Opaque film and method for its preparation

Details Opaque film and method for its preparation Opaque film and method for its preparation

1992-07-15

1993-02-23

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264 455, 264 456, 2642902, 2642888, 521 51, 521 81, 521139, B29D 900, C08J 900

Patent

active

051887770

ABSTRACT:
There are disclosed opaque, biaxially oriented polymeric film structures each comprising a thermoplastic polymer matrix material, e.g., polypropylene, within which is located a stratum of voids, and positioned within each of at least a substantial number of the voids is at least one spherical void-initiating solid particle (i.e., a cavitating agent) of cross-linked polystyrene (CLPS) which is phase-distinct and incompatable with the matrix material, the volume of the particle being substantially less than the volume of the void, with one generally cross-sectional dimension of the particle at least approximating a corresponding cross-sectional dimension of the void.
Also disclosed is a method of preparing the foregoing film structure by extruding into a film a combination of the matrix material and CLPS particles dispersed therein, and biaxially orienting the film either simultaneously or sequentially.

REFERENCES:
patent: 5134173 (1992-07-01), Joesten et al.

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