Method of determining dispersion, particle density or viscosity of resin/solvent mixture containing magnetic particles

US4651092A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Arwed Brunsch · Stuttgart, DE
• Werner Steiner · Schrobenhausen, DE
• Gerhard Trippel · Sindelfingen, DE

Key dates

• Filing date: Sep 21, 1983
• Grant date: Mar 17, 1987
• Expiry date: Sep 21, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/16
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For characterizing coating compositions with magnetic particles the coating composition is subjected to an alternating magnetic field of variable frequency. The field induced by the coating composition after energization is recorded, and thus the susceptibility of the coating composition is measured. Depending on the variable frequency, conclusions can be made regarding the degree of dispersion, particle density, and viscosity of the coating composition. The variable frequency is between 1 and 100 cps, and the field intensity of the energizing field should be lower than 10 Oerstedt. The coating composition is fluid or stagnant in a pipe *1, 11 which is surrounded by field coil and measuring coil.