Method for production of hydrophilic resin
US6388000B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1995 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Apr 24, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L15/60
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a &bgr;-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.