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Testing Particle Size

IP.com Disclosure Number: IPCOM000091696D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Merten, RA: AUTHOR

Abstract

Size of pigment particles in polymeric ink or paint systems is determined by commercially available fineness of grind gages. In high viscosity systems, errors in the results obtained occur as the material does not handle smoothly. Reducing the viscosity of the system with straight solvent results in pigment flocculation or in the formation of lumps in the binder. This results in ambiguous readings. Viscosity of a system is reduced, without adverse effects, by adding incremental amounts of medium viscosity material composed of the same polymers and solvents as the to-be-tested system. Addition of this medium viscosity material is continued until the system becomes less viscous. This mixture is then further reduced to the desired level of viscosity with additions of straight solvent.

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Testing Particle Size

Size of pigment particles in polymeric ink or paint systems is determined by commercially available fineness of grind gages. In high viscosity systems, errors in the results obtained occur as the material does not handle smoothly. Reducing the viscosity of the system with straight solvent results in pigment flocculation or in the formation of lumps in the binder. This results in ambiguous readings. Viscosity of a system is reduced, without adverse effects, by adding incremental amounts of medium viscosity material composed of the same polymers and solvents as the to-be-tested system. Addition of this medium viscosity material is continued until the system becomes less viscous. This mixture is then further reduced to the desired level of viscosity with additions of straight solvent. This procedure does not cause the pigments to flocculate or cause lumping of the binder and it allows for smooth handling of the material during testing.

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