Abrasive tool making process – material – or composition – Miscellaneous
Patent
1991-11-01
1993-06-22
Bell, Mark L.
Abrasive tool making process, material, or composition
Miscellaneous
51298, 51308, 51309, B24D 300
Patent
active
052212912
ABSTRACT:
An abrasive sheet having a high flexibility, mechanical strength and heat resistance, comprises (A) a matrix comprising an aromatic polyimide resin and (B) abrasive grains having an average size of 65-150 .mu.m and evenly dispersed in an amount of 2 to 50% by weight in the matrix, and is produced by forming a thin liquid layer from a dispersion comprising an aromatic polyamic acid solution with a rotation viscosity of 3000 to 6000 poises at 30.degree. C. and the above-mentioned abrasion grains dispersed in the solution, and dry-solidifying the liquid layer of the dispersion while imidizing the aromatic polyamic acid to a corresponding aromatic polyimide, the abrasive sheet having a thickness of 1.1 to 3.0 times the average size of the abrasive grains.
REFERENCES:
patent: 3385684 (1968-05-01), Voter
patent: 3650715 (1972-03-01), Brushek et al.
patent: 3651012 (1972-03-01), Holub et al.
patent: 4221572 (1980-09-01), Torimae et al.
patent: 4575384 (1986-03-01), Licht et al.
patent: 4729771 (1988-03-01), Kunimoto et al.
World Patents Index Latest, Sec. Ch. Week 8935, Derwent Publications, Ltd., p. 29, Oct. 11, 1989.
Patent Abstracts of Japan, vol. 13, No. 469, (M-883) (3817).
Imatani Katsuo
Matsui Yuji
Bell Mark L.
Thompson Willie J.
Ube Industries Ltd.
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