Patent ID: 8491824
Filing Date: 2013-07-23
Classification: B29C,B29D,B29L,Y10S

Abstract:
1. A method of producing a contact lens, comprising: directing a molten thermoplastic material into a mold cavity, thereby forming a first contact lens mold section comprising the thermoplastic material in the mold cavity, wherein the mold cavity comprises a first optical quality insert surface; an opposing second surface; a mold flange-defining region circumscribing the first optical quality insert surface and the second surface, the first optical quality insert surface and the second surface defining a first lens-defining surface and a second substantially opposing surface of a contact lens mold section; and an elongated channel extending substantially radially outwardly from the mold flange-defining region, the elongated channel including a first portion having a substantially uniform width and a second portion having a divergent width, the second portion being adjacent the flange-defining region and being thinner than the first portion of the elongated channel; providing a complementary second contact lens mold section; placing a polymerizable composition onto a concave lens defining surface of one of the first mold section or the second mold section; placing the other one of the first mold section or the second mold section on top of the one of the first mold section or the second mold section to enclose the composition within a lens shaped region defined therebetween; coupling together the first and second mold sections which define the lens-shaped region and contain the enclosed composition to form a mold assembly; and subjecting the mold assembly to polymerizing conditions to produce a polymer article in the shape of a contact lens.