Precision-moldable abrasion-resistant molding composition and moldings (US Patent 3,988,291, 1976)

Maurice G. Knoy, Robert E. Wilkinson and Kenneth W. Johansen received US Patent No. 3,988,291 on October 26, 1976, filed May 27, 1975. It was assigned to Rostone Corp.

The patent's abstract:

Mineral-filled thermosetting molding compositions having both precision-molding or low-shrink characteristics and also high abrasion resistance, plus other desirable properties. "Low profile" molding compositions, known to give smooth surface configurations, have low-shrink properties which also give precision molding characteristics of value in mechanically interfitting molded parts, but have such poor abrasion resistance as to be unusable for desirable applications. Both low-shrink and high abrasion resistance are obtained, with other desired properties, by including a known abrasion-improving polyolefin and by using a long-fiber asbestos as the reinforcing fiber, particularly either chrysotile asbestos or that known as blue asbestos or crocidolite.

Where it was listed

• Asbestos, March 1977, in its patents department (the year's issues)