Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1977-06-10
1979-02-20
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
264289, 264290T, 528502, C08G 7316
Patent
active
041406770
ABSTRACT:
A shaped article having a refractive index of not less than 1.625 at least in one direction and possessing excellent physical properties and various uses, which can be prepared by stretching a molded product, which is made of a polymeric material comprising at least 80 mol% of the repeating units of the formula: ##STR1## and having an intrinsic viscosity of not less than 0.25 dl/g when measured in a mixture of phenol and sym.-tetrachloroethane in a weight ratio of 6 : 4 at 30.degree. C. and has a refractive index of not more than 1.610 at least in one direction, at a temperature of 120.degree. to 230.degree. C. with a stretch ratio of 2 to 20 in the same direction as the refractive index is measured, or by melt extruding the polymeric material at a temperature higher than 230.degree. C. and not higher than 360.degree. C. while or immediately followed by stretching with a deformation speed of not less than 20 times the speed of the melt extrusion.
REFERENCES:
patent: 3060191 (1962-10-01), Kolb et al.
patent: 3733302 (1973-05-01), Klebe et al.
patent: 3880812 (1975-04-01), Golinkin et al.
patent: 4070524 (1978-01-01), Keske
Hongo Tsuyoshi
Matsunami Koichi
Miyagawa Takahito
Nagano Hikoichi
Uno Keiichi
Lee Lester L.
Toyo Boseki Kabushiki Kaisha
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