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US 2008/0174053 A1Published application
Forming a chemically cross-linked particle of a desired shape and diameter
AssigneeSciMed Life Systems, Inc.
InventorsSamuel P. Baldwin, Robert P. Skribiski
Life of this patent
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Abstract
Chemically cross-linked polymeric particles are formed using mechanical rather than chemical processes, facilitating production of small-diameter particles in a manner largely independent of the viscosity or density of the polymer. For example, an uncross-linked resin may be provided in particulate form, agglomerated, and compressed into a mass of a desired shape with a desired diameter, and subsequently cross-linked.
Claims22
A method comprising:
- providing an uncross-linked polyvinyl alcohol resin;
- agglomerating the polyvinyl alcohol resin into a mass;
- and
- cross-linking the mass to thereby form a cross-linked particle.
1 more element
(canceled)
A method comprising:
- providing an uncross-linked polyvinyl alcohol resin;
- adding a binding agent to the polyvinyl alcohol resin, the binding agent having a melting point below a melting point of the polyvinyl alcohol resin;
- agglomerating the polyvinyl alcohol resin into a mass;
- heating the mass to a temperature above the melting point of the binding agent and below the melting point of the polyvinyl alcohol resin;
- cooling the mass to a temperature below the melting point of the binding agent;
- and
- cross-linking the mass to thereby form a cross-linked particle.
4 more elements
Dependencies are inferred from the claim text.