Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1978-05-23
1981-04-28
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428 35, 428480, B32B 2706
Patent
active
042646677
ABSTRACT:
A transparent polyester film having excellent antistatic properties, which are little effected with variation of the humidity, and further having excellent flexing resistance, pinhole resistance and printability, which is made from a mixture comprising (i) a polyester consisting essentially of a residue of dibasic acids wherein at least 80% by mol is terephthalic acid and a residue of at least one glycol and (ii) a block copolyester consisting of a crystalline polyester segment having a high melting point and a soft polymer segment having a low melting point and a number average molecular weight of 400 to 8,000, said soft polymer segment having a low melting point being contained in an amount of 0.5 to 10% by weight on the basis of the whole weight of the components (i) and (ii), and (iii) a sulfonic and/or phosphoric acid metal salt having a good heat resistance, and which is produced by melt-extruding the mixture of the components (i), (ii) and (iii), drawing at least uniaxially and then heat-treating the resultant at a temperature of 170.degree. C. or higher and lower than the melting point of the polyester (i).
REFERENCES:
patent: 2823421 (1958-02-01), Scarlett
patent: 3652713 (1972-03-01), Okazaki et al.
patent: 3702350 (1972-11-01), Kimura et al.
patent: 3970729 (1976-07-01), Walsh et al.
patent: 4061615 (1977-12-01), Couchoud
patent: 4064312 (1977-12-01), Crystal
Isaka Tsutomu
Matsunami Koichi
Miyazaki Yukinobu
Murakami Tetsushi
Yoshino Yasutomi
Buffalow E. Rollins
Lesmes George F.
Toyo Boseki Kabushiki Kaisha
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