Near infrared absorbing phthalocyanines and their use
The instant invention relates to novel phthalocyanines and their use as IR-absorbers, in particular in transparent thermoplastic or crosslinkable polymers. A further aspect of the invention is a composition of these phthalocyanines and thermoplastic or crosslinkable polymers and an architectural or automotive glazing containing these phthatolcyanines.
1. A transparent or translucent composition comprising
a) a compound of formula (I)
wherein
R is hydrogen, C 1 -C 18 alkyl, C 3 -C 18 alkyl interrupted by one or more O atoms, benzyl or cyclohexyl;
R′ is hydrogen or C 1 -C 18 alkyl;
or R and R′ together with the nitrogen atom to which they are bonded form a morpholine group; and
M is Mn, Zn, V(O), Ti(O), Si, Al, Sn, Cu or Co;
which is dispersed in
b) a thermoplastic or crosslinkable polymer;
wherein the composition is in the form of a sheet or film of a thickness of less than 10 mm and at least 80% translucent in each part of visible range of 400-800 nm;
wherein the sheet or film exhibits a full solar radiation of 340-1800 nm transmittance of less than 60%,
a full visible light of 400-800 nm transmittance of more than 75% and
a haze of less than 1% as measured according to ASTM D-1003, wherein the compound of formula (I) is present in an amount from 0.01 to 10% by weight, based on the weight of the thermoplastic or crosslinkable polymer.
2. The composition according to claim 1 , wherein the thermoplastic or crosslinkable polymer comprises polycarbonate, a coating or coextruded layer on polycarbonate, polyesters, acrylics, halogenated polymers, polyolefins, aromatic homopolymers, copolymers derived from vinyl aromatic monomers, polyvinylacetales or blends, alloys or co-polymers thereof.
3. The composition according to claim 1 , wherein the thermoplastic or crosslinkable polymer comprises polycarbonate, polymethylmethacrylate, polyethyleneterephthalate, polyvinylchloride, transparent ABS, polyvinylidene fluoride, styrene-acrylnitril copolymer, polypropylene, polyethylene or mixtures thereof.
4. The composition according to claim 1 , containing as further component a conventional additive selected from antioxidants, flame retardants, clarifiers, UV absorbers and sterically hindered amines.
5. The composition according to claim 1 , containing as further component tin oxide doped with antimony (ATO), tin oxide doped with indium (ITO), zinc oxide doped with aluminum (AZO), zinc oxide doped with indium (IZO), zinc oxide doped with gallium (GaZO), LaB 6 , doped tungsten oxides (YWO x ), silver or gold nanoparticles, nanoprisms or nanorods or carbon nanotubes.
6. Architectural or automotive glazing in form of a monolithic sheet, a twin-wall sheet, a multi-wall sheet, a flat sheet or a corrugated sheet; or an agricultural film in form of a mono- or biaxially oriented film, a laminated film or a capstock film, comprising a composition according to claim 1 .