US 2019/0271885 Al  48  Sep.5,2019  [0420]  A presence of the specific acid or a salt thereof in  the retardation layer or the alignment layer in the optical film  manufactured in each of Examples was confirmed by time› of-flight secondary ion mass spectrometry (TOP-SIMS).  [0414]  Furthermore, the Re change rate 2 is calculated by  the following equation.  [0413]  Furthermore, a comparative optical film was manu› factured without use of an additive of each of Examples and  Comparative Examples, and according to the same proce› dure as above, the in-plane retardation Re of the comparative  optical film before being left to stand in a wet heat envi› ronment (initial Re2) and the in-plane retardation Re of the  comparative optical film after being left to stand in a wet  heat environment (Re2 after standing) were compared to  each other to calculate a Re change rate 2.  [0412]  Furthermore, the Re change rate 1 is calculated by  the following equation.  [0415]  A difference between the Re change rate 2 and the  Re change rate 1 (Re change rate 2-Re change rate 1) was  evaluated according to the following standard. As the dif› ference is greater, suppression of a change in the retardation  is intended.  [0416]  A: The difference is 20% or more.  [0417]  B: The difference is 10% or more and less than  20%.  [0418]  C: The difference is less than 10%.  [0419]  In addition, the initial Rel, the Rel after standing,  the initial Re2, and the Re2 after standing are retardations at  a wavelength of 550 nm.  Re change rate !(%)~{(Initial Rel-Rel after stand- ing)/Initial Rel }xl00  Re change rate 2(%)~{(Initial Re2-Re2 after stand› ing)/Initial Re2}x100  TABLE 3  Retardation layer  ______  A_li~g_nm_en_t_l~ay~e_r _____  Type of liquid crystal  pKa (A) of Additive  Narue  Type of polymer  compound  core  Type  Exaruple 1  Alignment film D-1  PVA(D-1)  Compound A-1  8.30  Additive B-1  Exaruple 2  Photoalignment film C-1  Polymer C-1  Compound A-1  8.30  Additive B-1  Exaruple 3  Alignment film D-1  PVA(D-1)  Compound A-1  8.30  Additive B-2  Exaruple 4  Photoalignment film C-1  Polymer C-1  Compound A-1  8.30  Additive B-2  Exaruple 5  Alignment film D-1  PVA(D-1)  Compound A-2  8.47  Additive B-1  Exaruple 6  Photoalignment film C-1  Polymer C-1  Compound A-2  8.47  Additive B-1  Exaruple 7  Alignment film D-1  PVA(D-1)  Compound A-2  8.47  Additive B-3  Exaruple 8  Photoalignment film C-1  Polymer C-1  Compound A-2  8.47  Additive B-3  Exaruple 9  Alignment film D-1  PVA(D-1)  Compound A-3  8.82  Additive B-1  Exaruple 10  Photoalignment film C-1  Polymer C-1  Compound A-3  8.82  Additive B-1  Exaruple 11  Alignment film D-1  PVA(D-1)  Compound A-3  8.82  Additive B-4  Exaruple 12  Photoalignment film C-1  Polymer C-1  Compound A-3  8.82  Additive B-4  Exaruple 13  Alignment film D-1  PVA(D-1)  Compound A-4  9.56  Additive B-1  Exaruple 14  Photoalignment film C-1  Polymer C-1  Compound A-4  9.56  Additive B-1  Exaruple 15  Alignment film D-1  PVA(D-1)  Compound A-4  9.56  Additive B-5  Exaruple 16  Photoalignment film C-1  Polymer C-1  Compound A-4  9.56  Additive B-5  Exaruple 17  Alignment film D-1  PVA(D-1)  Compound A-1  8.30  Additive B-1  Exaruple 18  Photoalignment film C-2  Polymer C-2  Compound A-1  8.30  Additive B-1  Exaruple 19  Alignment film D-1  PVA(D-1)  Compound A-1  8.30  Additive B-2  Exaruple 20  Photoalignment film C-2  Polymer C-2  Compound A-1  8.30  Additive B-2  Additive  pKa (B) of  Addition aruount vs. Relational  conjugate acid of  liquid crystal  formula  Wet heat  additive  Additive layer  mol (%)  (A)- (B)  resistance  Exaruple 1  -13.5  Liquid crystal layer  0.67  21.80  A  Exaruple 2  -13.5  Photoalignment film layer  0.67  21.80  A  Exaruple 3  -12.0  Liquid crystal layer  0.67  20.30  B  Exaruple 4  -12.0  Photoalignment film layer  0.67  20.30  B  Exaruple 5  -13.5  Liquid crystal layer  0.67  21.97  A  Exaruple 6  -13.5  Photoalignment film layer  0.67  21.97  A  Exaruple 7  -11.6  Liquid crystal layer  0.67  20.02  B  Exaruple 8  -11.6  Photoalignment film layer  0.67  20.02  B  Exaruple 9  -13.5  Liquid crystal layer  0.67  22.32  A  Exaruple 10  -13.5  Photoalignment film layer  0.67  22.32  A  Exaruple 11  -14.9  Liquid crystal layer  0.67  23.72  A  Exaruple 12  -14.9  Photoalignment film layer  0.67  23.72  A  Exaruple 13  -13.5  Liquid crystal layer  0.67  23.06  A  Exaruple 14  -13.5  Photoalignment film layer  0.67  23.06  A  Exaruple 15  -13.5  Liquid crystal layer  0.67  23.06  A  Exaruple 16  -13.5  Photoalignment film layer  0.67  23.06  A  Exaruple 17  -13.5  Liquid crystal layer  2.01  21.80  A  Exaruple 18  -13.5  Photoalignment film layer  0.67  21.80  A  Exaruple 19  -12.0  Liquid crystal layer  2.01  20.30  B  Exaruple 20  -12.0  Photoalignment film layer  0.67  20.30  B 