Biaxially oriented polypropylene film and method for its product

Details Biaxially oriented polypropylene film and method for its product Biaxially oriented polypropylene film and method for its product

1981-06-11

1983-09-20

Lowe, James B.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

2642907, 2642902, C08L 2312, B29D 724

Patent

active

044057750

ABSTRACT:
This invention relates to biaxially oriented polypropylenefilm and method for its production. The method for its production comprises a step of fusing and extruding polypropylene in a sheet form, a step of cooling and solidifying a formed polypropylene film, a step of preheating it and a step of orienting it in a longitudinal direction and finally in a lateral direction, characterized in that a longitudinal orientation of the polypropylene film is carried out by at least a double-stage process. The polypropylene film thus biaxially oriented has improved rigidity.

REFERENCES:
patent: 3223764 (1965-12-01), Kahn et al.
patent: 3286009 (1966-11-01), Yumoto et al.
patent: 3380868 (1968-04-01), Moser
patent: 3536644 (1970-10-01), Frizelle et al.
patent: 4261944 (1981-04-01), Hufnagal et al.
Translation of Italian Patent 594971, Inventor Fior et al., 6/59 pp. 1-12.

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