Polysiloxane resin containing optically-functional constituents and transparent optically-functional element obtained therefrom

A method of manufacturing an organopolysiloxane material containing an optically-functional constituent, the method comprising mixing

• 100parts by weight of an organopolysiloxane resin having a substitution number of monovalent organic groups per silicon atom within the range of 0.5 to 1.5 wherein the monovalent organic groups substituted on the silicon atoms of the organopolysiloxane resin are monovalent hydrocarbon groups or halogen-substituted monovalent hydrocarbon groups having 1 to 15 carbon atoms and the organopolysiloxane resin contains 0.01 to 10 weight percent of hydroxyl groups on silicon atoms and
• 10 to 200 parts by weight of an optically-functional constituent represented by the formula
• A-›R.sup.1 SiR.sup.2.sub.3-n (OR.sup.3).sub.n !p
• wherein A is an optically-functional organic group containing aromatic hydrocarbon groups where at least one of the aromatic hydrocarbon groups is bonded to R.sup.1 which is an alkylene group having 1 to 18 carbon atoms, R.sup.2 is a monovalent hydrocarbon group or a halogen-substituted hydrocarbon groups having 1 to 15 carbon atoms, R.sup.3 is an alkyl group having 1 to 6 carbon atoms, n is an integer from 1 to 3, and p is an integer from 1 to 3 wherein the optically-functional organic group is selected from groups consisting of phthalocyanine groups, porphyrin groups, tetraphenylbutadiene groups, azobenzene groups, bis(4-dimethylaminodithiobenzyl)-nickel groups and anthracene groups.