Patent ID: 7988881
Filing Date: 2011-08-02
Classification: B32B,C09K,Y10T

Abstract:
1. A multilayer laminate article for reflecting radiation having a wavelength in the range of 280 to 2500 nm, said article comprising: (a) at least one layer comprising a nonmicellar twisted nematic liquid crystal having cholesteric infrared-reflecting properties; and (b) at least one layer comprising a polymeric sheet; wherein, optionally, said at least one layer of said nonmicellar twisted nematic liquid crystal is in contact with said at least one layer of said polymer sheet; said nonmicellar twisted nematic liquid crystal comprising a compound of formula (I): wherein D is a chiral moiety (D1) or (D2) derived, by formal removal of a hydroxyl group, from the alkaloids selected from the group consisting of (−)-cinchonidine, CAS [485-71-2]; (+)-cinchonine, CAS [118-10-5]; quinine, CAS [130-95-0] and quinidine, CAS [56-54-2]; and their dihydro-derivatives: X is hydrogen or —OCH R is —CH═CH S S R each B is a divalent radical independently selected from the group consisting of aliphatic and aromatic carbocyclic and heterocyclic groups having 1 to 16 carbon atoms; optionally having one or more fused rings and optionally mono- or polysubstituted with L; L is selected from the group consisting of the substituents F, Cl, —CN, and —NO A R m is an integer of 1 or 2; and n is an integer of 0 or 1.