Process for preparing copolymers by anionic solvent-free...

Details Process for preparing copolymers by anionic solvent-free... Process for preparing copolymers by anionic solvent-free...

Filed on

2011-02-08

Date issued

2011-02-08

Examiner

Wu, David (Department: 1796)

Patent Class

Synthetic resins or natural rubbers -- part of the class 520 ser

SubClass

Synthetic resins

SubSubClass

Mixing of two or more solid polymers; mixing of solid...

Other Related Categories

C525S056000, C525S061000, C525S415000, C528S354000, C528S357000, C528S358000, C528S413000

Type

Reexamination Certificate

Status

active

Patent number

07884157

Description

ABSTRACT:
The invention concerns a process for preparing a block or comb copolymer comprising at least one hydrophilic portion and at least two hydrophobic portions, by anionic solvent-free polymerization of a prepolymer selected from a polyethylene glycol and a polyvinyl alcohol, and of a lactone or dilactone monomer. The process is carried out in the presence of an alkaline-earth metal hydride, in an inert atmosphere, and the polymerization step is not carried out under vacuum. The invention also concerns copolymers obtained by this process.

REFERENCES:
patent: 6201072 (2001-03-01), Rathi et al.
patent: 6350812 (2002-02-01), Vert et al.
patent: 6590043 (2003-07-01), Nagasaki et al.
patent: 6943211 (2005-09-01), Hubbell et al.
patent: WO 9719973 (1997-06-01), None
patent: WO 2006007402 (2006-01-01), None
Rashkov, I. et al., “Synthesis, characterization, and hydrolytic degradation of PLA/PEO/PLA triblock copolymers with short poly(L-lactic acid) chains”, Macromolecules, 1996, pp. 50-56, XP002390011.
French search report in corresponding FR 0512001.
International search report in corresponding PCT/FR2006/002603.

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