Andrejs R Baidins

age ~93

from Wilmington, DE

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Manufacture Of Vesiculated Polymer Granules
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US Patent:

39793427, Sep 7, 1976
Filed:

Sep 19, 1974
Appl. No.:

5/507550
Inventors:

Andrejs Baidins - Wilmington DE
Edward William Gillow - Wilmington DE
Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:

C08J 928
US Classification:

260 25N
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.

High Gloss Durable Tio.sub.2 Pigment
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US Patent:

55542166, Sep 10, 1996
Filed:

Dec 15, 1994
Appl. No.:

8/356760
Inventors:

Andrejs Baidins - Wilmington DE
Michael P. Diebold - Wilmington DE
Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:

C09C 136
US Classification:

106442
Abstract:

A coated TiO. sub. 2 pigment is disclosed with coatings of porous alumina and dense alumina, such dense alumina being formed in the presence of soluble molybdate.

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