Polyurethanes for articles for medical usage
US4046725A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1976 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Sep 16, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61J1/1468
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyurethane is disclosed which can be used in particular for the production of articles intended to be in contact with blood, characterized in containing a macromolecular chain comprising nitrogen atoms in the form of quaternary ammonium groups, to which molecules of heparin are bonded, these nitrogen atoms originating from polymers consisting of q recurring units of the formula: EQU --A--NH--CO--O--B--O--CO--NH-- (I) and t recurring units of the formula: EQU --A--NH--CO--Z--NH-- (II), these units of the formula (I) and (II) being bonded to one another, and the various symbols of these units having the following meanings: A is a divalent organic radical consisting of a straight-chain or branched-chain alkylene radical containing from 3 to 10 carbon atoms, or a cycloalkylene radical having 5 or 6 carbon atoms in the ring or a phenylene radical which is optionally substituted by 1, 2 or 3 lower alkyl radicals (with at most 4 carbon atoms), or two alkylene or phenylene radicals linked to one another by a divalent hydrocarbon radical containing from 1 to 4 carbon atoms or by a hetero-atom chosen from amongst oxygen, sulphur and nitrogen, B represents a divalent organic radical obtai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.