JP2011032452A - Resin composition for white-laser-marking - Google Patents

Resin composition for white-laser-marking Download PDF

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JP2011032452A
JP2011032452A JP2009213604A JP2009213604A JP2011032452A JP 2011032452 A JP2011032452 A JP 2011032452A JP 2009213604 A JP2009213604 A JP 2009213604A JP 2009213604 A JP2009213604 A JP 2009213604A JP 2011032452 A JP2011032452 A JP 2011032452A
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resin
sodium
potassium
black
resin composition
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JP5156709B2 (en
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Jae Yong Hyun
在 鎔 玄
Do Hoon Lee
度 勳 李
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Hanwha Total Petrochemicals Co Ltd
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Samsung Total Petrochemicals Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/10—Metal compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition which can provide white marking with excellent whiteness on the surface of plastic molded products by laser irradiation and can provide vivid white marking by the use of various kinds of laser equipment. <P>SOLUTION: The invention relates to a resin composition for white-laser-marking which provides excellent vividness and whiteness when white-marking is performed by the use of laser irradiation, and more specifically relates to a resin composition for white-laser-marking, which contains a thermoplastic resin, a thermosetting resin, or a mixed resin thereof, a black pigment and an alkali metal compound. When the surface of a molded product formed of the resin composition is irradiated with laser light to make markings of characters, symbols, drawings, photographs, etc. thereon, white markings with white vivid contrast can be obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明はレーザーの照射による白色マーキングのとき、鮮明度と白色度が優秀な白色レーザーマーキング(ｗhite−laser−marking)用樹脂組成物に関する。   The present invention relates to a white-laser-marking resin composition having excellent sharpness and whiteness when white marking is performed by laser irradiation.

プラスチック成形品にパターン、文字、数字、絵等をマーキングする従来の技術には、パッドプリンテイング(pad printing),含浸プリンテイング(impregnation printing),レーザーマーキング等の方法があるが、最近では環境的、エネルギー的、耐久性、経済性およびデザイン的な点で優秀なレーザーマーキング方法が電気電子製品、特にキーボードのキー印字、自動車の内装材等に多く利用されている。単純にカーボンブラックを添加した樹脂組成物で成形された成形品の黒色質にレーザーマーキングによって白色マーキングをする場合は、レーザーによる白色度や外観が劣って用途が極めて限定され、既存に知られたシリコン系物質や金属類、チタン酸化物、雲母等を配合した樹脂組成物で成形された成形品のマーキングのときには、白色度が十分でないばかりでなく、マーキングが均一でないので、各種の用途に適用するのに制限を有していた。   Conventional techniques for marking patterns, letters, numbers, pictures, etc. on plastic molded products include pad printing, impregnation printing, and laser marking. Laser marking methods that are excellent in terms of energy, durability, economy, and design are widely used for electrical and electronic products, particularly for keyboard key printing and automobile interior materials. When white marking is performed by laser marking on the black color of a molded product formed by simply adding a resin composition containing carbon black, the use is extremely limited due to inferior laser whiteness and appearance. When marking molded products made of resin compositions containing silicon-based materials, metals, titanium oxide, mica, etc., not only is the whiteness not sufficient, but the marking is not uniform, so it can be used for various purposes. I had a limit to doing it.

本発明の目的は、レーザー照射によってプラスチック成形品の表面に白色度が優秀な白色マーキングが可能であり、種々なレーザー装備で鮮明に白色マーキングをすることができる、樹脂組成物を提供することである。   An object of the present invention is to provide a resin composition capable of performing white marking with excellent whiteness on the surface of a plastic molded article by laser irradiation and capable of clearly marking white with various laser equipment. is there.

本発明の白色レーザーマーキング用樹脂組成物は、熱可塑性樹脂または熱硬化性樹脂またはこれらの混合樹脂100重量部に対し、黒色顔料を0.01〜5重量部、およびアルカリ金属化合物を、そのアルカリ金属の重量基準で、0.05〜40重量部を含んでなることを特徴とする。   The resin composition for white laser marking of the present invention comprises 0.01 to 5 parts by weight of a black pigment and 100 parts by weight of an alkali metal compound and 100 parts by weight of a thermoplastic resin, a thermosetting resin or a mixed resin thereof. It is characterized by comprising 0.05 to 40 parts by weight on a weight basis.

本発明の樹脂組成物において、上記熱可塑性樹脂としては、ポリエチレン(PE)、ポリプロピレン(PP),ポリエステル、ポリフエニレンスルフイド(sulfide)、ポリカーボネート(PC), 変性ポリフエニルエーテル(mPPE),ポリスチレン、ハイインパクトポリスチレン(HIPS)，アクリロニトリルブタジエンスチレン(ABS)、ポリブチレンテレフタレート(PBT),ポリメタクリル酸メタル樹脂(PMMA)、ポリアセタール、ポリウレタン、不飽和ポリエステル、ポリフエニレンオキサイド、ポリスチレン、アクリル系樹脂、各種エラストマー(天然ゴム、合成ゴム、熱可塑性エラストマーを含む)等を挙げることができ、上記熱硬化性樹脂としては、沃素樹脂、フエノール樹脂、エポキシ樹脂等を挙げることができ、上記樹脂等の混合樹脂および共重合体樹脂も使用することができ、上記言及された樹脂等に限定されるものではない。   In the resin composition of the present invention, as the thermoplastic resin, polyethylene (PE), polypropylene (PP), polyester, polyphenylene sulfide (sulfide), polycarbonate (PC), modified polyphenyl ether (mPPE), polystyrene , High impact polystyrene (HIPS), acrylonitrile butadiene styrene (ABS), polybutylene terephthalate (PBT), polymethacrylic acid metal resin (PMMA), polyacetal, polyurethane, unsaturated polyester, polyphenylene oxide, polystyrene, acrylic resin, Various elastomers (including natural rubber, synthetic rubber, and thermoplastic elastomer) can be exemplified, and examples of the thermosetting resin include iodine resin, phenol resin, epoxy resin, and the like. Resins and copolymer resins can also be used It is not limited to the above mentioned resin or the like.

本発明の樹脂組成物において、上記黒色顔料としては、カーボンブラック、チタニウムブラック、フアーネスブラック、アセチレンブラック、ランプブラック、アニリンブラック、スルフアブラック等の黒色顔料を1種或いは2種以上混合して使用することができ、特に、炭素粒子からなる顔料、例えば、カーボンブラックが最も好ましい。上記黒色顔料の好ましき平均粒径は10〜100nmであり、されに好ましくは30〜70nmである。上記黒色顔料の平均粒径が上記範囲を外れる場合には、レーザーマーキングの時、白色度が劣るので好ましくない。上記黒色顔料の含量は、上記樹脂100重量部に対し、0.01〜5重量部が好ましく、さらに好ましくは0.01〜２重量部である。黒色顔料の含量が5重量部を超えると、レーザ照射のとき、遮蔽効果により表面から深く照射されないので白色度が劣り、0.01重量部未満であれば、コントラストが弱くなって、鮮明度が劣り得るので好ましくない。   In the resin composition of the present invention, as the black pigment, black pigments such as carbon black, titanium black, furnace black, acetylene black, lamp black, aniline black, sulfur black, etc. may be used alone or in combination. In particular, pigments made of carbon particles, such as carbon black, are most preferred. The preferred average particle size of the black pigment is 10 to 100 nm, and preferably 30 to 70 nm. When the average particle diameter of the black pigment is out of the above range, the whiteness is inferior at the time of laser marking, which is not preferable. The content of the black pigment is preferably 0.01 to 5 parts by weight, more preferably 0.01 to 2 parts by weight with respect to 100 parts by weight of the resin. When the content of the black pigment exceeds 5 parts by weight, the whiteness is inferior because it is not irradiated deeply from the surface due to the shielding effect at the time of laser irradiation, and if it is less than 0.01 parts by weight, the contrast becomes weak and the sharpness may be inferior. Therefore, it is not preferable.

本発明の樹脂組成物において、上記アルカリ金属化合物は、白色度発現に触媒作用をするものであって、上記アルカリ金属化合物はレーザー照射のとき、黒色顔料の分解を促進させ蒸発を誘発し、同時に黒色顔料が吸収したエネルギーを効果的に熱に発散させ、樹脂の溶融および発泡特性を向上させることにより、白色度と鮮明度を向上させる。   In the resin composition of the present invention, the alkali metal compound catalyzes the expression of whiteness, and the alkali metal compound promotes the decomposition of the black pigment and induces evaporation at the time of laser irradiation. The energy absorbed by the black pigment is effectively dissipated into heat, and the melting and foaming characteristics of the resin are improved, thereby improving whiteness and sharpness.

上記アルカリ金属化合物のアルカリ金属成分としては、リチウム、ベリリウム、ナトリウム、マグネシウム、カリウム、カルシウム、バリウム等を挙げることができ、上記アルカリ金属化合物の好ましきな具体的な例としては、水酸化カリウム、塩化カリウム、炭酸カリウム、燐酸カリウム、ヨードカリウム、硝酸カリウム、アセト酸カリウム、マンガン酸カリウム、カリウムシリケート、ステアリン酸カリウム、塩化ナトリウム、水酸化ナトリウム、硝酸ナトリウム、炭酸ナトリウム、ステアリン酸ナトリウム、、アセト酸ナトリウム、硫化ナトリウム、珪酸ナトリウム、トルエンスルホン酸ナトリウム、オレイン酸ナトリウム、炭酸カルシウム、ステアリン酸カルシウム、水酸化バリウム等を1種または2種以上混合して使用することができる。上記アルカリ金属化合物の含量は、上記アルカリ金属化合物のアルカリ金属の重量を基準で、上記樹脂100重量部に対し、0.05〜40重量部であり、好ましくは0.1〜20重量部である。上記アルカリ金属化合物の含量が、アルカリ金属の重量基準で、0.05重量部未満であれば、マーキング性が劣り白色度が低下され好ましくなく、40重量部を超えるとマーキング性は高くなるが、炭化され白色度が低下され好ましくない。   Examples of the alkali metal component of the alkali metal compound include lithium, beryllium, sodium, magnesium, potassium, calcium, and barium. Preferred specific examples of the alkali metal compound include potassium hydroxide. , Potassium chloride, potassium carbonate, potassium phosphate, iodopotassium, potassium nitrate, potassium acetoate, potassium manganate, potassium silicate, potassium stearate, sodium hydroxide, sodium hydroxide, sodium nitrate, sodium carbonate, sodium stearate, aceto acid Sodium, sodium sulfide, sodium silicate, sodium toluenesulfonate, sodium oleate, calcium carbonate, calcium stearate, barium hydroxide, etc. can be used alone or in combination. That. The content of the alkali metal compound is 0.05 to 40 parts by weight, preferably 0.1 to 20 parts by weight, based on 100 parts by weight of the resin, based on the weight of the alkali metal of the alkali metal compound. If the content of the alkali metal compound is less than 0.05 parts by weight based on the weight of the alkali metal, the marking property is inferior and the whiteness is lowered, and if it exceeds 40 parts by weight, the marking property increases, but carbonization occurs. The whiteness is lowered, which is not preferable.

本発明の樹脂組成物には、材料の物性を向上させるための通常の種々な添加剤等、例えば、樹脂安定剤、核剤、可塑剤、難燃剤、スリップ剤、抗菌剤、フイラー(シリカ、タルク、ガラス繊維、雲母、珪石灰、炭酸カルシウム、硫化バリウム等)などが単独または混合して含まれ得る。このような添加剤等の添加によってレーザーマーキング後、耐久性、耐摩耗性などの特性を向上させることができる。   In the resin composition of the present invention, various usual additives for improving the physical properties of the material, such as resin stabilizer, nucleating agent, plasticizer, flame retardant, slip agent, antibacterial agent, filler (silica, Talc, glass fiber, mica, silica lime, calcium carbonate, barium sulfide, etc.) may be included alone or in combination. By adding such an additive, it is possible to improve characteristics such as durability and wear resistance after laser marking.

本発明の樹脂組成物は、種々なミキサー、例えば、ヘンシエルミキサー、バンバリーミキサー、ニーダ、押出し機、ボールミキサー、連続フエラールミキサー, 擂り鉢等を利用して各成分を混練した後、押出す方法で製造することができる。上記混練方法は、黒色顔料とアルカリ金属化合物の分散性を増大させることができるものであれば特別に制限がなく、例えば、樹脂と黒色顔料にアルカリ金属化合物を添加する方法、黒色顔料とアルカリ金属化合物を共に十分にグラインデイングした後、樹脂と混練する方法、または種々な溶媒を使用してアルカリ金属化合物と黒色顔料の混練性を増大させる方法等種々な混練方法が利用され得る。   The resin composition of the present invention is prepared by kneading each component using various mixers such as a Hensiel mixer, a Banbury mixer, a kneader, an extruder, a ball mixer, a continuous fryer mixer, a mortar and the like, and then extruding. It can be manufactured by the method. The kneading method is not particularly limited as long as the dispersibility of the black pigment and the alkali metal compound can be increased. For example, a method of adding an alkali metal compound to a resin and a black pigment, a black pigment and an alkali metal Various kneading methods such as a method of kneading the compound together sufficiently and then kneading with the resin or a method of increasing the kneadability of the alkali metal compound and the black pigment using various solvents can be used.

本発明の樹脂組成物の製造時に、黒色顔料と上記アルカリ金属化合物の分散を向上させるために、混練過程で分散剤を添加することが好ましいが、上記分散剤の種類は特別に限定されないが、脂肪酸系化合物が好ましく利用され得る。上記脂肪酸系化合物としては、炭素数2〜32の飽和または不飽和脂肪酸またはその誘導体(塩、エステル、アミド等)を挙げることができ、好ましくはラウリン酸、ミリスチン酸、パルミチン酸、ステアリン酸、オレイン酸、リノール酸、リノレン酸等の高級脂肪酸と、ラウリン酸亜鉛、ステアリン酸カルシウム、ステアリン酸亜鉛、オレイン酸ナトリウム等の高級脂肪酸塩、エチレンビスステアリルアミド、ラウリン酸アミド等の高級脂肪酸アミドを例示することができる。このような分散剤を添加するときには、レーザーマーキングのとき、白色度の増加のために、上記樹脂組成物100重量部に対し0.002〜10重量部、特に0.01〜5重量部を添加するのが好ましい。   In the production of the resin composition of the present invention, in order to improve the dispersion of the black pigment and the alkali metal compound, it is preferable to add a dispersant in the kneading process, but the type of the dispersant is not particularly limited, Fatty acid compounds can be preferably used. Examples of the fatty acid compounds include saturated or unsaturated fatty acids having 2 to 32 carbon atoms or derivatives thereof (salt, ester, amide, etc.), preferably lauric acid, myristic acid, palmitic acid, stearic acid, olein Illustrate higher fatty acids such as acid, linoleic acid and linolenic acid, higher fatty acid salts such as zinc laurate, calcium stearate, zinc stearate and sodium oleate, and higher fatty acid amides such as ethylenebisstearylamide and lauric acid amide. Can do. When such a dispersant is added, it is preferable to add 0.002 to 10 parts by weight, particularly 0.01 to 5 parts by weight with respect to 100 parts by weight of the resin composition in order to increase whiteness during laser marking. .

本発明の樹脂組成物を利用して成形物を製造する場合、成形方法には特別に制限がなく、例えば、射出成形やブロー成形、回転成形のような公知の成形方法で成形することができる。   When a molded product is produced using the resin composition of the present invention, the molding method is not particularly limited, and can be molded by a known molding method such as injection molding, blow molding, or rotational molding. .

本発明の樹脂組成物で成形された成形品のマーキング時に使用されるレーザー光線の種類は特別に限定されず、ガスレーザー、半導体レーザー、エキシマ・レーザー等がすべて使用し得るし、カーボンブラックが吸収できる波長帯を有するNd:YAGレーザー,Nd:YVO4レーザーが最も好ましく利用され得る。上記レーザーは、ランプタイプ、ダイオードタイプ、フアイバータイプ等がすべて利用され得るし、ダイオードタイプとフアイバータイプのレーザーがランプタイプ対比優秀な白色度が発現されるのでさらに好ましい。   The type of laser beam used when marking a molded product molded with the resin composition of the present invention is not particularly limited, and gas lasers, semiconductor lasers, excimer lasers, etc. can all be used, and carbon black can be absorbed. Nd: YAG laser and Nd: YVO4 laser having a wavelength band can be most preferably used. As the laser, all of a lamp type, a diode type, a fiber type, and the like can be used, and a diode type and a fiber type laser are more preferable because they exhibit whiteness superior to the lamp type.

本発明の樹脂組成物によれば、白色レーザーマーキング時、成形体の表面に白色度および鮮明度が優秀な白色マーキングが可能な効果を得ることができる。   According to the resin composition of the present invention, at the time of white laser marking, it is possible to obtain an effect capable of white marking with excellent whiteness and sharpness on the surface of the molded body.

本発明は下記の実施例によってより具体的に理解できるし、下記の実施例は本発明を例示するためのものであって、本発明の保護範囲を制限しようとするものではない。   The present invention can be more specifically understood by the following examples, which are intended to illustrate the present invention and are not intended to limit the protection scope of the present invention.

（実施例および比較例）
下記表１に示した組成のとおり、各成分を配合して、樹脂組成物を製造した。製造された樹脂組成物を二軸押出し機を利用して210℃で押出した後、射出成形して、100mm×100mm×２mmの平たなシートを製造した。シートの表面にNd/YAGレーザー(Falcon社)を利用して、レーザーマーキングを40mm×40mm正四角形形状にマーキングをした後、カラー測定機でマーキングされた部分の白色度(WI)と明度(L)を測定して、5等級に判定した。ここで、1等級はマーキングの鮮明度と白色度が最も優秀な場合、5等級はマーキングの鮮明度と白色度が最も低い場合である。マーキング等級判定の結果を下記表１に共に示した。 (Examples and Comparative Examples)
As shown in the following Table 1, each component was blended to produce a resin composition. The produced resin composition was extruded at 210 ° C. using a twin screw extruder and then injection molded to produce a flat sheet of 100 mm × 100 mm × 2 mm. Using a Nd / YAG laser (Falcon) on the surface of the sheet, after marking the laser marking into a 40mm x 40mm regular square shape, the whiteness (WI) and lightness (L ) Was measured and judged to be 5 grades. Here, the first grade is the case where the sharpness and whiteness of the marking are the best, and the fifth grade is the case where the sharpness and whiteness of the marking are the lowest. The results of marking grade determination are shown in Table 1 below.

Figure 2011032452

Figure 2011032452
上記表１〜３に示したとおり、本発明の実施例の樹脂組成物で製造した成形物のレーザーマーキング等級が比較例に比べて顕著に優秀であることが分かる。
Figure 2011032452
Figure 2011032452
As shown in Tables 1 to 3 above, it can be seen that the laser marking grades of the molded products produced with the resin compositions of the examples of the present invention are remarkably superior to those of the comparative examples.

Claims (5)

熱可塑性樹脂または熱硬化性樹脂またはこれらの混合樹脂100重量部に対し、黒色顔料を0.01〜5重量部、およびアルカリ金属化合物を、そのアルカリ金属の重量を基準で、0.05〜40重量部を含むことを特徴とするレーザーマーキング用樹脂組成物。   Including 100 to 5 parts by weight of a thermoplastic resin, a thermosetting resin or a mixed resin thereof, 0.01 to 5 parts by weight of a black pigment and 0.05 to 40 parts by weight of an alkali metal compound based on the weight of the alkali metal A resin composition for laser marking characterized by the above. 上記熱可塑性樹脂は、ポリエチレン、ポリプロピレン,ポリエステル、ポリフエニレンスルフイド、ポリカーボネート,変性ポリフエニルエーテル,ポリスチレン、ハイインパクトポリスチレン，アクリロニトリルブタジエンスチレン、ポリブチレンテレフタレート,ポリメタクリル酸メタル樹脂、ポリアセタール、ポリウレタン、不飽和ポリエステル、ポリフエニレンオキサイド、ポリスチレン、アクリル系樹脂およびエラストマーから選ばれ、上記熱硬化性樹脂は、沃素樹脂、フエノール樹脂およびエポキシ樹脂から選ばれることを特徴とする請求項１に記載のレーザーマーキング用樹脂組成物。   The above thermoplastic resins are polyethylene, polypropylene, polyester, polyphenylene sulfide, polycarbonate, modified polyphenyl ether, polystyrene, high impact polystyrene, acrylonitrile butadiene styrene, polybutylene terephthalate, polymethacrylate metal resin, polyacetal, polyurethane, non-polyethylene. 2. The laser marking according to claim 1, wherein the laser marking is selected from saturated polyester, polyphenylene oxide, polystyrene, acrylic resin and elastomer, and the thermosetting resin is selected from iodine resin, phenol resin and epoxy resin. Resin composition. 上記黒色顔料は、カーボンブラック、チタニウムブラック、フアーネスブラック、アセチレンブラック、ランプブラック、アニリンブラックおよびスルフアブラックから選ばれる1種以上であることを特徴とする請求項１に記載のレーザーマーキング用樹脂組成物。   2. The laser marking resin according to claim 1, wherein the black pigment is at least one selected from carbon black, titanium black, furnace black, acetylene black, lamp black, aniline black, and sulfur black. Composition. 上記アルカリ金属化合物は、リチウム、ベリリウム、ナトリウム、マグネシウム、カリウム、カルシウムまたはバリウムの塩であることを特徴とする請求項１に記載のレーザーマーキング用樹脂組成物。   The resin composition for laser marking according to claim 1, wherein the alkali metal compound is a salt of lithium, beryllium, sodium, magnesium, potassium, calcium, or barium. 上記ナトリウム化合物は、塩化ナトリウム、水酸化ナトリウム、硝酸ナトリウム、炭酸ナトリウム、ステアリン酸ナトリウム、アセト酸ナトリウム、硫化ナトリウム、珪酸ナトリウム、トルエンスルホン酸ナトリウムおよびオレイン酸ナトリウムから選ばれ、上記カリウム化合物は、水酸化カリウム、塩化カリウム、炭酸カリウム、燐酸カリウム、ヨードカリウム、硝酸カリウム、アセト酸カリウム、マンガン酸カリウム、カリウムシリケートおよびステアリン酸カリウムから選ばれ、上記カルシウム化合物は、炭酸カルシウムおよびステアリン酸カルシウムから選ばれ、上記バリウム化合物は、水酸化バリウムであることを特徴とする請求項４に記載のレーザーマーキング用樹脂組成物。   The sodium compound is selected from sodium chloride, sodium hydroxide, sodium nitrate, sodium carbonate, sodium stearate, sodium acetoate, sodium sulfide, sodium silicate, sodium toluenesulfonate and sodium oleate, and the potassium compound is water. Selected from potassium oxide, potassium chloride, potassium carbonate, potassium phosphate, iodopotassium, potassium nitrate, potassium acetoate, potassium manganate, potassium silicate and potassium stearate, and the calcium compound is selected from calcium carbonate and calcium stearate, The resin composition for laser marking according to claim 4, wherein the barium compound is barium hydroxide.
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