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US 2014/0228559 A1Published application
Dissolution of oxidized cellulose
AssigneeCovidien LP
InventorsValentino J. Tramontano, Joshua Kennedy, Sajida Farooqi, Phillip D. Blaskovich, Rachit Ohri, Daniel S. Costa
Life of this patent
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Abstract
A process for dissolving modified cellulose is disclosed. The process includes contacting modified cellulose with a solvent in a mixture to form swelled modified cellulose and then contacting the mixture with a salt to dissolve the swelled modified cellulose.
Claims22
A process comprising:
- forming a mixture by contacting a modified cellulose with a solvent under an inert atmosphere to form a swelled modified cellulose;
- adjusting the mixture to a first temperature from about 115° C. to about 145° C.;
- contacting the swelled modified cellulose with a salt under the inert atmosphere to form a modified cellulose solution;
- and
- adjusting the modified cellulose solution to a second temperature from about 90° C. to about 120° C.
2 more elements
A process comprising:
- forming a mixture by contacting an oxidized cellulose with a solvent under an inert atmosphere to form a swelled oxidized cellulose, the oxidized cellulose having a degree of oxidation of from about 0.2 to about 1.0;
- adjusting the mixture to a first temperature from about 115° C. to about 145° C.;
- contacting the swelled oxidized cellulose with a salt under the inert atmosphere to form an oxidized cellulose solution;
- and
- adjusting the oxidized cellulose solution to a second temperature from about 90° C. to about 120° C., wherein the dissolved oxidized cellulose has a degree of oxidation from about 80% to about 120% of the degree of oxidation of the predissolved oxidized cellulose.
2 more elements
A process comprising:
- forming a mixture by contacting a modified cellulose with a solvent under an inert atmosphere to form a swelled modified cellulose;
- adjusting the mixture to a first temperature from about 115° C. to about 145° C.;
- contacting the swelled modified cellulose with a salt under the inert atmosphere to form a modified cellulose solution under the inert atmosphere;
- and
- adjusting the modified cellulose solution to a second temperature from about 90° C. to about 120° C., wherein the dissolved modified cellulose has a molecular weight from about 80% to about 100% of the molecular weight of the predissolved modified cellulose.
2 more elements
Dependencies are inferred from the claim text.