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Formable polyester films

a polyester film and film technology, applied in the field of formable biaxial films, can solve the problems of limited commercial acceptance of mylar balloons, inability to be blown into intricate shapes, and limited mylar balloons to simpler shapes, and achieve the effect of increasing the flexibility of the polymeric chain

Inactive Publication Date: 2017-12-28
TORAY PLASTICS AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a type of film that can be easily bent and shaped. The film is made up of a mixture of a type of plastic called crystalline polyester and a substance called a formability enhancer. This enhancer helps to increase the flexibility of the plastic by lowering its melting point. The film has a specific mechanical strength that makes it easier to handle and use. When the film is stretched, it produces a specific texture. This patent is designed to provide a more flexible and easier to work with film for various applications.

Problems solved by technology

However, one drawback that limits commercial acceptance of Mylar balloons is they are not capable of being blown into intricate shapes, such as comic-book characters or famous character silhouettes.
Rather, the Mylar balloons are limited to simpler shapes such as spheres, circles, shapes, hearts, and stars.

Method used

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Examples

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examples

[0099]Examples 1-27 further define various aspects of the present disclosure. These Examples are intended to be illustrative only and are not intended to limit the scope of the present disclosure. Also, parts and percentages are by weight unless otherwise indicated. The inventive formulations of the films are shown in Table 1 below and comprise blends of a polyester (crystalline polyethylene terephthalate (PET)) and a formability enhancer.

[0100]The film preparations of Comparative Examples 1-5 and Examples 1-26 were conducted on a pilot extrusion / biaxial stretching film line utilizing a 20″ wide die and a final line speed of about 100 feet / min. The film preparations described in Comparative Example 6 and Example 27 were conducted on a commercial extrusion / biaxial stretching film line utilizing a 75″ wide die and a final line speed of about 800 and about 500 feet / min., respectively, for Comparative Example 6 and Example 27.

[0101]Resin materials for films used in the examples were as ...

examples 1-2

[0125]Comparative Example 1 was repeated with the exception that Hytrel 7246 resin was added as a blending modifier at 5 and 10 wt. %, respectively, replacing in each case an equal portion of PET-1. The Young's Modulus film properties are shown in Tables 1 and 1A.

examples 3-7

[0127]Comparative Example 1 was repeated with the exception that Hytrel 7246 was added as blending modifier at 15, 25, 30, and 35 wt. %, respectively, replacing in each case an equal portion of PET-1. In some cases, stretching temperatures had to be modified as shown in Table 1 to maintain a stable process. The Young's Modulus film properties are shown in Tables 1 and 1A.

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Abstract

A formable biaxially-oriented film includes a first layer. The first layer includes from about 10 to about 90 wt. % crystalline polyester and from about 10 to about 90 wt. % of a formability enhancer to assist in increasing the polymeric chain flexibility. The formability enhancer has a melting point less than about 230° C. The film has a MD and a TD Young's Modulus of at least 10% lower than a crystalline polyester film in the absence of the formability enhancer. The film may further include a second layer, which includes an amorphous copolyester. The second layer may be adjacent to or attached to the first layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This invention claims priority to U.S. Provisional Patent Application No. 62 / 355,695 filed Jun. 28, 2016, which is hereby incorporated by reference herein in its entirety.FIELD OF INVENTION[0002]The present invention relates generally to formable biaxially-oriented films. More specifically, the present invention is directed to biaxially-oriented films that include crystalline polyester (e.g., crystalline polyethylene terephthalate (PET)) and has a lower resistance to stretching and a softer feel.BACKGROUND OF INVENTION[0003]Films have been used in fresh meat products packaged at the source (i.e., the meat-processing plant instead of the grocery store). These products include, but are not limited to, pork or beef tenderloins, imported racks of lamb, processed meats (e.g., ham, smoked turkey parts, and sliced processed meats (“cold cuts”)), cheese, and sausage products. Many of these products are packaged in thermoformed fill-seal equipme...

Claims

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Application Information

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IPC IPC(8): B32B27/22C08L67/02C08K5/12B32B27/36B32B27/08
CPCB32B27/22C08L2203/16B32B27/36C08K5/12C08L67/02B32B2250/244B32B2307/51B32B2307/702B32B2307/704B32B2307/518B32B2439/70B32B2307/7246C08L2205/025C08L2205/06C08L2207/04B32B27/08A63H27/10B32B2255/10B32B2255/205B32B2270/00B32B2307/54B32B2307/738B32B2439/40B32B2439/46A63H2027/1025
Inventor SAKELLARIDES, STEFANOS L.MANUEL, PAIGEMORITZ, JAN
Owner TORAY PLASTICS AMERICA