Coated pearlescent pigments with SiO2 and cerium oxide

  • US 7,413,599 B2
  • Filed: 08/26/2005
  • Issued: 08/19/2008
  • Est. Priority Date: 08/26/2004
  • Status: Active Grant
First Claim
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1. A pearlescent pigment with a platelet-shaped substrate comprising metal oxide and having a first and a second protective layer, said metal oxide having a refractive index of greater than 1.8, there being on the platelet-shaped substrate a first protective layer comprising cerium oxide, cerium hydroxide, or a mixture thereof anda second protective layer of SiO2, applied to which is an organic chemical aftercoat comprising at least one silane having at least one functional bond group and at least one silane without a functional bond group, it being possible for metal oxide layers other than cerium oxide and SiO2 to be disposed between the first and the second protective layer, wherein the silane without a functional bond group is an alkylsilane having the structural formula (I):


  • R(4-z)Si(X)z



    (I)wherez is an integer from 1 to 3;

    R is a substituted or unsubstituted, unbranched or branched alkyl chain having 10 to 22 carbon atoms, andX is a halogen and/or alkoxy group, orwherein the silane without a functional bond group has the structural formula (II);


    (R1

    X-[A-Y]n

    B)(4-z)Si(OR2)z



    (II)wheren=1 to 100;

    z is an integer from 1 to 3;

    R1 is a straight- or branched-chain alkyl having 1 to 12 carbon atoms, which may be substituted by halogens;

    an aryl having 6 to 12 carbon atoms;

    or an aryl having 6 to 12 carbon atoms, which is substituted by alkyl having 1 to 6 carbon atoms, halogen atoms, or a combination thereof;

    R2 is straight or branched-chain alkyl having 1 to 6 carbon atoms;

    A and B independently of one another are a divalent group consisting of straight- or branched-chain alkylene having 1 to 12 carbon atoms;

    an arylene having 6 to 12 carbon atoms;

    or an arylene having 6 to 12 carbon atoms, which is substituted by alkyl having 1 to 6 carbon atoms, halogen atoms, or a combination thereof; and

    X and Y independently of one another are O or S.

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