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Composition for laser marking

A technology of laser marking and composition, which is applied in the direction of copying/marking method, temperature recording method, application of radioactive source radiation, etc., and can solve problems such as dark background color distortion

Inactive Publication Date: 2002-10-30
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this level, the dye or pigment distorts the dark background color in order to obtain a colored mark

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0047] Example 2, illustrating the invention, comprising copper chromite having a spinel structure, without dyes or pigments used as marking agents. This embodiment has a black background color and good contrast between the white laser marks and the black background with no discoloration.

[0048] In a hand mixer, by blending polycarbonate resin (PC-125, molecular weight of about 23,300) as shown in Table 2, 1 wt% methyl methacrylate butadiene styrene copolymer, 0.5 wt% stearin Acid pentaerythritol ester, 0.1 wt% of I168 (stabilizer from Ciba Geigy), 0.05 wt% of Irganox 1076 (antioxidant from CIBA), and extrude the sample in a Werner & Pfleiderer extruder at a temperature of 270 °C , while preparing Reference Examples D-O and Examples 3-6. The extrudate was cooled by a water bath before pelletizing. The test samples were injection molded in a Demag injection molding machine set at 290°C. The resin was dried at 120°C for two hours in a forced air circulation oven prior to in...

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PUM

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Abstract

A resin composition having laser marking properties comprising a polycarbonate resin, an effective amount of a copper chromite having a spinel structure and up to 0.05% by weight of the total composition of carbon black, wherein said polycarbonate resin foams in laser struck areas to form light colored markings in the laser struck areas on a dark background.

Description

field of invention [0001] The present invention relates to a resin composition suitable for marking with a laser and a method for laser marking. Background of the invention [0002] Laser beams provide an economical and fast method of writing, bar coding and decorative marking on plastics. The advantage of this technique over common printing techniques is that the layout can be adjusted and integrated into the production line using a graphical computer program. The laser marking method is a process of placing characters such as letters, figures and symbols, bar codes or images on a surface by irradiating a target surface with laser light using a laser. Laser marking is a contactless procedure; thus it is possible to mark even on soft, irregular surfaces that are not easily accessible. Laser marking is ink-free, which provides long-lasting application, and it is solvent-free, making it more environmentally friendly. [0003] Several laser types are available for marking pl...

Claims

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Application Information

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IPC IPC(8): B41M5/26C08K3/04C08K3/24C08K5/00C08L69/00
CPCB41M5/267C08K3/04C08K3/24Y10S430/146Y10S430/142C08L69/00B41M5/26
Inventor A·拉姆洛T·J·利利T·L·赫克斯
Owner SABIC GLOBAL TECH BV