Polymerizable composition for plastic lens and method of preparing plastic lens using same
AssigneeSkc Co., Ltd.
InventorsSeung Mo Hong, Jung Hwan Myung, Junghwan Shin
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Abstract
An embodiment relates to a polymerizable composition for a plastic lens. The polymerizable composition for a plastic lens according to the embodiment comprises a nonhalogenated tin-based catalyst and a diketone compound as a low-temperature reaction rate controlling agent. Accordingly, the polymerizable composition has a more stable pot life so that the polymerization rate can be appropriately controlled, thereby improving the reactivity and the workability, and that the generation of bubbles are prevented, thereby improving the transparency of the resin.
Claims17
A polymerizable composition for a plastic lens, which comprises:
- a bi- or higher functional isocyanate compound;
- a bi- or higher functional thiol compound having at least one sulfide bond or at least one ester bond;
- a catalyst comprising a nonhalogenated tin-based catalyst, said nonhalogenated tin-based catalyst being contained in an amount of 5 ppm to 1,000 ppm based on the total weight of the isocyanate compound and the thiol compound;
- and
- a diketone-based low-temperature reaction rate controlling agent in an amount of 5 to 90% by weight based on the weight of the nonhalogenated tin-based catalyst.
A process for preparing a polythiourethane-based plastic lens, which comprises:
- providing a polymerizable composition for a plastic lens comprising a bi- or higher functional isocyanate compound;
- a bi- or higher functional thiol compound having at least one sulfide bond or at least one ester bond;
- a catalyst comprising a nonhalogenated tin-based catalyst;
- and a diketone-based low-temperature reaction rate controlling agent in an amount of 5 to 90% by weight based on the weight of the nonhalogenated tin-based catalyst, wherein the nonhalogenated tin-based catalyst is employed in an amount of 5 ppm to 1,000 ppm based on the total weight of the isocyanate compound and the thiol compound;
- and
- thermally curing the polymerizable composition in a mold.
A polymerizable composition for a plastic lens, which comprises:
- a bi- or higher functional isocyanate compound;
- a bi- or higher functional thiol compound having at least one sulfide bond or at least one ester bond;
- a catalyst comprising a nonhalogenated tin-based catalyst, said nonhalogenated tin-based catalyst being contained in an amount of 5 ppm to 1,000 ppm based on the total weight of the isocyanate compound and the thiol compound;
- and
- a low-temperature reaction rate controlling agent in an amount of 5 to 90% by weight based on the weight of the nonhalogenated tin-based catalyst,
- wherein the polymerizable composition satisfies the following Equation 1, when the changes in viscosity (Y) are measured with respect to time (X) at 10° C.:
- Δln Y =b ×ΔX Equation 1
- wherein Δln Y is ln YX-ln Y0, Y0 is the initial (x =0) viscosity (cps) of the polymerizable composition at a temperature of 10° C., YX is the viscosity (cps) of the polymerizable composition at a temperature of 10° C. after X hour(s) elapse, ΔX is from 0.01 hour to 30 hours, and b is from 0.1 hour−1 to 0.5 hour−1.
Dependencies are inferred from the claim text.