Stretched films of polyproplene

Details Stretched films of polyproplene Stretched films of polyproplene

1990-05-21

1992-07-21

Robinson,, Ellis

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428156, 428332, 428339, 428409, 428523, 428910, 264211, 264167, 264284, 264293, 2642884, 2642888, 156196, 156209, B32B 300, B32B 2732, B29C 4900

Patent

active

051321572

ABSTRACT:
A stretched film of polypropylene which is excellent in transparency, substantially free of an antiblocking agent and at least uniaxially stretched and which is characterized in that it has uniformly distributed projections having a height ranging from 0.05 to 0.50 .mu. and a width ranging from 10 to 100 .mu. at least on the surface thereof as well as a method for preparing the foregoing stretched film of polypropylene which comprises the steps of forming, into a sheet, polypropylene which comprises a nucleating agent in an amount selected so that the crystallization temperature of polypropylene is increased by 1.degree.to 10.degree. C. by the addition thereof and then stretching the sheet at a temperature ranging from 140.degree. to 165.degree. C. are herein disclosed.

REFERENCES:
patent: 4478663 (1984-10-01), O'Sullivan
patent: 4775571 (1988-10-01), Mizuno et al.
patent: 4975329 (1990-12-01), Bothe et al.

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