Abstract: The invention relates to bisphenyl thiocompounds of formula (I), wherein X1 to X5 independently represent H, Cl, F, OH, SH, R, —OR and —SR, wherein R is an organic radical with 1 to 18 C atoms, which can be an alkyl or alkenyl radical that can also contain —O—, —S— instead of a one to four non-adjacent CH2 groups and that can be substituted once or multiple times by —OH, —SH or halogen, an unsubstituted phenyl, cyclohexyl or cyclohexylmethyl radical or substituted by one or up to three alkyl groups with a total of 1 to 9 C atoms in which a CH2 group may be replaced by —O—, provided that at least 3 of the radicals X1 to X5 are; Y1 to Y5 independently have the meaning cited for X1 to X5 and Z represents an &agr;, &ohgr;-alkylene group with 2 to 18 C atoms in which one to three CH2 groups may be substituted by —O— or —S— and 1,4-cyclohexandimethyl group or a simple bond.