Method for production of plastic lens
AssigneeHoya Corporation
InventorsShinsuke Itoh, Masahisa Kousaka
Life of this patent
Estimating the term…
Abstract
A process for producing a plastic lens which comprises preparing a prepolymer comprising sulfur by bringing at least one compound having epithio group, sulfur and a portion of a polythiol compound into reaction with each other and, thereafter, adding rest of the polythiol compound to the prepared prepolymer comprising sulfur and allowing polymerization to proceed. A plastic lens of excellent quality which exhibits excellent weatherability in combination with a great refractive index, a great Abbe number and excellent transparency is produced.
Claims13
A process for producing a plastic lens which comprises preparing a prepolymer comprising sulfur by bringing at least one compound having an epithio group, sulfur and a portion of a polythiol compound into reaction with each other and, thereafter, adding the rest of the polythiol compound to the prepared prepolymer comprising sulfur and allowing polymerization to proceed.
Dependencies are inferred from the claim text.