Patent ID: 6590036
Filing Date: 2003-07-08
Classification: B29C,B29D,B29K,G02B

Abstract:
A method for producing a graded-refractive-index optical plastic material, which comprises:melting an amorphous fluoropolymer (a) which substantially has no Câ€”H bonds and which has a fluorine-containing alicyclic structure on its main chain; injecting at least one material (b), which differs from the fluoropolymer (a) or the fluoropolymer (a) containing material (b) in refractive index by at least 0.001, into the center of the melt of fluoropolymer (a); and molding the melt while or after diffusing material (b) into fluoropolymer (a) or fluoropolymer (a) containing material (b) to form a region wherein the refractive index varies continuously.