Patent ID: 6201045
Filing Date: 2001-03-13
Classification: C08K,C08L,G02B,G02F,Y10S

Abstract:
A process of exhibiting no orientation birefringence of a polymeric resin material comprising rendering an orientation birefringence of a low molecular weigh substance added to a matrix including a transparent polymeric resin material to offset an orientation birefringence caused in the polymeric resin material in conjunction with an orientation of a polymeric chain of the polymeric resin material due to an external force caused by a molding process when the external force is applied to the optical resin material including the matrix, wherein said low molecular weight substance is oriented in conjunction with an orientation of the polymeric chain of the polymeric resin material caused by the external force, thereby exhibiting a specific orientation birefringence which further exhibits a symbol inverse to that in said orientation birefringence of the polymeric resin material caused when said polymeric chain of the polymeric resin material is oriented by the external force, and further an addition amount of the low molecular weight substance is adjusted in accordance with proportions of values between said orientation birefringence of the polymeric resin material and that of said low molecular weight substance to render the latter to offset the former, thereby to exhibit non-birefringence as a whole.