Process for stretching incremental portions of an orientable the

Details Process for stretching incremental portions of an orientable the Process for stretching incremental portions of an orientable the

1975-09-17

1978-09-26

Lowe, James B.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 4246, 260873, 260897A, 264 49, 264154, 264288, 264289, 264344, 264DIG47, 428401, 428910, 521 50, 521139, 521 91, 521134, C08L 6706, C08L 2312, B29D 2700, B29C 1702

Patent

active

041168925

ABSTRACT:
There is disclosed a novel process and product produced thereby for the selective stretching of incremental portions of a substrate of a synthetic thermoplastic material selected from the group consisting of a thermoplastic orientable polymer or a blend of a thermoplastic orientable copolymer in which there is admixed an incompatible second phase selected the group consisting of an incompatible polymer or inorganic material. The substrate is stretched in grooved roller pairs by controlling the velocity of introduction of the substrate to maintain the velocity substantially identical to the surface velocity of the roller pair. Stretching of the blends produce an opaque, low density porous sheet.

REFERENCES:
patent: 3257488 (1966-06-01), Rasmussen
patent: 3466358 (1969-09-01), Muller
patent: 3470290 (1969-09-01), Poris et al.
patent: 3517098 (1970-06-01), Rasmussen
patent: 3574809 (1971-04-01), Fairbanks et al.
patent: 3639573 (1972-02-01), Port
patent: 3775521 (1973-11-01), Yamamoto et al.
patent: 3849526 (1974-11-01), Mullen et al.

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