Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1988-10-05
1989-09-19
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 12, 528 21, 528 33, 528206, 528207, 528271, C08G 6704
Patent
active
048682659
ABSTRACT:
A process is provided for preparing homopolyanhydrides or regularly alternating copolyanhydrides by condensing a bis(trimethylsilyl) ester of a dicarboxylic acid, e.g., an alkylenedicarboxylic acid such as sebacic acid or a bis(p-carboxyphenoxy)alkane such as 1,3-bis(p-carboxyphenoxy)propane, with a dicarboxylic acid chloride, e.g., an alkylenedicarboxylic acid chloride such as sebacoyl chloride or a phenylenedicarboxylic acid chloride such as terephthaloyl chloride or isophthaloyl chloride, to yield the polyanhydride and chlorotrimethylsilane as a by-product. The process may be carried out in the presence of a condensation catalyst, e.g., a highly ionized organic or inorganic fluoride, such as tetrabutylammonium fluoride.
REFERENCES:
K. W. Leong et al., Macromolecules, 20(4), 705-712, 4.87.
K. W. Leong et al., Biomaterials, 1986, vol. 7, Sep., 364-371.
G. A. Olah et al., J. Org. Chem., 44, 4272-4275 (1979).
F. Herrmann et al., Journal of Chromatography, 370 (1986), 49-61.
H. R. Kricheldorf et al., Polymer Bulletin, 1, 383-388 (1979).
Anderson Harold D.
Hoechst Celanese Corp.
Turken Marvin
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