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Agglomerate Size Determination in Magnetic Coatings

IP.com Disclosure Number: IPCOM000075871D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fleck, HR: AUTHOR [+2]

Abstract

The ability to recognize small changes in agglomerate size and distribution is of value in the analysis of magnetic oxide coatings. This knowledge relates to a better understanding of dispersion and milling processes in coating production and offers a useful tool to quality assurance in production monitoring.

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Agglomerate Size Determination in Magnetic Coatings

The ability to recognize small changes in agglomerate size and distribution is of value in the analysis of magnetic oxide coatings. This knowledge relates to a better understanding of dispersion and milling processes in coating production and offers a useful tool to quality assurance in production monitoring.

The principles of the Joyce-Loebl Disc Centrifuge are applied to the examination of resin bonded pigment coatings to determine the degree of dispersion achieved. This is possible based upon the development of specifically controlled spin fluids capable of separating pigment particles from resin binders and grading them into size fractions, which can be analyzed for percentage weight for each fraction. Such spin fluid systems include: 25% EPON* 1004 resin in dimethyl formamide

25% EPON* 1004 resin in dimethyl sulfoxide

25% EPON* 1004 resin in dimethyl sulfoxide/chloroform 3:1

30% Polymethyl methacrylate polymer in dimethyl formamide * Trademark of Shell Oil Company.

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