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High clarity films with improved thermal properties

A film, the highest temperature technology, applied in the field of film, can solve problems such as slow degradation of plasticizers

Active Publication Date: 2007-01-17
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many plasticizers degrade slowly in the environment and thus present environmental concerns beyond the messy issues discussed above

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] Conventional—using a biodegradable aliphatic-aromatic polyester containing a mixture of adipic and terephthalic acids as the diacid component and 100 mole percent 1,4-butanediol as the diol component (AAPE) compositions and their blends with other biodegradable polymers such as PLA and thermoplastic starch to make films. Table 1 shows the polymer film designation, resin material used, mole percent terephthalic acid in the resin, visual film grade, film formation method, film thickness and melting point range. The melting point range is as defined herein and calculated from the DSC curve obtained at a heating rate of 20°C / min.

[0069] polymer thin

Membrane ID number

Resin material

Terephthalic acid

mole percent

Melting point range

(℃)

Crystallize 1 / 2 hour

time (minutes)

Film forming method

membrane thickness

(10 -3 in)

1

AAPE

43.5

70-130

0.6

calendering

17

...

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PUM

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Abstract

Disclosed is a process for a film or sheet by calendering a polyester composition, comprising one or more semicrystalline polyesters and a release additive, at a maximum temperature below the upper temperature of the melting point range of each of the polyesters in the composition. The polyester composition may comprise one or more biodegradable polyesters such as, for example, aliphatic-aromatic polyesters. The calendered polyesters can form tough, flexible films without the addition of a plasticizer. The film and sheet can have optical and physical properties that make them suitable as a replacement for some plasticized PVC films. Also disclosed is a polyester composition for calendering comprising an aliphatic-aromatic polyester.

Description

field of invention [0001] The present invention generally relates to films prepared by calendering semi-crystalline polyesters. The invention also generally relates to films prepared by orientation calendering of semi-crystalline polyester films. These films can exhibit improved strength, transparency, and heat resistance. Background of the invention [0002] Calendering is an economical and highly efficient method of producing films and sheets from plastics. These films and sheets typically have a thickness from 1 mil (0.025 mm) to 80 mils (2 mm). They are easily thermoformed into various shapes for various packaging applications. For example, calendered polyvinyl chloride film or sheet ("PVC") can be used in a wide range of applications including pool liners, graphic arts, detail cards, encrypted memory cards, plywood, wall cladding, greenhouse glazing, book covers , file folders, floor tiles and products printed or embellished or laminated in s...

Claims

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Application Information

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IPC IPC(8): C08G63/00C08L67/00C08K5/00C08J5/18C08K5/09C08K5/098C08K5/20C08L3/02C08L67/02C08L67/04C08L91/06
CPCC08K5/20C08L3/02C08K5/0008C08K5/098C08L67/00C08L67/04C08L67/02C08K5/09C08L91/06C08L2666/26C08L2666/02
Inventor T·C·格姆罗思C·M·坦纳M·A·斯特兰R·L·皮纳
Owner EASTMAN CHEM CO
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