Polycarbonates and the use thereof for the preparation of bioerosible matrices
US5463012A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1993 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Dec 13, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/38
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Polycarbonates of formula (I) wherein a is an integer from 2 to 300; R.sup.1 and R.sup.2 are the same or different and are independently a polyester residue of formula (III) wherein x and y are integers from 1 to 50, R.sup.4 and R.sup.5, which are the same or different, are aliphatic straight or branched hydrocarbon chains having from 1 to 4 carbon atoms, R.sup.6 is an aliphatic or alicyclic straight or branched chain having from 2 to 18 carbon atoms, or a polyoxyalkylene residue of formula (II), the two groups --R.sup.4 --COO and --R.sup.5 --COO being randomly distributed in the polyester residue, x and y being in any possible ratio from 0 to 100, are synthesized by reacting dihydroxy compounds with 1,1'-carbonyldiimidazole. They are useful for the preparation of bioerosible matrices for biologically active compounds. ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.