Claims
- 1. A polymer film comprising a vinyl aromatic polymer and rubber particles, wherein said rubber particles:
(a) have an aspect ratio greater than five; (b) have an unconstrained particle size of at least 2.5 micrometers; (c) are present at a concentration of less than 2 weight-percent, based on film weight; and wherein said polymer film is biaxially oriented and has a 60-degree gloss of less than 80 in both the machine and transverse direction on both sides of the film, as measured by American Society for Testing and Materials method D-2457.
- 2. The film of claim 1, wherein said film has a surface gloss differential of 25 or less.
- 3. The film of claim 1, wherein said film has a directional gloss differential of 15 or less.
- 4. The film of claim 1, wherein said film has a haze value of 30 or less, when measured on a 1.15 mil (29.2 micrometer) thick film.
- 5. The film of claim 1, wherein said film has:
(d) a surface gloss differential less than 25; (e) a directional gloss differential less than 15; and (f) a haze value of 30 or less, when measured on a 1.15 mil (29.2 micrometer) thick film.
- 6. The film of claim 6, wherein said film has a draw ratio of at least 2 in each of two orthogonal axes in a plane containing a film surface.
- 7. The film of claim 1, wherein said vinyl aromatic polymer is polystyrene.
- 8. The film of claim 1, wherein said rubber particles are selected from the group consisting of polybutadiene, polybutadiene-polystyrene copolymers, and styrene-acrylonitrile-butadiene copolymers.
- 9. A polymer film comprising a blend of general purpose polystyrene and high impact polystyrene, wherein said film contains rubber particles that:
(a) have an aspect ratio greater than five; (b) have an unconstrained particle size of at least 2.5 micrometers; (c) are present at a concentration of less than 2 weight-percent, based on film weight; and wherein said polymer film is biaxially oriented and has a 60-degree gloss of less than 80 in both the machine and transverse direction on both sides of the film, as measured by American Society for Testing and Materials method D-2457.
- 10. An envelope comprising at least two materials, wherein at least one of said materials is the film of claim 1.
- 11. An envelope comprising at least two materials, wherein at least one of said materials is the film of claim 9.
CROSS-REFERENCE STATEMENT
[0001] This application claims the benefit of U.S. Provisional Application No. 60/266,132, filed Feb. 2, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
|
60266132 |
Feb 2001 |
US |