

1976-09-07

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25L, 260 16, 260 296NR, 260 296WA, 260 297NR, C08J 928

Patent

active

039793427

ABSTRACT:
The invention relates to a process for preparing vesiculated cross-linked polyester resin granules by polymerizing a water-in-oil-in-water emulsion formed from a polymerizable water-immiscible oil phase, composed of an ethylenically unsaturated monomer and a polyester condensation product and an aqueous phase. The polymerization is effected essentially instantaneously and substantially immediately following the formation of the emulsion by contacting the water-immiscible oil phase at a temperature from 10.degree. to 40.degree.C. with an aqueous phase containing a strong base and having a temperature from 65.degree. to 95.degree.C. Polymerization is thereby effected while the size of the oil phase globules of the water-in-oil emulsion is at a minimum and before appreciable agglomeration can take place, resulting in a reduction in particle size and particle size distribution. The product is especially useful as an opacifying pigment for latex paints and the like, wherein it contributes improved hiding power.

REFERENCES:
patent: 3255127 (1966-06-01), Von Bonin
patent: 3740255 (1973-06-01), Fox

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