JP2019048983A - 磁性又は磁化可能顔料粒子及び視覚効果層 - Google Patents
磁性又は磁化可能顔料粒子及び視覚効果層 Download PDFInfo
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Abstract
Description
[001]本発明は、非球状磁性又は磁化可能顔料粒子及びにそうした顔料粒子を含み、視覚効果層(OEL)を生成するためのコーティング組成物の分野に関し、この場合、磁性又は磁化可能顔料粒子は磁場配向している。特に、本発明は、セキュリティ文書又はセキュリティ物品に対する偽造防止手段としての上記OELの使用を提供する。加えて、又は、代わりに、OELはまた、装飾の目的で使用されてもよい。
[002]当該技術分野において、例えば、セキュリティ文書の分野におけるセキュリティ要素の生成のために配向型磁性若しくは磁化可能顔料粒子、特に、光学的可変性の磁性若しくは磁化可能顔料粒子も含むインク、組成物、コーティング又は層を使用することが公知である。配向型磁性若しくは磁化可能顔料粒子を含むコーティング又は層は、例えば、米国特許第2,570,856号;米国特許第3,676,273号;米国特許第3,791,864号;米国特許第5,630,877号及び米国特許第5,364,689号に開示されている。特に魅力的なセキュリティ文書の保護に有用な視覚効果をもたらす配向型磁性カラーシフト顔料粒子を含むコーティング又は層が、国際公開第2002/090002A2号及び国際公開第2005/002866A1号において開示された。
[013]したがって、本発明の目的は、上記のとおりの先行技術の欠陥を克服することである。この目的は、コバルト、鉄、ガドリニウム及びニッケルからなる群から選択される磁性金属;鉄、マンガン、コバルト、ニッケル若しくはそれらの2つ以上の混合物の磁性合金;クロム、マンガン、コバルト、鉄、ニッケル若しくはそれらの2つ以上の混合物の磁性酸化物;又はそれらの2つ以上の混合物を含み、6μm超で13μm未満、好ましくは約7μm〜約10μmのd50値を有する非球状磁性又は磁化可能顔料粒子の提供によって達成される。
a)基材表面上又は磁場発生装置の支持面上に、第1の状態の本明細書に記載のコーティング組成物を塗布するステップと、
b)第1の状態のコーティング組成物を磁場発生装置の磁場に曝露して、それにより、本明細書に記載の非球状磁性又は磁化可能顔料粒子の少なくとも一部を配向させるステップと、
c)コーティング組成物を第2の状態に固めて、非球状磁性又は磁化可能顔料粒子を選ばれた位置及び配向で固定するステップと
を含む。
[019]ここで、本発明による非球状磁性又は磁化可能顔料粒子及び上記顔料粒子を含むOELを、図面及び特定の実施形態を参照してより詳細に記載する。
定義
[020]明細書で述べ、請求項で挙げた用語の意味を解釈するために以下の定義が使用される。
D(v,50)(以降d50と略記する)は、マイクロメートル単位のCE径の値であり、PSDを累積体積が等しい以下の2つの部分に分ける:下側部分が、全粒子の累積体積の50%であり、d50よりも小さなCE径の粒子に対応し;上側部分が、粒子の累積体積の50%であり、d50よりも大きなCE径の粒子に対応する。d50は、粒子の体積分布の中央値としても公知である。
D(v,90)(以降d90と略記する)は、マイクロメートル単位のCE径の値であり、PSDを累積体積が異なる以下の2つの部分になるよう分ける。下側部分が、全粒子の累積体積の90%であり、d90よりも小さなCE径の粒子に対応し、上側部分が、粒子の累積体積の10%であり、CE径がd90よりも大きい。
同様に、D(v,10)(以降d10と略記する)は、マイクロメートル単位のCE径の値であり、PSDを累積体積が異なる以下の2つの部分になるよう分ける。下側部分が、全粒子の累積体積の10%であり、d10よりも小さなCE径の粒子に対応し、上側部分が、粒子の累積体積の90%であり、CE径がd10よりも大きい。
1)OELの色と対比して視覚効果層内にある明るい輝く点の存在により識別できる不完全な整列。この点は、図1Aと、それ程ではないにせよ図1Bに確認できるのに対して、図1C〜1Fは、(dと標識されている)色の濃い領域に明るい点は示されていない。この現象は、主にPSDに存在する小さな割合の極端に大きな粒子が関係し、d90値によって最も良く説明されている。したがって、本発明に対して適切な非球状磁性又は磁化可能顔料粒子は、好ましくは20μm未満、好ましくは約15μm以下のd90値を有する。
2)画像細部の粒状性及び低解像度。図2A〜2Fに示されるとおり、図2A及び2Bは、はっきりとわかる粒状性を示しており、50のしるしも図2C〜2Fほど十分に輪郭が示されていない。上記のポイント1)とは対照的に、ここでは、解像度及び/又は読みやすさに悪影響を与える反射性の「粒」が明るい領域、特に、50のしるしの輪郭を定めている領域に本質的に存在する。粒状性及び低解像度は、わずかにある最大の粒子だけでなく、PSDの最もよくある粒子径のサイズ、すなわち、d50値の影響も受ける。したがって、本発明に対して適切な非球状磁性又は磁化可能顔料粒子は、13μm未満、好ましくは約10μm以下のd50値を有さなければならない。
3)図1A〜1Fに示されるとおり、明るい領域の反射率(標識b)も粒子径の影響を受ける。この場合、顔料粒子のサイズが大きいほど、当該技術分野において教示されているとおり、最良の反射率が得られ、一般的な傾向は、サイズが小さくなるにつれ中心の「明るい領域」の明度が低下する。しかしながら、表2からわかるとおり、整列がおおむね良好で、サイズもまだ極端に小さくないd50=9.3μmで最適な値が得られている。付加される条件は、したがって、d50値が極端に小さくてはならない。ここで、非球状磁性又は磁化可能顔料粒子の大部分は最適な反射率を生じさせるために必要とされる。したがって、本発明に対して適切な非球状磁性又は磁化可能顔料粒子は、d50値が6μm超、好ましくは約7μm以上でなければならない。
4)最後に、上記の事例3)で述べられた極端に小さな粒径中央値(d50)は反射率を低下させることとともに、色の濃い領域においてわずかにある最大(d90)の顔料粒子の不完全な整列が、上記のポイント1)のとおり、効果の視認性又はコントラストの低下につながる可能性がある。表2に示されている得られたピクセル値及びコントラスト計算値は、15μm以下のd90値とともに、d50値がおよそ9.3μmに等しい非球状磁性又は磁化可能顔料粒子に対して最適な値が得られることを確認している。
a)基材表面又は磁場発生装置の支持面に第1の(流体)状態の本明細書に記載のコーティング組成物を塗布するステップと、
b)第1の状態のコーティング組成物を磁場発生装置の磁場に曝露して、それにより、コーティング組成物内で非球状磁性又は磁化可能顔料粒子を配向させるステップと、
c)コーティング組成物を第2の状態に固めて、非球状磁性又は磁化可能粒子を選ばれた位置及び配向で固定するステップと
を含む。
[0102]表1に記載されているコーティング組成物を、ノタメッシュ(NotaMesh)(登録商標)195メッシュのふるいを使用したKBA−ノタシスノタスクリーン(Notasys NotaScreen)(登録商標)印刷機により6000シート/時間でスクリーン印刷することによって標準的なワタベースの基材及びポリマー銀行券基材に塗布した(820×700mm、それぞれ、Papierfabrik LouisenthalからのBNP普通紙90g/m2及びSecurencyからのGuardianポリマー基材)。
Claims (15)
- コバルト、鉄、ガドリニウム及びニッケルからなる群から選択される磁性金属;鉄、マンガン、コバルト、ニッケル若しくはそれらの2つ以上の混合物の磁性合金;クロム、マンガン、コバルト、鉄、ニッケル若しくはそれらの2つ以上の混合物の磁性酸化物;又はそれらの2つ以上の混合物を含み、6μm超で13μm未満、好ましくは約7μm〜約10μmのd50値を有する非球状磁性又は磁化可能顔料粒子。
- 20μm未満、好ましくは約15μm以下のd90値とともに、6μm超で13μm未満、好ましくは約7μm〜約10μmのd50値を有する、反射性の請求項1に記載の非球状磁性又は磁化可能顔料粒子。
- 小板状顔料粒子である、請求項1又は2に記載の非球状磁性又は磁化可能顔料粒子。
- 前記非球状磁性又は磁化可能顔料粒子の少なくとも一部が、光学的可変性の非球状磁性又は磁化可能顔料粒子によって構成されており、
前記光学的可変性の非球状磁性又は磁化可能顔料粒子が、磁性薄膜干渉顔料粒子、磁性コレステリック液晶顔料粒子、磁性材料を含む干渉コーティング顔料粒子及びそれら2つの以上の組み合わせからなる群から好ましくは選択される、請求項1〜3のいずれか一項に記載の非球状磁性又は磁化可能顔料粒子。 - 前記磁性薄膜干渉顔料粒子が、吸収層/誘電層/反射層/誘電層/吸収層の5層のファブリー−ペロー型多層構造を含み、前記反射層及び/又は前記吸収層は、ニッケル、鉄及び/若しくはコバルト並びに/又はニッケル、鉄及び/若しくはコバルトを含む磁性合金並びに/又はニッケル(Ni)、鉄(Fe)及び/若しくはコバルト(Co)を含む磁性酸化物を含む磁性層である、請求項4に記載の非球状磁性又は磁化可能顔料粒子。
- 前記磁性薄膜干渉顔料粒子が、吸収層/誘電層/反射層/磁性層/反射層/誘電層/吸収層の7層のファブリー−ペロー型多層構造又は吸収層/誘電層/反射層/磁性層/誘電層/吸収層の6層のファブリー−ペロー型多層構造を含み、
前記磁性層は、ニッケル、鉄及び/若しくはコバルト;並びに/又はニッケル、鉄及び/若しくはコバルトを含む磁性合金;並びに/又はニッケル、鉄及び/若しくはコバルトを含む磁性酸化物を含む、請求項4に記載の非球状磁性又は磁化可能顔料粒子。 - 前記反射層が、独立してアルミニウム、クロム、ニッケル及びそれらの合金からなる群から選択される1つ若しくは複数でできている;並びに/又は前記誘電層が、独立してフッ化マグネシウム及び二酸化ケイ素からなる群から選択される1つ若しくは複数でできている;並びに/又は前記吸収層が、独立してクロム、ニッケル及びそれらの合金からなる群から選択される1つ若しくは複数でできている、請求項5又は6に記載の非球状磁性又は磁化可能顔料粒子。
- 視覚効果層(OEL)を生成するためのバインダー材料を含むコーティング組成物への請求項1〜7のいずれか一項に記載の非球状磁性又は磁化可能顔料粒子の使用。
- 請求項1〜7のいずれか一項に記載の非球状磁性又は磁化可能顔料粒子及びバインダー材料を含む、視覚効果層(OEL)を生成するためのコーティング組成物。
- 前記非球状磁性又は磁化可能顔料粒子が磁場配向している、固まった形態の請求項9に記載のコーティング組成物を含む、視覚効果層(OEL)。
- 視覚効果層(OEL)を生成するためのプロセスであって、
a)基材表面上又は磁場発生装置の支持面上に、第1の状態の請求項9に記載のコーティング組成物を塗布するステップと、
b)第1の状態のコーティング組成物を磁場発生装置の磁場に曝露し、それにより、前記非球状磁性又は磁化可能顔料粒子の少なくとも一部を配向させるステップと、
c)コーティング組成物を第2の状態に固めて、前記非球状磁性又は磁化可能顔料粒子を選ばれた位置及び配向で固定するステップと
を含む、プロセス。 - 固めるステップc)が、ステップb)と部分的に同時に行われる、請求項11に記載のプロセス。
- 基材上に1つ又は複数の請求項10に記載の視覚効果層を含む、視覚効果コーティングされた基材(OEC)。
- 偽造若しくは不正からのセキュリティ文書の保護のため又は装飾用途のための、請求項10に記載の視覚効果層(OEL)又は請求項13に記載の視覚効果コーティングされた基材(OEC)の使用。
- 1つ又は複数の請求項10に記載の視覚効果層(OEL)を含む、セキュリティ文書又は装飾要素若しくは物品。
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