A color laser marking composition, and a method of preparing and using the same

Abstract

The application discloses a kind of color laser marking composition and its preparation method and application.The color laser marking composition includes the following components calculated by weight parts: resin 88-110 parts;Photosensitive reversible toner 0.1-5 parts;Visible light absorber 0.01-1 parts;Pigment 0.1-2 parts;Ultraviolet absorber 0.05-1 parts.In the application, the color laser marking composition can mark color marks on white and color substrates by adding photosensitive reversible toner and visible light absorber, combined with ultraviolet absorber, has higher definition and color saturation, and marking is controllable.

Description

Technical Field

[0001] This invention relates to the field of laser marking technology, and more specifically, to a color laser marking composition, its preparation method, and its application. Background Technology

[0002] Laser marking of polymers is a novel marking method that uses the high energy of a laser to carbonize the surface of plastic or decompose certain components on the surface to produce gas that causes the plastic to foam, thereby obtaining a mark with a significant color difference from the base color. Compared with screen printing and oil printing, it is more environmentally friendly and lower in cost, and is receiving increasing attention and application.

[0003] Color laser marking of polymers mainly involves chemical modification and physical bonding methods. While physical bonding can achieve color marking, the process is complex, the coloring is uneven, and the marking is not permanent. Chemical modification, on the other hand, builds upon existing marking methods by adding colorants or pigments, resulting in a different color on the sample surface after absorbing laser energy. Existing technology CN116120702A obtains color markings through the decomposition and color change of colorants and black substances (which absorb laser energy). However, this primarily targets marking black substrates and cannot achieve color marking on white or colored substrates. Furthermore, research on marking color on white or colored substrates is currently limited. Therefore, there is a need in this field to develop a color laser marking composition that can be used to mark permanent colors on white or colored substrates. Summary of the Invention

[0004] To overcome the shortcomings or defects of the prior art, the present invention provides a color laser marking composition that can be used to mark permanent color marks on white and colored polymer substrates.

[0005] Another object of the present invention is to provide a method for preparing the color laser marking composition.

[0006] Another object of the present invention is to provide an application of the color laser marking composition.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A color laser marking composition comprising the following components in parts by weight:

[0009]

[0010] This invention provides a color laser marking composition. The composition, by adding photosensitive reversible pigments and visible light absorbers, and combining them with ultraviolet absorbers, enables the marking of color onto white and colored substrates, exhibiting high clarity and color saturation, and the marking is permanent. Specifically, generally, photosensitive reversible pigments change color after absorbing light of a specific wavelength, but revert to their original color under visible light irradiation. By combining this composition with a visible light absorber, the conditions for the photosensitive reversible pigment to revert to its original color are disrupted, resulting in a color change upon absorbing light of a specific wavelength without reverting to its original color. The addition of ultraviolet absorbers to the system allows the resin to better absorb the ultraviolet light emitted by the ultraviolet laser marking machine, making the laser marking range controllable and clear.

[0011] In the color laser marking composition of this invention, the resin content is preferably not less than 90 wt.%.

[0012] Furthermore, the color laser marking composition comprises the following components in parts by weight:

[0013]

[0014] Furthermore, the photosensitive reversible pigment includes one or more of the following: spiropyran compounds, spirozine compounds, azobenzene compounds, diarylethylene compounds, and succinic anhydride compounds.

[0015] Furthermore, the photosensitive reversible pigment is one or more of azobenzene compounds, spirozine compounds, and succinic anhydride compounds.

[0016] Specifically, the spiropyran compounds are one or more of the following: spiro[1,3,3-trimethylindole-(6'-bromobenzodihydropyran)], spiro[1,3,3-trimethylindole-(8'-methoxybenzodihydropyran)], 1,3,3-trimethylindole-6'-nitrobenzodihydropyran-spiroalkyl, spiro[1,3,3-trimethylindole-benzodihydropyran], 1',3'-dihydro-8-methoxy-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-[2H]indole], 1,3,3-trimethylindole-naphthospiroxazine, spiro[1,3,3-trimethylindole-β-benzodihydropyran], or N-hydroxyethyl-3,3-dimethyl-6-nitroindolinespiropyran.

[0017] Specifically, the spirozymes are one or more of the following: 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-[3H]phenanthro[9,10-B](1,4)oxazine], 5-chloro-1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-(3H)naphtho[2,1-B](1,4)azine], 1,3-dihydro-1,3,3-trimethyl-6'-(1-piperidinyl)spiro[2H-indole-2,3′-[3H]naphtho[2,1-B][1,4]oxazine], and 1,3-dihydro-1,3,3-trimethyl-6'-(4-morpholinyl)-spiro[2H-indole-2,3′-[3H]naphtho[2,1-B][1,4]oxazine].

[0018] Specifically, the azobenzene is one or more of 4,4'-bis(decoxy)-3-methylazobenzene, 4-[bis(9,9-dimethylfluoren-2-yl)amino]azobenzene, 4,4'-bis(hexoxy)-3-methylazobenzene, and 4,4'-bis(dodecyloxy)-3-methylazobenzene.

[0019] The diarylethene compounds are one or more of (Z)-3,3'-(1,2-dimethyl-1,2-vinyldiyl)bis[2,5-dimethyl-thiophene, cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thiophene)ethylene, 2,3-bis(2,4,5-trimethyl-3-thiophene)maleic anhydride, 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene or 1,2-bis[2-methylbenzo[b]thiophene-3-yl]-3,3,4,4,5,5-hexafluoro-1-cyclopentene.

[0020] The succinic anhydride compounds are 2-(allyloxymethyl)-18-crown-6-ether and / or (E)-3-(adamantane-2-ethylene)-4-(1-(2,5-dimethylfuran-3-yl)ethylene)dihydrofuran-2,5-dione.

[0021] It should be noted that the hue of pigments is different from the hue of photosensitive reversible pigments after absorbing external ultraviolet light.

[0022] Further, the resin includes one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, polyoxymethylene, polybutylene terephthalate, polyamide, acrylonitrile-butadiene-styrene terpolymer, or polymethyl methacrylate.

[0023] Specifically, the melt flow rate of the polypropylene at 230°C and 2.16 kg is 0.5–100 g / 10 min.

[0024] The acrylonitrile-butadiene-styrene terpolymer has a melt flow rate of 1-70 g / 10 min at 220°C and 10 kg.

[0025] The polymethyl methacrylate has a melt flow rate of 1–50 g / 10 min at 230°C and 3.8 kg.

[0026] The polyoxymethylene melt flow rate at 190°C and 2.16 kg is 1–50 g / 10 min.

[0027] The polystyrene has a melt flow rate of 1–50 g / 10 min at 200 °C and 5 kg.

[0028] Specifically, the test standard for the melt flow rate is GB / T3682.1-2018.

[0029] Furthermore, the ultraviolet absorber includes one or more of benzophenone absorbers, benzotriazole absorbers, or triazine absorbers.

[0030] In some preferred embodiments, the ultraviolet absorber is a benzotriazole ultraviolet absorber and / or a triazine absorber. The resulting color laser marking composition exhibits a more pronounced color difference before and after marking.

[0031] Specifically, the benzophenone absorbent is 2-hydroxy-4-n-octyloxybenzophenone, and the benzotriazole absorbent is 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octyl)phenylbenzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl)benzotriazole. The triazine absorbent is one or more of 2-[2-hydroxy-4-[3-(2-ethylhexyloxy)-2-hydroxypropoxy]phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-octoxyphenol, and 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol.

[0032] Further, the visible light absorber includes Basic Red 12, 1-butyl-2-[5-(1-butyl-1,3-dihydro-3,3-dimethyl-2H-indole-2-ylidene)-penta-1,3-diphenyl]-3,3-dimethyl-3H-indole hexafluorophosphate, and 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indole-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl 3H-indole chloride, 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squamous acid, 3,3'-diethyloxacarbonyl anthocyanin iodide, 3-butyl-2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indole-2-ylidene)-1,3-pentadienyl]-1,1-dimethyl-1H-benzo[E]indole tetrafluoroborate, 4,5:4',5'-bisphenyl-1,1'-dibutyl-3,3 3',3'-Tetramethylindole dicarboxycyanide hexafluorophosphate, 1-butyl-5-[2-(1-butyl-3,3-dimethyl-1,3-dihydroindole-2-yl)ethylidene]-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carboxynitrile, [5-[2-(3-ethyl-3H-benzothiazolyl-2-yl)ethylidene]-4-oxo-2-thiononethiazolyl-3-yl]acetic acid, 2-[3 -(3-butyl-1,3-dihydro-1,1-dimethyl-2H-benzo[E]indole-2-ylidene)-1-propen-1-yl]-1,1,3-trimethyl-1H-benzo[E]indole hexafluorophosphate or 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indole-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indole tetrafluoroborate.

[0033] Furthermore, the visible light absorber is Basic Red and / or 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squamous acid.

[0034] Furthermore, the pigment includes one or more of the following: white, red, yellow, green, blue, or purple pigments.

[0035] Those skilled in the art should understand that white pigments appear white under visible light, red pigments appear red under visible light, yellow pigments appear yellow under visible light, green pigments appear green under visible light, blue pigments appear blue under visible light, and violet pigments appear violet under visible light.

[0036] Specifically, the white pigment may be titanium dioxide and / or zinc sulfide.

[0037] In a specific embodiment, the titanium dioxide has an average particle size of 200-300 nm.

[0038] Specifically, the average particle size is determined by dynamic light scattering, with reference to standard GB / T 29022-2021.

[0039] Specifically, the titanium dioxide has three crystal forms: rutile, anatase, or plate-type.

[0040] Furthermore, the titanium dioxide has a rutile crystal form.

[0041] The red pigment may be methyl 4-cyano-5-[[5-cyano-2,6-di[(3-methoxypropyl)amino]-4-methyl-3-pyridyl]azo]-3-methyl-2-thiophenecarboxylate and / or 5,12-dihydro-2,9-dimethylquinolino[2,3-B]acridin-7,14-dione.

[0042] The yellow pigment may be 2-(3-hydroxy-2-quinolinyl)-1,3-indanedion and / or 3-(5-chloro-2-benzoxazolyl)-7-(diethylamino)-2H-1-benzopyran-2-one.

[0043] The green pigment may be phthalocyanine green and / or 1,4-di-p-tolueneaminoanthraquinone.

[0044] The blue pigment may be phthalocyanine blue and / or 1,4-bis[(2,4,6-trimethylphenyl)amino]-9,10-anthradinone.

[0045] The violet pigment may be solvent violet 37 and / or pigment violet 15.

[0046] Furthermore, the color laser marking composition also includes 0.1 to 2 parts of antioxidant and / or 0.5 to 5 parts of dispersant.

[0047] The antioxidants described in this invention can be selected from commonly used antioxidants with reference to existing technologies, such as, but not limited to, hindered phenolic antioxidants and / or phosphite antioxidants.

[0048] Specifically, the hindered phenolic antioxidant is one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester, or diethylene glycol bis[methyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate].

[0049] Specifically, the phosphite antioxidant is one or more of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,6-di-tert-butyl-4-tolyl) pentaerythritol phosphite, bis(2,4-dicumylphenyl) pentaerythritol-diphosphite, or bis(2,4-di-tert-butylphenyl) pentaerythritol bisdiphosphite.

[0050] The dispersant described in this invention can be a commonly used dispersant selected with reference to the prior art, such as, but not limited to, one or more of zinc stearate, calcium stearate, magnesium stearate, polyethylene wax or oxidized polyethylene wax.

[0051] The present invention also provides a method for preparing the color laser marking composition, comprising the following steps: mixing the components evenly, melt extruding, and granulating to obtain the color laser marking composition.

[0052] Specifically, the temperature of the melt extrusion is 180–240°C.

[0053] Specifically, the extrusion is performed using a twin-screw extruder.

[0054] Specifically, the twin-screw extruder has a length-to-diameter ratio of 25 to 40:1 and a screw speed of 200 to 600 rpm.

[0055] This invention also protects the application of the above-mentioned color laser marking composition in the manufacture of consumer electronics products, especially suitable for marking white or colored materials.

[0056] Compared with the prior art, the beneficial effects of the present invention are:

[0057] This invention provides a color laser marking composition. By using photosensitive reversible pigments and visible light absorbers, combined with ultraviolet absorbers, it is possible to achieve color laser marking on white or colored matrix resins, with high clarity and color saturation, and the marking is controllable. Detailed Implementation

[0058] The present invention will be further described below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise stated, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0059] Raw materials used in the various embodiments and comparative examples of this invention:

[0060] 1. Raw materials and reagents

[0061] Resin:

[0062] Resin 1: Polypropylene (PP), PP H1500, purchased from Lotte Chemical Ltd.

[0063] Resin 2: Acrylonitrile-butadiene-styrene terpolymer (ABS), PA-777B, purchased from Chi Mei Industrial Co., Ltd., Taiwan.

[0064] Resin 3: Polymethyl methacrylate (PMMA), PMMA CM-207, purchased from Sinochem Plastics Co., Ltd.;

[0065] Resin 4: Polystyrene (PS), GPPS GP-525, purchased from Jiangsu Luan Qingfeng New Material Co., Ltd.;

[0066] Resin 5: Polyoxymethylene (POM), POM M90-44, purchased from Baotailing Engineering Plastics (Nantong) Co., Ltd.

[0067] pigment:

[0068] Pigment 1: Titanium dioxide, R-69, purchased from Meililian Titanium Industry Co., Ltd.

[0069] Pigment 2: 2-(3-hydroxy-2-quinolinyl)-1,3-indanedione, Solvent Yellow 114, TECHSOL YELLOW E3G, purchased from Shenzhen Dingtai Chemical Co., Ltd.

[0070] Pigment 3: 4-cyano-5-[[5-cyano-2,6-di[(3-methoxypropyl)amino]-4-methyl-3-pyridyl]azo]-3-methyl-2-thiophene carboxylic acid methyl ester, Solvent Red 195, purchased from Kunshan Yuanyuan Plastic Pigment Co., Ltd.

[0071] Pigment 4: Solvent Yellow 10 GN, purchased from LANXESS Deutschland GmbH.

[0072] Pigment 5: Phthalocyanine Green, Pigment Green 7, PV Fast Green GNX, purchased from CLARIANT CHEMICALS.

[0073] Pigment 6: Phthalocyanine Blue, Pigment Blue 15, BF1535, purchased from Xuancheng Yabang Chemical Co., Ltd.

[0074] Photosensitive reversible pigments:

[0075] Photosensitive reversible pigment 1: Azobenzene compound, 4,4'-bis(decoxy)-3-methylazobenzene, purchased from Shanghai Titan Technology Co., Ltd.

[0076] Photosensitive reversible pigment 2: spirozine compound, 1,3-dihydro-1,3,3-trimethyl-6'-(1-piperidinyl)spiro[2H-indole-2,3'-[3H]naphtho[2,1-B][1,4]oxazine], purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0077] Photosensitive reversible pigment 3: Spiropyran compound, spiropyran[1,3,3-trimethylindolebenzodihydropyran], purchased from Shanghai Titan Technology Co., Ltd.;

[0078] Laser marking agent: Iriotec 8825, purchased from Merck Group, Germany.

[0079] UV absorber:

[0080] UV absorber 1: UV-234, benzotriazole UV absorber, 2-(2-hydroxy-3',5'-dicumylphenyl)benzotriazole, purchased from Tianjin Lianlong New Material Co., Ltd.;

[0081] UV absorber 2: UV-1577, a triazine absorber, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol, purchased from Tianjin Lianlong New Materials Co., Ltd.;

[0082] UV absorber 3: UV-531, benzophenone absorber, 2-hydroxy-4-n-octyloxybenzophenone, purchased from Tianjin Lianlong New Materials Co., Ltd.;

[0083] Visible light absorber:

[0084] Visible light absorber 1: 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squamous acid, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0085] Visible light absorber 2: 3,3'-diethyloxacarbonyl iodine, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0086] Visible light absorber 3: Basic Red 12, purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0087] Antioxidant: Antioxidant-1: Mix antioxidant 1010 (commercially available, hindered phenolic antioxidant, BASF) and antioxidant 168 (commercially available, phosphite antioxidant, BASF) at a mass ratio of 1:2;

[0088] Antioxidant-2: Mix antioxidant 1098 (commercially available, hindered phenolic antioxidant, BASF) and antioxidant 168 (commercially available, phosphite antioxidant, BASF) at a mass ratio of 1:2;

[0089] Dispersant:

[0090] Dispersant 1: Oxidized polyethylene wax (OPE wax), Jiangsu Wannapu Company.

[0091] Dispersant 2: Zinc stearate, Tianjin Langhu Technology Co., Ltd.

[0092] It should be noted that the same raw materials were used in the parallel experiments of the embodiments and comparative examples in this invention.

[0093] 2. The color laser marking compositions of the various embodiments and comparative examples of the present invention are obtained by the following preparation method:

[0094] According to the formula, the resin, photosensitive reversible color powder, pigment, ultraviolet absorber, antioxidant and dispersant are weighed and mixed evenly, and then added to a twin-screw extruder. The mixture is melt-extruded and granulated to obtain a colored laser marking composition. The melt extrusion temperature is 200℃, the length-to-diameter ratio of the twin-screw extruder is 40:1, and the rotation speed of the twin-screw extruder is 400rpm.

[0095] 3. Performance Testing:

[0096] The colored laser marking compositions prepared in each embodiment and comparative example were measured according to the following laser marking method and color measurement method:

[0097] Laser marking method: Shenzhen Han's Ultraviolet Laser Marking Machine UV-3X (laser beam output power is 3W), laser wavelength is 355nm, laser marking process: frequency 25KHz, speed 1000mm / s, current: 1A, marking 30mm×30mm squares on a flat plate for color measurement and testing.

[0098] Color measurement method: Using a spectrophotometer in reflectance mode, the L*, a*, and b* values ​​of the color of a 30mm × 30mm square before and after laser marking are measured in the CIE Lab color space. The spectrophotometer is an X-rite Color-Eye 7000A spectrophotometer. By measuring the spectral reflectance factor or spectral transmittance of the object, the tristimulus values ​​of the sample color are calculated and converted into CIE Lab values.

[0099] L* represents lightness, ranging from 0 to 100, indicating colors from dark (black) to light (white).

[0100] a* represents red and green, and the value changes from positive to negative, indicating the color changes from red to green.

[0101] b* represents yellow to blue, and the value changes from positive to negative, indicating a color change from yellow to blue.

[0102] DL* represents the difference in brightness; a positive value indicates a lighter (whiter) lightness, while a negative value indicates a darker (blacker) lightness.

[0103] Da* represents the difference between red and green; a positive value indicates more red, and a negative value indicates more green.

[0104] Db* represents the difference between yellow and blue; a positive value indicates more yellow, and a negative value indicates more blue.

[0105] DE represents the total color difference. The calculation formula is as follows:

[0106] DE=(DL*^2+Da*^2+Db*^2)^0.5

[0107] The larger the DE value of the color change before and after laser marking, the better it reflects the marking contrast of the material;

[0108] Marking effect evaluation: Marking is controllable if the pattern obtained by marking is within (30±1mm)×(30±1mm) under visible light; marking is uncontrollable if the pattern obtained by marking is not within (30±1mm)×(30±1mm) under visible light.

[0109] Color durability test for marking: After the marked sample is placed under visible light for 500 hours, the color parameters are measured and the color is recorded. The color difference between the color immediately after marking and the color after 500 hours under visible light is calculated. The smaller the color difference, the better the durability. Specifically: a color difference value greater than or equal to 10 is recorded as +, a color difference value of 5 to 10 (inclusive of 5, excluding 10) is recorded as +++, a color difference value of 2 to 5 (inclusive of 2, excluding 5) is recorded as ++++, and a color difference value less than 2 is recorded as +++++.

[0110] Examples 1-28 and Comparative Examples 1-13

[0111] The dosage and performance test results of each component in the color laser marking compositions of Examples 1-28 and Comparative Examples 1-13 are shown in Tables 1-3.

[0112] Table 1. Dosage (parts by weight) and test results of each component in the color laser marking compositions of Examples 1-17

[0113]

[0114]

[0115]

[0116]

[0117] Table 2. Components (parts by weight) and test results of the color laser marking compositions in Examples 18-28

[0118]

[0119]

[0120]

[0121] Table 3. Amounts (parts by weight) of each component in the laser marking compositions of Comparative Examples 1–13 and test results.

[0122]

[0123]

[0124] As can be seen from Tables 1 and 2, the color laser marking compositions prepared in the various embodiments of the present invention can change from white or color before marking to other colors, and the contrast is high. The color difference before and after marking is not less than 20, and the laser marking effect is controllable.

[0125] As can be seen from Examples 1 to 10, the effect is better when ABS, PMMA or PS are selected as the resin substrate, and the effect is best when PMMA is selected.

[0126] As can be seen from Comparative Examples 1 to 10, if no photosensitive reversible pigment is added, the laser marking composition will be black or gray after marking, and will not be able to form a color effect.

[0127] As can be seen from Comparative Example 11, if no ultraviolet absorber is added, even if a laser marking composition is made with added photosensitive reversible pigment, although color marking can be achieved, the marking effect is uncontrollable, and non-marking areas will also change color.

[0128] As can be seen from Comparative Example 12, using traditional marking agents results in black markings and cannot produce colored markings.

[0129] As can be seen from Comparative Example 13, if no visible light absorber is added, even if the marking is colored, it will immediately fade to colorless under visible light and cannot maintain the color.

[0130] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A color laser marking composition characterized in that, The composition comprises the following components by weight: Resin 88-110 parts; Photosensitive reversible toner 0.1-5 parts; Visible light absorber 0.01-1 part; Pigment 0.1-2 parts; Ultraviolet absorber 0.05-1 part; The photosensitive reversible toner comprises one or more of spiropyran compounds, spirooxazine compounds, azobenzene compounds, diarylethene compounds or fulgide compounds; the visible light absorber comprises one or more of Basic Red 12, 1-butyl-2-[5-(1-butyl-1,3-dihydro-3,3-dimethyl-2H-indol-2-ylidene)-pent-1,3-diphenyl]-3,3-dimethyl-3H-indolium hexafluorophosphate, 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indolium chloride, 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squaric acid, 3,3'-diethyl oxacarbocyanine iodine, 3-butyl-2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]-1,1-dimethyl-1H-benzo[E]indolium tetrafluoroborate, 4,5:4',5'-diphenyl-1,1'-dibutyl-3,3,3',3'-tetramethylindolium dicarboxy cyanide hexafluorophosphate, 1-butyl-5-[2-(1-butyl-3,3-dimethyl-1,3-dihydroindol-2-ylidene)ethylidene]-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile, [5-[2-(3-ethyl-3H-benzothiazol-2-ylidene)ethylidene]-4-oxo-2-thioxothiazolidin-3-yl]acetic acid, 2-[3-(3-butyl-1,3-dihydro-1,1-dimethyl-2H-benzo[E]indol-2-ylidene)-1-propen-1-yl]-1,1,3-trimethyl-1H-benzo[E]indolium hexafluorophosphate or 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indolium tetrafluoroborate.

2. The color laser marking composition according to claim 1, wherein The photosensitive reversible toner is one or more of azobenzene compounds, spirooxazine compounds or fulgide compounds.

3. The color laser marking composition according to claim 1, wherein The resin comprises one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, polyformaldehyde, polybutylene terephthalate, polyamide, acrylonitrile-butadiene-styrene terpolymer or polymethyl methacrylate.

4. The color laser marking composition according to claim 3, wherein The resin is one or more of acrylonitrile-butadiene-styrene terpolymer, polymethyl methacrylate or polystyrene.

5. The color laser marking composition according to claim 3, wherein The resin is polymethyl methacrylate.

6. The color laser marking composition according to claim 1, wherein The ultraviolet absorber comprises one or more of benzophenone absorbers, benzotriazole absorbers or triazine absorbers.

7. The color laser marking composition according to claim 6, wherein The ultraviolet absorber is benzotriazole absorber and / or triazine absorber.

8. The color laser marking composition of claim 1, wherein, The pigments include one or more of white, red, yellow, green, blue or violet pigments.

9. The color laser marking composition of claim 1, wherein, Also included are 0.1-2 parts of an antioxidant and / or 0.5-5 parts of a dispersing agent.

10. The color laser marking composition according to claim 9, wherein, The antioxidant includes one or more of a hindered phenol antioxidant and / or a phosphite antioxidant; and the dispersing agent includes one or more of zinc stearate, calcium stearate, magnesium stearate, polyethylene wax or oxidized polyethylene wax.

11. A method of preparing the color laser marking composition according to any one of claims 1 to 10, characterized in that, The method includes the following steps: The components are mixed uniformly, melt-extruded and granulated to obtain the colored laser marking composition.

12. Use of the colored laser marking composition of any one of claims 1-10 in the manufacture of a consumer electronic product.

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