Passivated rare earth magnet or magnetic material compositions

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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524434, 524435, 524403, 524431, 428418, 428413, 252 6254, C08K 300

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active

049887556

ABSTRACT:
Oxidation of particles of rare earth magnetic materials is greatly reduced when a passivating agent such as an oxidation resistant composition or corrosion inhibitor or combinations thereof, is coated thereon. The oxidation resistant composition is a binary or a ternary composition made from (a) at least one amino containing silane compound such as an aminosilane or a polyaminosilane, or (b) at least one epoxy resin, or (c) an epoxy silane compound, or all three such compounds. The oxidation resistant composition, the corrosion inhibitor, or combinations thereof, passivate the surface of the magnetic particles and generally form a highly concentrated coating on the surface thereof. Antidegradants are optionally utilized to improve the performance of the rare earth magnet composition with regard to improved oxidation resistant properties and generally include organic phosphorous compounds and/or alcohols. Various binders such as an elastomer, a thermoplastic, a thermoset, or a polymer generally formed by reaction based injection molding (RIM), act to adhere the various particles together and form an oxidation resistant rare earth magnet composition. Products can be made by various polymer processing techniques such as extrusion, calendering, injection molding, compression molding, and the like. The passivated rare earth magnetic materials of the present invention have excellent high temperature (e.g. 150.degree. C.) oxidation resistance, and excellent corrosion resistance.

REFERENCES:
patent: 4241116 (1980-12-01), Taniyama
patent: 4497722 (1985-02-01), Tsuchida
patent: 4558077 (1985-12-01), Gray
patent: 4869964 (1989-09-01), Mazany
patent: 4876305 (1989-10-01), Mazany
"Effects of Surface Treatment for Thermoplastic Magnet" by Satoh, et al., IEEE Translation Journal on Magnetics in Japan, vol. TJMJ-1, No. 3, Jun. 1985, pp. 387-388.
"Thermoplastic Magnet Having Highly Improved Heat-Resistance" by Satoh, et al., IEEE Translation Journal on Magnetics in Japan, vol. TJMJ-1, No. 8, Nov. 1985.
"Treating Plastic Surfaces with Cold Gas Plasmas" by Peter W. Rose & Edw. M. Liston, Plastics Engineering, Oct. 1985, p. 41.
"Fundamentals of Plasma Chemistry and Technology" by Herman V. Boenig, Technomic Publishing; 1988.
"Corrosion Protection of Copper Metal Surfaces by Plasma Polymerization" by Jan A. VanLier and Robert E. Ray Jr., Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials: Science and Engineering, vol. 56, American Chemical Society, p. 603, 1987.

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