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
2005-09-20
2009-10-06
Woodward, Ana L (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...
C525S054110, C525S419000, C525S420000, C525S538000
Reexamination Certificate
active
07598318
ABSTRACT:
The present invention relates to a thermosensitive and biocompatible poly(organophosphazenes) represented by Formula 1, and a preparation method thereof:wherein R is a methyl or ethyl group; R′ is selected from the group consisting of COOR, CH2COOR, CH2CH2COOR, CH2CH(CH3)2, CH2C6H5, CH(CH3)CH2CH3and CH3; R″ is selected from the group consisting of CH2COOR, CH2CH2COOR, CH2CH(CH3)2, CH2C6H5, CH(CH3)CH2CH3and CH3; R′″ is a group selected from the group consisting of CH2COOR, CH2CH2COOR and H, wherein R is the same as defined above; n is a number between from 30 to 100; x is a number selected from the integers of 3, 4, 7, 12 and 16; y is a number between from 0.5 to 1.5; a equals to 1; and b and c equal to 0 or 1.
REFERENCES:
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Lee, Bae Hoon et al. (2002). “A Thermosensitive Poly(organophosphazene) Gel,”Macromolecules35(10): 3876-3879.
Lee, Bae Hoon et al. (2002). “Thermosensitive and Hydrolysis-sensitive Poly(organophosphazenes),”Polymer International51: 658-660.
Lee, Bae Hoon et al. (2002). “Synthesis and Characterization of Thermosensitive Poly(organophosphazenes) with Methoxy-Poly(ethylene glycol) and Alkylamines as Side Groups,”Bulletin of the Korean Chemical Society23(4): 549-554.
Kim, Joo Ik et al. (2004). “Synthesis and Characterization of Nanosized Poly(organophosphazenes)with Methoxy-poly(ethylene glycol) and Dipeptide Ethyl Esters As Side Groups,”Polymer45: 7083-7089.
Seong, Ji-Yeon et al. (2005). “New Thermogelling Poly(organophosphazenes)with Methoxypoly(ethylene glycol) and Oligopeptide As Side Groups,”Polymer46: 5075-5081.
Jun Yong Joo
Kim Joo Ik
Seong Ji Yeon
Sohn Youn Soo
EWHA University - Industry Collaboration Foundation
Ludwig S. Peter
Woodward Ana L
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