Method for preparing poly-p-dioxanone polymer
US5652331A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/664
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Poly-p-dioxanone is prepared in a process comprising: PA1 (a) heating a reaction mixture comprising p-dioxanone and an effective amount of a polymerization catalyst under conditions of temperature and pressure effective to produce a reaction product mixture comprising molten poly-p-dioxanone and unreacted p-dioxanone; PA1 (b) adding to said reaction product mixture a cyclic anhydride under conditions effective for reaction of the poly-p-dioxanone with the cyclic anhydride to form an end-capped poly-p-dioxanone; PA1 (c) exposing the reaction product mixture to a temperature within the range of about 50 to about 150.degree. C. under reduced pressure and removing unreacted p-dioxanone from the reaction product mixture; and PA1 (d) recovering the end-capped poly-p-dioxanone. The invention process permits the economical production of high molecular weight poly-p-dioxanone in the melt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.