Composition for optical materials, process for production thereof, and optical materials made from the composition
a technology of optical materials and compositions, applied in the field of composition, can solve problems such as massive loss, clouded, and defective compositions, and achieve the effects of reducing production costs, reducing production costs, and reducing production costs
Inactive Publication Date: 2012-12-06
MITSUBISHI GAS CHEM CO INC
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Benefits of technology
[0024]According to the present invention, it has now become possible to provide, for example, a composition for an optical material containing polythiol which can be estimated, on a pre-polymerization / curing stage, as being clouded or not clouded after being polymerized and thus cured, and so can be determined as being good or defective. Provision of such a composition has been difficult with the conventional art.
Problems solved by technology
However, these composition containing thiol have a problem of being clouded when being polymerized and thus cured.
Therefore, if the composition are clouded after being cured, the composition become all defective.
This causes a massive loss.
Method used
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Effect test
example 1
[0057]A composition for an optical material, and an optical material, according to the present invention were produced by use of bis(1-mercaptoethyl)sulfide having an initial turbidity of 0.15 and a turbidity of 0.15 after storage at 50° C. for 7 days in accordance with production method A described below. The transparency of the obtained optical material was good and “4”. The results are shown in Table 1.
examples 2 through 6
[0058]A composition for an optical material, and an optical material, according to the present invention were produced by use of bis(2-mercaptoethyl)sulfide having an initial turbidity and a turbidity after storage at 50° C. for 7 shown in Table 1 in accordance with the production method shown in Table 1. The results are shown in Table 1.
examples 7 through 12
[0059]A composition for an optical material, and an optical material, according to the present invention were produced by use of 1,3-bis(mercaptomethyl)benzene having an initial turbidity and a turbidity after storage at 50° C. for 7 shown in Table 1 in accordance with the production method shown in Table 1. The results are shown in Table 1.
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Abstract
The present invention has an object of providing, for example, a composition for optical materials which contains a polythiol that can be predicted and assessed, in a stage prior to polymerization / curing, as being clouded or not clouded after polymerization / curing, and thus can be determined as being good or defective. According to the present invention, the above-described object is achieved by, for example, a composition for optical materials which comprises a polythiol that exhibits an initial turbidity of 0.5 ppm or less and a turbidity of 0.6 ppm or less after the storage at 50° C. for 7 days, and an episulfide. Namely, an optical material made from a composition for optical materials which contains a polythiol satisfying the above turbidity requirements can be prevented from clouding to exhibit excellent transparency.
Description
TECHNICAL FIELD[0001]The present invention relates to, for example, a composition for an optical material, and specifically to, for example, a composition for an optical material which is preferable for an optical material such as a plastic lens, a prism, an optical fiber, an information recording substrate, a filter or the like, especially a plastic lens.BACKGROUND ART[0002]Plastic materials are lightweight, highly tough and easy to be dyed, and therefore are widely used recently for various types of optical materials, especially eyeglass lenses. Optical materials, especially eyeglass lenses, are specifically required to have, as physical properties, low specific gravity, high transparency and low yellow index, high heat resistance, high strength and the like, and as optical properties, high refractive index and high Abbe number. A high refractive index allows a lens to be thinner, and a high Abbe number reduces the chromatic aberration of a lens. However, as the refractive index i...
Claims
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Login to View More IPC IPC(8): C08G75/08
CPCC08L81/02C08G75/08G02B1/041
Inventor TAKEMURA, KOUHEIHORIKOSHI, HIROSHI
Owner MITSUBISHI GAS CHEM CO INC