Plate-like PVD aluminum pigment with a protective encapsulation and method for manufacturing a plate-like PVD aluminium pigment with a protective encapsulation

An encapsulated pigment comprising a plate-like PVD aluminum pigment and a protective encapsulation disposed on the PVD aluminum pigment, wherein the protective encapsulation comprises:

• a continuous encapsulating silicon oxide containing coating consisting of a mixture of silicon oxide and an organofunctional silane having formula (I) acting as a network modifier
• R(4−z)Si(X)z (I)
• wherein, z is an integer from 1 to 3, R comprises one or more of an unsubstituted, unbranched or branched alkyl chain having 1 to 24 C atoms, an aryl group having 6 to 18 C atoms, and an arylalkyl group having 7 to 25 C atoms, and X comprises one or more of a halogen group and an alkoxy group, and the silicon oxide containing coating amounts to 8 wt.-% to 25 wt.-%, based on the weight of the uncoated PVD aluminum pigment,
• a layer of metal oxide, wherein the metal oxide includes one or more of molybdenum oxide, molybdenum hydroxide, molybdenum oxide hydrate, tungsten oxide, tungsten hydroxide, and tungsten oxide hydrate, and the metal oxide includes 0.01 to 0.4 wt.-% molybdenum or 0.01 to 0.8 wt.-% tungsten, calculated as elemental molybdenum or elemental tungsten and based on the weight of the uncoated PVD aluminum pigment, the layer of metal oxide being directly applied to the PVD pigment;
• and
• wherein the silicon oxide coating consists of a hybrid coating consisting of a mixture of silicon oxide and a silane, the silane consisting of phenyltrimethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, or diphenyldiethoxysilane, the silane acting as a network modifier distributed throughout the hybrid coating.

An encapsulated pigment comprising a plate-like PVD aluminum pigment and a protective encapsulation disposed on the PVD aluminum pigment, wherein the protective encapsulation comprises the following layers:

• a continuous encapsulating silicon oxide containing coating, wherein the coating is a hybrid coating consisting of a mixture of silicon oxide and an organofunctional silane having formula (I) acting as a network modifier distributed throughout the hybrid coating
• R(4−z)Si(X)z (I)
• wherein, z is an integer from 1 to 3, R comprises one or more of an unsubstituted, unbranched or branched alkyl chain having 1 to 24 C atoms, an aryl group having 6 to 18 C atoms, and an arylalkyl group having 7 to 25 C atoms, and X comprises one or more of a halogen group and an alkoxy group, and the silicon oxide containing coating amounts to 8 wt.-% to 25 wt.-%, based on the weight of the uncoated PVD aluminum pigment,
• a layer of metal oxide, wherein the metal oxide includes one or more of molybdenum oxide, molybdenum hydroxide, molybdenum oxide hydrate, tungsten oxide, tungsten hydroxide, and tungsten oxide hydrate, and the metal oxide includes 0.01 to 0.4 wt.-% molybdenum or 0.01 to 0.8 wt.-% tungsten, calculated as elemental molybdenum or elemental tungsten and based on the weight of the uncoated PVD aluminum pigment, and
• optionally an outer organic-chemical modification layer comprising at least one organofunctional silane.