CPC C08B 3/16 (2013.01) [B32B 7/12 (2013.01); B32B 23/08 (2013.01); B32B 27/06 (2013.01); B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/22 (2013.01); B32B 27/24 (2013.01); B32B 27/281 (2013.01); B32B 27/325 (2013.01); B32B 27/36 (2013.01); B32B 27/365 (2013.01); C08L 1/14 (2013.01); G02B 5/3033 (2013.01); G02B 5/305 (2013.01); G02B 5/3083 (2013.01); G02F 1/13363 (2013.01); H10K 50/846 (2023.02); H10K 50/86 (2023.02); B32B 2307/40 (2013.01); B32B 2307/516 (2013.01); B32B 2307/518 (2013.01); B32B 2307/546 (2013.01); B32B 2307/732 (2013.01); B32B 2309/105 (2013.01); B32B 2457/202 (2013.01); B32B 2457/206 (2013.01); C08L 1/08 (2013.01); C08L 1/10 (2013.01); C09K 2323/03 (2020.08); C09K 2323/035 (2020.08); G02F 1/133638 (2021.01); G02F 2413/13 (2013.01)] | 20 Claims |
1. A regioselectively substituted cellulose ester comprising:
(a) a plurality of chromophore-acyl substituents; and
(b) a plurality of pivaloyl substituents,
(c) a plurality of (C1-6)alkyl-acyl substituents,
wherein the cellulose ester has a hydroxyl degree of substitution (“DSOH”) in the range of from 0 to 0.9,
wherein the cellulose ester has a pivaloyl degree of substitution (“DSPv”) in the range of from 0.1 to 1.2,
wherein the cellulose ester has a chromophore-acyl degree of substitution (“DSCh”) in the range of from 0.4 to 1.6, and
wherein the regioselectivity is such that the sum of the chromophore-acyl degree of substitution at C2 and C3 (“C2DSCh” and “C3DSCh”) minus the chromophore-acyl degree of substitution at C6 (“C6DSCh”) is between 0.1 and 1.6,
wherein the chromophore-acyl is chosen from a heteroaryl-acyl, wherein the heteroaryl is a 5- to 10-membered ring having 1- to 4- heteroatoms chosen from N, O, or S, and wherein the heteroaryl is unsubstituted or substituted by 1-5 R1;
wherein each R1 is independently chosen from nitro, cyano, (C1-6)alkyl; halo(C1-6)alkyl; (C6-20)aryl-CO2-; (C6-20)aryl; (C1-6)alkoxy; halo(C1-6)alkoxy; halo; 5- to 10-membered heteroaryl having 1-4 heteroatoms chosen from N, O, or S; or
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