JP2000319568A - Printing ink composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing ink composition excellent in adhesion to a plastic film such as polypropylene film and polyethylene terephthalate film and a paper base such as precoated paper, enabling printing to be carried out at high speed, enabling a polyethylene layer to be processed through extrusion laminating without an adhesive onto a printing surface after printing and excellent in moisture resistance after laminating. SOLUTION: This printing ink composition is characterized by including nitrocellulose, a metal chelate compound and a plasticizing ingredient. The nitrocellulose has a nitrogen content of 8-20 wt.% and an average polymerization degree of 35-110. The metal chelate compound is a titanium chelate compound. The plasticizing ingredient is at least one kind selected from the group consisting of butyral resin, an urethane-based resin and an acrylic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a polypropylene,
The present invention relates to a printing ink composition that can be printed on a film substrate such as polyethylene terephthalate or the like and on a paper substrate such as coated paper.

[0002]

2. Description of the Related Art As a printing ink composition which can be printed on a film such as polypropylene or polyethylene terephthalate, a printing ink composition containing a urethane resin as a main component is known. Although the adhesiveness to the film material was satisfied, there was no ink that was satisfactory in terms of printability such as plate fog and generation of doctor streaks in high-speed printing at a printing speed exceeding about 200 m / min. In addition, an ink containing butyral resin as a main component and polyethyleneimine is known, and has good printability,
Difficulty in moisture resistance after humidification. In addition, there is a case where a polyethylene resin is laminated by an extrusion method without using an adhesive for the purpose of improving the appearance and protecting the printing surface. or,
The laminating process is performed on a paper base material such as coated paper, acid-resistant paper, etc., and an ink mainly containing an acrylic resin, an ink mainly containing nitrified cotton and butyral resin, and the like are known. Poor adhesion to film substrates such as polypropylene and polyethylene terephthalate. In this case, the ink composition is also required to have adhesion to the polyethylene resin layer. That is, there is a demand for a novel printing ink composition having all of these properties in a well-balanced manner.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide good adhesion to a plastic film such as polypropylene or polyethylene terephthalate or a paper substrate such as pre-coated paper, to enable high-speed printing, and to print on a printed surface after printing. It is an object of the present invention to provide a printing ink composition which can be extrusion-laminated with a polyethylene layer without an adhesive and has good moisture resistance after lamination.

[0004]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a printing ink containing nitrified cotton and a metal chelate compound as main components and further adding a plastic component such as butyral resin satisfies the above characteristics. And completed the present invention. That is, the constitution of the present invention is a printing ink composition comprising nitrified cotton, a metal chelate compound and a plastic component. Further, a printing ink composition wherein the metal chelate compound is a titanium chelate compound. Further, there is provided a printing ink composition in which the above-mentioned plastic component is at least one plastic component selected from butyral resin, urethane resin and acrylic resin.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ink composition according to the present invention is, for example, a gravure coat or the like printed on a polypropylene film or polyethylene terephthalate film surface and a paper substrate surface such as precoated paper as a base film, In some cases, polyethylene is extrusion-laminated without an adhesive. A metal deposition layer, a metal foil layer, a paperboard layer, a polyethylene film layer and the like may be laminated on the non-printing surface side of the base film (or paper) as necessary.

As the nitrified cotton, a nitrogen content of 8 to 20% by weight and an average degree of polymerization of 35 to 110 are preferably used, and more preferably a nitrogen content of 10 to 15% and an average degree of polymerization of 45.
~ 95.

The metal components of the metal chelate compound include:
Titanium, aluminum, iron and the like are used, but titanium is preferred.

[0008] Preferable titanium chelates include titanium acetylacetonate, titanium acylate, titanium alkoxide, etc., and titanium acetylacetonate is particularly preferable. The addition amount of titanium chelate is 1 to 25.
% By weight, more preferably 2 to 15% by weight.

As the plastic component, butyral resin, urethane resin, acrylic resin or the like having a relatively low molecular weight is preferably used, and the addition amount is preferably about 1 to 10% by weight, more preferably 2 to 5% by weight.

[0010] As the solvent, an ester solvent such as n-propyl acetate, ethyl acetate or the like, which does not contain toluene and methyl ethyl ketone (MEK), which has a low working environment concentration, that is, poses a great danger to the human body, isopropyl alcohol (IPA) ), An alcoholic solvent such as denatured alcohol, or a mixed solvent thereof. As the amount of the solvent to be added, the nonvolatile content is preferably about 15 to 55%, more preferably 20 to 45%.

As an additive, if necessary, a polyethylene wax for improving abrasion resistance, a pigment for coloring, and the like may be added.

As a raw material to be printed, a plastic film or paper substrate is used, and preferably, a corona discharge-treated polypropylene film film, polyethylene terephthalate film or the like, or coated paper is used.

As the coating method, any method such as gravure coating, silk screen, flexo, etc. is used as long as the solvent drying rate and ink viscosity can be controlled. For example, gravure coating is preferably used.

[0014]

The present invention will be described below in detail with reference to examples. The blending composition and other numerical values represent parts by weight.

[Preparation of Printing Ink Composition (A)] Average degree of polymerization: 45 to 55, nitrogen content: 10.7 to 11.4% by weight
Nitrified cotton manufactured by Asahi Kasei Corporation: LIG1 / 8 (NV 70
%) {12 g, titanium acetylacetonate} manufactured by Matsumoto Yakuhin Kogyo Co., Ltd .: Organix TC-100 (N.V.75)
%) 4 g, butyral resin (Denka Butyral # 2000-L, manufactured by Denki Kagaku Kogyo Co., Ltd.), 69 g of mixed solvent (ethyl acetate: IPA = 30: 70), polyethylene wax (Mitsui Chemicals: High Wax 220MP) 1
g and 10 g of a pigment (manufactured by Dainippon Ink and Chemicals, Inc .: Shimla Fast Red 3013) were kneaded with an attritor for 1 hour to prepare a printing ink composition (A) having a nonvolatile content of 26.4%.

[Preparation of printing ink composition (B)] Average polymerization degree 45-55, nitrogen content 10.7-11.4% by weight
Of nitrified cotton (LIG1 / 8, manufactured by Asahi Kasei Corporation), 10 g of titanium acetylacetonate (Orgatics TC-100, manufactured by Matsumoto Pharmaceutical Co., Ltd.), 4 g of butyral resin (Denka Butyral # 2000-L, manufactured by Denki Kagaku Kogyo Co., Ltd.) 63 g of a mixed solvent (ethyl acetate: IPA = 30: 70),
Polyethylene wax (Mitsui Chemicals: High Wax 2)
20 g) and a pigment (manufactured by Dainippon Ink and Chemicals, Inc .:
10 g of Shimla Fast Red 3013) was kneaded with an attritor for 1 hour to prepare a printing ink composition (B) having a nonvolatile content of 30.9%.

[Preparation of Comparative Printing Ink Composition (C)] Butyral resin (Pioloform BL-1 manufactured by Wacker Inc.)
8, Mn42,000) 20 g, polyethyleneimine ｛manufactured by BASF: Polymine-P (NV 50)
%｝ 3 g, 66 g of a mixed solvent (normal propyl acetate: denatured ethanol = 30: 70), and 1 part of polyethylene wax (manufactured by Mitsui Chemicals: High Wax 220MP)
g, 10 g of a pigment (manufactured by Dainippon Ink and Chemicals, Inc .: Shimla Fast Red 3013) was kneaded with an attritor for 1 hour to prepare a comparative printing ink composition (C) having a nonvolatile content of 32.5%.

[Preparation of Comparative Printing Ink Composition (D)] 40 g of a urethane resin having an average molecular weight Mn of 20,000 (manufactured by Sanyo Chemical Industries, Ltd .: Samprene IB1700, NV 30%), and a mixed solvent (toluene: MEK: IPA = 30: 50) 2
0) and polyethylene wax (manufactured by Mitsui Chemicals, Inc .:
1 g of high wax 220MP), pigment (Shimler Fast Red 3013, manufactured by Dainippon Ink and Chemicals, Incorporated) 1
0 g was ground for 1 hour with an attritor to prepare a printing ink composition (D) having a nonvolatile content of 23%.

[Preparation of Comparative Printing Ink Composition (E)] 12 g of nitrified cotton (LIG 1/8, manufactured by Asahi Kasei Corporation) having an average degree of polymerization of 45 to 55 and a nitrogen content of 10.7 to 11.4% by weight, average polymerization Butyral resin with a degree of 300 (manufactured by Denki Kagaku Kogyo Co., Ltd .:
4 g of denkabutyral # 2000-L), 73 g of a mixed solvent (ethyl acetate: IPA = 30: 70), polyethylene wax (manufactured by Mitsui Chemicals: High Wax 220MP)
And 1 g of a pigment (manufactured by Dainippon Ink and Chemicals, Inc .: Shimla Fast Red 3013) was kneaded with an attritor for 1 hour to prepare a printing ink composition (E) having a nonvolatile content of 23.4%.

[Preparation of Comparative Printing Ink Composition (F)] 20 g of a butyral resin having a weight average molecular weight Mn of 36,000 (Pioloform BL-16, manufactured by Wacker Inc.) and titanium acetylacetonate (Matsumoto Yakuhin Kogyo, Olgatics TC) -100) 4 g, 65 g of a mixed solvent (normal propyl acetate: denatured ethanol = 30: 70), polyethylene wax (manufactured by Mitsui Chemicals, Inc .: High Wax 22)
0MP) and 10 g of a pigment (manufactured by Dainippon Ink and Chemicals, Inc .: Shimla Fast Red 3013) were kneaded with an attritor for 1 hour to prepare a comparative printing ink composition (F) having a nonvolatile content of 34%.

As a base film, a polypropylene film having a thickness of 12 μm subjected to a corona discharge treatment (Trefan 2535 manufactured by Toyo Rayon Co., Ltd.) and a polyethylene terephthalate film having a thickness of 12 μm subjected to a corona discharge treatment (Lumirror manufactured by Toyo Rayon Co., Ltd.) P60) and coated paper having a basis weight of 250 g (Tokyo Paper: Snow Ace) were used.

The printing ink composition (A) prepared above,
(B) and the comparative printing ink compositions (C) to (F) were printed by a gravure coat method under the conditions of a printing speed of 200 m / min and a halftone gravure plate of 25 μm using an FD manufactured by Fuji Machine Industry Co., Ltd. Thereafter, low density polyethylene was extruded and subjected to lamination. The evaluation method and evaluation results are shown below.

[Adhesion] Nichiban Cellotape 12m
The tape is peeled at m, and the degree of peeling of the ink is visually evaluated.

[Polyethylene laminate suitability (PE-E
L))] Immediately after the printed matter is frame-processed, low density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L705 molecular weight Mn28.0
00, density 0.919 g / cm 3) at a temperature of 310 to 3
Melt at 25 ° C. and extrusion laminate to a thickness of 20 μm.

[Hydrogen peroxide solution test] After immersion in 33% hydrogen peroxide solution at 70 ° C for 10 minutes, the plate is washed with running water and visually evaluated for the presence of delamination.

[Adhesiveness after humidification] The adhesiveness after standing for 12 hours in a thermo-hygrostat at 25 ° C. and 90% RH is as described above.
Test in the same manner as the test.

[Printing Suitability] The doctor suitability at a printing speed of 200 m / min is visually evaluated.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

According to the present invention, the adhesiveness to a film such as polypropylene or polyethylene terephthalate or a paper substrate is good, high-speed printing is possible, and after printing, a polyethylene layer is extruded and laminated on a printing surface without an adhesive. It is possible to obtain a printing ink composition which is possible and has good moisture resistance after laminating.

Continued on the front page F term (reference) 4J038 BA081 CE072 CG142 DG002 JC38 KA10 MA14 PC08 PC10 4J039 AB02 AD07 AD09 AD10 AE04 AF07 BA32 BA35 BA37 BC07 BC16 BC19 BC59 EA38 EA43 FA02 GA03 GA09 GA10

Claims (4)

[Claims] 1. A printing ink composition comprising nitrified cotton, a metal chelate compound and a plastic component. 2. The above-mentioned nitrified cotton has a nitrogen content of 8 to 20.
The printing ink composition according to claim 1, wherein the printing ink composition is nitrified cotton having a weight percent of an average degree of polymerization of 35 to 110. 3. The printing ink composition according to claim 1, wherein the metal chelate compound is a titanium chelate compound. 4. The printing ink composition according to claim 1, wherein the plastic component is at least one plastic component selected from a butyral resin, a urethane resin, and an acrylic resin.