Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-12-07
1995-10-31
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 5283081, C08G 6302
Patent
active
054630150
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 (1993-12-01), Murooka et al.
Chemical Abstracts, vol. 109, No. 10, Sep. 5, 1988, Columbus, Ohio.
Chemical Abstracts, vol. 110, No. 6, 1989 Columbus, Ohio.
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Patent Abstracts of Japan, vol. 14, No. 116, Mar. 5, 1990.
Chujo Takao
Endou Kouhei
Hamano Hisashi
Nishiyama Masanori
Ogawa Tatsuya
Foelak Morton
Teijin Ltd.
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