US 11,873,350 B2
Dissolution of oxidized cellulose
Valentino J. Tramontano, Brockton, MA (US); Joshua Kennedy, Somerville, MA (US); Philip D. Blaskovich, Salem, MA (US); Rachit Ohri, Framingham, MA (US); Daniel S. Costa, Somerville, MA (US); and Sajida Farooqi, Hamden, CT (US)
Assigned to Covidien LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on Apr. 19, 2021, as Appl. No. 17/233,694.
Application 17/233,694 is a continuation of application No. 15/353,997, filed on Nov. 17, 2016, granted, now 10,982,012.
Application 15/353,997 is a continuation of application No. 14/129,187, granted, now 9,522,963, issued on Dec. 20, 2016, previously published as PCT/US2012/044692, filed on Jun. 28, 2012.
Claims priority of provisional application 61/502,567, filed on Jun. 29, 2011.
Prior Publication US 2021/0238314 A1, Aug. 5, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08B 16/00 (2006.01); C08K 3/16 (2006.01); C08K 5/20 (2006.01); C08K 5/3415 (2006.01); C08J 3/09 (2006.01); C08B 15/02 (2006.01); C08J 3/12 (2006.01); C08L 1/04 (2006.01); A61K 9/16 (2006.01)
CPC C08B 16/00 (2013.01) [C08B 15/02 (2013.01); C08J 3/091 (2013.01); C08J 3/096 (2013.01); C08J 3/12 (2013.01); C08K 3/16 (2013.01); C08K 5/20 (2013.01); C08K 5/3415 (2013.01); C08L 1/04 (2013.01); A61K 9/1652 (2013.01); C08J 2301/02 (2013.01); C08J 2301/04 (2013.01)] 22 Claims
 
1. A process comprising:
forming a mixture by contacting an oxidized cellulose with a solvent to form a swelled oxidized cellulose;
adjusting the mixture to a first temperature;
contacting the swelled oxidized cellulose with a salt to form an oxidized cellulose solution; and
adjusting the oxidized cellulose solution to a second temperature lower than the first temperature, wherein dissolved oxidized cellulose of the oxidized cellulose solution retains from about 80% to about 120% of a degree of oxidation of the oxidized cellulose prior to dissolution or from about 80% to about 120% of a molecular weight of the oxidized cellulose prior to dissolution.