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Vapour deposition of organic UV absorbers onto plastic substrates

A technology for plastic substrates and absorbents, applied in organic chemistry, thin material processing, devices for coating liquids on surfaces, etc., and can solve problems such as UV absorbent splitting

Inactive Publication Date: 2015-06-24
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Said discoloration may have occurred, for example, because the selected process parameters in WO / 1999 / 055471 A1 lead to splitting of the UV absorber

Method used

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  • Vapour deposition of organic UV absorbers onto plastic substrates
  • Vapour deposition of organic UV absorbers onto plastic substrates
  • Vapour deposition of organic UV absorbers onto plastic substrates

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0091] The preparation of aromatic polycarbonates is carried out, for example, by optionally using chain terminators such as monophenols and optionally trifunctional or more than trifunctional branching agents such as triphenols or tetraphenols, such that The diphenols are reacted with carbonyl halides (preferably phosgene) and / or with aromatic dicarbonyl halides (preferably benzenedicarbonyl halides) by interfacial methods. It can also be prepared by reacting a diphenol with, for example, diphenyl carbonate via a melt polymerization method.

[0092] Diphenols for the preparation of aromatic polycarbonates and / or aromatic polyester carbonates are preferably compounds of the formula (I)

[0093]

[0094] in,

[0095] A means single bond, C 1 - to C 5 -Alkylene, C 2 - to C 5 -Alk-1-ylidene (C 2 -to C 5 -alkylidene), C 5 - to C 6 -Cycloalkane-1-ylidene (C 5 -to C 6 -cycloalkylidene), -O-, -SO-, -CO-, -S-, -SO 2 -, C 6 - to C 12 -Arylene, C 6 - to C 12 - further...

Embodiment 1

[0134] Embodiment 1: the preparation of sheet

[0135] For coating tests, use M2808 (linear bisphenol A polycarbonate, available from Bayer AG, Leverkusen, with a melt flow index (MFR) of 10 g / 10 min according to ISO 1133 at 300° C. and a load of 1.2 kg) prepared in optical grade with dimensions 150×10 Injection molded rectangular sheet x 3.2mm with side gate. The melting temperature was 300 to 330°C and the mold temperature was 100°C. The granules were dried in a vacuum drying phase at 120° C. for 5 hours before processing.

[0136] The following process parameters are applicable to Examples 2 to 5 and Comparative Examples 1 to 3.

[0137] Plastic Substrate Polycarbonate Sheet of Example 1

[0138] The shortest distance from the steam source to the substrate 8cm to 10cm

[0139] The shortest distance from the plasma source to the substrate is 30cm

[0140] Angle of vapor source to substrate 45°

[0141] Plasma source to substrate angle 45°

[0142] Plasma source Mu...

Embodiment 2

[0175] Introduce the polycarbonate sheet into the vacuum chamber and evacuate the vacuum chamber to a base pressure of p-8 bar. As described in Comparative Example 1, the boat was filled with R796 (BASF) and melt the UV absorber before switching operation to the backing vacuum unit. During the switching phase, the heating current was maintained at about 50A so that the UV absorber did not cool. Then with the help of Ar gas, the pressure was adjusted to p=7×10 -5 bar, and then ignite the plasma. The power is 2000W pulse (t on :t off =5ms:5ms) and the UV absorber is vapor-deposited simultaneously with the plasma. To do this, adjust the heating current (typically 90A) so that an uncalibrated rate monitor shows approximately constant rate.

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PUM

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Abstract

Method for coating a plastic substrate with a functional layer in which (a) an organic UV absorber, which contains at least one chromophore and at least one reactive side chain, is vaporized in a vacuum chamber and (b) is brought into contact with at least one surface of the plastic substrate and excited by a plasma, or (c) is excited by a plasma and then brought into contact with at least one surface of the plastic substrate, whereby a functional layer containing the UV absorber is formed on the surface of the plastic substrate, wherein the plasma is ignited at a pressure greater than 10-5 bar and less than 1.013 bar.

Description

technical field [0001] The invention relates to a method for coating a plastic substrate with a functional layer comprising an organic UV absorber by plasma-induced vapor deposition, and to a device for carrying out the method. The invention also relates to the plastic substrate produced by said method and its use. Background technique [0002] Plastic moldings are increasingly used for the production of housings for electronic devices, door and window profiles, diffuser headlights, body elements, machine covers, windows and architectural glazing. In terms of manufacture, plastic moldings can be extruded or prepared using low-cost injection molding. Furthermore, complex shapes can be produced from plastic materials with great design freedom. [0003] In order to be able to use plastic moldings in various ways, it is necessary to improve relatively soft and insufficiently chemically resistant plastic surfaces so as to make them, for example, scratch- and abrasion-resistant,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/14B05D3/04
CPCB05D3/0493B05D3/144B05D3/147B05D1/62B05D2201/00Y10T428/31507C07D249/18B05D7/02
Inventor T·库尔曼R·奥泽
Owner BAYER MATERIALSCIENCE AG