A method for improving the color fastness of printing color film gloss ink and its uses

Abstract

The present invention discloses a method for improving the color fastness of printing ink for enhancing the glossiness of a printed color film. The printed color film is a composite BOPP film, and the method comprises the following steps: (1) pretreating the outer surface and the inner surface of the composite BOPP film; (2) coating the outer surface and the inner surface of the composite BOPP film with a surface modification coating agent and drying at high temperature; (3) printing the outer surface of the composite BOPP film with water-based color ink, and the printed color film is obtained after drying. The present invention also discloses the use of the high-printing color film obtained by the method for improving the color fastness of printing ink for enhancing the glossiness of a tobacco packaging film.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco, and particularly relates to a method and use for improving the glossiness and oil black fastness of a printed color film. Background Art

[0002] The cigarette packaging film is generally a BOPP film. During the production process of the BOPP film, it undergoes biaxial stretching. Therefore, the BOPP film has high tensile strength, high impact strength, excellent rigidity, toughness and transparency, outstanding anti-tensile strength, anti-impact strength, high stiffness and high transparency; the BOPP film is colorless, odorless, tasteless and non-toxic, and is a commonly used packaging material in the tobacco industry.

[0003] Due to the characteristics of the BOPP film such as light weight, non-toxicity, high mechanical strength, good dimensional stability, and good transparency, it is widely used in the packaging of candies, cigarettes, textiles, foods, etc. However, some characteristics of the BOPP film limit its application: (1). The biaxially oriented polypropylene film is a non-polar high polymer, and the surface is mainly exposed with methyl groups, so its surface free energy is extremely low, resulting in poor hydrophilicity, printability, adhesiveness, and dyeability on its surface, which greatly limits its application range and makes its adhesiveness and printing and dyeing properties relatively poor; (2) The tertiary carbon atoms and methyl groups in the biaxially oriented polypropylene film molecules carry active H elements, and are prone to oxidative degradation reactions under the action of external oxygen and other conditions, which is not conducive to its long-term storage and use.

[0004] High-grade cigarette products currently generally use printed color films for decorative packaging. Glossiness and haze are two important indicators of the optical properties of the BOPP film. Films with low haze and high glossiness will make the appearance of cigarettes more high-grade and bring a bright visual effect to the cigarette package. Compared with traditional unprinted cigarette films, printed color films require large-area printing of multiple colors, and the printing process of printed color films is complex. If organic solvents used in printing erode the macromolecular chains of the printed color film (the cigarette film is generally BOPP); therefore, water-based inks are generally used, and the drying process of printing is about 40°C, resulting in a certain degree of loss of the physical indicators of the printed color film, especially the loss of performance indicators such as glossiness is relatively large.

[0005] Water-based inks need to dry quickly and have good re-dissolvability; generally, inks that dry quickly have poor re-dissolvability; inks with good re-dissolvability are poor in water resistance, dry slowly, and the vehicle speed cannot be increased. For water-based inside printing inks, it is required to have good adhesion fastness with the composite glue, and there should be no blistering or delamination. The ink layer of inside printing is in direct contact with the glue and cannot be corroded by the glue on the printing surface. The vehicle speed of the inside printing equipment is high, and there is a high requirement for the quick drying of the ink, generally above 180 meters per minute.

[0006] In addition, for the gloss and haze of BOPP films, there is a tendency to deteriorate over time. Therefore, it is necessary to develop a new anti-blocking masterbatch and apply it to BOPP films, while optimizing the film formulation to improve the optical properties and stability of BOPP films.

[0007] For this reason, the present invention is proposed. Summary of the Invention

[0008] The present invention provides a method for improving the gloss of printed color films, and the obtained printed color films are used for tobacco packaging films, which have good light transmittance and gloss properties and high ink color fastness.

[0009] The technical solution of the present invention is as follows:

[0010] In a first aspect of the present invention, a method for improving the gloss and ink color fastness of printed color films is disclosed. The printed color film is a composite BOPP film, and the method includes the following steps:

[0011] (1) Pretreat the outer surface and inner surface of the composite BOPP film;

[0012] (2) Coat the outer surface and inner surface of the composite BOPP film with a surface modification coating agent and dry at high temperature;

[0013] (3) Print the outer surface of the composite BOPP film with water-based color ink, and the printed color film is obtained after drying.

[0014] Preferably, the composite BOPP film is three-layered. The surface layer is a blend film of copolymerized PP, silica, phenyl-modified silicone, and hydrogenated petroleum resin; the core layer is a blend film of homopolymerized PP, antistatic agent, and hydrogenated petroleum resin; the inner layer is a blend film of copolymerized PP, phenyl-modified silicone, and hydrogenated petroleum resin.

[0015] Preferably, the silica content in the surface layer is not higher than 0.08 wt%, the phenyl-modified silicone content is 0.05 - 0.10 wt%, and the hydrogenated petroleum resin content is 3.0 - 5.0 wt%; in the core layer, the antistatic agent is a mixture of alkyl diethanolamine and monoglyceride, the antistatic agent content is 0.35% - 0.45 wt%, and the hydrogenated petroleum resin content is 10.0 - 15.0 wt%; in the inner layer, the phenyl-modified silicone content is 0.10 - 0.20 wt%, and the hydrogenated petroleum resin content is 1.0 - 2.0 wt%.

[0016] Preferably, in step (1), the outer surface of the composite BOPP film is pretreated by low-temperature plasma surface activation treatment, and the gas used is CO2; the inner surface of the composite BOPP film is treated by corona treatment, and the corona treatment voltage is 10 - 20 kV and the frequency is 2 - 5 kHz.

[0017] Preferably, the surface modification coating agent in step (2) comprises: an aqueous silane coupling agent, tetraethyl orthosilicate, a solid acid, and water, and their mass ratio is (5 - 10)∶(50 - 100)∶(5 - 10)∶(300 - 400).

[0018] Preferably, the aqueous silane coupling agent is one of methyltrichlorosilane (MTS) or an amino silane; the solid acid is ethylenediaminetetraacetic acid.

[0019] Preferably, the preparation of the surface modification coating agent comprises the following steps: adding the aqueous silane coupling agent and the solid acid into water for dissolution, and then dropwise adding tetraethyl orthosilicate under high-speed stirring. After the reaction is completed, the surface modification coating agent is obtained.

[0020] Preferably, the surface modification coating agent in step (2) is applied by spraying; the drying temperature is 80 - 100 °C.

[0021] Preferably, the drying temperature after printing in step (3) is 40 - 50 °C.

[0022] The second aspect of the present invention discloses the use of the high-printing color film obtained by the above method for improving the glossiness and ink color fastness of the printing color film for tobacco packaging films.

[0023] Advantages of the present invention:

[0024] 1. The printing color film obtained by the method of the present invention has improved glossiness, and the haze and transparency are not affected or slightly improved, and the ink color fastness is high. When used for tobacco packaging films, its machine adaptability is good. Note: Haze is the ratio of the scattered light flux deviating from the incident light direction to the transmitted light flux through the specimen, expressed as a percentage. The wearable capability is the performance of the film surface to withstand damage under the action of external friction; generally, it is expressed by the change in haze value, that is, after the film is rubbed under a certain pressure, speed, and number of times, the difference obtained by subtracting the original haze value before rubbing from the haze value after rubbing; the smaller the difference, the better the wearable capability and the higher the ink color fastness, and vice versa.

[0025] 2. The method for improving the glossiness of printed color film in the present invention uses a three-layer composite BOPP film; the surface layer, the core layer, and the inner layer all contain hydrogenated petroleum resin. The refractive index of the hydrogenated petroleum resin is approximately 1.51, which is very close to the refractive index of BOPP (about 1.49). Both are non-polar materials with similar structures and have good compatibility; the hydrogenated petroleum resin is an amorphous oligomer, and PP is a semi-crystalline polymer. The addition of the hydrogenated petroleum resin expands the amorphous region of the composite material, significantly changes the aggregated state structure of the PP polymer chains, partially dissolves the crystal structure of PP, reduces the melting point of PP (from 161 - 162 °C to 140 - 150 °C), and refines the crystal grains of PP. Therefore, the transparency of PP is improved, and the haze remains unchanged or decreases. Additionally, the surface layer and the inner layer also contain phenyl-modified silicone, and the kinematic viscosity of the phenyl-modified silicone is 100 - 280 mm 2 / s, which has a refractive index closer to that of PP, improving the glossiness and transparency of the BOPP film surface.

[0026] 3. In order to improve the bonding performance between the surface modification coating agent and the surface of the composite BOPP film, the method of the present invention performs low-temperature plasma surface activation treatment on the outer surface of the composite BOPP film, and the gas used is CO2; corona treatment is performed on the inner surface of the composite BOPP film, and the voltage of the corona treatment is 2 - 100 kV, and the frequency is 2 - 10 kHz. Since the surface layer of the composite BOPP film in the present invention is a blend film of copolymerized PP, silica, phenyl-modified silicone, and hydrogenated petroleum resin, after low-temperature plasma surface activation treatment with CO2, the bonding ability between the surface modification coating agent and it is greater. After water-based color ink printing, the glossiness of the color film is higher, and at the same time, the wear resistance is improved. The inner layer is a blend film of copolymerized PP, hydrogenated petroleum resin, and phenyl-modified silicone. After corona treatment with a voltage of 10 - 20 kV and a frequency of 2 - 5 kHz, the bonding ability between the surface modification coating agent and it is good, and the peeling strength of the later-formed coating film is high, and there will be no "scuffing" phenomenon; at the same time, because many active points will be formed on the surface after corona treatment, the bonding at these active points with the surface modification coating agent is tight, and there are almost no gaps on the entire BOPP surface. Therefore, the gas barrier property is improved. Through the analysis after low-temperature plasma surface activation treatment of the composite BOPP film with CO2, polar groups such as -COOH and -OH are successfully introduced on the outer surface of the composite BOPP film, significantly increasing the surface free energy and improving the interfacial bonding ability between the outer surface of the composite BOPP film and the surface modification coating agent; the glossiness of the outer surface of the composite BOPP film can be significantly improved.

[0027] 4. For the surface-modified coating agent of the present invention, an aqueous silane coupling agent and a solid acid are first dissolved in water, and then tetraethyl orthosilicate is added dropwise under high-speed stirring (the rotation speed is generally 1000 - 5000 rpm) to prepare a surface-modified coating agent with good transparency and gloss for the first time. After analysis, in the surface-modified coating agent, the particles are about 30 nm and the particle sizes are uniform.

[0028] 5. After the outer surface of the composite BOPP film of the present invention is surface-activated by CO2 low-temperature plasma, the surface-modified coating agent is coated, and then the outer surface of the composite BOPP film is printed with aqueous color ink. The mass of wear is smaller and the gloss is improved. This is because polar groups such as -COOH and -OH generated on the outer surface after CO2 low-temperature plasma surface activation treatment have good hydrophilicity, enabling good bonding performance with the surface-modified coating agent and a uniform coating; the printed color film obtained by printing the outer surface of the composite BOPP film with aqueous color ink is firmly bonded to the surface-modified coating agent layer, and the ink color fastness is high.

[0029] 6. For the composite BOPP film obtained by the preparation method of the present invention, the gloss performance and ink color fastness are still good after natural aging for one year. Specific embodiments

[0030] The following is described in conjunction with embodiments. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention. Other advantages, objectives, and features of the present invention will be described in subsequent embodiments and will be obvious to those skilled in the art to some extent, or those skilled in the art can obtain teachings from the practice of the present invention.

[0031] In order to improve the gloss of the BOPP printed color film without losing abrasion resistance, the present invention proposes a method for improving the gloss of the printed color film to obtain a high-gloss printed color film for tobacco packaging film with improved gloss without losing its light transmittance and abrasion resistance.

[0032] The method for improving the gloss of a printed color film, where the printed color film is a composite BOPP film, and the method includes the following steps: (1) Pretreat the outer surface and the inner surface of the composite BOPP film; the composite BOPP film is three-layered. The surface layer is a blend film of copolymerized PP, silicon dioxide, phenyl-modified silicone, and hydrogenated petroleum resin. The content of silicon dioxide in the surface layer is not higher than 0.08 wt%, the content of phenyl-modified silicone is 0.05 - 0.10 wt%, and the content of hydrogenated petroleum resin is 3 - 5 wt%. The core layer is a blend film of homopolymerized PP, an antistatic agent, and hydrogenated petroleum resin. The antistatic agent in the core layer is a mixture of alkyl diethanolamine and monoglyceride, the content of the antistatic agent is 0.35% - 0.45 wt%, and the content of hydrogenated petroleum resin is 10 - 15 wt%. The inner layer is a blend film of copolymerized PP, phenyl-modified silicone, and hydrogenated petroleum resin. The content of phenyl-modified silicone in the inner layer is 0.10 - 0.20 wt%, and the content of hydrogenated petroleum resin is 1 - 2 wt%. The pretreatment of the outer surface of the composite BOPP film is carried out by low-temperature plasma surface activation treatment, and the gas used is CO2. The treatment of the inner surface of the composite BOPP film is carried out by corona treatment, and the voltage of the corona treatment is 10 - 20 kV, and the frequency is 2 - 5 kHz. (2) Coat the outer surface and the inner surface of the composite BOPP film with a surface-modified coating agent. The coating is carried out by spraying and drying at 80 - 100 °C. The composition of the surface-modified coating agent includes: an aqueous silane coupling agent, tetraethyl orthosilicate, a solid acid, and water, and their mass ratio is (5 - 10)∶(50 - 100)∶(5 - 10)∶(300 - 400). The silane coupling agent is one of methyltrichlorosilane (MTS) or amino silane. The solid acid is ethylenediaminetetraacetic acid. The preparation of the surface-modified coating agent includes the following steps: Dissolve the aqueous silane coupling agent and the solid acid in water, and then gradually add tetraethyl orthosilicate dropwise under high-speed stirring. After the reaction is completed, the surface-modified coating agent is obtained. (3) Print the outer surface of the composite BOPP film with an aqueous color ink, and after drying, the printed color film is obtained. The drying temperature after printing is 40 - 50 °C.

[0033] Example 1: The method for improving the gloss of a printed color film (shrink film).

[0034] The three layers of the composite BOPP film: The surface layer is a blend film of copolymerized PP, 0.05 wt% silicon dioxide, 0.05 wt% phenyl-modified silicone, and 4.0 wt% hydrogenated petroleum resin. The core layer is a blend film of homopolymerized PP, 0.40 wt% antistatic agent (the mass ratio of alkyl diethanolamine and monoglyceride is 1∶0.3), and 10.0 wt% hydrogenated petroleum resin. The inner layer is a blend film of copolymerized PP, 0.15 wt% phenyl-modified silicone, and 1.5 wt% hydrogenated petroleum resin.

[0035] Modified coating composition and preparation method: An aqueous silane coupling agent (amino silane), tetraethyl orthosilicate, a solid acid (ethylenediaminetetraacetic acid), and water, with a mass ratio of 5∶100∶10∶300. Add 5 g of amino silane and 10 g of ethylenediaminetetraacetic acid to 300 g (ml) of water and mix to dissolve. Dropwise add 100 g of tetraethyl orthosilicate at 3000 rmp, and stir for another 10 min after dropping is complete; a transparent and slightly viscous surface-modified coating is obtained.

[0036] The outer surface of the composite BOPP film is pretreated by CO2 low-temperature plasma surface activation treatment; then the surface-modified coating is spray-coated on the outer surface of the composite BOPP film. After drying at 90 °C, the outer surface of the composite BOPP film is printed with an aqueous color ink (commonly used in the market), and after drying at 50 °C, the printed color film is obtained.

[0037] At the same time, the inner surface of the composite BOPP film is treated by corona treatment at 50 kV and 10 kHz, and then the surface-modified coating is spray-coated on the outer surface of the composite BOPP film and dried at 90 °C.

[0038] The obtained printed color film is tested for glossiness and light transmittance, and tested after natural aging for one year. The results are shown in Table 1 below:

[0039] The haze is measured according to the provisions of GB / T 2410 Test Method for Transmittance and Haze of Transparent Plastics.

[0040] The glossiness is measured according to the provisions of GB / T 8807 Test Method for Specular Gloss of Plastics, with an incident angle of 45°. During testing, it should be ensured that the plane formed by the incident and reflected light of the test window of the glossiness tester is parallel to the longitudinal direction of the tobacco film. The backing plate is black and the glossiness should not exceed 0.2%.

[0041] Table 1 Test results of the printed color film obtained in Example 1

[0042] Index Name Unit Industry Average Level Standard Requirement Example 1 After One Year of Natural Aging Haze ％ 1.63 ≤1.5 1.35 1.34 Glossiness ％ 86.9 ≥88 91.2 91.2

[0043] As can be seen from Table 1, the glossiness of the composite BOPP film of the present invention is much higher than the industry average level, and the haze is much lower than the industry average level. After aging for one year, the glossiness and haze hardly change. This fully shows that for the composite BOPP film obtained by the preparation method of the present invention, the glossiness and ink color fastness are significantly improved, and the aging resistance performance is better.

[0044] Machine suitability: The tobacco film samples for machine suitability testing should be stored for 24 h under environmental conditions of temperature 22.0 - 27.0 °C and relative humidity 60% ± 5%, and then subjected to machine tests. During the process, the normal operation of the packaging machine will not be affected due to quality defects of the tobacco film, the effective operation rate of the equipment is improved, and there are no defects such as loose packages and wrinkles that affect the quality of cigarette cartons and packages.

[0045] Example 2: Method for improving the gloss of printed color film (shrink film).

[0046] Three - layer composite BOPP film: The surface layer is a blend film of copolymerized PP, 0.05 wt% silica, 0.05 wt% phenyl - modified silicone, and 4.0 wt% hydrogenated petroleum resin; the core layer is a blend film of homopolymerized PP, 0.40 wt% antistatic agent (mass ratio of alkyl diethanolamine to monoglyceride is 1:0.3), and 10.0 wt% hydrogenated petroleum resin; the inner layer is a blend film of copolymerized PP, 0.15 wt% phenyl - modified silicone, and 1.5 wt% hydrogenated petroleum resin;

[0047] Composition and preparation method of the modified coating agent: Aqueous silane coupling agent (amino - silane), tetraethyl orthosilicate, solid acid (ethylenediaminetetraacetic acid), and water, with a mass ratio of 5:50:5:300. Add 5 g of amino - silane and 5 g of ethylenediaminetetraacetic acid to 300 g (ml) of water and mix and dissolve. Dropwise add 50 g of tetraethyl orthosilicate at 3000 rmp. After dropping, stir for another 10 min; a 5 - transparent slightly viscous surface - modified coating agent is obtained;

[0048] The outer surface of the composite BOPP film is pretreated by CO2 low - temperature plasma surface activation treatment; then the surface - modified coating agent is spray - coated on the outer surface of the composite BOPP film. After drying at 90 °C, the outer surface of the composite BOPP film is printed with aqueous color ink (commonly used in the market). After drying at 50 °C, the described printed color film is obtained;

[0049] At the same time, the inner surface of the composite BOPP film is treated by corona treatment at 50 kV and 10 kHz, and then the surface - modified coating agent is spray - coated on the outer surface of the composite BOPP film and dried at 90 °C;

[0050] Same as Example 1, the obtained printed color film is tested for gloss and light transmittance. The results are shown in Table 2 below:

[0051] Table 2 Test results of the printed color film obtained in Example 2

[0052] Index Name Unit Industry Average Level Standard Requirement Example 2 After One Year of Natural Aging Haze ％ 1.63 ≤1.5 1.29 1.28 Glossiness ％ 86.9 ≥88 91.5 91.3

[0053] The machine adaptability is the same as that in Example 1.

[0054] Example 3: Method for improving the gloss of printed color film (micro - shrink film).

[0055] Three - layer composite BOPP film: The surface layer is a blend film with the content of copolymerized PP, 0.05 wt% silica, 0.05 wt% phenyl - modified silicone and 4.0 wt% hydrogenated petroleum resin; the core layer is a blend film of homopolymerized PP with 0.40 wt% antistatic agent (the mass ratio of alkyl diethanolamine to monoglyceride is 1:0.3) and 10.0 wt% hydrogenated petroleum resin; the inner layer is a blend film of copolymerized PP, 0.15 wt% phenyl - modified silicone and 1.5 wt% hydrogenated petroleum resin;

[0056] Composition and preparation method of the modified coating agent: An aqueous silane coupling agent (amino - silane), tetraethyl orthosilicate, solid acid (ethylenediaminetetraacetic acid) and water, and their mass ratio is 10:50:10:400. Add 10 g of amino - silane and 10 g of ethylenediaminetetraacetic acid into 400 g (ml) of water and mix them to dissolve. Then, dropwise add 50 g of tetraethyl orthosilicate at 3000 rmp. After dropping, stir for another 10 min; a transparent and slightly viscous surface - modified coating agent is obtained;

[0057] The outer surface of the composite BOPP film is pretreated by CO2 low - temperature plasma surface activation treatment; then the surface - modified coating agent is sprayed and coated on the outer surface of the composite BOPP film. After drying at 90 °C, the outer surface of the composite BOPP film is printed with aqueous color ink (commonly used in the market). After drying at 50 °C, the printed color film is obtained;

[0058] At the same time, the inner surface of the composite BOPP film is treated by corona treatment at 50 kV and 10 kHz, and then the surface - modified coating agent is sprayed and coated on the outer surface of the composite BOPP film and dried at 90 °C;

[0059] Same as Example 1, the glossiness and light transmittance of the obtained printed color film are tested, and the results are shown in Table 3 below:

[0060] Table 3 Test results of the printed color film obtained in Example 3

[0061] Index Name Unit Industry Average Level Standard Requirement Example 3 After One Year of Natural Aging Haze ％ 1.60 ≤1.5 1.30 1.29 Glossiness ％ 87.1 ≥88 91.5 91.4

[0062] The machine - runnability is the same as that in Example 1.

[0063] Finally, it should be noted that the above - mentioned preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above - mentioned preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for improving the color fastness of printing ink for enhancing the glossiness of printed color films, characterized in that, The printed color film is a composite BOPP film, and the method includes the following steps: (1) Pretreat the outer surface and the inner surface of the composite BOPP film; the composite BOPP film is three-layered, the surface layer is a blend film of copolymerized PP, silica, phenyl-modified silicone, and hydrogenated petroleum resin; The core layer is a blend film of homopolymerized PP, antistatic agent, and hydrogenated petroleum resin; The inner layer is a blend film of copolymerized PP, phenyl-modified silicone, and hydrogenated petroleum resin; the pretreatment of the outer surface of the composite BOPP film is carried out by low-temperature plasma surface activation treatment, and the gas used is CO2; the treatment of the inner surface of the composite BOPP film is carried out by corona treatment, the voltage of the corona treatment is 10-20 kV, and the frequency is 2-5 kHz; (2) Coat the outer surface and the inner surface of the composite BOPP film with a surface-modifying coating agent and dry at high temperature; The composition of the surface-modifying coating agent includes: aqueous silane coupling agent, tetraethyl orthosilicate, solid acid, and water, and their mass ratio is (5-10):(50-100):(5-10):(300-400); the aqueous silane coupling agent is one of methyltrichlorosilane or amino silane; the solid acid is ethylenediaminetetraacetic acid; (3) Print the outer surface of the composite BOPP film with aqueous color ink, and the printed color film is obtained after drying.

2. The method according to claim 1, characterized in that, The silica content in the surface layer is not higher than 0.08 wt%, the phenyl-modified silicone content is 0.05-0.10 wt%, and the hydrogenated petroleum resin content is 3.0-5.0 wt%; in the core layer, the antistatic agent is a mixture of alkyl diethanolamine and monoglyceride, the antistatic agent content is 0.35%-0.45 wt%, and the hydrogenated petroleum resin content is 10.0-15.0 wt%; in the inner layer, the phenyl-modified silicone content is 0.10-0.20 wt%, and the hydrogenated petroleum resin content is 1.0-2.0 wt%.

3. The method according to claim 1, characterized in that, The preparation of the surface-modifying coating agent includes the following steps: Dissolve the aqueous silane coupling agent and the solid acid in water, and then gradually add tetraethyl orthosilicate dropwise under high-speed stirring. The surface-modifying coating agent is obtained after the reaction is completed.

4. The method according to claim 1, wherein The coating of the surface-modifying coating agent in step (2) is carried out by spraying; the drying temperature is 80-100 °C.

5. The method according to claim 1, characterized in that The drying temperature after printing in step (3) is 40-50 °C.

6. Use of the printed color film obtained by the method according to any one of claims 1-5 for a tobacco packaging film to improve the glossiness and ink color fastness of the printed color film.