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Resin composition with laser marking performace, moulding product thereof and marking method

A resin composition, laser marking technology, applied in the directions of reproduction/marking method, thermography method, application of radiation from radioactive sources, etc.

Inactive Publication Date: 2005-04-27
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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  • Resin composition with laser marking performace, moulding product thereof and marking method
  • Resin composition with laser marking performace, moulding product thereof and marking method
  • Resin composition with laser marking performace, moulding product thereof and marking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] In a hand mixer, by blending polycarbonate resin (PC-125, molecular weight about 23,300) as shown in Table 1, 1.1 wt% methyl methacrylate butadiene styrene copolymer, 0.5 wt% hard Pentaerythritol fatty acid ester, 0.1wt% of I168 (stabilizer of Ciba Geigy), 0.05wt% of Irganox 1076 (antioxidant of CIBA) and the colorant shown in Table 1, and at a temperature of 270 ° C, in Reference Examples A, B and C and Examples 1 and 2 were prepared by extruding samples in a Werner & Pfleiderer extruder. 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 injection molding. Each sample was molded into a test panel with a diameter of 10 cm. Using the settings shown in Table 1, the samples were irradiated with a Nd:YAG laser. The pattern used to test the laser marking was the "GEPlastics" logo of diffe...

Embodiment 2

[0054] 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.

[0055]In a hand mixer, by blending polycarbonate resin (PC-125, about 23,300 parts by weight) as shown in Table 2, 1 wt% methyl methacrylate butadiene styrene copolymer, 0.5 wt% Pentaerythritol stearate, 0.1 wt% of I168 (stabilizer from Ciba Geigy), 0.05 wt% of Irganox 1076 (antioxidant from CIBA), and extruded in a Werner & Pfleiderer extruder at a temperature of 270°C Out sample, and preparation reference example D-0 and embodiment 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 injection molding...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/26C08K3/04C08K3/24C08K5/00C08L69/00
CPCY10S430/142C08K3/04C08K3/24Y10S430/146B41M5/267C08L69/00B41M5/26
Inventor A·拉姆洛T·J·利利T·L·赫克斯
Owner SABIC GLOBAL TECH BV
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