Polymer composition charged with powdered mineral material with a high capacity of water absorption
US4977192A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 28, 1988 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Apr 28, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G24/35
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A granular polymer composition having increased water absorption and desorption capability, resistance to photogradation and increased life span, comprising a water-insoluble but swellable cross-linked polymer material formed of at least one polymer and/or copolymer prepared from at least one unsaturated ethylene monomer having at least one carboxylic, amide, sulfuric, sulfonic, phosphoric, phosphonic, or hydroxyl functional group and at least one powdered mineral charge well dispersed in and intimately bonded to said polymer as a result of its introduction into the mixture of monomers of the same type or of a different type before their polymerization into said polymer or copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.