Polymer films

Details Polymer films Polymer films

B - Operations, Transporting

29

C

18/663

B29C 55/12 (2006.01) B29C 55/06 (2006.01) C08J 9/10 (2006.01)

Patent

CA 1062419

ABSTRACT A stretched polyolefin film having a substantially uniform cellular structure and comprising a crystalline linear polyolefin, which film has the following characteristics:- (1) it comprises no more than 14% by volume of the film of closed cells; (2) it has an apparent density which is 90 to 20% of the density of the starting polyolefin composition; (3) it has a cell factor equal to or less than + 0.65, which factor may be zero or negative, (4) it contains 0 to 25% by weight based on the polyolefin of at least one additive selected from fillers and pigments; (5) it has a thickness up to 11 mils; (6) it comprises cells with dimensions that the average cell colume is not greater than 10-4c.c; and (7) it has been stretched in the plane of the film by an amount corresponding toa stretch ratio of at least 1.1 to 1 in the machine direction or the transverse direction or both.

233497

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