Embossed oriented polymer films
First Claim
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1. An embossed biaxially oriented thermoplastic film comprising:
- a biaxially oriented thermoplastic film having first and second major surfaces;
a plurality of embossments on at least one of the first and second major surfaces, wherein a plurality of the embossments have a depth of at least 1 micrometer and wherein the tensile strength-at-break and tensile elongation-at-break of the embossed biaxially oriented thermoplastic film have a variance of less than 10 percent from the tensile strength-at-break and tensile elongation-at-break of the biaxially oriented thermoplastic film before embossing.
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Abstract
Embossed oriented thermoplastic films and methods of making them are described. The embossed oriented thermoplastic films have substantially the same mechanical properties as unembossed oriented thermoplastic films. The depth of the embossments ranges from about 1 μm to about 200 μm. The methods include providing an oriented thermoplastic film having first and second major surfaces, softening at least one of the first and second major surfaces to produce a softened surface, embossing the softened surface to produce an embossed oriented thermoplastic film, and cooling the embossed oriented thermoplastic film.
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Citations
22 Claims
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1. An embossed biaxially oriented thermoplastic film comprising:
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a biaxially oriented thermoplastic film having first and second major surfaces;
a plurality of embossments on at least one of the first and second major surfaces, wherein a plurality of the embossments have a depth of at least 1 micrometer and wherein the tensile strength-at-break and tensile elongation-at-break of the embossed biaxially oriented thermoplastic film have a variance of less than 10 percent from the tensile strength-at-break and tensile elongation-at-break of the biaxially oriented thermoplastic film before embossing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An embossed biaxially oriented semi-crystalline thermoplastic film comprising:
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a biaxially oriented semi-crystalline thermoplastic film having first and second major surfaces;
a plurality of embossments on at least one of the first and second major surfaces, wherein a plurality of the embossments have a depth of at least 1 micrometer and wherein the tensile strength-at-break and tensile elongation-at-break of the embossed biaxially oriented semi-crystalline thermoplastic film have a variance of less than 10 percent from the tensile strength-at-break and tensile elongation-at-break of the biaxially oriented semi-crystalline thermoplastic film before embossing. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A layered film construction comprising at least two layers at least one of which is a biaxially oriented thermoplastic film layer having first and second major surfaces having a plurality of embossments on at least one of the first and second major surfaces wherein a plurality of the embossments have a depth of at least 1 micrometer, and another layer selected from the group of thermoplastic polymer films, porous films, metal foils, woven materials, non-woven materials, and combinations thereof;
wherein the tensile strength-at-break and tensile elongation-at-break of the layered film have a variance of less than 10 percent from the tensile strength-at-break and tensile elongation-at-break of the same film without embossing. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
Specification