Recording material containing asbestos

Details Recording material containing asbestos Recording material containing asbestos

B - Operations, Transporting

32

B

42/16

B32B 5/16 (2006.01) B41M 5/155 (2006.01)

Patent

CA 1082459

ABSTRACT OF THE DISCLOSURE A recording sheet consisting mainly of fibrous material is capable of displaying a colored image when contacted under pressure with substantially colorless crystal violet lactone and similar dye precursors if at least 3% of the fibrous mate- rial is constituted by uniformly distributed asbestos fibers. Sheets having adequate strength for carbonless copying should not contain more than 30% asbestos fibers. Stronger colors are obtained if the sheet further contains a mixture of ?-alumina and ?-alumina precursors in an amount of 2% to 20% of the weight of the fibrous material, the mixture containing 1% to 30% water volatile at 1000°C, and being converted substantial- ly entirely to ?-alumina when heated from 300° to 1000°C.

270013

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