Color stable multilayer articles and method for making

Abstract

The color stability of a multilayer article comprising a top layer and and a substrate layer is enhanced by the addition of at least one unstable yellow colorant and optionally, at least one stable chromatic colorant to the top layer. The substrate layer includes a scattering white pigment and optionally, at least one stable chromatic colorant. Methods for making the aforementioned multilayer article are also provided in the present invention.

1 . A multilayer article comprising: 
 a substrate layer including at least one white scattering pigment and optionally, at least one stable chromatic colorants, and    at least one top layer including at least one thermoplastic polymer comprising structural units derived from at least one 1,3-dihydroxybenzene and at least one organodicarboxylic acid, at least one unstable yellow colorant and optionally, at least one stable chromatic colorants with the proviso that at least one layer includes the stable chromatic colorant.    
     
     
         2 . The multilayer article according to  claim 1 , wherein the white scattering pigment comprises titanium dioxide, barium sulfate, antimony oxide, calcium carbonate, zinc oxide, zinc sulfide, aluminum hydroxide, magnesium carbonate, mica, talc, quartz, or combinations thereof.  
     
     
         3 . The multilayer article according to  claim 2 , wherein the white scattering pigment comprises titanium dioxide.  
     
     
         4 . The multilayer article according to  claim 1 , wherein the white scattering pigment is present in a range between about 0.1% and about 10% by weight of the total weight of the substrate layer.  
     
     
         5 . The multilayer article according to  claim 1 , wherein the substrate comprises at least one thermoplastic polymer or at least one thermoset polymer.  
     
     
         6 . The multilayer article according to  claim 5 , wherein the substrate comprises a thermoplastic polymer.  
     
     
         7 . The multilayer article according to  claim 6 , wherein the thermoplastic polymer comprises a polycarbonate.  
     
     
         8 . The multilayer article according to  claim 1 , wherein the unstable yellow colorant has a yellow index half life between 100 and 350 kilojoules per meter squared per nanometer at 340 nanometer light exposure when exposed in a Xenon arc artificial weathering device.  
     
     
         9 . The multilayer article according to  claim 8 , wherein the unstable yellow colorant comprises Solvent Yellow 72, 7,8-dimethylalloxazine, or combinations thereof.  
     
     
         10 . The multilayer article according to  claim 1 , wherein the at least one stable chromatic colorant has a half-life of the maximum absorption measured between 400 and 700 nm greater than 3,000 kilojoules per meter squared per nanometer at 340 nanometer light exposure when exposed in a Xenon arc artificial weathering device.  
     
     
         11 . The multilayer article according to  claim 10 , wherein the at least one stable chromatic colorant comprises Pigment Blue 15:1, Pigment Blue 15:4, Pigment Blue 28, Pigment Blue 29, Pigment Blue 36, Pigment Blue 60, Pigment Green 36, Pigment Green 50, Pigment Green 7, Pigment Violet 15, Pigment Yellow 138, Pigment Yellow 53, Pigment Yellow 183, Pigment Yellow 24, Solvent Blue 97, Solvent Green 28, Solvent Green 3, Solvent Orange 60, Pigment Red 101, Pigment Red 178, Pigment Red 181, Solvent Red 135, Solvent Red 169, Solvent Violet 13, Solvent Violet 36, Solvent Yellow 163, Solvent Yellow 93, Pigment Black 7, or combinations thereof.  
     
     
         12 . The multilayer article according to  claim 1 , wherein the top layer comprises a block copolyestercarbonate.  
     
     
         13 . The multilayer article according to  claim 12 , wherein the at least one 1,3-dihydroxybenzene is unsubstituted resorcinol.  
     
     
         14 . The multilayer article according to  claim 12 , wherein the at least one organodicarboxylic acid is a mixture of isophthalic acid and terephthalic acid.  
     
     
         15 . The multilayer article according to  claim 14 , wherein the ratio of isophthalic-derived structural units to terephthalic-derived structural units is about 0.25-4.0:1.  
     
     
         16 . The multilayer article according to  claim 15 , wherein the ratio of isophthalic-derived structural units to terephthalic-derived structural units is about 0.40-2.5:1.  
     
     
         17 . The multilayer article according to  claim 12 , wherein the block copolyestercarbonate comprises bisphenol-A.  
     
     
         18 . The multilayer article according to  claim 1  having a whiteness measured by CIE L*a*b* wherein L* is greater than 80.  
     
     
         19 . The multilayer article according to  claim 18  having a whiteness wherein L* is greater than 85.  
     
     
         20 . The multilayer article of  claim 1  which is an aircraft, automotive, truck, military vehicle, military aircraft, water-borne military vehicle, or motorcycle exterior or interior component, a panel, quarter panel, rocker panel, trim, fender, door, decklid, trunklid, hood, bonnet, roof, bumper, fascia, grill, mirror housing, pillar applique, cladding, body side molding, wheel cover, hubcap, door handle, spoiler, window frame, headlamp bezel, headlamp, tail lamp, tail lamp housing, tail lamp bezel, license plate enclosure, roof rack, or running board; an enclosure, housing, panel, or part for an outdoor vehicle or outdoor device; an enclosure for an electrical or telecommunication device; outdoor furniture; an article for boat or marine equipment, trim, enclosures, and housings; an outboard motor housing; a depth finder housing; a personal water-craft; a jet-ski; a pool; a spa; a hot-tub; a step; a step covering; a building or construction application glazing, roofs, windows, floors, decorative window furnishings or treatments; a treated glass cover for pictures, painting, posters, or display items; an optical lens; an ophthalmic lens; a corrective ophthalmic lens; an implantable ophthalmic lens; a wall panel, or door; a protected graphic; an outdoor or indoor sign; an enclosure, housing, panel, or part for automatic teller machines (ATM); an enclosure, housing, panel, or part for lawn or garden tractors, lawn mowers, or tools, lawn and garden tools; a window or door trim; an article of sports equipment or a toy; an enclosure, housing, panel, or part for a snowmobile; a recreational vehicle panel or component; an article of playground equipment; an article made from combinations of plastic and wood; a golf course marker; a utility pit cover; a computer housing; a desk-top computer housing; a portable computer housing; a lap-top computer housing; a palm-held computer housing; a monitor housing; a printer housing; a keyboard; a FAX machine housing; a copier housing; a telephone housing; a mobile phone housing; a radio sender housing; a radio receiver housing; a light fixture; a lighting appliance; a network interface device housing; a transformer housing; an air conditioner housing; an article of cladding or seating for public transportation; an article of cladding or seating for trains, subways, or buses; a meter housing; an antenna housing; an article of cladding for satellite dishes; a coated helmet or other article of personal protective equipment; a coated synthetic or natural textile; a coated photographic film or photographic print; a coated painted article; a coated dyed article; a coated fluorescent article; or a coated foam article.  
     
     
         21 . A multilayer article comprising: 
 a substrate layer including carbonate structural units, titanium dioxide, and at least one stable chromatic colorant, and    at least one top layer including isophthalate/terephthalate structural units and at least one unstable yellow colorant comprising Solvent Yellow 72, 7,8-dimethylalloxazine, or combinations thereof.    
     
     
         22 . A method for preparing a multilayer article comprising: 
 providing a substrate layer including at least one white scattering pigment and optionally, at least one stable chromatic colorant, and    applying at least one top layer to the substrate layer wherein the top layer includes at least one thermoplastic polymer comprising structural units derived from at least one 1,3-dihydroxybenzene and at least one organodicarboxylic acid, at least one unstable yellow colorant, and optionally, at least one stable chromatic colorant with the proviso that at least one layer includes the chromatic colorant.    
     
     
         23 . The method according to  claim 22 , wherein the white scattering pigment comprises titanium dioxide, barium sulfate, antimony oxide, calcium carbonate, zinc oxide, zinc sulfide, aluminum hydroxide, magnesium carbonate, mica, talc, quartz, or combinations thereof.  
     
     
         24 . The method according to  claim 23 , wherein the white scattering pigment comprises titanium dioxide.  
     
     
         25 . The method according to  claim 22 , wherein the white scattering pigment is present in a range between about 0.1% by weight and about 10% by weight of the total weight of the substrate layer.  
     
     
         26 . The method according to  claim 22 , wherein the substrate comprises at least one thermoplastic polymer or at least one thermoset polymer.  
     
     
         27 . The method according to  claim 26 , wherein the substrate comprises a thermoplastic polymer.  
     
     
         28 . The method according to  claim 27 , wherein the thermoplastic polymer comprises a polycarbonate.  
     
     
         29 . The method according to  claim 22 , wherein the unstable yellow colorant has a yellow index half life in a range between about 100 kilojoules per meter squared per nanometer and about 350 kilojoules per meter squared per nanometer at 340 nanometer light exposure.  
     
     
         30 . The method according to  claim 29 , wherein the unstable yellow colorant comprises Solvent Yellow 72, 7,8-dimethylalloxazine, or combinations thereof.  
     
     
         31 . The method according to  claim 22 , wherein the at least one stable chromatic colorant has a half life of the maximum absorption measure in a range between 400 nanometers and 700 nanometers greater than 3000 kilojoules per meter squared per nanometer at 340 nanometer light exposure.  
     
     
         32 . The method according to  claim 31 , wherein the at least one stable chromatic colorant comprises Pigment Blue 15:1, Pigment Blue 15:4, Pigment Blue 28, Pigment Blue 29, Pigment Blue 36, Pigment Blue 60, Pigment Green 36, Pigment Green 50, Pigment Green 7, Pigment Violet 15, Pigment Yellow 138, Pigment Yellow 53, Pigment Yellow 183, Pigment Yellow 24, Solvent Blue 97, Solvent Green 28, Solvent Green 3, Solvent Orange 60, Pigment Red 101, Pigment Red 178, Pigment Red 181, Solvent Red 135, Solvent Red 169, Solvent Violet 13, Solvent Violet 36, Solvent Yellow 163, Solvent Yellow 93, Pigment Black 7, or combinations thereof.  
     
     
         33 . The method according to  claim 22 , wherein the top layer comprises a block copolyestercarbonate.  
     
     
         34 . The method according to  claim 33 , wherein the at least one 1,3-dihydroxybenzene is unsubstituted resorcinol.  
     
     
         35 . The method according to  claim 33 , wherein the at least one organodicarboxylic acid is a mixture of isophthalic acid and terephthalic acid.  
     
     
         36 . The method according to  claim 35 , wherein the ratio of isophthalic-derived structural units to terephthalic-derived structural units is about 0.25-4.0:1.  
     
     
         37 . The method according to  claim 36 , wherein the ratio of isophthalic-derived structural units to terephthalic-derived structural units is about 0.40-2.5:1.  
     
     
         38 . The method according to  claim 22  having a whiteness measured by CIE L*a*b* wherein L* is greater than 80.  
     
     
         39 . The method according to  claim 38  having a whiteness wherein L* is greater than 85.  
     
     
         40 . A method for preparing a multilayer article comprising: 
 providing a substrate layer including carbonate structural units, titanium dioxide, and at least one stable chromatic colorant, and    applying at least one top layer to the substrate layer wherein the top layer includes isophthalate/terephthalate structural units, at least one unstable yellow colorant comprising solvent yellow 72, 7,8-dimethyalloxazine or combinations thereof.