Laminated polyester film for magnetic recording medium comprisin

Details Laminated polyester film for magnetic recording medium comprisin Laminated polyester film for magnetic recording medium comprisin

1992-09-03

1994-01-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428217, 428323, 428480, 428694ST, 428694SL, 428694SG, 428910, B32B 300

Patent

active

052798810

ABSTRACT:
A laminated polyester film for a magnetic recording medium which has a first polyester layer (A) containing inorganic particles (a) having a Moh's hardness of at least 8 and a specific average particle size and inactive particles (b) having a Moh's hardness of less than 8 and a specific average particle size larger than that of the particle (a) and a second polyester layer (B) containing inactive particles (c) having a Moh's hardness of less than 8 and a specific average particle size, wherein a content of the particles (a) is from 0.25 to 5% by weight based on the weight of the polyester in the layer (A) and less than 0.15% by weight of the whole weight of the polyester in the layers (A) and (B), the contents of the particles (b) and (c) are each 0.05 to 2.0% by weight of the polyester in the layers (A) and (B), respectively, and exposed surfaces of the layers (A) and (B) have coefficients of friction and surface roughness (Ra) which satisfy the specific conditions.

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patent: 5069962 (1991-12-01), Okazaki
patent: 5085915 (1992-02-01), Taga et al.
patent: 5089331 (1992-02-01), Ryoke et al.
patent: 5096773 (1992-05-01), Sakamoto

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