Maro Publications



From 11/28/2014 through 10/18/2011

Maro Encyclopedia



Patent Abstracts

Patent Titles


Biodegradable Polyesters

Polycarbonates (PC)

Polyester Applications

Polyester Coatings

Polyester Nanocomposites

Polyester Film

Polyester Liquid Crystals

Polyester Materials

Polyester Polymerization

Polyethylene Terephthalate (PET)




1. “Polyester is a category of polymers which contain the ester functional group in their main chain. Although there are many polyesters, the term "polyester" as a specific material most commonly refers to polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics through step-growth polymerization such as polycarbonate and polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not.  Depending on the chemical structure, polyester can be a thermoplastic or thermoset; however, the most common polyesters are thermoplastics.” (Wikipedia, Polyesters, 10/18/2011)


2. US Patent 8,889,820 (November 18, 2014). “Amorphous, High Glass Transition Temperature Copolyester Compositions, Methods of Manufacture, and Articles thereof,” Navinchandra S. Asthana, and Ganesh Kannan (Saudi Basic Industries Corporation, Riyadh, Saudi Arabia).

Although polyesters can have a range of desirable performance properties, most of the commercially available amorphous polyesters, such as polyethylene terephthalate (PET), glycol-modified polyethylene terephthalate (PETG), and glycol-modified polycyclo hexylene dimethylene  terephthalate (PCTG), have useful impact properties, but low glass transition temperatures. Thi limits the range of polyester applications.

Asthan and  Kannan of Saudi Basic Industries Corporation, Riyadh, Saudi Arabia, developed an amorphous polyester with a glass transition temperature of 107 to 110 C.  They formed polyesters from 1-phenylindane dicarboxylic acid and a terephthalyl component, together with 1,4-cyclohexanedimethanol.  The the terephthalyl component is derived from recycle polyesters, including post-consumer waste and scrap polyester. In addition, "bio-based terephthalic acid" is derived from a biological (e.g., plant or microbial source) rather than a petroleum source.

8,889,820  (11/18/2014)
Amorphous, high glass transition temperature copolyester compositions, methods of manufacture, and articles thereof 


In this day of overworked technical people, keeping up is nearly impossible.  Maro's mission is to help keep up in as little time as possible.  Bookmark this page and check it often.  You will be surprised what can be picked up in just a few moments spent each day.

These pages list the links as they are found.  Some will abstracted and added to Maro Topics. (RDC 2/7/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

* Date of latest addition; date of first entry is 10/18/2011.

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