Patent · US Expired

Thermosensitive polymers and thermoreversible gels obtained from these polymers

US7339013B2 · kind B2 · utility

6Cited by
4References
33Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 13, 2004
Grant dateMar 4, 2008
Priority date—
Expiry dateDec 13, 2024

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08G2650/58
  • WIPO fieldPharmaceuticals
  • WIPO sectorChemistry

Abstract

Polymers which comprise polymer chains of terpolymer type which are constituted by poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) of PEO-PPO-PEO form, which are modified at their termini by groups which can essentially be other chains of PEO-PPO-PEO, acid segments, amine groups or PEOs, these chains being linked to the terpolymer chains via chemical bridges which are constituted by urethane bridges, urea bridges, allophanate bridges and biuret bridges, and which comprise more than 80% by weight of said PEO-PPO-PEO.Thermoreversible physical gels of high viscosification index, which contain these polymers, and their uses.Preparation of these polymers and of these gels.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.