US 11,939,407 B2
Regioselectively substituted cellulose esters
Casey Lynn Elkins, Kingsport, TN (US); Robert Jacks Sharpe, Madison, AL (US); and Bin Wang, Kingsport, TN (US)
Assigned to Eastman Chemical Company, Kingsport, TN (US)
Filed by Eastman Chemical Company, Kingsport, TN (US)
Filed on Jan. 26, 2023, as Appl. No. 18/160,009.
Application 18/160,009 is a continuation of application No. 16/492,966, granted, now 11,591,411, previously published as PCT/US2018/024805, filed on Mar. 28, 2018.
Claims priority of provisional application 62/478,385, filed on Mar. 29, 2017.
Prior Publication US 2023/0167201 A1, Jun. 1, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C08B 3/16 (2006.01); C08B 3/06 (2006.01); C08B 3/08 (2006.01); C08J 5/18 (2006.01)
CPC C08B 3/16 (2013.01) [C08B 3/06 (2013.01); C08B 3/08 (2013.01); C08J 5/18 (2013.01); C08J 2301/10 (2013.01); C08J 2301/12 (2013.01); C08J 2301/14 (2013.01)] 17 Claims
 
1. A regioselectively substituted cellulose ester comprising:
(i) a plurality of R1—CO— substituents;
(ii) a plurality of R4—CO— substituents;
(iii) a plurality of hydroxyl substituents,
wherein the degree of substitution of R1—CO— at the C2 position (“C2DSR1-CO”) is in the range of from about 0.2 to about 1.0,
wherein the degree of substitution of R1—CO— at the C3 position (“C3DSR1-CO”) is in the range of from about 0.2 to about 1.0,
wherein the degree of substitution of R1—CO— at the C6 position (“C6DSR1-CO”) is in the range of from about 0 to about 0.5,
wherein the degree of substitution of R4—CO— at the C6 position (“C6DSR4-CO”) is in the range of from about 0.1 to about 1.0,
wherein the degree of substitution of hydroxyl is in the range of from about 0 to about 2.6,
wherein R1 is (C6-20)aryl, wherein the aryl is unsubstituted or substituted by 1 to 6 R2 groups, and
wherein R2 is chosen from (C1-6)alkyl, halo(C1-6)alkyl, (C1-6)alkoxy, halo(C1-6)alkoxy, halo, (C3-7)cycloalkyl, (C6-10)aryl, or nitro,
wherein R4 is (C1-20)alkyl.