Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1986-04-11
1988-06-28
Herbert, Thomas J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
26417719, 26421112, 2642902, 4284744, 428913, B32B 2734, B29D 722
Patent
active
047538422
ABSTRACT:
Disclosed is a heat-shrinkable biaxially drawn polyamide film which is formed from a homopolymer or copolymer of .epsilon.-caprolactam or a polyblend thereof, by a sequential biaxial drawing method and which has a density of 1.129 to 1.136 g/cm.sup.3 and an in-plane orientation index of 0.0535 to 0.0580. This film is prepared by the steps of drawing in the machine direction a substantially amorphous unoriented polyamide film at 45.degree. to 65.degree. C., a deformation rate of at least 10,000%/min and a draw ratio of 2.7 to 3.5 by a roll type longitudinal drawing method, gripping the ends of the film by tenter clips, drawing the film in the transverse direction at a film temperature not higher than 100.degree. C., an average deformation rate of 2,000 to 10,000%/min and a draw ratio of 3 to 5, and heat-treating the film at 125.degree. to 170.degree. C. while gripping the ends of the film by the tenter clips.
REFERENCES:
patent: 4525414 (1985-06-01), Ohya et al.
patent: 4618528 (1986-10-01), Sacks et al.
Abe Kazuharu
Mori Kenji
Okumura Tsuguo
Herbert Thomas J.
Mitsubishi Monsanto Chemical Company
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