Multi-layer polyester film for magnetic tape

Details Multi-layer polyester film for magnetic tape Multi-layer polyester film for magnetic tape

1987-03-13

1989-01-17

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

2642358, 2642902, 264299, 428323, 428327, 428328, 428331, 428480, 428900, B32B 516, B32B 2736

Patent

active

047987596

ABSTRACT:
A coextruded, biaxially draw-oriented, multi-layer polyester film as a base film for magnetic tape is described, whose characteristics are that the total thickness of the multi-layer film is no more than 10 .mu.m, the surface roughness of the base film on the side intended for the application of an information-carrying coating has an R.sub.a value (DIN 4768) of less than or equal to 0.010 .mu.m and the surface roughness of the opposite side of the base film which is not intended for application of an information-carrying coating, has an R.sub.a value of greater than 0.010 .mu.m and that the film has an E-modulus in the machine direction of greater than or equal to 6500 N/mm.sup.2.

REFERENCES:
patent: 2884663 (1959-05-01), Alles
patent: 2975484 (1961-03-01), Amborski
patent: 3165499 (1965-01-01), Alles
patent: 3256379 (1966-06-01), Heffelfinger
patent: 3397072 (1968-08-01), Alles
patent: 3461199 (1969-08-01), Campbell
patent: 3515626 (1970-06-01), Duffield
patent: 3958064 (1976-05-01), Brekken et al.
patent: 3983235 (1976-09-01), Seng et al.
patent: 3983285 (1976-09-01), Riboulet et al.
patent: 4139518 (1979-02-01), Janocha et al.
patent: 4198458 (1980-04-01), Mitsuishi et al.
patent: 4320207 (1982-03-01), Watanabe et al.
patent: 4550049 (1985-10-01), Ono et al.
patent: 4568599 (1986-02-01), Ono et al.
patent: 4568616 (1986-02-01), Seifried et al.
patent: 4687699 (1987-08-01), Hensel et al.
patent: 4687700 (1987-08-01), Hensel et al.
English translation of Japanese Patent No. 56-139551, 10/1981, Miura et al., 6 pages.

Affiliated with

Also associated with

Rating

Multi-layer polyester film for magnetic tape does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multi-layer polyester film for magnetic tape, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-layer polyester film for magnetic tape will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2413278