Biaxially drawn polyhexamethylene adipamide film

Details Biaxially drawn polyhexamethylene adipamide film Biaxially drawn polyhexamethylene adipamide film

1980-11-05

1983-01-25

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

2642902, C08G 6946

Patent

active

043704689

ABSTRACT:
Provided is a biaxially drawn film composed substantially of polyhexamethylene adipamide, which has a refractive index of at least 1.560 in both the longitudinal direction and the transverse direction and an ultraviolet absorbance E.sub.268 of not more than 0.4, as measured at a wavelength of 268 m.mu. on a film solution in formic acid. The film preferably exhibits a shrinkage factor of not more than 5% in both the longitudinal direction and the transverse direction, as measured after dipping in hot water at 135.degree. C. for 10 minutes.
The film is prepared by heat-treating a biaxially drawn polyhexamethylene adipamide film in an inert gas atmosphere at a temperature higher than the drawing temperature employed but lower than the melting point of the film.

REFERENCES:
patent: 3502766 (1970-03-01), Tsuruta et al.
patent: 3794547 (1974-02-01), Kuga et al.
patent: 4252966 (1981-02-01), Matsuoka et al.
English Translation of Japanese Patent Publication S44-20874 (1969), col. 9, line 3 to col. 10, line 7.
English Translation of Japanese Patent Publication S37-534 (1962), p. 3, right col.
English Translation of Japanese Patent Publication S46-119/1971, col. 4, Scope of claim.
The Society of Polymer Science, Japan, "Kobunshi/High Polymers, Japan," 1962, 11 (123) p. 433, lines 1-12.

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