Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2008-03-04
2008-03-04
Richter, Johann R. (Department: 1616)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S09200D, C525S111000, C525S123000, C525S124000
Reexamination Certificate
active
07339013
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.
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Chaffaux Patricia
Dolatkhani Marc
Pagnoux Anne
Alstrum-Acevedo James H
Lucas & Mercanit, LLP
Polymerexpert SA
Richter Johann R.
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