Novel orthoester polymers and orthocarbonate polymers
US4180646A · kind A · utility
140Cited by
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55Claims
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Key dates
| Filing date | Mar 3, 1978 |
| Grant date | Dec 25, 1979 |
| Priority date | — |
| Expiry date | Mar 3, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G67/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention concerns orthoester and orthocarbonate polymers having a repeating mer comprising a hydrocarbon radical and a symmetrical dioxycarbon unit of the general formula: ##STR1## wherein R.sub.1 is a multivalent hydrocarbon radical, R.sub.2 and R.sub.3 are hydrocarbon radicals with at least one of R.sub.2 or R.sub.3 bonded to the dioxycarbon through an oxygen linkage, and which polymers are synthesized by reacting a polyol with an orthoester or orthocarbonate. The polymers are useful for making articles of manufacture, including devices and coatings for delivering beneficial agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.