Mixtures for producing transparent plastics, transparent plastics, method for producing the same and the use thereof

A technology of transparent plastics and mixtures, which is applied in the production of optical lenses, ophthalmic lenses, and the preparation of transparent plastic mixtures. It can solve problems such as unsatisfactory impact strength, achieve excellent mechanical properties, good impact strength, and increase wearing comfort.

Inactive Publication Date: 2007-02-07
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, method for producing the same and the use thereof
  • Mixtures for producing transparent plastics, transparent plastics, method for producing the same and the use thereof
  • Mixtures for producing transparent plastics, transparent plastics, method for producing the same and the use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0241] Synthesis of Thiomethacrylate Mixtures

[0242] 75.36 g of 1,2-ethanedithiol were weighed into an Erlenmeyer flask with protective gas introduction and stirred, and 416.43 g of a 13% strength NaOH solution were cooled in water at 25 to 30 °C within 30 minutes Add in the next meter. A clear brownish solution formed.

[0243] 178.64 g of methacrylic anhydride and Na thiol solution were subsequently metered in parallel at the desired metering temperature within 45 minutes to the stirred initial charge of 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 minutes at 35°C and then ...

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Abstract

The invention relates to mixtures for producing transparent plastics, which comprise 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 a number greater or equal 0 with m + n > 0, and the compounds of formula (Ill), alkyl dithiols or polythiols, preferably HS-R<3>-SH (Ill), wherein R<3>, which is the same or different from R<2>, 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 e.g. 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-hydroxyethyl methacrylate.

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 have now become 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 (formyl Base) Acrylic ester is a high-transparency plastic obtained as a raw material. [0003] DAC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F228/00
CPCC08F228/00C08G63/688C08G75/00C08G75/26
Inventor B·施米特P·哈特曼
Owner ROHM CO LTD
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