Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1992-11-04
1994-11-15
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428328, 428329, 428480, 428694ST, 428694SG, 428900, B32B 516
Patent
active
053646983
ABSTRACT:
A laminated polyester film for a magnetic recording medium having at least three layers, in which each of a top layer and a bottom layer of the at least three layers contains inorganic particles having a Moh's hardness of at least 8 and an average particle size of 0.005 to 0.5 .mu.m in an amount of 0.25 to 5% by weight based on the weight of the polyester of the respective layer and, in total, not larger than 0.20% by weight based on the whole weight of the polyesters of all the layers including an intermediate layer, and exposed surfaces of the top and bottom layers have coefficients of friction and surface roughness which satisfy the specific conditions.
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patent: 4697700 (1987-08-01), Hensel et al.
patent: 4798759 (1989-01-01), Dallman et al.
patent: 5006589 (1991-04-01), Sakamoto et al.
patent: 5069962 (1991-12-01), Okazaki et al.
patent: 5096773 (1992-03-01), Sakamoto
Abstract of Japanese Publication, Sakamoto Seiji, Diafoil Co., Ltd.
Diafoil Hoechst Company Limited
Le H. Thi
Thibodeau Paul J.
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