US 2019/0271885 Al  33  Sep.5,2019  -continued  [0225]  Components other than the above-mentioned liquid  crystal compound represented by Formula  (I)  may also be  included in the polymerizable liquid crystal composition.  Hereinafter, the optional components will be described in  detail.  [0226]  The polymerizable liquid crystal composition pref› erably includes a polymerization initiator.  [0227]  As the polymerization initiator, a photopolymer› ization initiator capable of initiating a polymerization reac› tion upon irradiation with ultraviolet rays is preferable.  the organic solvents) which may be included in the compo› sition for forming an alignment layer.  [0232]  The polymerizable liquid crystal composition may  include other components than the above components, and  examples of such other components include an antioxidant  (for example, a phenol-based antioxidant), a liquid crystal  compound other than the above liquid crystal compounds,  an air interface alignment agent (leveling agent), a surfac› tants, a tilt angle control agent, an alignment aid, a plasti› cizer, and a crosslinking agent.  [0233]  <Method for Producing Optical Film>  [0234]  A method for producing the optical film is not  particularly limited as long as it can produce an alignment  layer or retardation layer having the above-described con› figuration. Hereinafter, a method for producing each of the  layers will be described in detail.  [0228]  Examples of the photopolymerization initiator  include a-carbonyl compounds (described in each of the  specifications of U.S. Pat. Nos. 2,367,661A and 2,367,  670A), acyloin ethers (described in the specification of U.S.  Pat. No. 2,448,828A), a-hydrocarbon-substituted aromatic  acyloin compounds (described in the specification of U.S.  Pat. No. 2,722,512A), multinuclear quinone compounds (as  described in each of the specifications of U.S. Pat. Nos.  3,046,127 A and 2,951,758A), combinations oftriarylimida› zole dimer and p-aminophenyl ketone (as described in the  specification of U.S. Pat. No. 3,549,367 A), oxadiazole com› pounds (described in the specification of U.S. Pat. No.  4,212,970A), and acyl phosphine oxide compounds (de› scribed in each of the specifications of JP1988-040799B  (JP-S63-040799B), JP! 993-029234B (JP-H0S-029234B),  JP! 998-095788A (JP-Hl 0-095788A), and JP1998-029997 A  (JP-Hl 0-029997 A)).  [0235]  (Method of Producing Alignment Layer)  [0236]  As a method for producing the alignment layer, a  known method can be appropriately adopted and used.  [0237]  Examples of the method include a method in which  a composition for forming an alignment layer is applied to  form a coating film and the coating film is subjected to a  rubbing treatment to obtain an alignment layer.  [0238]  The above-mentioned known polymer for an align› ment layer is preferably included in the composition for  forming an alignment layer.  [0239]  A method for applying the composition for forming  an alignment layer is not particularly limited and can be  appropriately selected depending on the purpose, and  examples thereof include spin coating, die coating, gravure  coating, flexographic printing, and ink jet printing.  [0240]  Examples of the method for a rubbing treatment  include known methods.  [0241]  Moreover, in a case where an alignment layer  including a specific acid or a salt thereof is formed,  examples of a method for forming the alignment layer  include a method in which an alignment layer is formed by  the above-mentioned procedure using a composition for  forming an alignment layer, including a specific acid or a salt  thereof.  [0242]  The total content of the specific acid and a salt  thereof in the composition for forming an alignment layer is  not particularly limited, and the total content of the specific  [0229]  In a case where the polymerizable liquid crystal  composition includes a polymerization initiator, the content  of the polymerization initiator is preferably 0.5 to 10 parts  by mass, and more preferably 1 to 10 parts by mass, with  respect to 100 parts by mass of the liquid crystal compound  represented by Formula  (I)  included in the polymerizable  liquid crystal composition.  [0230]  The polymerization initiator may be used alone or  in combination of two or more kinds thereof. In a case where  two or more kinds of the polymerization initiators are used,  the total content thereof is preferably within the range.  [0231]  It is preferable that the polymerizable liquid crystal  composition includes a solvent from the viewpoint of work› ability for forming a retardation layer. The type of the  solvent is not particularly limited, and examples of the  solvent include the above-mentioned solvents (particularly  Structure  S  ’-::::N  H0-0-0H  pKa  8.82 