Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2006-11-21
2006-11-21
Acquah, Samuel A. (Department: 1711)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C528S222000, C528S225000, C528S355000, C528S357000, C528S361000, C528S365000, C525S471000, C524S730000, C524S731000, C524S783000
Reexamination Certificate
active
07138179
ABSTRACT:
Disclosed is a method for preparing a biodegradable polymer in the form of uniform powder or spherical particles by dispersion polymerization without a grinding step. The method for preparing a biodegradable polyester includes dispersing a monomer in the presence of a catalyst in a dispersion solvent to form a solid or liquid phase for dispersion polymerization and thereby to yield a biodegradable aliphatic polyester in the form of spherical particles or powder, the monomer comprising a mixture of a first compound (e.g., lactide or glycolide) and a second compound being selected from the group consisting of polyhydric alcohols (e.g., glycerin, erythritol, penterythritol or dipentaerythritol) and carprolactone. The present invention readily prepares a biodegradable polymer having a high molecular weight in the form of uniform powder or spherical particles.
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patent: 5683723 (1997-11-01), Spenlehauer et al.
patent: 5702717 (1997-12-01), Cha et al.
patent: 6297350 (2001-10-01), Kricheldorf et al.
patent: WO 94/11441 (1994-05-01), None
patent: WO 01/60425 (2001-08-01), None
Jeon Yong Gun
Kim Kyeong Ah
Son Byung Kun
Acquah Samuel A.
Bell Boyd & Lloyd LLC
Chemical & Medical Research Co., Ltd.
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