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Polyether-based polyurethane formulations for the production of holographic media

A polyurethane, polyether polyol technology, applied in information storage, opto-mechanical equipment, recording information storage, etc., can solve the problem of low brightness of holograms

Active Publication Date: 2010-05-26
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, a disadvantage of known polyurethane-based systems, especially for optical applications other than digital data storage, is that the achievable brightness of holograms stored on such media is too low

Method used

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  • Polyether-based polyurethane formulations for the production of holographic media
  • Polyether-based polyurethane formulations for the production of holographic media
  • Polyether-based polyurethane formulations for the production of holographic media

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0149] The examples described below are mentioned for explaining the photopolymer according to the present invention, but cannot be construed as limiting. Unless otherwise stated, all percentages mentioned are percentages by weight.

[0150] Desmodur XP 2410 is an experimental product of Bayer MaterialScience AG, Leverkusen, Germany. Polyisocyanate based on hexane diisocyanate, the proportion of iminooxadiazinedione is at least 30%, and the NCO content: 23.5%

[0151] Desmodur XP 2599 is an experimental product of Bayer MaterialScience AG, Leverkusen, Germany, based on Acclaim 4200 hexane diisocyanate allophanate, NCO content: 5.6-6.4%

[0152] Desmodur XP 2580 is an experimental product of Bayer MaterialScience AG, Leverkusen, Germany. It is an aliphatic polyisocyanate based on hexane diisocyanate with an NCO content of about 20%

[0153] Terathane 1000 is a commercial product of BASF SE, Ludwigshafen, Germany (poly-THF with a number average molar mass of 1000 g / mol).

[0154] Pol...

Embodiment 1

[0203] Example 1 (medium):

[0204] 7.743g of Acclaim 4200 (polypropylene oxide with a number average molar mass of 4000 g / mol) (component B) and 3.75 g of urethane acrylate 1 (component C), 0.15 g of CGI909 and 0.015 g of new methylene blue (with Component E together) were mixed at 60°C and mixed with 0.525 g of N-ethylpyrrolidone (component G) to obtain a clear solution. Thereafter, it was cooled to 30°C, and 2.792g of Desmodur was added XP 2599 (Part A) and mix again. Finally, add 0.0245g of Fomrez UL 28 (Part F) and mix briefly again. The resulting liquid material was then poured onto a glass plate and covered with a second glass plate, which was kept at a distance of 20 μm by spacers. The sample was left at room temperature and cured for 16 hours. Maximum Δn: 0.0158.

Embodiment 2

[0205] Example 2 (medium):

[0206] 7.264g of polyether V 3970 (trifunctional polyether mixture of glycerol-based ethylene oxide and propylene oxide, with a total ethylene oxide fraction of 17.2%, and a number average molar mass of 4800 g / mol) (group Part B) Mix with 3.75g of urethane acrylate 1 (component C), 0.15g of CGI 909 and 0.015g of neomethylene blue (together with component E) at 60°C and mix with 0.525g of N-ethyl The base pyrrolidone (component G) is mixed to obtain a clear solution. After that, it was cooled to 30°C, and 3.269 g of Desmodur was added XP 2599 (Part A) and mix again. Finally, add 0.0480g of Fomrez UL 28 (Part F) and mix briefly again. The resulting liquid material was then poured onto a glass plate and covered with a second glass plate, which was kept at a distance of 20 μm by spacers. The sample was left at room temperature and cured for 16 hours. Maximum Δn: 0.0120.

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Abstract

Polyurethane compositions comprise: (a) a polyisocyanate component; (b) an isocyanate component comprising at least 50 wt.% of polyether polyols with an average molecular weight of greater than 1000 g / mol, which exhibits one or more oxyalkylene units; (c) compounds, which exhibit groups (radiation curable groups) reactive under the effect of actinic radiation with ethylenically unsaturated compounds under polymerization and are free of isocyanate groups; (d) radical stabilizers; (e) photo initiators; (f) optionally catalysts; and (g) optionally auxiliaries and additives.

Description

[0001] Related application [0002] This application claims the priority of European Patent No. 08017277.8 filed on October 1, 2008, the entire content of which is incorporated herein by reference for all beneficial purposes. Background technique [0003] The present invention relates to a novel polyurethane composition, which is advantageous for preparing holographic media, especially for data storage, but also for different types of optical applications. [0004] In the structure of the holographic medium, as described in US 6,743,552, information is stored in a polymer layer, which basically comprises a polymer matrix and a very specific polymerizable monomer uniformly distributed therein. The matrix polymer may be polyurethane based. It is prepared from isocyanate functional materials that are cross-linked with polyols, such as polyethers or polyesters, with the formation of urethane. [0005] US 6,743,552, US 6,765,061 and US 6,780,546 disclose polyether-based PU matrices for ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/50C08G18/72C08G18/78C08G18/67G03H1/02
CPCC08G18/4841C08G18/4825C08G18/7887C08G18/672C08G18/4277C08G18/7837G03F7/001G03F7/027G11B7/245G11B7/24044C08G18/776G03F7/032C08G18/48C08G18/72C08K5/0025C08K5/005C08L75/04G03H1/02
Inventor M·-S·韦泽T·罗尔F·-K·布鲁德T·法克D·霍内尔
Owner COVESTRO DEUTSCHLAND AG