Polymerizable liquid crystal material and polymerized liquid crystal film

A polymerizable liquid crystal material comprising one or more reactive mesogenic compounds, one or more chiral compounds and one or more compounds of formula I,

• wherein
• R1 denotes each and independently from another, an alkyl radical, or aryl radicals, but at least 80% of the radicals R1 are methyl radicals, and
• R2 denotes each and independently from another
• (a)
• wherein
• R3 is denotes each and independently from another a hydrogen or alkyl radical,
• R4 denotes each and independently from another is a hydrogen, alkyl or carboxyl radical
• c denotes integer from 1 to 20,
• d denotes an integer from 0 to 50, and
• e is a number from 0 to 50, or
• (b) —(CH2—)fOR5,
• in which
• R5 denotes each and independently from another hydrogen, alkyl or carboxyl radical or a dimethyl propane radical containing ether groups if desired, and
• f denotes an integer from 2 to 20, or
• (c) —(CH2—)g(OC2H4—)h(OC3H8)j(OCH2CH(C6H5))kOR6
• in which
• R6 is a hydrogen, alkyl or carboxyl radical,
• g is a number from 2 to 6,
• h is a number from 0 to 20,
• i is a number from 1 to 50,
• j is a number from 0 to 10, and
• k is a number from 0 to 10, or
• (d) correspond to the radical R1,
• with the proviso that in the average molecule at least one radical R2 has the definition (a), a is a number from 1 to 500, and b is a number from 0 to 10.