JP2021017534A - Coating composition for pencil topcoat - Google Patents
Coating composition for pencil topcoat Download PDFInfo
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- JP2021017534A JP2021017534A JP2019135698A JP2019135698A JP2021017534A JP 2021017534 A JP2021017534 A JP 2021017534A JP 2019135698 A JP2019135698 A JP 2019135698A JP 2019135698 A JP2019135698 A JP 2019135698A JP 2021017534 A JP2021017534 A JP 2021017534A
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- Prior art keywords
- pencil
- coating
- coating composition
- top coat
- topcoat
- Prior art date
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- Granted
Links
- 239000008199 coating composition Substances 0.000 title claims abstract description 54
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000010954 inorganic particle Substances 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 239000011342 resin composition Substances 0.000 claims abstract description 21
- 239000000020 Nitrocellulose Substances 0.000 claims abstract description 17
- 229920001220 nitrocellulos Polymers 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000004922 lacquer Substances 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 40
- 239000003973 paint Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 15
- 238000007645 offset printing Methods 0.000 claims description 14
- 238000010409 ironing Methods 0.000 claims description 12
- 239000010410 layer Substances 0.000 description 42
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000178 monomer Substances 0.000 description 16
- 238000010422 painting Methods 0.000 description 14
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 8
- 229920000193 polymethacrylate Polymers 0.000 description 7
- 238000007639 printing Methods 0.000 description 7
- 238000001723 curing Methods 0.000 description 6
- 239000003999 initiator Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 5
- -1 acryloyloxy group Chemical group 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000000565 sealant Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 229940093475 2-ethoxyethanol Drugs 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 241000218645 Cedrus Species 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
Description
本発明は、鉛筆トップコート用塗料組成物に関する。 The present invention relates to a coating composition for a pencil topcoat.
従来、鉛筆等の筆記具の表面に、滑り止めを目的とした加工を行う技術が知られている。例えば、筆記具表面に凹凸を設け、あるいはラバー様の触感を有する被覆を施す技術が提案されている。 Conventionally, there is known a technique for processing the surface of a writing instrument such as a pencil for the purpose of preventing slipping. For example, a technique has been proposed in which the surface of a writing tool is provided with irregularities or a coating having a rubber-like feel is applied.
特許文献１には、表面に微細な凹凸塗膜を形成した乾漆調鉛筆として、アミド系ポリマーやアクリル系ポリマー等によるポリマー粒子を含む塗料を塗布して、鉛筆軸表面に凹凸を有する塗膜を形成する技術が開示されている。 In Patent Document 1, as a dry lacquer-like pencil having a fine uneven coating film formed on the surface, a paint containing polymer particles made of an amide polymer, an acrylic polymer, or the like is applied to form a coating film having irregularities on the surface of the pencil shaft. The technique of forming is disclosed.
特許文献２には、ラバー様の触感を発現する塗膜を軸表面に有する鉛筆として、水性アクリルシリコンエマルジョン樹脂を含有する層の外層に溶剤型ポリウレタン樹脂を含有する層を備えた鉛筆に関する技術が開示されている。 Patent Document 2 describes a technique relating to a pencil having a coating film that exhibits a rubber-like tactile sensation on the shaft surface, and having a layer containing a solvent-type polyurethane resin as an outer layer of a layer containing an aqueous acrylic silicone emulsion resin. It is disclosed.
特許文献１に開示された技術は、ポリマー粒子により鉛筆軸表面に凹凸を作成するものであるが、鉛筆を把持した際のグリップ感として十分なものが得られない問題がある。また、塗膜の硬化に長時間を要するため生産性が低い問題がある。 The technique disclosed in Patent Document 1 creates irregularities on the surface of the pencil shaft by using polymer particles, but there is a problem that a sufficient grip feeling when gripping the pencil cannot be obtained. In addition, there is a problem that productivity is low because it takes a long time to cure the coating film.
特許文献２に開示された技術は、ラバー様の鉛筆軸表面を有するため、表面がべた付くことで埃や汚れが付着し、外観見栄えが悪化する問題がある。 Since the technique disclosed in Patent Document 2 has a rubber-like pencil shaft surface, there is a problem that the surface becomes sticky and dust and dirt adhere to the surface, resulting in deterioration of the appearance.
本発明は、上記課題に鑑みてなされたものであり、滑りにくく、かつべた付きが少なく、短時間でトップコート層を形成できる鉛筆トップコート用塗料組成物、上記鉛筆トップコート用塗料組成物により形成されたトップコート層を有する鉛筆、及び上記鉛筆トップコート用塗料組成物を鉛筆軸に塗装する塗装工程を含む鉛筆の製造方法を提供することを目的とする。 The present invention has been made in view of the above problems, and is based on a pencil topcoat coating composition that is non-slippery, has little stickiness, and can form a topcoat layer in a short time, and the pencil topcoat coating composition. It is an object of the present invention to provide a pencil having a formed top coat layer, and a method for manufacturing a pencil, which comprises a coating step of applying the above-mentioned paint composition for a pencil top coat to a pencil shaft.
本発明は、無機粒子を含有する、ニトロセルロースラッカー又は光硬化性樹脂組成物からなり、前記無機粒子は、粒子径が１〜３０μｍであり、乾燥重量比で８〜５０重量％含有される、鉛筆トップコート用塗料組成物に関する。 The present invention comprises a nitrocellulose lacquer or a photocurable resin composition containing inorganic particles, the inorganic particles having a particle size of 1 to 30 μm and containing 8 to 50% by weight in dry weight ratio. Regarding paint compositions for pencil topcoats.
また、本発明は、前記鉛筆トップコート用塗料組成物により形成されたトップコート層を有する鉛筆に関する。 The present invention also relates to a pencil having a topcoat layer formed by the pencil topcoat coating composition.
また、本発明は、前記鉛筆トップコート用塗料組成物を、しごき塗装法又はオフセット印刷法により鉛筆軸表面に塗装する塗装工程を含む、鉛筆の製造方法に関する。 The present invention also relates to a method for manufacturing a pencil, which comprises a coating step of coating the surface of the pencil shaft with the coating composition for a pencil top coat by an ironing coating method or an offset printing method.
また、本発明は、前記鉛筆トップコート用塗料組成物により鉛筆軸表面にトップコート層を形成する、鉛筆軸表面の滑り抑制方法に関する。 The present invention also relates to a method for suppressing slippage on the surface of a pencil shaft, which forms a top coat layer on the surface of the pencil shaft with the paint composition for a pencil top coat.
本発明によれば、滑りにくく、かつべた付きが少なく、短時間でトップコート層を形成できる鉛筆トップコート用塗料組成物、上記鉛筆トップコート用塗料組成物により形成されたトップコート層を有する鉛筆、及び上記鉛筆トップコート用塗料組成物を鉛筆軸表面に塗装する塗装工程を含む鉛筆の製造方法を提供できる。 According to the present invention, a pencil topcoat coating composition that is non-slippery, less sticky, and can form a topcoat layer in a short time, and a pencil having a topcoat layer formed by the above pencil topcoat coating composition. , And a method for manufacturing a pencil, which comprises a coating step of applying the above-mentioned paint composition for a pencil top coat to the surface of a pencil shaft.
以下、本発明の実施形態について説明する。なお、本発明は以下の実施形態に限定されない。 Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments.
＜鉛筆トップコート用塗料組成物＞
本実施形態に係る鉛筆トップコート用塗料組成物（以下、単に「塗料組成物」と記載する場合がある）は、鉛筆軸のトップコートとして塗装される塗料組成物である。具体的には、製軸された鉛筆の木軸に対して、シーラー等の目止剤により下地処理を施し、用途に応じて中塗りや印刷等を行ったのち、鉛筆軸の最表面に塗装される塗料組成物である。上記塗装後、乾燥又は紫外線等の光照射が行われ、乾燥塗膜又は硬化膜としてのトップコート層が鉛筆軸表面に形成される。
<Paint composition for pencil top coat>
The paint composition for a pencil top coat according to the present embodiment (hereinafter, may be simply referred to as "paint composition") is a paint composition to be painted as a top coat for a pencil shaft. Specifically, the wooden shaft of the manufactured pencil is grounded with a sealant such as a sealer, and after intermediate coating or printing depending on the application, it is painted on the outermost surface of the pencil shaft. It is a coating composition to be used. After the above coating, drying or irradiation with light such as ultraviolet rays is performed to form a dry coating film or a top coat layer as a cured film on the surface of the pencil shaft.
本実施形態に係る鉛筆トップコート用塗料組成物は、無機粒子を含有する、ニトロセルロースラッカー又は光硬化性樹脂組成物からなる。 The paint composition for a pencil top coat according to the present embodiment comprises a nitrocellulose lacquer or a photocurable resin composition containing inorganic particles.
［ニトロセルロースラッカー］
ニトロセルロースラッカーは、揮発性の高い溶媒にニトロセルロースを希釈し、用途に応じてアルキド樹脂、アクリル樹脂、可塑剤等を加えて調製された塗料である。
上記溶媒としては、特に制限されないが、例えば、酢酸エチル、酢酸ブチル、乳酸エチル等のエステル類、アセトン、メチルエチルケトン、メチルイソブチルケトン、ジアセトンアルコール、シクロヘキサノン等のケトン類、２−エトキシエタノール、エチレングリコールモノブチルエーテル等のエーテル類、メチルアルコール、エチルアルコール、ブチルアルコール等のアルコール類、ベンゼン、トルエン、キシレン、ソルベントナフサ等のタール類が挙げられる。上記溶媒は１種類を単独で用いてもよいし、２種類以上を用いてもよい。
なお、ニトロセルロースラッカーは、本発明の効果を損なわない範囲で他の成分を更に含有していてもよい。例えば、ニトロセルロースラッカーは、揺変剤、消泡剤、分散剤、着色剤等を含有していてもよい。
ニトロセルロースラッカーは塗装後、数十秒〜数分で溶媒が揮発し、塗装表面に乾燥塗膜が形成される。
[Nitrocellulose lacquer]
Nitrocellulose lacquer is a paint prepared by diluting nitrocellulose in a highly volatile solvent and adding an alkyd resin, an acrylic resin, a plasticizer, or the like depending on the intended use.
The solvent is not particularly limited, but for example, esters such as ethyl acetate, butyl acetate and ethyl lactate, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diacetone alcohol and cyclohexanone, 2-ethoxyethanol and ethylene glycol. Examples thereof include ethers such as monobutyl ether, alcohols such as methyl alcohol, ethyl alcohol and butyl alcohol, and tars such as benzene, toluene, xylene and solvent naphtha. One type of the solvent may be used alone, or two or more types may be used.
The nitrocellulose lacquer may further contain other components as long as the effects of the present invention are not impaired. For example, the nitrocellulose lacquer may contain a shaker, an antifoaming agent, a dispersant, a colorant and the like.
In the nitrocellulose lacquer, the solvent volatilizes within several tens of seconds to several minutes after coating, and a dry coating film is formed on the coated surface.
［光硬化性樹脂組成物］
光硬化性樹脂組成物は、光反応性成分と、光重合開始剤と、を含む。
光反応性成分は、光で反応する置換基、例えば（メタ）アクリロイル基、（メタ）アクリロイルオキシ基、ビニル基等のエチレン性不飽和結合を含む置換基を有する成分である。
このような光反応性成分として、分子内にアクリロイル基又はメタクリロイル基のうち少なくともいずれか一方を含む、光重合性（メタ）アクリレートモノマーと、光重合性ポリ（メタ）アクリレートとを含む光硬化性樹脂組成物を例に挙げて、以下説明する。
[Photocurable resin composition]
The photocurable resin composition contains a photoreactive component and a photopolymerization initiator.
The photoreactive component is a component having a substituent containing an ethylenically unsaturated bond such as a photoreactive substituent, for example, a (meth) acryloyl group, a (meth) acryloyloxy group, or a vinyl group.
As such a photoreactive component, a photocurable (meth) acrylate monomer containing at least one of an acryloyl group and a methacryloyl group in the molecule and a photocurable poly (meth) acrylate containing a photopolymerizable poly (meth) acrylate. The resin composition will be described below as an example.
（光重合性（メタ）アクリレートモノマー）
光重合性（メタ）アクリレートモノマーは、調製される光硬化性樹脂組成物の反応性、塗工性等を付与するための反応性希釈剤として用いられる。光重合性（メタ）アクリレートモノマーとしては、例えば、水酸基を有する（メタ）アクリレートモノマーや、鎖状脂肪族炭化水素基を有する（メタ）アクリレートモノマー、脂環基を有する（メタ）アクリレートモノマー、芳香族基を有する（メタ）アクリレートモノマー、ヘテロ環基を有する（メタ）アクリレートモノマー等を適宜選定して用いることができる。
光重合性（メタ）アクリレートモノマーは、分子内に一つのアクリロイル基又はメタクリロイル基を有する単官能モノマーであってもよいし、複数のアクリロイル基又はメタクリロイル基を有する多官能モノマーであってもよい。
(Photopolymerizable (meth) acrylate monomer)
The photopolymerizable (meth) acrylate monomer is used as a reactive diluent for imparting reactivity, coatability, etc. of the prepared photocurable resin composition. Examples of the photopolymerizable (meth) acrylate monomer include a (meth) acrylate monomer having a hydroxyl group, a (meth) acrylate monomer having a chain aliphatic hydrocarbon group, a (meth) acrylate monomer having an alicyclic group, and an aroma. A (meth) acrylate monomer having a group group, a (meth) acrylate monomer having a heterocyclic group, and the like can be appropriately selected and used.
The photopolymerizable (meth) acrylate monomer may be a monofunctional monomer having one acryloyl group or a methacryloyl group in the molecule, or may be a polyfunctional monomer having a plurality of acryloyl groups or methacryloyl groups.
（光重合性ポリ（メタ）アクリレート）
光重合性ポリ（メタ）アクリレートは、共役ジエン系等の重合体の末端や側鎖にアクリロイル基又はメタクリロイル基が結合した重合体であって、例えば数平均分子量が１０００〜１００００程度のアクリレートオリゴマー（プレポリマー）である。
このようなアクリレートオリゴマーとしては、例えば、ウレタン（メタ）アクリレートオリゴマーやエポキシ（メタ）アクリレートオリゴマー、ポリエステル（メタ）アクリレートオリゴマー等を適宜選定して用いることができる。また、光重合性（メタ）アクリレートモノマーと同様、官能基数は特に制限されない。
(Photopolymerizable poly (meth) acrylate)
The photopolymerizable poly (meth) acrylate is a polymer in which an acryloyl group or a methacryloyl group is bonded to the terminal or side chain of a polymer such as a conjugated diene type, and is, for example, an acrylate oligomer having a number average molecular weight of about 1000 to 10000. Prepolymer).
As such an acrylate oligomer, for example, urethane (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, polyester (meth) acrylate oligomer and the like can be appropriately selected and used. Further, as with the photopolymerizable (meth) acrylate monomer, the number of functional groups is not particularly limited.
（光重合開始剤）
光重合開始剤は、紫外線等の光が照射されることによって、ラジカル等の活性種を生成し、光反応性成分の共重合反応を開始させる機能を有する。
光重合開始剤としては、特に制限されないが、例えば、ベンゾフェノン系、アセトフェノン系、アルキルフェノン系、アシルフォスフィンオキサイド系、チオキサントン系、フォスフィンオキサイド系等の光重合開始剤を用いることができる。
(Photopolymerization initiator)
The photopolymerization initiator has a function of generating active species such as radicals by being irradiated with light such as ultraviolet rays and initiating a copolymerization reaction of photoreactive components.
The photopolymerization initiator is not particularly limited, and for example, a benzophenone-based, acetophenone-based, alkylphenone-based, acylphosphine oxide-based, thioxanthone-based, phosphine oxide-based photopolymerization initiator can be used.
光硬化性樹脂組成物は、上述の光重合性（メタ）アクリレートモノマー、光重合性ポリ（メタ）アクリレートから好適なものを選択し、光重合開始剤を配合して均一化することで調製できる。光重合性（メタ）アクリレートモノマー、光重合性ポリ（メタ）アクリレートとしては、１種を用いてもよいし、２種以上を用いてもよい。
光硬化性樹脂組成物は、本発明の効果を損なわない範囲で、上述した成分以外の他の成分を更に含有していてもよい。例えば、酸化防止剤や、光安定剤、硬化促進剤、重合禁止剤、カップリング剤、着色剤、消泡剤等を含有していてもよい。なお、オフセット印刷法を用いて塗装する場合、溶剤を含有しないことが好ましい。
The photocurable resin composition can be prepared by selecting a suitable one from the above-mentioned photopolymerizable (meth) acrylate monomer and photopolymerizable poly (meth) acrylate, and adding a photopolymerization initiator to homogenize the composition. .. As the photopolymerizable (meth) acrylate monomer and the photopolymerizable poly (meth) acrylate, one type may be used, or two or more types may be used.
The photocurable resin composition may further contain components other than the above-mentioned components as long as the effects of the present invention are not impaired. For example, it may contain an antioxidant, a light stabilizer, a curing accelerator, a polymerization inhibitor, a coupling agent, a colorant, an antifoaming agent and the like. When painting using the offset printing method, it is preferable that no solvent is contained.
光硬化性樹脂組成物は、後述する無機粒子と混合されて、塗料組成物として調製されたのち、鉛筆軸に塗装され、紫外光等の光が照射されて、鉛筆軸表面に硬化膜が形成される。 The photocurable resin composition is mixed with inorganic particles described later to be prepared as a coating composition, and then coated on a pencil shaft and irradiated with light such as ultraviolet light to form a cured film on the surface of the pencil shaft. Will be done.
光硬化性樹脂組成物と、後述する無機粒子とを混合して調製される塗料組成物は、オフセット印刷法に適する粘度に調整して用いることが好ましい。上記粘度の調整は、塗料組成物に対して、適宜好適な粘度を有する上述の光重合性（メタ）アクリレートモノマーや光重合性ポリ（メタ）アクリレートやその他の光反応性成分、あるいは、光硬化性樹脂組成物を任意の割合で配合して均一化することで行うことができる。 The coating composition prepared by mixing the photocurable resin composition and the inorganic particles described later is preferably used after adjusting the viscosity to be suitable for the offset printing method. The adjustment of the viscosity is performed by the above-mentioned photopolymerizable (meth) acrylate monomer, photopolymerizable poly (meth) acrylate, other photoreactive component, or photocuring having an appropriately suitable viscosity with respect to the coating composition. This can be done by blending the sex resin composition in an arbitrary ratio and homogenizing it.
光硬化性樹脂組成物と、後述する無機粒子とを混合して調製される塗料組成物は、オフセット印刷法に用いられる硬化条件において、硬化膜表面がべた付かない程度に、ほぼ完全に硬化することが好ましい。例えば、積算光量３００〜７００ｍＪ／ｃｍ２、照射時間数秒〜数十秒、硬化膜厚数μｍ、炉内温度５０〜１５０℃といった条件で、ほぼ完全に硬化することが好ましい。なお、紫外線照射装置は塗料組成物の硬化に適したものを適宜選定できる。 The coating composition prepared by mixing the photocurable resin composition and the inorganic particles described later is almost completely cured under the curing conditions used in the offset printing method to the extent that the surface of the cured film is not sticky. Is preferable. For example, it is preferable to cure almost completely under the conditions of an integrated light intensity of 300 to 700 mJ / cm 2 , an irradiation time of several seconds to several tens of seconds, a curing film thickness of several μm, and a furnace temperature of 50 to 150 ° C. As the ultraviolet irradiation device, one suitable for curing the coating composition can be appropriately selected.
［無機粒子］
無機粒子は、塗料組成物により形成されるトップコート層に凸部を形成し、表面を滑りにくくする機能を付与する、無機材料からなる粒子である。無機粒子は、粒子径が１〜３０μｍであり、塗料組成物中に乾燥重量比で８〜５０重量％含まれる。
なお、本明細書中において、「乾燥重量比」とは、無機粒子を含有するニトロセルロースラッカーからなる塗料組成物においては、乾燥塗膜中の重量比を意味する。また、無機粒子を含有する光硬化性樹脂組成物からなる塗料組成物においては、硬化膜中の重量比を意味する。
無機粒子の粒子径及び含有量を上記範囲とすることで、塗料組成物により形成されるトップコート層表面を滑りにくくする効果が好適に得られる。
なお、本実施形態において、無機粒子の粒子径は、塗料組成物中においてはレーザー回折／散乱法により測定される粒度分布の中央値に対応するＤ５０メジアン径として得られ、トップコート層中においては電子顕微鏡等により無機粒子の一定方向の径を代表径として測定し、任意に３０個測定した数値を平均することで算出できる。
[Inorganic particles]
Inorganic particles are particles made of an inorganic material that form convex portions on the top coat layer formed by the coating composition and impart a function of making the surface less slippery. The inorganic particles have a particle size of 1 to 30 μm and are contained in the coating composition in an amount of 8 to 50% by weight in terms of dry weight ratio.
In the present specification, the "dry weight ratio" means the weight ratio in the dry coating film in the coating composition made of nitrocellulose lacquer containing inorganic particles. Further, in a coating composition composed of a photocurable resin composition containing inorganic particles, it means the weight ratio in the cured film.
By setting the particle size and content of the inorganic particles within the above ranges, the effect of making the surface of the top coat layer formed by the coating composition less slippery can be preferably obtained.
In the present embodiment, the particle size of the inorganic particles is obtained as a D50 median size corresponding to the median particle size distribution measured by the laser diffraction / scattering method in the coating composition, and is obtained in the top coat layer. It can be calculated by measuring the diameter of the inorganic particles in a certain direction as a representative diameter with an electron microscope or the like, and averaging the values measured arbitrarily by 30 particles.
無機粒子の粒子径が１μｍ未満である場合、形成されるトップコート層の滑りにくさが得られず、３０μｍ超である場合、指触が悪化する。上記観点から、無機粒子の粒子径は５〜２５μｍであることが好ましく、１０〜２０μｍであることがより好ましい。 When the particle size of the inorganic particles is less than 1 μm, the slipperiness of the formed top coat layer cannot be obtained, and when it is more than 30 μm, the touch is deteriorated. From the above viewpoint, the particle size of the inorganic particles is preferably 5 to 25 μm, more preferably 10 to 20 μm.
また、無機粒子の含有量を８重量％未満とした場合、形成されるトップコート層の滑りにくさが十分に得られず、５０重量％超とした場合、塗料組成物の粘度等を好ましい範囲に調整することが困難になる。上記観点から、無機粒子の含有量を１０〜４５重量％とすることが好ましく、１５〜３５重量％とすることがより好ましい。 Further, when the content of the inorganic particles is less than 8% by weight, the slip resistance of the formed top coat layer cannot be sufficiently obtained, and when it is more than 50% by weight, the viscosity of the coating composition and the like are in a preferable range. It becomes difficult to adjust to. From the above viewpoint, the content of the inorganic particles is preferably 10 to 45% by weight, more preferably 15 to 35% by weight.
無機粒子の種類は、特に制限されないが、例えば、以下の表１に示すように、炭酸マグネシウム、酸化マグネシウム、水酸化マグネシウム、炭酸カルシウム、リン酸カルシウム、酸化アルミニウム（アルミナ）、タルク、酸化チタン、炭化珪素等が挙げられる。これらは、天然に存在するものを用いてもよいし、人工的に合成された合成品を用いてもよい。 The type of inorganic particles is not particularly limited, but for example, as shown in Table 1 below, magnesium carbonate, magnesium oxide, magnesium hydroxide, calcium carbonate, calcium phosphate, aluminum oxide (alumina), talc, titanium oxide, silicon carbide. And so on. As these, naturally occurring ones may be used, or artificially synthesized synthetic products may be used.
無機粒子は、屈折率が１．４〜１．８程度であることが好ましい。無機粒子の屈折率を上記範囲とすることで、ニトロセルロースや光硬化性樹脂組成物により形成される乾燥塗膜又は硬化膜の屈折率と無機粒子の屈折率が近似する結果、塗料組成物により形成されるトップコート層の透明性を確保できる。これにより、トップコート層の下層に印刷層を形成する場合においても、印刷層のデザイン性や視認性等が損なわれることがない。 The inorganic particles preferably have a refractive index of about 1.4 to 1.8. By setting the refractive index of the inorganic particles within the above range, the refractive index of the dry coating film or cured film formed of nitrocellulose or the photocurable resin composition is approximated by the refractive index of the inorganic particles. The transparency of the formed top coat layer can be ensured. As a result, even when the print layer is formed under the top coat layer, the design and visibility of the print layer are not impaired.
無機粒子は、モース硬度が４以下であることが好ましい。例えば、オフセット印刷機を用いて塗料組成物の塗装を行う場合に、オフセット印刷機に用いられるローラーには鉄製の部材が用いられるが、鉄のモース硬度は４〜５程度であるため、設備保全の観点から、無機粒子のモース硬度を上記範囲とすることが好ましい。 The inorganic particles preferably have a Mohs hardness of 4 or less. For example, when painting a paint composition using an offset printing machine, an iron member is used for the rollers used in the offset printing machine, but since the Mohs hardness of iron is about 4 to 5, equipment maintenance From the viewpoint of the above, it is preferable that the Mohs hardness of the inorganic particles is in the above range.
上記説明した塗料組成物は、ニトロセルロースラッカー又は光硬化性樹脂組成物と無機粒子を配合して混合し、均一化することにより得られる。なお、無機粒子が塗料組成物中で沈降し分離することを防止するため、塗装の直前に上記配合等を行うことが好ましい。 The coating composition described above can be obtained by blending and mixing inorganic particles with a nitrocellulose lacquer or a photocurable resin composition and homogenizing them. In addition, in order to prevent the inorganic particles from settling and separating in the coating composition, it is preferable to carry out the above formulation immediately before coating.
＜鉛筆の製造方法＞
上記塗料組成物を用いた鉛筆の製造方法は、下地処理工程と、必要により中塗り工程及び／又は印刷工程と、上記塗料組成物を鉛筆軸表面に塗装する塗装工程と、を含む。その後、乾燥又は紫外線等の光照射を行い、鉛筆軸表面にトップコート層を形成する。
下地処理工程は、製軸した木材又は合成木材製の鉛筆軸の表面を、目止剤で塗装して平滑にする工程である。目止剤としては、特に制限されず、従来のシーラーや水性目止剤等を適宜用いることができる。塗装方法としても、しごき塗装法等の従来通りの方法を用いることができる。
<Pencil manufacturing method>
A method for producing a pencil using the above-mentioned coating composition includes a base treatment step,, if necessary, an intermediate coating step and / or a printing step, and a coating step of applying the above-mentioned coating composition to the surface of a pencil shaft. After that, it is dried or irradiated with light such as ultraviolet rays to form a top coat layer on the surface of the pencil shaft.
The base treatment step is a step of painting the surface of a pencil shaft made of made wood or synthetic wood with a sealant to make it smooth. The sealant is not particularly limited, and a conventional sealer, an aqueous sealant, or the like can be appropriately used. As the painting method, a conventional method such as an ironing painting method can be used.
中塗り工程は、下地処理後の鉛筆軸表面をさらに塗装してより平滑にする工程であり、ここで色彩を施してもよい。中塗り用塗料としては、特に制限されず、従来公知のエナメル塗料やクリア塗料等を適宜用いることができる。塗装方法もしごき塗装法等の従来通りの方法を用いることができる。
印刷工程は、鉛筆の用途に応じて鉛筆軸表面に絵柄や文字等を印刷する工程である。印刷方法としては特に制限されないが、例えばドライオフセット印刷法によりゴム版に各色のＵＶインキを載せ、ブランケットに転写し、鉛筆を回転させながら鉛筆軸の周面にブランケットを押し付けて印刷し、紫外線を照射して印刷されたＵＶインキを硬化させる方法が挙げられる。
The intermediate coating step is a step of further painting the surface of the pencil shaft after the base treatment to make it smoother, and coloring may be applied here. The intermediate coating paint is not particularly limited, and conventionally known enamel paints, clear paints, and the like can be appropriately used. Painting method Conventional methods such as the ironing painting method can be used.
The printing process is a process of printing a pattern, characters, or the like on the surface of a pencil shaft according to the purpose of the pencil. The printing method is not particularly limited, but for example, UV ink of each color is placed on a rubber plate by a dry offset printing method, transferred to a blanket, and the blanket is pressed against the peripheral surface of the pencil shaft while rotating the pencil to print, and ultraviolet rays are emitted. Examples thereof include a method of irradiating and curing the printed UV ink.
（塗装工程）
塗装工程は、上記下地処理がされ、必要に応じて中塗りや印刷がされた鉛筆軸表面に、上記塗料組成物を用いて塗装を行う工程である。本実施形態において、樹脂成分としてニトロセルロースラッカーが含まれる上記塗料組成物を用いて塗装を行う場合、しごき塗装法により塗装を行うことが好ましい。また、樹脂成分として光硬化性樹脂組成物が含まれる上記塗料組成物を用いて塗装を行う場合、オフセット印刷法により塗装を行うことが好ましい。
(Painting process)
The painting step is a step of painting the surface of the pencil shaft, which has been subjected to the above-mentioned base treatment and, if necessary, intermediate-coated or printed, using the above-mentioned coating composition. In the present embodiment, when coating is performed using the above coating composition containing nitrocellulose lacquer as a resin component, it is preferable to perform coating by an ironing coating method. Further, when painting is performed using the above coating composition containing a photocurable resin composition as a resin component, it is preferable to perform painting by an offset printing method.
しごき塗装法は、鉛筆を塗料の入った容器内に通し、容器を通過した鉛筆軸の周囲に付着した余剰の塗料をしごきゴムダイスにより除去する塗装方法である。しごき塗装法により、毎分２５０〜３００本程度の速度で塗装を行うことができる。また、樹脂成分としてニトロセルロースラッカーが含まれる塗料組成物を用いた場合、例えば６０℃程度で２０秒〜３０秒程度の乾燥条件で乾燥塗膜を形成できる。 The ironing coating method is a coating method in which a pencil is passed through a container containing paint and excess paint adhering to the periphery of the pencil shaft that has passed through the container is removed with an ironing rubber die. By the ironing coating method, coating can be performed at a speed of about 250 to 300 sheets per minute. Further, when a coating composition containing a nitrocellulose lacquer is used as a resin component, a dry coating film can be formed under drying conditions of, for example, about 60 ° C. for about 20 to 30 seconds.
オフセット印刷法は、前述の印刷工程における方法と同様のドライオフセット印刷法であり、例えば樹脂成分として光硬化性樹脂組成物が含まれる塗料組成物をブランケットに転写し、鉛筆を回転させながら鉛筆軸の表面にブランケットを押し付けて塗料組成物を塗装する方法であり、その後紫外線を照射して硬化膜を形成できる。ドライオフセット印刷法においても、通常は数秒〜数十秒で硬化膜を形成できる。 The offset printing method is a dry offset printing method similar to the method in the above-mentioned printing process. For example, a coating composition containing a photocurable resin composition as a resin component is transferred to a blanket, and a pencil shaft is rotated while rotating the pencil. This is a method of applying a coating composition by pressing a blanket against the surface of the surface, and then irradiating with ultraviolet rays to form a cured film. Even in the dry offset printing method, a cured film can usually be formed in several seconds to several tens of seconds.
上記しごき塗装法又はオフセット印刷法による塗装方法は、いずれも短時間で鉛筆軸表面に乾燥塗膜又は硬化膜としてのトップコート層を形成できる。そのため、短時間でトップコート層を形成できると共に、塗装された塗料のレベリングが発生する前にトップコート層を形成でき、表面に好ましい凸部が形成されたトップコート層を形成できると考えられる。 In both of the above-mentioned ironing coating method and offset printing method, a top coat layer as a dry coating film or a cured film can be formed on the surface of the pencil shaft in a short time. Therefore, it is considered that the top coat layer can be formed in a short time, the top coat layer can be formed before the leveling of the painted paint occurs, and the top coat layer having preferable convex portions on the surface can be formed.
上記鉛筆の製造方法により製造される鉛筆軸表面には、目止剤により形成された下地処理層、必要により中塗り層及び／又は絵柄や文字等が印刷された印刷層、上記塗料組成物により形成されたトップコート層からなる２層以上の層が形成される。 On the surface of the pencil shaft manufactured by the above-mentioned pencil manufacturing method, a base treatment layer formed by a sealant, an intermediate coating layer if necessary, and / or a printing layer on which a pattern, characters, etc. are printed, and the above-mentioned coating composition are used. Two or more layers composed of the formed top coat layer are formed.
なお、本発明は上記実施形態に限定されるものではなく、本発明の目的を達成できる範囲内での変形、改良は本発明に含まれる。 The present invention is not limited to the above embodiment, and modifications and improvements within the range in which the object of the present invention can be achieved are included in the present invention.
以下、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例によって限定されるものではない。 Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples.
表２に示した配合量で、樹脂成分及び粒子成分を配合し、実施例１〜１６、比較例１〜８の塗料組成物を得た。なお、表２中に示す「重量％」とは、各塗料組成物により形成される乾燥塗膜又は硬化膜中の重量％を示す。 The resin component and the particle component were blended in the blending amounts shown in Table 2 to obtain the coating compositions of Examples 1 to 16 and Comparative Examples 1 to 8. The "% by weight" shown in Table 2 indicates the% by weight in the dry coating film or the cured film formed by each coating composition.
表２中の各樹脂成分として、以下の原料を使用した。
・エポキシ（エポキシ樹脂）：シンクロコート＃５０００、＃３０ （アイレジン社製）
（配合比［シンクロコート＃５０００：＃３０］＝［６８．２：２０．５］）
・アクリルウレタン（アクリルウレタン樹脂）：Ａ−９クリヤー、Ａ−９ （アイレジン社製）
（配合比［Ａ−９クリヤー：Ａ−９］＝［６０．４：３０．２］）
・スクリーン印刷用インク（オレフィン系塗料）：ＰＯＰ’Ｎ （永瀬スクリーン印刷研究所社製）
The following raw materials were used as each resin component in Table 2.
-Epoxy (epoxy resin): Synchro Coat # 5000, # 30 (manufactured by Eye Resin)
(Mixing ratio [Synchrocoat # 5000: # 30] = [68.2: 20.5])
-Acrylic urethane (acrylic urethane resin): A-9 clear, A-9 (manufactured by Eye Resin)
(Mixing ratio [A-9 clear: A-9] = [60.4: 30.2])
-Screen printing ink (olefin paint): POP'N (manufactured by Nagase Screen Printing Laboratory)
次に、上記実施例１〜１６及び比較例１〜８の塗料組成物を用いて、それぞれ以下に示す方法で鉛筆軸への塗装及び乾燥（硬化）を行い、評価用のサンプルを作成した。 Next, using the coating compositions of Examples 1 to 16 and Comparative Examples 1 to 8, the pencil shaft was coated and dried (cured) by the methods shown below, respectively, to prepare a sample for evaluation.
［下地処理及び中塗り］
木材（樹種：インセンスシダー）製、六角軸（軸径約８ｍｍ、長さ約１８０ｍｍ）の鉛筆軸表面にシーラーをしごき塗装法により塗装し、乾燥して下地処理層を形成した上に、エナメル塗料及びクリア塗料をしごき塗装法により順次塗装・乾燥して中塗り層を形成した。
［塗装方法］
（実施例１〜６、比較例１〜４）
上記実施例及び比較例の塗料組成物を、上記下地処理及び中塗り層を形成した鉛筆軸表面にしごき塗装法により塗装してサンプルを作成した。鉛筆を各塗料組成物の入った容器内に通し、容器を通過した鉛筆軸の周囲に付着した余剰の塗料を鉛筆軸形状にあわせたしごきゴムにより除去して、毎分２５０〜３００本程度の速度で塗装を行った。
（実施例７〜１６、比較例５〜８）
上記実施例及び比較例の塗料組成物を、上記下地処理及び中塗り層を形成した鉛筆軸表面にオフセット印刷法により塗装した。具体的には、鉛筆軸表面全部を覆うベタ版を使用して塗料組成物を塗装した。
[Base treatment and intermediate coating]
A sealer is applied to the surface of a pencil shaft made of wood (tree species: insense cedar) and a hexagonal shaft (shaft diameter of about 8 mm, length of about 180 mm) by an ironing method, and dried to form a base treatment layer, and then enamel. The paint and the clear paint were sequentially painted and dried by the ironing method to form an intermediate coating layer.
[Painting method]
(Examples 1 to 6, Comparative Examples 1 to 4)
The coating compositions of the above-mentioned Examples and Comparative Examples were applied to the surface of the pencil shaft on which the above-mentioned base treatment and the intermediate coating layer were formed by an ironing coating method to prepare a sample. Pass the pencil through the container containing each paint composition, remove the excess paint adhering around the pencil shaft that has passed through the container with a squeezing rubber that matches the shape of the pencil shaft, and remove about 250 to 300 pencils per minute. Painting was done at speed.
(Examples 7 to 16, Comparative Examples 5 to 8)
The coating compositions of the above Examples and Comparative Examples were coated on the surface of the pencil shaft on which the above-mentioned base treatment and the intermediate coating layer were formed by an offset printing method. Specifically, the paint composition was painted using a solid plate covering the entire surface of the pencil shaft.
［乾燥（硬化）方法］
（実施例１、３〜１６、比較例４〜８）
上記実施例及び比較例の塗料が塗装されたサンプルに対し、ＵＶを照射して表面を硬化させた。ＵＶ照射条件は積算光量５３０ｍＪ／ｃｍ２、炉内温度１００℃とした。
（実施例２、比較例１〜３）
上記実施例及び比較例の塗料が塗装されたサンプルを、以下の条件で乾燥させた。
・実施例２：２０℃、９０秒
・比較例１：２０℃、２２時間
・比較例２：２０℃、５時間
・比較例３：２０℃、２４時間
[Drying (curing) method]
(Examples 1, 3 to 16, Comparative Examples 4 to 8)
The samples coated with the paints of the above Examples and Comparative Examples were irradiated with UV to cure the surfaces. The UV irradiation conditions were an integrated light intensity of 530 mJ / cm 2 and a furnace temperature of 100 ° C.
(Example 2, Comparative Examples 1 to 3)
The samples coated with the paints of the above Examples and Comparative Examples were dried under the following conditions.
-Example 2: 20 ° C., 90 seconds-Comparative example 1: 20 ° C., 22 hours-Comparative example 2: 20 ° C., 5 hours-Comparative example 3: 20 ° C., 24 hours
上記実施例及び比較例の塗料組成物によりトップコート層を形成したサンプルを、１日以上養生したのち指触し、以下の基準によりそれぞれ評価を行った。結果を表３に示す。 Samples having a topcoat layer formed by the coating compositions of the above Examples and Comparative Examples were cured for 1 day or more, then touched and evaluated according to the following criteria. The results are shown in Table 3.
《滑りにくさ》
鉛筆軸を指触した際の滑りにくさについて、以下の基準により５段階の評価を行い、最も優れたものを「５」とし、「３」以上の評価を合格と判定した。
５：握るとしっかりしたグリップ感あり
４：握るとある程度のグリップ感あり
３：握るとややグリップ感あり
２：握ってもほとんどグリップ感なし
１：握っても滑り、グリップ感全くなし
《Difficulty in slipping》
The difficulty of slipping when the pencil shaft was touched was evaluated on a five-point scale according to the following criteria, the most excellent one was rated as "5", and the rating of "3" or higher was judged to be acceptable.
5: There is a firm grip when gripping 4: There is a certain grip feeling when gripping 3: There is a slight grip feeling when gripping 2: There is almost no grip feeling when gripping 1: There is no slipping feeling even when gripping, no grip feeling at all
《サラサラ感》
鉛筆軸を指触した際のサラサラ感について、以下の基準により５段階の評価を行い、最も優れたものを「５」とし、「３」以上の評価を合格と判定した。
５：サラサラとした感触
４：ややサラサラとした感触
３：どちらともいえない感触
２：ややベタベタとした感触
１：ベタベタとした感触
《Smooth feeling》
The smooth feeling when the pencil shaft was touched was evaluated on a 5-point scale according to the following criteria, the most excellent one was rated as "5", and the evaluation of "3" or higher was judged to be acceptable.
5: Smooth feel 4: Slightly smooth feel 3: Neither feel 2: Slightly sticky feel 1: Sticky feel
《凹凸感》
鉛筆軸を指触した際の凹凸感について、以下の基準により５段階の評価を行い、最も優れたものを「３」とし、「２」「３」「４」を合格と判定した。
５：ごつごつとして、凹凸感が強すぎる
４：かなり凹凸感が感じられる
３：適度に凹凸感が感じられる
２：少し凹凸感が感じられる
１：ツルツルとして、凹凸感が感じられない
《Unevenness》
The unevenness when the pencil shaft was touched was evaluated on a five-point scale according to the following criteria, and the most excellent one was rated as "3", and "2", "3", and "4" were judged to be acceptable.
5: It is rugged and the unevenness is too strong 4: It feels quite uneven 3: It feels moderately uneven 2: It feels a little uneven 1: It feels smooth and uneven
実施例及び比較例の塗料組成物の塗工性及び、形成されたトップコート層の透明性について以下の基準により評価を行った。結果を表３に示す。
《透明性》
トップコート層の透明性について、目視観察し、トップコート層の下の層（中塗り層）の色彩が見えやすいものを〇、見えにくいものを×、と評価した。
《塗工性》
塗工性について、乾燥時間、ポットライフ、トップコート層のべた付き等の観点から良好であるものを〇、不適であるものを×、と評価した。
The coatability of the coating compositions of Examples and Comparative Examples and the transparency of the formed top coat layer were evaluated according to the following criteria. The results are shown in Table 3.
"transparency"
The transparency of the topcoat layer was visually observed, and those in which the color of the layer below the topcoat layer (intermediate coating layer) was easily visible were evaluated as ◯, and those in which it was difficult to see were evaluated as ×.
《Paintability》
Regarding the coatability, those that were good in terms of drying time, pot life, stickiness of the top coat layer, etc. were evaluated as 〇, and those that were unsuitable were evaluated as ×.
表３に示す通り、無機粒子を含有する実施例１〜１６の塗料組成物により形成されたトップコート層を有する鉛筆は、無機粒子を含有しない比較例５、６の塗料組成物により形成されたトップコート層を有する鉛筆と比較して、凹凸感が感じられ滑りにくい指触が得られることが確認された。 As shown in Table 3, the pencil having the top coat layer formed by the coating compositions of Examples 1 to 16 containing inorganic particles was formed by the coating compositions of Comparative Examples 5 and 6 containing no inorganic particles. It was confirmed that a feeling of unevenness was felt and a non-slip touch was obtained as compared with a pencil having a top coat layer.
表３に示す通り、無機粒子を含有する、ニトロセルロースラッカー又は光硬化性樹脂組成物からなる実施例１〜１６の塗料組成物は、ニトロセルロースラッカー又は光硬化性樹脂組成物を含有しない比較例１〜３の塗料組成物と比較して、塗工性に優れることが確認された。またべた付きが少ないトップコート層を形成できることが確認された。 As shown in Table 3, the coating compositions of Examples 1 to 16 comprising a nitrocellulose lacquer or a photocurable resin composition containing inorganic particles are Comparative Examples not containing the nitrocellulose lacquer or the photocurable resin composition. It was confirmed that the coatability was excellent as compared with the coating compositions 1 to 3. It was also confirmed that a top coat layer with less stickiness could be formed.
表３に示す通り、粒子径が１〜３０μｍの無機粒子を含有する実施例１〜１６の塗料組成物により形成されたトップコート層を有する鉛筆は、粒子径が上記範囲外である比較例４の塗料組成物により形成されたトップコート層を有する鉛筆と比較して、凹凸感が感じられ滑りにくい指触が得られることが確認された。 As shown in Table 3, a pencil having a top coat layer formed by the coating composition of Examples 1 to 16 containing inorganic particles having a particle size of 1 to 30 μm has a particle size outside the above range, Comparative Example 4. It was confirmed that a feeling of unevenness was felt and a non-slip touch was obtained as compared with a pencil having a top coat layer formed by the coating composition of.
表３に示す通り、無機粒子が乾燥重量比で８〜５０重量％含有される実施例１〜１６の塗料組成物により形成されたトップコート層を有する鉛筆は、無機粒子の含有量が上記範囲外である比較例７、８の塗料組成物により形成されたトップコート層を有する鉛筆と比較して、滑りにくい指触が得られることが確認された。 As shown in Table 3, pencils having a topcoat layer formed by the coating compositions of Examples 1 to 16 containing 8 to 50% by weight of inorganic particles in a dry weight ratio have an inorganic particle content in the above range. It was confirmed that a non-slip touch was obtained as compared with a pencil having a top coat layer formed by the coating compositions of Comparative Examples 7 and 8 outside.
Claims (4)
前記無機粒子は、粒子径が１〜３０μｍであり、乾燥重量比で８〜５０重量％含有される、鉛筆トップコート用塗料組成物。 Consisting of a nitrocellulose lacquer or photocurable resin composition containing inorganic particles
The inorganic particles have a particle size of 1 to 30 μm and are contained in an amount of 8 to 50% by weight based on a dry weight, which is a coating composition for a pencil top coat.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002544012A (en) * | 1999-05-07 | 2002-12-24 | アー ヴェー ファーバー‐カステル ウンターネーメンスフェルヴァルツング ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニ | Wooden pencil for writing, coloring, drafting and makeup |
| US6837637B1 (en) * | 2003-09-12 | 2005-01-04 | Faber-Castell Ag | Wood-encased pencil for writing, sketching, drawing, and cosmetic purposes |
| JP2005111740A (en) * | 2003-10-06 | 2005-04-28 | Nakano:Kk | Dry lacquer tone pencil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002544012A (en) * | 1999-05-07 | 2002-12-24 | アー ヴェー ファーバー‐カステル ウンターネーメンスフェルヴァルツング ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニ | Wooden pencil for writing, coloring, drafting and makeup |
| US6837637B1 (en) * | 2003-09-12 | 2005-01-04 | Faber-Castell Ag | Wood-encased pencil for writing, sketching, drawing, and cosmetic purposes |
| JP2005111740A (en) * | 2003-10-06 | 2005-04-28 | Nakano:Kk | Dry lacquer tone pencil |
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