Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1979-06-01
1981-03-10
Welsh, Maurice J.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
264154, 2642888, 2642893, 264DIG47, B29C 1100, B29C 2710
Patent
active
042553768
ABSTRACT:
Microporous films having improved morphological structure are prepared by the "solvent stretch" method from an olefinic precursor film having a controlled crystalline structure. The crystalline structure of the precursor film is controlled by preparing said film from an olefinic crystalline homopolymer characterized as having a melt index of about 3 to about 20 in the absence of a nucleating agent and a molecular weight distribution ratio of about 3.8 to about 13. In another embodiment the crystalline structure of the precursor film is controlled by incorporating a nucleating agent into the crystalline polymer resin from which the precursor film is prepared which thereby permits a reduction in the melt index of the polymer to about 0.3.
REFERENCES:
patent: 3738904 (1973-06-01), Ikeda et al.
patent: 3839240 (1974-10-01), Zimmerman
patent: 3839516 (1974-10-01), Williams et al.
patent: 3862030 (1975-01-01), Goldberg
patent: 3903324 (1975-09-01), Gukelberger et al.
Celanese Corporation
Genoni Kenneth A.
Welsh Maurice J.
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