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Thermoplastic resin composition for laser mark

A technology of thermoplastic resin and laser marking, which is applied in coatings, polyester coatings, etc., and can solve the problems of surface damage and difficulty in identifying white characters

Inactive Publication Date: 2003-11-26
TECHNO POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thermoplastic resin material for laser marking of white characters proposed in Japanese Unexamined Publication No. 2001-139758 has the following problems: after using laser marking to form characters on the keys of a keyboard, the white characters will disappear as the frequency of use of key strokes increases. The surface of the text forming part is damaged and difficult to read

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0139] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples listed below unless the gist thereof is exceeded. In addition, in the following Examples and comparative examples, "parts" and "%" mean "parts by weight" and "% by weight" unless otherwise specified. In addition, the evaluation methods used in the following Examples and Comparative Examples are as follows.

[0140] (1) Average particle size of rubbery polymer

[0141] The particle size of the dispersed particles in the emulsion was determined by the light scattering method. The measuring instrument was LPA-3100 manufactured by Otsuka Electronics Co., Ltd., and the cumulant method of accumulating 70 times was used. In addition, it has been confirmed that the particle size of the dispersed rubbery polymer particles in the resin still means the particle size of the rubbery polymer particles in the emulsion synthesized in...

manufacture example 1

[0190] Polybutylene terephthalate manufactured by Mitsubishi Engineering Plastics Co., Ltd. (trade name "Novadelan 5007" melting point: 220° C.) was used. Production example 1 (manufacture of copolymer resin (A11)):

[0191] 100 parts of ion-exchanged water, 1.5 parts of sodium dodecylbenzenesulfonate, 0.1 part of t-dodecyl mercaptan, 15 parts of polybutadiene having an average particle diameter of 280 nm as a rubbery polymer (converted to solids) Content), 5 parts of styrene, 5 parts of acrylonitrile, and 10 parts of methyl methacrylate were added to a glass flask with an internal volume of 7 liters equipped with a stirrer, and the temperature was raised while stirring. When the temperature reaches 45°C, add an active agent aqueous solution consisting of 0.1 part of sodium edetate, 0.003 part of ferrous sulfate, 0.2 part of sodium formaldehyde sulfoxylate dihydrate, and 15 parts of ion-exchanged water, and dicumyl 0.1 part of hydroperoxide, and the reaction was continued for...

manufacture example 2

[0192] Then, 50 parts of ion-exchanged water, 1 part of sodium dodecylbenzenesulfonate, 0.1 part of t-dodecyl mercaptan, 0.2 parts of diisopropylbenzene hydroperoxide, 10 parts of styrene, and acrylonitrile The incremental polymerization component consisting of 5 parts and 50 parts of methyl methacrylate was continuously added for 3 hours to continue the polymerization reaction. After the addition was completed, stirring was continued for 1 hour, and then 0.2 parts of 2,2-methylene-bis-(4-ethylene-6-t-butylphenol) was added, and the reaction product was taken out from the flask. The emulsion of the reaction product was coagulated with 2 parts of calcium chloride, the reaction product was washed well with water, and dried at 75°C for 24 hours to obtain a white powder of the copolymer resin (A1-①). The composition of the obtained resin was butadiene rubber / styrene / acrylonitrile / methyl methacrylate=15 / 15 / 10 / 60 (%). The polymerization conversion rate is 97%, the grafting rate is ...

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PUM

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Abstract

The present invention relates to a laser-marking thermoplastic resin composition, comprising: [A] a rubber-reinforced thermoplastic resin comprising a copolymer resin (A1) obtained by polymerizing a vinyl-based monomer (b) containing a (meth)acrylic acid ester in the presence of a rubber polymer (a), or a mixture of the copolymer resin (A1) and a (co)polymer (A2) of vinyl-based monomer(s), said rubber polymer (a), (meth)acrylic acid ester units (b1) and monomer units (b2) other than the (meth)acrylic ester units (b1) being contained in amounts of 5 to 40% by weight, 25 to 60% by weight and 0 to 70% by weight, respectively, with the proviso that a total content of the components (a), (b1) and (b2) is 100% by weight; [B] at least one material selected from the group consisting of an epoxy-containing polymer (B-1) and particles (B-2) having an average particle diameter of 0.05 to 150 mum, the component [B] being excluded from the component (A2); and [C] a black substance. The distinct mark is formed on the surface of the molding body through the laser irradiation.

Description

technical field [0001] The present invention relates to a thermoplastic resin composition for laser marking. Specifically, the present invention relates to a thermoplastic resin composition for laser marking that can express a clear mark on the surface of a molded article by laser irradiation, and provide a molded article that is excellent in appearance, impact resistance, and laser marking durability. Background technique [0002] At present, if a laser is irradiated on a molded article formed by blending a black-based compound with a thermoplastic resin, the irradiated part will be discolored to black or white. This technique is widely known (Japanese Patent Publication No. Table Ping No. 10-501014, etc.). Such a laser marking technology is used for typing keys on a keyboard, printing characters on a FAX display panel, and the like, and is less expensive and superior in durability and legibility of characters compared to conventional roll printing. [0003] However, the ...

Claims

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Application Information

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IPC IPC(8): C08L51/04C08L63/00
CPCC08L51/04C08L63/00C08L2666/14C08L51/00
Inventor 川上和美住本典史马渡政明
Owner TECHNO POLYMER CO LTD
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