Pigment flakes

A polymerizable compound of formula I*

• P—(Sp—X)n—CG—R I*
• wherein
• P is a polymerizable group,
• Sp is a spacer group having 1 to 20 C atoms,
• X is —O—, —S—, —CO—, —COO—, —OCO—, —O—COO—, —SO2—O—, —O—SO2— or a single bond,
• n is 0 or 1, and
• R is H or an alkyl radical with 1 to 25 C atoms which is optionally unsubstituted, mono- to perhalo-substituted by halogen or CN, and, optionally, one or more non-adjacent CH2 groups being replaced, in each case independently from one another, by —O—, —S—, —NH—, —N(CH3)—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S— or —C≡C— in such a manner that oxygen atoms are not linked directly to one another, or alternatively R is halogen, cyano or has independently one of the meanings given for P—(Sp—X)n—,
• and
• CG is a chromophoric group or a fluorescent chromophoric group of the following formula
• —(A1—Z1)c—Ch—(Z1—A1)d— III
• wherein
• A1 is 1,4-phenylene in which, optionally, one or more CH groups are replaced by N, 1,4-cyclohexylene in which, optionally, one or two non-adjacent CH2 groups are replaced by O and/or S, 1,4-cyclohexenylene or naphthalene-2, 6-diyl, optionally all of these groups being unsubstituted, mono- or polysubstituted with halogen, cyano or nitro groups or alkyl, alkoxy or alkanoyl groups having 1 to 7 C atoms wherein one or more H atoms may be substituted by F or Cl,
• Z1 is —O—, —CO—, —COO—, —OCO—, —SO2—O—, —O—SO2—, —CH2CH2—, —OCH2—, —CH2O—, —CH=CH—, —C≡C—, —CH=CH—COO—, —OCO—CH=CH— or a single bond, c and d are 0, 1 or 2, and
• Ch is a chromophore or fluorescent chromophore, which can optionally be chiral and/or mesogenic, and is denoted by one of the following groups, optionally all of these groups being unsubstituted, mono- or polysubstituted with halogen, cyano or nitro groups or alkyl, alkoxy or alkanoyl groups having 1 to 7 C atoms wherein one or more H atoms are optionally substituted by F or Cl:
• 5-(p-dimethylaminobenzylidene)-rhodanine,
• a thionine-containing group,
• 1,4-diphenyl-1, 3-butadiene,
• 1,6-diphenyl-1,3,5-hexatriene,
• indigotine,
• indigocarmine,
• an oxazole-containing group,
• an azo dye,
• an anthraquinone-containing group,
• a fluorescein-containing group,
• a 2,5-dihydropyrrolo[3,4-c]pyrrole-1, 4-dione-containing group,
• a perylene-containing group,
• a benzimidazole-containing group,
• a benzoxazole-containing group,
• a stilbene-containing group,
• a polyphenylene-containing group,
• a spiro group-containing polyphenylene-containing group, or
• a dye comprising at least one cholesteryl group, provided that:
• when Ch is an azo dye, an anthraquinone-containing group, a perylene-containing group, or a stilbene-containing group, R is P—(Sp—X)n—.