Composite reflective flake based pigments, method for their...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/00 (2006.01) C09D 5/32 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2411893

A flake-based pigment is provided having improved specular reflectance characteristics in the visible wavelength range. The flake-based pigment has a plurality of composite reflective flakes each formed of a support layer on one or both opposing sides of the support layer. This flake structure exhibits a uniaxial compressive strength much greater than a corresponding uniaxial tensile strength. The structure of the flakes provides the benefits of rigidity and brittle fracture during manufacture and application processes, which ultimately provides favorable planar and specular reflectance characteristics to the pigment in the visible wavelength range. A variety of outer coating layers can be formed around the composite reflective flakes, such as various dielectric and/or absorber layers, to produce desired optical characteristics in the pigment. In addition is claimed, a method of fabricating the reflective flake-based pigment and a colorant composition comprising a polymeric medium and a plurity of the composite reflective flakes.

Cette invention concerne un pigment à base de paillettes qui possède des caractéristiques de réflexion spéculaire améliorées dans la plage des longueurs d'onde visibles. Le pigment à base de paillettes comporte une pluralité de paillettes composites réfléchissantes formées chacune d'une couche support, de part et d'autre de la couche support. Cette structure en paillettes présente une résistance uniaxiale à la compression beaucoup plus importante qu'une résistance uniaxiale à la traction correspondante. Elle offre les avantages de la rigidité et de la rupture fragile pendant les processus de fabrication et d'application, ce qui, en définitive, confère au pigment des caractéristiques favorables de réflexion plane et spéculaire dans la plage des longueurs d'onde visibles. Diverses couches extérieures peuvent être formées autour des paillettes composites réfléchissantes, par exemple des couches diélectriques et/ou absorbantes qui produisent les caractéristiques optiques requises dans le pigment. L'invention porte également sur un procédé de fabrication du pigment réfléchissant à base de paillettes ainsi qu'une composition colorante comprenant un support polymère et une pluralité de paillettes composites réfléchissantes.

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