Manufacture of polymeric beads
US4656205A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1984 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Nov 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/902
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Beads comprising a polymeric matrix containing a releasable lipophilic compound are made by precipitating the compound from solution within the matrix. Beads may be made by forming a homogeneous blend of the compound in lipophilic polymerizable material and subjecting the blend to bead polymerization while the blend is dispersed as beads in an aqueous medium containing hydrophilic polymerization stabilizer. The lipophilic compound may be a behenyl ester wax inhibitor or other reagent useful downhole or for other purposes and preferably has a relatively high melting point. The polymerizable material preferably dissolves the lipophilic compound and may include acrylic acid, methacrylic acid or other hydrophilic polymerizable material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.