Regioselectively substituted cellulose ester based negative birefringent compensation films having improved wavelength dispersion

A film, comprising:

• (1) a regioselectively substituted cellulose ester comprising:
• (i) a plurality of aromatic-CO— substituents;
• (ii) a plurality of a first unsaturated or saturated (C1-6)alkyl-CO— substituents;
• and
• (iii) a plurality of hydroxyl substituents;
• wherein:
• the degree of substitution for the hydroxyl (“DSOH”) is from 0.2 to 1.1,
• the cellulose ester has a C2 degree of substitution for the aromatic-CO— substituent (“C2DSArCO”) which is from 0.15 to 0.8,
• the cellulose ester has a C3 degree of substitution for the aromatic-CO— substituent (“C3DSArCO”) which is from 0.05 to 0.6,
• the cellulose ester has a C6 degree of substitution for the aromatic-CO— substituent (“C6DSArCO”) which is from 0.05 to 0.6,
• the total degree of substitution for the aromatic-CO— substituent (“TotDSArCO”) which is from 0.25 to 2.0,
• the aromatic-CO— is
• (i) an (C6-20)aryl-CO—, wherein the aryl is unsubstituted or substituted by 1-5 R1;
• (ii) a heteroaryl-CO—, 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;
• and
• (2) a component A that is
• wherein:
• ring A is an (C6-20)aryl or a 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S;
• ring B is (C6-20)aryl or a 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S;
• ring C is (C6-20)aryl a 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S;
• R1 is saturated or unsaturated (C1-20)alkyl;
• saturated or unsaturated halo(C1-20)alkyl;
• (C6-20)aryl optionally by 1-5 substituted by alkyl, haloalkyl, alkoxy, haloalkoxy, halo;
• 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S;
• or —CH2C(O)—R3;
• R2 is independently hydrogen, saturated or unsaturated (C1-20)alkyl, or saturated or unsaturated halo(C1-20)alkyl;
• R3 is saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, (C6-20)aryl, or 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S, wherein the aryl or heteroaryl are unsubstituted or substituted by 1-5 R6;
• R4 is saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, or saturated or unsaturated (C1-20)alkyl-CO—(C1-20)alkyl, wherein each of the groups is unsubstituted or substituted by 1-3 hydroxyl, saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy, saturated or unsaturated halo(C1-20)alkoxy, saturated or unsaturated hydroxy(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-hydroxy(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl-CO—(C1-20)alkyl, saturated or unsaturated (C1-20)alkyl-CO, saturated or unsaturated (C1-20)alkyl-COO, saturated or unsaturated (C1-20)alkyl-O—CO—C(1-20)alkyl, saturated or unsaturated (C1-20)alkyl-COO—C(1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl-COO—(C1-20)alkyl, or (C1-20)alkoxy-(C1-20)alkyl-O—CO—(C1-20)alkyl;
• each R5 is independently hydroxy, cyano, saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy, saturated or unsaturated halo(C1-20)alkoxy, or halo;
• each R6 is independently hydroxy, cyano, saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy, saturated or unsaturated halo(C1-20)alkoxy, or halo or (C6-20)aryl, wherein the aryl is unsubstituted or substituted by 1-5 R7;
• each R7 is independently hydroxyl, saturated or unsaturated (C1-6)alkyl, saturated or unsaturated halo(C1-6)alkyl, or saturated or unsaturated (C1-6)alkoxyl;
• R8 is saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxyl, or saturated or unsaturated halo(C1-20)alkoxyl;
• each R9 is R4—O—, hydroxy, saturated or unsaturated (C1-20)alkyl, saturated or unsaturated hetero(C1-20)alkyl containing 1-2 heteroatoms chosen from N, O or S, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkyl-CO—(C1-20)alkyl-, saturated or unsaturated (C1-20)alkyl-COO—(C1-20)alkyl-, saturated or unsaturated (C1-20)alkyl-COO—, saturated or unsaturated (C1-20)alkyl-O—CO—, saturated or unsaturated (C1-2)alkyl-CO—, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl-CO— O—(C1-2)alkyl, saturated or unsaturated (C1-2)alkoxy-(C1-2)alkyl-O—CO— (C1-2)alkyl, saturated or unsaturated (C1-2)alkoxy-(C1-2)alkyl-CO— (C1-20)alkyl, (C1-20)alkoxy-(C1-20)alkyl-O—CO—(C1-20)alkyl-(C6-10)aryl, 5- to 10-membered heteroaryl containing 1-4 heteroatoms chosen from N, O, or S,
• wherein each of the groups are unsubstituted or substituted by 1-3 hydroxyl, saturated or unsaturated (C1-20)alkyl, saturated or unsaturated halo(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxyl, or saturated or unsaturated halo(C1-20)alkoxyl, saturated or unsaturated hydroxy(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-hydroxy(C1-20)alkyl, or saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl-CO—(C1-20)alkyl-, saturated or unsaturated (C1-20)alkyl-CO, saturated or unsaturated (C1-20)alkyl-COO, saturated or unsaturated (C1-20)alkyl-O—CO—C(1-20)alkyl, saturated or unsaturated (C1-20)alkyl-COO—C(1-20)alkyl, saturated or unsaturated (C1-20)alkoxy-(C1-20)alkyl-COO—(C1-20)alkyl, or (C1-20)alkoxy-(C1-20)alkyl-O—CO—(C1-20)alkyl;
• each n is 0, 1, 2, 3, 4, or 5;
• each m is 0, 1, 2, 3, or 4;
• and
• k is 0, 1, 3, or 4,
• wherein:
• component A is present at less than 30 wt %, based on the total weight of the film,
• the thickness of the film (“d”) (μm) is from 10 μm to 200 μm,
• the film exhibits a Re(589 nm) that is less than zero,
• the ratio of the Re(589 nm) and d (nm) multiplied by 1000 is from −10 to −0.5,
• the ratio of the Rth (589 nm) and d (nm) multiplied by 1000 is from −6.0 to 6.0,
• the film exhibits a [[—Rth(589 nm)/Re(589 nm)]+0.5](“Nz”) is from −3.0 to 3.0,
• each Re(589 nm) is the in-plane retardation measured at 589 nm,
• each Rth(589 nm) is the out-of-plane retardation measured at 589 nm, and the film is stretched.