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Process for calendering of polyesters

A technology of polyester calendering, applied in the field of polyester calendering, which can solve the problems of not being durable

Active Publication Date: 2007-01-24
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also desirable that the calendered films and sheets resulting from this process be biodegradable and therefore not durable in the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0094] Examples 1-10. Preparation of several aliphatic compounds using AAPE's containing a mixture of adipic and terephthalic acids as the diacid component and 100 mole percent 1,4-butanediol as the diol component. - Aromatic polyester compositions. The melting point range is as defined above, calculated from the DSC curve obtained at a heating rate of 20°C / min. The AAPEs of Examples 1-4 have a melting point range of 70-130°C and a crystallization half-life of 0.6 minutes. Examples 5 and 7 shown in Table 1 have a melting point range of 70-135°C. Examples 8 and 9 have a melting point range of 60-135°C and a crystallization half-life of 0.7 minutes. The mole percentages and processing conditions of adipic acid and terephthalic acid are given in Table I. Films were prepared on a Dr. Collin equipped with a two-roll mill. AAPE pellets with 0.9% by weight of wax release agent (LICOWAX  S nonacosanoic acid (available from Clariant Corporation) and LICOWAX  OP (butanediol este...

Embodiment 11

[0101] Examples 11-15. A release agent ("RA") containing polylactic acid (melting point range 125-170° C., crystallization half-life 26.3 minutes), AAPE, and Example 1 was prepared according to the method described in Examples 1-10 Several blends of these compounds were calendered to obtain films. The composition (weight percent) and calendering conditions are given in Table IV. The film of Example 11 was clear; Examples 12-18 showed increasing haze and flexibility with increasing % weight of AAPE. The film of Example 14 exhibited some melt fracture due to the lower roll temperature setting. Some adhesion of the film to the calender rolls was observed in Example 17. The film of Example 19 is very flexible and exhibits lower opacity than the film of Example 18.

[0102] Example

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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 relates to a process for preparing a film or sheet by calendering a polyester composition comprising one or more polyesters and a release additive. The polyester composition may comprise one or more biodegradable polyesters. The invention additionally relates to polyester compositions for calendering. Background of the invention [0002] Calendering is an economical and highly efficient method of producing films and sheets from plastics such as plasticized and rigid polyvinyl chloride (abbreviated herein as "PVC") and polypropylene compositions. The films and sheets typically have a thickness from 1 mil (0.025 mm) to 80 mils (2 mm). Calendered PVC film or sheet is easily thermoformed into a variety of shapes that can be used in a variety of applications including packaging materials, pool liners, graphic arts, detail cards, encrypted memory cards, plywood, wall cladding, book covers, Folders, floor til...

Claims

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Application Information

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