Hydrophobic substrate which is able to release a chemical substance
US4283325A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1979 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Aug 15, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/14
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Hydrophobic substrate which can release at least one chemical substance, wherein it comprises a hydrophobic polymer matrix in which are homogeneously distributed inclusions of polymerized compounds of a different type to the said hydrophobic polymer and inclusions of the said substance, the polymerized compound inclusions forming in the said matrix a stable and continuous system in contact with the inclusions of the said substance. Process for the preparation of a hydrophobic substrate able to release a chemical substance, wherein it comprises forming inclusions of polymerized compounds in a hydrophobic polymer powder by grafting onto the latter a monomer of a different type to the said hydrophobic polymer, homogeneously mixing the grafted powder obtained in this way with a powder of the said substance and bringing the mixture into the form of a substrate by hot shaping it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.