Process for producing a resin film based on a copolymer of ethyl

Details Process for producing a resin film based on a copolymer of ethyl Process for producing a resin film based on a copolymer of ethyl

1995-06-07

1997-02-11

Watkins, William

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264237, 264327, 2642098, 264564, 2642097, 4253791, 4253781, 425380, 4253824, 4253261, B29C 4786

Patent

active

056017782

ABSTRACT:
The relationship between the average degree of roughness of the faces of rough appearance, expressed in microns, and the percentage by weight of units derived from vinyl acetate in the copolymer of which the film consists is greater than 0.019.
The film is extruded in the form of an extruded sleeve which is cooled in the die by a circulation of a coolant fluid whose temperature T satisfies the relationship: ##EQU1## in which Tc is the temperature at which the Napierian logarithm of the relationship between the length at break and the initial length of a test specimen of the copolymer has a value of 87% of its value at 180.degree.

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patent: 5151234 (1992-09-01), Ishihara et al.
patent: 5248472 (1993-09-01), Yoshikawa et al.

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