A flexible light tape core for correction tape, a method of manufacturing the same, and a correction tape

Abstract

The application discloses a soft light tape core for correction tape, a preparation method of the soft light tape core and a correction tape containing the soft light tape core. The correction tape is prepared by using silica-coated titanium white powder in a formula to form a hiding agent layer with glossiness reaching matt, and a matte PET release film is used as a peeling layer of the tape core, so that the effect of soft light and eye protection is achieved. In addition, the light resistance agent composed of ultraviolet absorbers and light stabilizers is added in the formula, so that the light sensitivity of the soft light tape core for correction tape is reduced, and the service life of the soft light tape core is prolonged.

Description

Technical Field

[0001] This invention relates to the field of matte coating technology, and more particularly to a matte core for correction tape, its preparation method, and correction tape containing the same, which is mainly used for covering and correcting handwriting. Background Technology

[0002] Correction tape is a white, opaque pigment similar to correction fluid, used to correct mistakes made with ballpoint pens, gel pens, fountain pens, and other writing instruments. It offers advantages such as instant writing and convenience. Among existing correction products on the market, correction tape has become one of the most widely used and comprehensive products.

[0003] With the continuous improvement of economic development, correction tape, as a new type of correction product, has begun to be sold to tropical countries such as Southeast Asia and Africa. However, during storage, transportation, and terminal display, it inevitably comes into contact with various harsh environments, such as the high temperatures during summer bulk shipping and the exposure to direct sunlight during terminal display. These environments bring various quality hazards and quality complaints to correction tape products. Previously, correction tape products on the market had not addressed this issue.

[0004] On the other hand, as consumers become increasingly aware of eye protection, current correction tape products on the market do not address this issue. The gloss levels are generally in the range of high to flat, with only a few achieving a matte finish. Furthermore, achieving a matte coating effect is a major challenge for correction tape products. This is because the application method of correction tape coating is completely opposite to that of general coatings. Correction tape coating is first applied to a substrate (release film) and then transferred to paper or other materials during use. Its surface naturally has a high degree of smoothness, resulting in severe reflection problems. A comprehensive improvement in the pigments and formulation of the coating is needed to solve this problem. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems and provide a correction tape product with a gloss level that is matte, protects the eyes from glare, and has good heat and light resistance.

[0006] Specifically, to achieve the above objectives, the present invention provides a soft-light tape core for correction tape. The tape core includes a tape core coating, which sequentially includes a release layer, a masking layer, and an adhesive layer. The masking layer is characterized by comprising a low-reflectivity pigment, and the masking layer has a 60° gloss level of less than 30 GU, preferably less than 25 GU, less than 20 GU, less than 15 GU, less than 10 GU, or less than 8 GU. The low-reflectivity pigment is a porous white pigment consisting of an inorganic matting pigment and a titanium dioxide pigment core encapsulated by an inorganic adhesive.

[0007] Furthermore, the inorganic matting pigment is calcium carbonate particles or silica particles; the average particle size of the inorganic matting pigment is 0.10-0.30 μm, preferably 0.10-0.15 μm, 0.15-0.20 μm, 0.20-0.25 μm, 0.25-0.30 μm or 0.15 μm; the average particle size of the titanium dioxide pigment core is 0.20-0.50 μm, preferably 0.20-0.30 μm, 0.30-0.40 μm, 0.40-0.50 μm or 0.24 μm.

[0008] Furthermore, the low-reflectivity pigment undergoes secondary grinding, resulting in a D50 particle size ranging from 300 to 500 nm.

[0009] Furthermore, the mass ratio of the inorganic binder to the titanium dioxide pigment core is 30:70 to 15:85, preferably 30:70 to 25:75, 25:75 to 20:80, 20:80 to 15:85 or 25:75.

[0010] Furthermore, the components of the opacifier layer include, by weight: 25-35 parts of pigment, 3-5.5 parts of rubber, and 1-2 parts of lightfastness agent, wherein the pigment includes at least 20 parts of low-reflectivity pigment, preferably at least 26 parts, at least 28 parts, at least 30 parts, at least 32 parts, or at least 34 parts of low-reflectivity pigment.

[0011] Furthermore, the lightfastness agent comprises an ultraviolet absorber and / or a light stabilizer, wherein the mass ratio of the ultraviolet absorber to the light stabilizer is 4:8 to 6:8.

[0012] The present invention also provides a correction tape, comprising the soft-focus tape core for any of the correction tapes described above.

[0013] The present invention also provides a method for preparing a soft light core for correction tape, the preparation method comprising: step (1): preparing an initial low reflectivity pigment;

[0014] Step (2): Dissolve the rubber dispersion in a solvent and heat it to above 80°C to obtain mixture A;

[0015] Step (3): Add lightfastness agent, low reflectivity pigment and additives to mixture A, and disperse evenly to obtain mixture B;

[0016] Step (4): The mixture B is ground twice to make the particle size of the low reflective pigment D50 in the range of 300-500nm, so as to obtain the masking agent slurry;

[0017] Step (5): The masking agent slurry is applied to the release layer and dried at a high temperature of 80-120℃ to obtain the masking agent layer;

[0018] Step (6): Apply water-based pressure-sensitive adhesive evenly to the opacifier layer, and dry it at a high temperature of 80-120℃ to obtain the soft light tape core for the correction tape.

[0019] Furthermore, step (1) specifically involves:

[0020] Step (1-1): Disperse titanium dioxide pigment and inorganic matting pigment in water, and mix in sodium silicate aqueous solution;

[0021] Step (1-2): Heat and stir the solution obtained in step (1-1), mix in sulfuric acid aqueous solution and adjust the pH to 7.0-7.5, then let stand;

[0022] Step (1-3): Filter the solution obtained in step (1-1) and perform preliminary grinding on the filtered material to obtain the initial low-reflectivity pigment.

[0023] The present invention has the following beneficial effects:

[0024] 1. Existing technologies rely solely on the rubber itself to resist environmental damage, which cannot promptly terminate the photo-oxidative aging reaction when the rubber undergoes it. The rubber can only passively endure this destructive effect. However, this invention utilizes benzophenone UV absorber and hindered amine light stabilizer to play a role in the early and middle stages of photo-oxidative aging, respectively. The UV absorber can prevent UV light from reaching the rubber molecules in the early stage, while the light stabilizer can capture free radicals generated after the polymer is irradiated by UV light in the middle stage, thus interrupting the photo-oxidative reaction and preventing aging. Therefore, this invention can extend the product's resistance to sunlight.

[0025] 2. Existing technologies use untreated ordinary titanium dioxide and glossy PET release film. When untreated ordinary titanium dioxide is arranged at the nanoscale particle size, its surface is relatively smooth at the microscopic level. The glossy PET release film further increases this smoothness, resulting in greater light reflection. This invention, however, uses silica-coated titanium dioxide in its formulation, combined with a frosted PET release film, to achieve a soft-light effect. The silica-coated titanium dioxide itself has a microporous structure, and the unground, low-reflectivity pigment has an original particle size in the 3-5 μm range, resulting in less light reflection. The use of the frosted PET release film allows the correction tape core coating to peel off from the PET release film, forming a microscopically rough surface, thus achieving a matte finish.

[0026] 3. This invention provides a soft-focus correction tape core, comprising a release layer, an opacifier layer, an adhesive layer, and an opacifier layer formulation, and provides a method for preparing this soft-focus correction tape core. Tape core samples are prepared from the components and weights of various opacifier layer formulations. By testing and comparing the coating adhesion performance, coating opacity, coating rewriting performance, gloss, and coating aging resistance of all tape core samples, it is demonstrated that the soft-focus correction tape core provided by this invention has excellent adhesion performance, opacity performance, rewriting performance, and aging resistance. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a soft light core structure for a correction tape, consisting of a frosted release layer 01, a masking agent layer 02, and an adhesive layer 03, in sequence. Detailed Implementation

[0029] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0030] Example 1

[0031] The correction tape core provided in this embodiment has a thickness of 15μm frosted layer, 20μm opaque layer and 2μm adhesive layer arranged sequentially.

[0032] The release layer provided in this embodiment is a frosted PET release film (Nantong Baoyan), with an internal peel force of 15-20g / 25mm and an external peel force of 8-13g / 25mm. Other substrate materials besides the polyester film PET release film in this embodiment can be developed laterally with reference to this embodiment.

[0033] Preparation of low-reflectivity pigment: 43g of titanium dioxide powder (average particle size: 0.24μm) and 27.6g of calcium carbonate powder (average particle size: 0.15μm) were dispersed in 273.2g of pure water. 38.8g of water glass (sodium silicate aqueous solution) was added to the solution and mixed to prepare a sodium silicate solution containing titanium dioxide pigment and calcium carbonate. The solution was heated to 80°C with stirring, and 1.8wt% sulfuric acid aqueous solution was added sequentially over 3 hours to adjust the pH to 7.0-7.5. After standing for 6 hours, a composite pigment of titanium dioxide and calcium carbonate with silica as a binder was obtained. After filtration and grinding, the low-reflectivity pigment of this invention was obtained, with an initial average particle size of 4.3μm.

[0034] In other specific embodiments, besides calcium carbonate, microscopic inorganic materials such as silicon dioxide can also be used as matting pigments. Furthermore, the matting effect can be adjusted by changing the ratio of sodium silicate to titanium dioxide.

[0035] The masking layer formulation provided in this embodiment is as follows by weight:

[0036] Solvent 58 parts toluene

[0037] 34 parts of low-reflectivity pigment (average particle size 4300 nm)

[0038] 2.8 parts ethylene propylene rubber (EPDM 3760P, Dow)

[0039] 0.3 parts isoprene rubber (JH8921, Ningbo Jinhai Chenguang)

[0040] 1.5 parts styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0041] 1 part wetting agent; silane coupling agent (KH560, Jiangsu Chenguang)

[0042] 0.3 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0043] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0044] 0.5 parts lightfastness agent; UV absorber (UV-531, Hubei Jihong)

[0045] 0.8 parts light stabilizer (UV-944, Cytec, USA)

[0046] Antioxidant 0.3 parts (BHT, Lanxess)

[0047] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, a lightfast agent, a low-reflectivity pigment, and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is transferred to a grinding device for appropriate secondary grinding. The particle size D50 of the white pigment is located in the range of 350-450nm to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating device. After high-temperature drying in an oven at 90-110℃, the solvent is removed to obtain a masking agent layer.

[0048] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0049] Example 2

[0050] The correction tape core provided in this embodiment has a thickness of 15μm for the frosted release layer, 20μm for the masking agent layer, and 2μm for the adhesive layer.

[0051] The release layer provided in this embodiment is a frosted PET release film (Nantong Baoyan), with an inner peel force of 15-20g / 25mm and an outer peel force of 8-13g / 25mm.

[0052] The masking layer formulation provided in this embodiment is as follows by weight:

[0053] Solvent 58 parts toluene

[0054] 25 parts of low-reflectivity pigment (average particle size 4300 nm)

[0055] 9 parts of filler (titanium dioxide 902+, Chemours, USA)

[0056] Rubber 3 parts ethylene propylene rubber (EPDM 3760P, Dow)

[0057] 0.3 parts isoprene rubber (JH8921, Ningbo Jinhai Chenguang)

[0058] 1.2 parts styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0059] 0.8 parts wetting agent, silane coupling agent (KH560, Jiangsu Chenguang)

[0060] 0.6 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0061] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0062] 0.5 parts lightfastness agent; UV absorber (UV-531, Hubei Jihong)

[0063] 0.8 parts light stabilizer (UV-944, Cytec, USA)

[0064] Antioxidant 0.3 parts (BHT, Lanxess)

[0065] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, a lightfast agent, low-reflective pigment, filler, and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is transferred to a grinding device for appropriate secondary grinding. The particle size D50 of the white pigment is located in the range of 350-450nm to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating device. After high-temperature drying in an oven at 90-110℃ to remove the solvent, a masking agent layer is obtained.

[0066] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0067] Example 3

[0068] The correction tape core provided in this embodiment has a thickness of 15μm for the frosted release layer, 20μm for the masking agent layer, and 2μm for the adhesive layer.

[0069] The release layer provided in this embodiment is a frosted PET release film (Nantong Baoyan), with an inner peel force of 15-20g / 25mm and an outer peel force of 8-13g / 25mm.

[0070] The masking layer formulation provided in this embodiment is as follows by weight:

[0071] Solvent 58 parts toluene

[0072] 25 parts of low-reflectivity pigment (average particle size 4300 nm)

[0073] 9 parts of filler (titanium dioxide 902+, Chemours, USA)

[0074] 3.5 parts ethylene propylene rubber (EPDM3760P, Dow)

[0075] 1 part styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0076] 0.8 parts wetting agent, silane coupling agent (KH560, Jiangsu Chenguang)

[0077] 0.6 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0078] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0079] 0.5 parts lightfastness agent; UV absorber (UV-531, Hubei Jihong)

[0080] 0.8 parts light stabilizer (UV-944, Cytec, USA)

[0081] Antioxidant 0.3 parts (BHT, Lanxess)

[0082] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, a lightfast agent, low-reflective pigment, filler, and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is transferred to a grinding device for appropriate secondary grinding. The particle size D50 of the white pigment is located in the range of 350-450nm to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating device. After high-temperature drying in an oven at 90-110℃ to remove the solvent, a masking agent layer is obtained.

[0083] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0084] Comparative Example 1

[0085] This embodiment provides a correction tape core, comprising a 15μm thick frosted release layer, a 20μm thick opacifier layer, and a 2μm thick adhesive layer arranged sequentially.

[0086] The frosted release layer is a frosted PET release film (Nantong Baoyan), with an inner peel force of 15-20g / 25mm and an outer peel force of 8-13g / 25mm.

[0087] The formulation of the covering layer is as follows, by weight:

[0088] Solvent 58 parts toluene

[0089] 34 parts of low-reflectivity pigment (average particle size 4300 nm)

[0090] 2.8 parts ethylene propylene rubber (EPDM 3760P, Dow)

[0091] 0.3 parts isoprene rubber (JH8921, Ningbo Jinhai Chenguang)

[0092] 1.5 parts styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0093] 1 part wetting agent; silane coupling agent (KH560, Jiangsu Chenguang)

[0094] 0.3 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0095] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0096] Antioxidant 0.3 parts (BHT, Lanxess)

[0097] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, low-reflectivity pigments and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is transferred to a grinding device for appropriate secondary grinding. The particle size D50 of the white pigment is located in the range of 350-450nm to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating device. After high-temperature drying in an oven at 90-110℃, the solvent is removed to obtain a masking agent layer.

[0098] The adhesive layer is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0099] Comparative Example 2

[0100] This embodiment provides a correction tape core, comprising a 15μm thick frosted release layer, a 20μm thick opacifier layer, and a 2μm thick adhesive layer arranged sequentially.

[0101] The frosted release layer is a frosted PET release film (Nantong Baoyan), with an inner peel force of 15-20g / 25mm and an outer peel force of 8-13g / 25mm.

[0102] The formulation of the covering layer is as follows, by weight:

[0103] Solvent 58 parts toluene

[0104] Pigment 34 parts titanium dioxide (Titanium Dioxide 902+, Chemours, USA)

[0105] 2.8 parts ethylene propylene rubber (EPDM 3760P, Dow)

[0106] 0.3 parts isoprene rubber (JH8921, Ningbo Jinhai Chenguang)

[0107] 1.5 parts styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0108] 1 part wetting agent; silane coupling agent (KH560, Jiangsu Chenguang)

[0109] 0.3 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0110] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0111] 0.5 parts lightfastness agent; UV absorber (UV-531, Hubei Jihong)

[0112] 0.8 parts light stabilizer (UV-944, Cytec, USA)

[0113] Antioxidant 0.3 parts (BHT, Lanxess)

[0114] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, a lightfast agent, a low-reflectivity pigment, and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is transferred to a grinding device for appropriate secondary grinding. The particle size D50 of the white pigment is located in the range of 350-450nm to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating device. After high-temperature drying in an oven at 90-110℃, the solvent is removed to obtain a masking agent layer.

[0115] The adhesive layer is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0116] Comparative Example 3

[0117] This embodiment provides a correction tape core, comprising a 15μm thick frosted release layer, a 20μm thick opacifier layer, and a 2μm thick adhesive layer arranged sequentially.

[0118] The frosted release layer is a frosted PET release film (Nantong Baoyan), with an inner peel force of 15-20g / 25mm and an outer peel force of 8-13g / 25mm.

[0119] The formulation of the covering layer is as follows, by weight:

[0120] Solvent 58 parts toluene

[0121] 25 parts of low-reflectivity pigment (average particle size 4300 nm)

[0122] 9 parts of filler (titanium dioxide 902+, Chemours, USA)

[0123] 2.8 parts ethylene propylene rubber (EPDM 3760P, Dow)

[0124] 0.3 parts isoprene rubber (JH8921, Ningbo Jinhai Chenguang)

[0125] 1.5 parts styrene-butadiene rubber (HS-60, Yantai Shiyuan)

[0126] 1 part wetting agent; silane coupling agent (KH560, Jiangsu Chenguang)

[0127] 0.3 parts of sodium fatty alcohol polyoxyethylene ether sulfate (C24E2S, Linyi Lusen)

[0128] 0.5 parts calcium-based grease (#3, Qingdao Nengqiang)

[0129] Antioxidant 0.3 parts (BHT, Lanxess)

[0130] Ethylene propylene rubber, isoprene rubber, and styrene-butadiene rubber are dispersed in a solvent and heated to 90-100℃ to obtain mixture A. Then, low-reflective pigments and additives, including wetting agents, lubricants, and antioxidants, are added to mixture A. After uniform dispersion, mixture B is obtained. Mixture B is not subjected to secondary grinding to obtain a masking agent slurry. The masking agent slurry is coated onto a frosted PET release film using a roller coating equipment. After high-temperature drying in an oven at 90-110℃ to remove the solvent, a masking agent layer is obtained.

[0131] The adhesive layer is a water-based acrylic pressure-sensitive adhesive (PS-2020L, Dow). The water-based pressure-sensitive adhesive is evenly coated onto the above-mentioned masking layer using a stainless steel mesh roller. After being dried at high temperature in an oven at 90-110℃ to remove moisture, a correction tape core is obtained by sequentially stacking the masking film layer and the adhesive film layer on the PET release film.

[0132] Test case

[0133] 1. Sample

[0134] After preparation according to Examples 1-3 and Comparative Examples 1-2, the core was cut into strips 5-6 mm wide and assembled into the correction tape housing (ACT52310, Shanghai Chenguang Stationery) to make correction tape samples.

[0135] 2. Test methods

[0136] 2.1 Coating adhesion performance

[0137] Using a coating property detector, draw 3 rows of coatings with a length of 100 mm and a spacing of 5 mm on both the left and right. Then, use an adhesion tester to draw 50-mm circles with a 0.3-mm and 0.5-mm black gel pen under a pressure of 130 g, at a circular speed of 1 circle / s and a paper surface translation speed of 2 mm / s, and draw circles in both directions.

[0138] If the coating is intact without abnormal phenomena such as warping, cracking, and peeling, it is judged as excellent;

[0139] If the coating is partially warped, cracked, or peeled, it is judged as qualified;

[0140] If the coating is incomplete with abnormal phenomena such as warping, cracking, and peeling, it is judged as poor.

[0141] 2.2 Coating hiding performance

[0142] Use a 0.3-mm and 0.5-mm black gel pen to write the character "永" on A4 copy paper under a pressure of ≤300 g, and immediately perform single-layer coating for A4 paper copying.

[0143] If there are no traces left on the copier or fax, and the handwriting is completely invisible, it is judged as excellent;

[0144] If there are slight traces left on the copier or fax, and the handwriting is slightly visible, it is judged as qualified;

[0145] at all. If there are obvious traces on the copier or fax, and the handwriting is completely clear, it is judged as poor.

[0146] 2.3 Coating re-writing performance

[0147] Use a 0.3-mm and 0.5-mm black gel pen to write the character "永" on A4 copy paper under a pressure of ≤300 g. Then, apply a single layer of correction tape on the handwriting, and use a 0.3-mm and 0.5-mm black gel pen to write the character "永" on the surface of the coating under a pressure of ≤300 g.

[0148] If there is no coating rupture, no handwriting diffusion, no adhesion between the coating film and the pen tip, and no plugging phenomenon when applying the coating on the handwriting and during re-writing, it is judged as excellent;

[0149] If there is no coating rupture, no handwriting diffusion, and there is slight adhesion between the coating film and the pen tip and plugging phenomenon when applying the coating on the handwriting and during re-writing, it is judged as qualified;

[0150] If there is coating rupture, handwriting diffusion, adhesion between the coating film and the pen tip, and plugging phenomenon when applying the coating on the handwriting or during re-writing, it is judged as poor.

[0151] 2.4 Glossiness

[0152] The correction tape is continuously coated on A4 copy paper in a single layer to form a rectangle with a size of not less than 50*80 mm (the overlapping width of adjacent two coatings shall not be greater than 1 mm and there shall be no gap), and then the 60° glossiness is measured using a multi-angle glossiness meter.

[0153] When the 60° glossiness is above 75 GU, it can be called high gloss (also known as bright gloss);

[0154] When the 60° glossiness is between 50 and 75 GU, it can be called flat gloss;

[0155] When the 60° glossiness is between 10 and 50 GU, it can be called matte gloss;

[0156] When the 60° glossiness is below 10 GU, it can be called non-gloss.

[0157] 2.5 Aging resistance of the coating

[0158] The correction tape is placed in an ultraviolet box line lamp box with a wavelength of 254 nm and taken out after being continuously placed for 6 months. After standing for 4 h in an environment of 23±2 °C, the adhesion performance, covering performance and re-writing performance of the correction tape are detected:

[0159] If it meets the adhesion performance, covering performance and re-writing performance, it is judged as excellent;

[0160] If it partially meets the adhesion performance, covering performance and re-writing performance, it is judged as qualified;

[0161] If it completely fails to meet the adhesion performance, covering performance and re-writing performance, it is judged as poor.

[0162] The coating property detector used in the test is the HY-543A correction tape coating property detector produced by Wuxi Tianzhirui Technology Co., Ltd.; the adhesion tester is the HY-543B adhesion detector produced by Wuxi Tianzhirui Technology Co., Ltd.; the multi-angle glossiness meter is the AN-2063 glossiness meter produced by Anbona Electronic Technology (Shanghai) Co., Ltd.; the ultraviolet box line lamp box is the HM-6650C ultraviolet box line lamp box produced by Wenzhou Hongming Instruments Co., Ltd.

[0163] 3. Test results

[0164] The test results are shown in Table 1, and the results show that: the soft-gloss correction tape core provided by the present invention has good adhesion performance, covering performance, writing performance and aging resistance.

[0165] Table 1<000033B>

[0166]

[0167] In Comparative Example 1, there is no ultraviolet absorber and light stabilizer, and the aging resistance is poor.

[0168] In Comparative Example 2, the pigment was an unreflective rutile titanium dioxide with high gloss, and the data were in the matte range.

[0169] In Comparative Example 3, the pigments were not subjected to secondary grinding of low-reflectivity pigments, resulting in excessively large particle sizes that affected the coating's opacity and rewriting performance.

[0170] This invention illustrates the detailed process equipment and process flow through the above embodiments. However, this invention is not limited to the detailed process equipment and process flow described above, meaning that this invention does not necessarily depend on the detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the product of this invention, addition of auxiliary components, and selection of specific methods, all fall within the protection scope and disclosure scope of this invention.

[0171] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0172] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A soft-focus tape core for correction tape, the tape core comprising a tape core coating, the tape core coating comprising, in sequence, a release layer, a masking agent layer, and an adhesive layer, characterized in that, The opacifier layer comprises a low-reflectivity pigment, and the opacifier layer has a 60° gloss level of less than 30 GU; the low-reflectivity pigment is a porous white pigment consisting of an inorganic matting pigment and a titanium dioxide pigment core encapsulated by an inorganic binder; the low-reflectivity pigment undergoes secondary grinding, and the D50 particle size of the low-reflectivity pigment is in the range of 300-500 nm; the mass ratio of the inorganic binder to the titanium dioxide pigment core is 30:70 to 15:85; the components of the opacifier layer, by weight, include: 25-35 parts of pigment, 3-5.5 parts of rubber, and 1-2 parts of lightfastness agent, wherein the pigment comprises at least 20 parts of the low-reflectivity pigment.

2. The soft-focus tape core for correction tape according to claim 1, characterized in that, The inorganic matting pigment is calcium carbonate particles or silicon dioxide particles, the average particle size of the inorganic matting pigment is 0.10-0.30 μm, and the average particle size of the titanium dioxide pigment core is 0.20-0.50 μm.

3. The soft-focus tape core for correction tape according to claim 1, characterized in that, The opacifier layer has a gloss level of less than 10 GU at 60°.

4. The soft-focus tape core for correction tape according to claim 1, characterized in that, The lightfastener is composed of a UV absorber and / or a light stabilizer.

5. The soft-focus tape core for correction tape according to claim 4, characterized in that, The mass ratio of the ultraviolet absorber to the light stabilizer is 4:8 to 6:

8.

6. A method for preparing a soft-focus tape core for correction tape, characterized in that, The preparation method is used to prepare the soft-focus tape core for correction tape as described in any one of claims 1-5, and the preparation method includes: Step (1): Prepare the initial low-reflectivity pigment; Step (2): Dissolve the rubber dispersion in a solvent and heat it to above 80°C to obtain mixture A; Step (3): Add lightfastness agent, low reflectivity pigment and additives to mixture A, and disperse evenly to obtain mixture B; Step (4): The mixture B is ground twice to make the particle size of the low reflective pigment D50 in the range of 300-500nm, so as to obtain the masking agent slurry; Step (5): The masking agent slurry is applied to the release layer and dried at a high temperature of 80-120℃ to obtain the masking agent layer; Step (6): Apply water-based pressure-sensitive adhesive evenly to the opacifier layer, and dry it at a high temperature of 80-120℃ to obtain the soft light tape core for the correction tape.

7. The method for preparing a soft-focus tape core for correction tape according to claim 6, characterized in that, Step (1) specifically involves: Step (1-1): Disperse titanium dioxide pigment and inorganic matting pigment in water, and mix in sodium silicate aqueous solution; Step (1-2): Heat and stir the solution obtained in step (1-1), mix in sulfuric acid aqueous solution and adjust the pH to 7.0-7.5, then let stand; Step (1-3): Filter the solution obtained in step (1-2) and perform preliminary grinding on the filtered material to obtain the initial low-reflectivity pigment.

8. A correction tape, characterized in that, Includes the soft-focus tape core for correction tape as described in any one of claims 1-5.

Images