Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-09-12
2000-01-11
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524492, 524493, 524599, C08K 524
Patent
active
06013710&
ABSTRACT:
Poly-.epsilon.-caprolactones produced by continuous melt polymerization of .epsilon.-caprolactone with the use of aluminium alkoxides are stabilized for storage by incorporation of an effective quantity of silicon derivative such as, for example, a silicon oxide, an inorganic silicate or a silicon alkoxide, preference being given to silicon alkoxides. This process has the effect of greatly limiting the gradual reduction in the inherent viscosity of the poly-.epsilon.-caprolactones in the course of time. In accordance with a preferred embodiment the incorporation of the silicon derivative is preceded by the incorporation of an effective quantity of water, and this further improves the storage stability of the poly-.epsilon.-caprolactones produced with the use of aluminium alkoxides.
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"Poly(lactones), 9, Polymerization mechanism of Metal Alkoxide Initiated Polymerizations of Lactide and Various Lactones"; Hans R. Kricheldorf, et al., Macromolecules 1988, 21, 286-293.
"Mechanism of .epsilon.-Caprolactone Polymerization by Aluminum Alkoxides"; Trazollah Ouhadi, et al., Die Makromolekulare Chemie, Suppl, 1, 191-201 (1975).
Kaszacs Martine
Wautier Henri
Hoke Veronica P.
Solvay ( Societe Anonyme)
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