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Laser additive

A particle, white particle technology, applied in the direction of fibrous filler, coating, dyed low molecular organic compound treatment, etc., can solve the problems of laser marking contrast reduction, marking wear, elevation and so on

Inactive Publication Date: 2012-10-17
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the aforementioned laser markings have the disadvantage that foam formation within the marking usually leads to a raised surface and additionally necessarily a certain porosity
This pressure compresses the porous foam, especially if it rises above the rest of the unmarked keypad surface, which results in a significant reduction in the contrast of the laser markings and at the same time intense wear of the markings on the keypad surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 50g in 50g of water will have D 90 =22 μm particle size kaolin (measured under standard conditions using a Malvern Instruments Ltd. Mastersizer 2000) to make a paste. 25 g of melamine formaldehyde resin (Madurit MW 830, Ineos, 75% solution) and 1 g of carbon black (Colour Black FW1, Evonik) were stirred into the kaolin suspension. 50 g of 0.3% methylcellulose (Tylose) solution (Tylose H20 from SE Tylose GmbH & Co. KG company) was added and the batch was dispersed in a ball mill (ball mill assembly for "Dispermat" dissolver from Getzmann company ). The resulting dispersed batch was then heated to 70° C. and adjusted to pH 3.5 with stirring using about 26 ml of 1 molar hydrochloric acid. After 30 min reaction time, the batch was allowed to cool. The batch was subsequently filtered through a suction filter and dried overnight at 200°C. The material obtained in this way was ground and sieved (sieve with a mesh width of 40 μm). Obtain a particle size D having a particle...

Embodiment 2

[0080] Will 50g have D 90 = 22μm particle size kaolin (product of Merck KGaA company) (using Malvern Instruments Ltd.'s Mastersizer 2000 to measure under standard conditions) and 25g urea-formaldehyde resin (Kaurit liquid, 50%, product of BASF company), 4g water-based carbon black Dispersion (Evonik’s N25 / L, carbon black content 25%) and 50g 0.3% methylcellulose solution (0.15g Tylose H20, product of SE Tylose GmbH & Co., dissolved in 49.85g water at 60°C) were dispersed in a dissolver. The prepared dispersed batch was then heated to 70° C. and adjusted to a pH of 3-4 by adding 10% oxalic acid with stirring. After 60 min reaction time, the batch was allowed to cool. The batch was rinsed with deionized water, then filtered through a suction filter and dried overnight at 180°C. The material thus obtained was ground and sieved (sieve with a mesh width of 40 μm). Obtain a particle size D having a particle size D measured under standard conditions using a Mastersizer 2000 from...

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Abstract

The invention relates to a laser additive in the form of particles comprising a white core and a casing that contains elemental carbon, to a method for the production thereof, and to the use of such a laser additive in organic polymers, in particular in plastics, paints, automobile paints, powder coatings, printing inks, paper coatings, and paper pulps to produce permanent light laser markings on a preferably dark base.

Description

field of invention [0001] The present invention relates to a laser additive in the form of particles comprising a core of white particles and a shell comprising elemental carbon, a process for its preparation, and the use of said laser additive for laser marking of black, gray or colored organic polymers, in particular plastics, coatings, Applications for automotive paints, powder coatings, printing inks, paper coatings and paper raw materials (Papiermassen). Background technique [0002] Marking of commercial products by means of laser radiation is now a popular technique in almost all industrial sectors. Thus for example production data, batch numbers, expiration dates, barcodes, company logos, serial numbers etc. usually have to be applied to the plastic or the plastic film. [0003] The contrast required for marking is preferably produced by: [0004] 1. Removal of different dyed layers [0005] The downside is that this is a very complex method and can only be used ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C1/30C09C1/42C09C3/08C09C3/10C09D7/62
CPCC09D7/1225C09C3/10C09C1/027C08K3/30C08K9/02C09D7/1266C09C3/08C01P2004/61C09D7/1275C08K3/36C09C1/3072C08K3/22C09C1/309C08K3/34C09D5/26C09C1/02C09C1/42C09C1/3063C01P2004/62C09C1/3027C09D7/62C09D7/67C09D7/68
Inventor G·艾德勒H·B·克尼斯K·伯恩哈特
Owner MERCK PATENT GMBH
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