Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-02-05
1990-12-11
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528126, 528128, 528219, C08G 802, C08G 6538
Patent
active
049772309
ABSTRACT:
A heat-resistant film or sheet produced by melt extruding polyether ketone having an intrinsic viscosity of at least 0.4 dl/g, which is obtained by heat treating an unstretched film or sheet which comprises (i) heat-treating to crystallization being not more than 60%, or (ii) uni- or biaxially stretching under specific conditions to an extent in which a stress at 5% elongation in the stretched direction is at least 13 kg/mm.sup.2 ; an initial elastic modulus in the stretched direction is at least 600 kg/mm.sup.2 ; and thermal shrinkages in a lengthwise direction and its vertical direction are not more than 4%.
The film or sheet of the present invention is excellent in such properties as heat resistance, mechanical strength and the like, and is suitable for use as a substrate for magnetic recording or electric insulation.
REFERENCES:
patent: 3928295 (1975-12-01), Rose
patent: 4320224 (1982-03-01), Rose et al.
Nakata Michio
Nozawa Seiichi
Utsumi Shigeo
Diafoil Company Limited
Hampton-Hightower P.
Kight III John
Mitsubishi Chemical Industries Limited
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