The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2013
Filed:
Mar. 04, 2011
Abdullah M Alabdulrahman, Riyadh, SA;
Hamid a Almegren, Riyadh, SA;
Fares D Alsewailem, Riyadh, SA;
Phillip Joe Brock, Sunnyvale, CA (US);
Daniel Joseph Coady, San Jose, CA (US);
Kazuki Fukushima, San Jose, CA (US);
James Lupton Hedrick, Pleasanton, CA (US);
Hans Werner Horn, San Jose, CA (US);
Julia Elizabeth Rice, Sunnyvale, CA (US);
Abdullah M Alabdulrahman, Riyadh, SA;
Hamid A Almegren, Riyadh, SA;
Fares D Alsewailem, Riyadh, SA;
Phillip Joe Brock, Sunnyvale, CA (US);
Daniel Joseph Coady, San Jose, CA (US);
Kazuki Fukushima, San Jose, CA (US);
James Lupton Hedrick, Pleasanton, CA (US);
Hans Werner Horn, San Jose, CA (US);
Julia Elizabeth Rice, Sunnyvale, CA (US);
International Business Machines Corporation, Armonk, NY (US);
King Abdulaziz City for Science and Technology, Riyadh, SA;
Abstract
A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.