Paper-like thermoplastic film

Details Paper-like thermoplastic film Paper-like thermoplastic film

1977-05-23

1978-04-04

Kendell, Lorraine T.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

264209, 428219, 428323, 428324, 428332, 428338, 428339, B05D 300, B05D 700

Patent

active

040828808

ABSTRACT:
A paper-like thermoplastic film and a process for making it are disclosed. The process involves extruding a mixture of (a) 70-98% by weight of a polyethylene having a maximum melt flow index of 5 decigrams per minute and (b) 2-30% by weight of inorganic lamellar filler particles, e.g., mica, the largest dimension of said particles being less than 150 microns, through a circular die, in the form of seamless tubing, continuously withdrawing the tubing from the point of extrusion, and expanding and simultaneously cooling the tubing while in the plastic formative state at a temperature above the melting temperature to a blow up ratio in the range of from 1.2:1 to 10:1.

REFERENCES:
patent: 3154461 (1964-10-01), Johnson
patent: 3639554 (1972-02-01), Hutt
patent: 3758661 (1973-09-01), Yamamoto et al.
patent: 3845180 (1974-10-01), Pinsky

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