Stock material or miscellaneous articles – Composite – Of polyester
Patent
1994-03-16
1994-11-08
Foelak, Morton
Stock material or miscellaneous articles
Composite
Of polyester
428694ST, 528298, 528308, B32B 2308, B32B 2734, C08G 6302
Patent
active
053625714
ABSTRACT:
There is provided a biaxially oriented polyester base film for a magnetic tape for use in a cassette for a digital audio tape recorder. The film has (a) a stress when the biaxially oriented polyester base film is extended in the longitudinal direction by 5% of at least 12 kg/mm.sup.2, (b) a residual extension in the longitudinal direction of 0.2 % or less and a residual extension in the transverse direction of 0.3% or less, (c) a heat shrinkage in the longitudinal direction of 1.5% or less, (d) at least one surface of which has a surface roughness, Ra, of 25 nm or less, and (e) a film thickness of in the range of from 3 to 12 .mu. m. A magnetic tape for use in a cassette for a digital audio tape recorder is also provided.
REFERENCES:
patent: 5051292 (1991-09-01), Katoh et al.
patent: 5252388 (1993-10-01), Murooka et al.
Chujo Takao
Endou Kouhei
Hamano Hisashi
Nishiyama Masanori
Ogawa Tatsuya
Foelak Morton
Teijin Limited
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