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Mixtures for producing transparent plastics, transparent plastics and method for their production and use

A technology of transparent plastics and mixtures, which is applied in the field of ophthalmic lenses, the preparation of transparent plastic mixtures, and the production of optical lenses. It can solve the problems of unsatisfactory impact strength and achieve high Abbe value, low dispersion, and high refractive index.

Inactive Publication Date: 2007-02-28
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these lenses is that their mechanical properties
For example, impact strength in particular does not meet many requirements

Method used

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  • Mixtures for producing transparent plastics, transparent plastics and method for their production and use
  • Mixtures for producing transparent plastics, transparent plastics and method for their production and use
  • Mixtures for producing transparent plastics, transparent plastics and method for their production and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0243] Synthesis of Thiomethacrylate Mixtures

[0244] 75.36 g of 1,2-ethanedithiol were weighed into an Erlenmeyerkolben with protective gas introduction and stirred, and 416.43 g of a 13% strength NaOH solution were added within 30 minutes at 25 to 30° C. , metered in under water cooling. A clear brownish solution formed.

[0245] 178.64 g of methacrylic anhydride and mercaptan sodium salt solution were subsequently metered in parallel at the desired metering temperature within 45 minutes into the previously charged and stirred ethyl acetate / water in the reaction flask. Here, if appropriate, protective gas is passed through the mixed batch. The contents of the flask were typically cooled by about 2°C at the start of the addition and a slightly exothermic reaction started after about 5-10 minutes, which meant subsequent cooling down accordingly to maintain the desired reaction temperature (35°C). After the addition had ended, the mixed batch was stirred for a further 5 min...

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PUM

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Abstract

The invention relates to mixtures for producing transparent plastics, comprising a) a prepolymer, produced from the compounds of formulae (I) and (II), wherein R<1> independently represents hydrogen or a methyl group, R<2> independently represents a linear or branched, aliphatic or cycloaliphatic group or a substituted or unsubstituted aromatic or heteroaromatic group and m and n independently represent an integer greater or equal 0, with m + 1 > 0, and compounds of formula (III), alkyldithiols or polythiols, preferably HS-R<3>-SH (III), wherein R<3> is equal or different from R<2> and can have the meaning indicated in R<2>, and b) at least one radically polymerizable monomer (A) having at least two methacrylate groups and c) aromatic vinyl compounds, such as styrene and d) optionally a radically polymerizable monomer having at least two terminal olefinic groups that have different reactivity, and / or e) optionally at least one monomer (B) from the group of methacrylates, preferably 2-hydroxyethylmethacrylate.

Description

technical field [0001] The invention relates to mixtures for the production of transparent plastics. The invention further relates to transparent plastics which can be produced from this mixture, and to a process for their production. The invention also relates to the use of transparent plastics for the production of optical lenses, especially ophthalmic lenses. Background technique [0002] Glasses are now no longer indispensable in everyday life. Among them, spectacles with plastic lenses have recently received particular attention because they are lighter and less shatterable than spectacle lenses made of inorganic materials and can be colored with suitable dyes. For the production of plastic spectacle lenses, thiourethane compounds which can be formed, for example, from diethylene glycol bis(allyl carbonate) (DAC), with α,ω-terminated multiple bonds or sulfur-containing (formazol) are generally used. Base) Acrylic ester is a high-transparency plastic obtained as a raw...

Claims

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Application Information

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IPC IPC(8): C08F220/38C08F228/00
CPCC08F228/00
Inventor B·施密特P·哈特曼
Owner ROHM CO LTD
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