Photocrosslinkable polyphosphazenes and their use as microencapsulation materials
US5464932A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K49/223
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Chalcone and cinnamate bearing polyphosphazenes are disclosed. The polyphusphazenes contain a sufficient number of chalcone or cinnamate groups, or a combination thereof, to achieve a photocrosslinkable material. The phosphazene backbone is transparent from the near and mid-UV to the near infrared region, minimizing degradation of the skeleton both under the high intensity UV irradiation required for the photo-crosslinking reaction and during subsequent exposure to light disclosed. These photosensitive polyphosphazenes are useful for a variety of purposes, including in photolithography, photocurable coatings, for the stabilization of certain non-linear optical properties, and for use in the construction of biocompatible semi-permeable membranes which can be used to encapsulate living cells or other substances of implantation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.