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:
Nov. 19, 2013
Filed:
Apr. 02, 2008
Doo Sung Lee, Gyeonggi-do, KR;
Kasala Dayananda, Gyeonggi-do, KR;
Bong Sup Kim, Gyeonggi-do, KR;
Sungkyunkwan University Foundation for Corporate Collaboration, Gyeonggi-Do, KR;
Abstract
An amphiphilic pentablock copolymer that is temperature- and pH-sensitive and has superior and sustained gel strength, includes (a) a hydrophilic triblock copolymer that is temperature-sensitive and that is a copolymer of a poly(ethylene glycol)-based compound and a biodegradable polymer that is one or more polymer selected from the group consisting of polylactide, polyglycolide, polycaprolactone, poly(caprolactone-lactide) random copolymer, poly(caprolactone-glycolide) random copolymer, poly(lactide-glycolide) random copolymer, and mixtures thereof; coupled with (b) a polyurethane-based oligomer (PU) that is pH sensitive and that includes a diisocyanate compound represented by a Formula as follows: OCN—(CH)—NCO, where n is an integer of 4 to 10, polymerized with a diol compound having a tertiary amine on a main chain thereof that is one or more of 1,3-bis{1-(2-hydroxyethyl) -4-pyridyl}propane and 1,4-bis(2-hydroxyethyl)piperazine, and is represented by Formulae as follows: where R and R' are alkyl groups of 1 to 8 carbon atoms, respectively.