The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 1997
Filed:
Mar. 29, 1996
Henri Wautier, Braine-le-Comte, BE;
Lucienne Detournay, Brussels, BE;
Martine Kaszacs, Braine-l'Alleud, BE;
Solvay (Societe Anonyme), Brussels, BE;
Abstract
Poly-.epsilon.-caprolactones are produced by continuous polymerization of .epsilon.-caprolactone as a melt in an extruder (reactive extrusion) with the use, as polymerization initiator, of aluminium trialkoxides in which at least one alkoxy radical includes at least one other oxygen atom besides the oxygen atom constituting the aluminoxane (AI--O) bond. This oxygen atom is advantageously present in the form of an ester or ether functional group. These initiators are generally in the liquid state at ambient temperature and are furthermore miscible with .epsilon.-caprolactone, with the result that they can be used in the absence of solvent. The appropriate adjustment of the feed flow rates of .epsilon.-caprolactone and of initiator to the extruder permits the manufacture of custom-made poly-.epsilon.-caprolactones which have predesigned weight-average molecular masses.