Composite pressure sensitive hydrophilic adhesive and method of preparing the same
US6005039A · kind A · utility
Inventors
Key dates
| Filing date | Jun 30, 1998 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jun 30, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/07
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Composite pressure sensitive hydrophilic adhesive, permeable for water vapor and losing its adhesivness in contact with liquid water, is particularly suitable for temporary glueing to the body surface for medical purposes. The composite is a gelled mixture of: (a) a water swellable, water insoluble polymer, soluble in polar water-miscible solvents boiling at atmospheric pressure at temperatures higher than 100.degree. C. as well as in their mixtures with minor amounts of water, (b) a hydrophilic water swellable polymer, insoluble in water as well as in polar water-miscible solvents boiling at atmospheric pressure at temperatures higher than 100.degree. C., and (c) a polar water-miscible innocuous solvent boiling at atmospheric pressure at temperatures higher than 100.degree. C., if desired mixed with a minor amount of water. A feature of the composite pressure sensitive hydrophilic adhesive of the invention is that the separate polymers (a) and (b) are replaced by a non-crosslinked copolymer of hydrophilic and hydrophobic monomers, only partially soluble in the component (c) but swellable therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.