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
2005-08-01
2010-02-02
Zemel, Irina S (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S408000, C514S772700, C424S094100, C424S280100
Reexamination Certificate
active
07655735
ABSTRACT:
The present invention relates to an ionic multi-block copolymer composition comprising tri-block copolymers having a polypropyleneoxide or polybutyleneoxide block positioned between two polyethyleneoxide blocks and the tri-block copolymers are connected through dicarboxylic acid linkages forming a multi-block copolymer having a weight average molecular weight of more than 40,000 Dalton. The higher weight average molecular weight enables the hydrolgel formed from the multi-block copolymer of the present invention to maintain its gel status for more than several days.
REFERENCES:
patent: 5364908 (1994-11-01), Oishi et al.
patent: 6083524 (2000-07-01), Sawhney et al.
patent: 2003/0187148 (2003-10-01), Cohn et al.
patent: 1382628 (2004-01-01), None
patent: WO-2004022121 (2004-03-01), None
Kim Bong-Oh
Lee Sang-Jun
Seo Min-Hyo
Shim Myung-Seob
Fulbright & Jaworski LLP
Lenihan Jeffrey
Samyang Corporation
Zemel Irina S
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