Patent ID: 8861083

Claim:
A birefringence pattern builder which is used in a method of producing a patterned birefringent product comprising a step of patterned light exposure of an optically anisotropic layer and a step of heating the layer after the light exposure to 50° C. or higher but not higher than 400° C., said birefringence pattern builder comprising the optically anisotropic layer, a support, and a laminate film in this order, and said laminate film comprising an adhesive layer and a laminate substrate in this order from the side of the support, said adhesive layer bonding the laminate substrate and the support, and having adhesivity easily delaminated from the support after adhesion or adhesivity easily delaminated from the support in a process of preparation of a birefringence pattern using the birefringence pattern builder, wherein the birefringence pattern builder satisfies either (a) or (b) below: (a) the average film thickness of the adhesive layer is 1.0 micrometer or more and Rt of the surface of the laminate film opposite to the surface bonded to the support is 1.0 micrometer or more, wherein Rt is the difference between the highest point and the lowest point of a profile curve of the surface; (b) the average film thickness of the adhesive layer is 1 micrometer or less and Rt of the surface of the laminate film opposite to the surface bonded to the support is 2.0 micrometers or more.