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:
Apr. 18, 2017
Filed:
Sep. 23, 2015
International Business Machines Corporation, Armonk, NY (US);
Agency for Science, Technology and Research, Singapore, SG;
Mareva B. Fevre, San Jose, CA (US);
James L. Hedrick, Pleasanton, CA (US);
Victor W. L. Ng, Singapore, SG;
Robert J. Ono, San Jose, CA (US);
Shrinivas Venkataraman, Singapore, SG;
Zhi Xiang Voo, Singapore, SG;
Yi Yan Yang, Singapore, SG;
International Business Machines Corporation, Armonk, NY (US);
Agency For Science, Technology And Research, Singapore, SG;
Abstract
Eight-membered ring cyclic carbonates having an oxygen or an acylated nitrogen at position 6 were prepared by reaction of precursor diols with ethyl chloroformate. The cyclic carbonates undergo organocatalyzed ring opening polymerization. In one instance, the initial polymer formed comprises a carbonate repeat unit having a Boc-protected nitrogen in the polymer backbone. Deprotecting the nitrogen with acid forms a cationic carbonate repeat unit having a positive charged secondary ammonium nitrogen in the polymer backbone.