High refractive index polarizing lens

Abstract

A polyurethane based high refractive index polarizing lens consisting of a polarizing film and a cured monomer mixture placed on both sides of said polarizing film, in which the polarizing film consists of a heated polyvinyl alcohol having a water content of 4.5% or less, and the cured monomer mixture comprises a polyisocyanate and a polythiol, has no problems such as the generation of bubbles, and has excellent adhesiveness. A manufacturing method for high refractive index polarizing lenses including a process for forming lens layers comprising a polyurethane based polymer formed from polyisocyanate and polythiol on both surfaces of a polarizing film, characterized by using a polarizing film whereof the water content is 4.5 wt % or less as the aforementioned polarizing film.

1 . A polarizing lens consisting of a polarizing film and a cured monomer mixture placed on both sides of said polarizing film, wherein said polarizing film consists of a heated polyvinyl alcohol having a water content of 4.5% or less, and said cured monomer mixture comprises a polyisocyanate and a polythiol,
 said polarizing lens being manufactured by a method comprising the steps of:   heating and drying a polarizing film comprising a polyvinyl alcohol at a temperature lower than a glass transition point of said polyvinyl alcohol such that a water content of said polarizing film is 4.5 wt % or less;   placing said polarizing film inside a mold set for lens casting;   filling a gap between each of said molds and said polarizing film with a monomer mixture comprising a polyisocyanate and a polythiol; and   curing said monomer mixture by polymerization.   
     
     
         2 . The polarizing lens of  claim 1 , wherein said method further comprises a step of fitting said molds on both sides of a gasket.