Microspheric embolic materials having a dual structure of poly(vinyl acetate) core and poly(vinyl alcohol) shell and method for preparing the same
US6191193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2000 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Jul 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/909
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for separating poly(vinyl acetate) particles having various particle sizes, which have been prepared by suspension polymerization of vinyl acetate monomers, into respective microspheric poly(vinyl acetate) particles with uniform particle size distribution by the use of inorganic salt as a dispersing and antistatic agent, a method for preparing the microspheric embolic particles of a dual structure consisting of poly(vinyl acetate) core/poly(vinyl alcohol) shell by suspending the separated poly(vinyl acetate) particles into an aqueous alkali solution and subjecting the suspended particles to a heterogeneous surface saponification and the microspheric embolic particles prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.