3M Innovative Properties Company

Michael L Teetzel

Robert J DeVoe

Gregg D Dahlke

Robert A Follensbee

Craig A Masmar

Jeffrey S Peterson

Ralph E James

Coated abrasive articles comprise a composition comprising binder and at least about 25% by weight graphite particles, based on the total solids content of the composition.

Coated abrasive articles containing graphite

A tearable abrasive article is provided which includes a backing comprising a polymer film having a scrim partially embedded therein and an abrasive coating comprising a plurality of abrasive articles and a binder bonded to at least one side of the backing.

Tearable abrasive article

The present invention provides a composition for use in coated abrasives. The curable composition comprises a mixture of: i) from about 30 to about 60 weight percent of an oligomeric aminoplast resin having on average at least one pendant &agr;,&bgr;-unsaturated carbonyl group per oligomeric unit; ii) from about 70 to about 40 weight percent of a thermoplastic polyamide miscible in said aminoplast resin, the weight percents being based on the total resin content; and iii) a sufficient amount of a catalyst for the curable oligomeric aminoplast resin having on average at least one pendant &agr;,&bgr;-unsaturated carbonyl group per oligomeric unit, said catalyst being stable at a temperature of mixing of the components. The curable composition can either be in the form of a melt-processable solid or a molten mixture. The present invention also provides single and multilayered treated backing substrates used in coated abrasives.

Aminoplast resin/thermoplastic polyamide presize coatings for abrasive article backings

An improved abrasive flap wheel is comprised of a highly compacted annulus of like-oriented, radially disposed, interleaved coated abrasive flaps and resilient, lofty, non-woven flaps adhesively fastened together at adjacent inner ends. The abrasive flap wheel is made by compressing a stack of juxtaposed flaps of a desired distribution to form a block substantially the same length as the inner perimeter of the annulus, fastening together the ends of the flaps on the surface of the block which will become the inner surface of the annulus and forming the block into an annulus with the free ends of the flaps directed radially outward. The inner ends of the flaps are adhesively fastened together in the process. The degree of annulus compaction is reflected by the compressed thickness of the ends of the non-woven flaps at the inner perimeter which is less than approximately 35% as thick as their uncompressed outer ends. The compacted flap wheel of the invention has a much higher abrasive grain efficiency than conventional less compacted flap wheels.

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Hugo, MN, United States of America

Michael L Teetzel