Molded reflectors for light-emitting diode assemblies
AssigneeTicona LLC
InventorBing Lu
Life of this patent
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Abstract
Polymer compositions are described containing a poly(1,4-cyclohexanedimethanol terephthalate) polymer in combination with a white pigment and optionally one or more reinforcing fillers. In accordance with the present disclosure, the composition also contains one or more reactive viscosity stabilizers. In order to prevent against yellowing, the composition is free of various aromatic epoxy resins, such as novolac epoxy resins. The polymer composition has excellent reflectance properties making the composition well suited for producing reflectors for light sources, such as LED assemblies.
Claims21
A composition for producing molded parts comprising:
- from about 20% to less than 60% by weight of a poly(1,4-cyclohexanedimethanol terephthalate);
- from about 1% to about 40% by weight of an inorganic filler;
- from about 15% to about 50% by weight of a white pigment;
- from about 0.5% to about 8% by weight of one or more reactive viscosity stabilizers, wherein at least one of the reactive viscosity stabilizers comprises a phenoxy resin or a non-aromatic epoxy resin;
- and wherein the composition is free of aromatic epoxy resins and wherein the composition has a spiral flow of greater than 5 inches and wherein the composition has a whiteness index after aging at 200° C. for four hours of greater than 60.
A composition for producing molded parts comprising a polymeric material being comprised of from about 20% to about 60% by weight of a poly(1,4-cyclohexanedimethanol terephthalate), from about 1% to about 40% by weight of an inorganic filler, from about 15% to about 50% by weight of a white pigment, and from about 0.5% to about 8% by weight of at least one reactive viscosity stabilizer, the reactive viscosity stabilizer comprising a phenoxy resin or a non-aromatic epoxy resin, the polymeric material being free of aromatic epoxy resins, the polymeric material having an initial reflectance at 460 nm of greater than about 90%, having an initial whiteness index of greater than about 86, and having a whiteness index after aging at 200° C. for four hours of greater than about 60.
A composition for producing molded parts comprising a polymeric material being comprised of from about 20% to about 54.5% by weight of a poly(1,4-cyclohexanedimethanol terephthalate), from about 1% to about 40% by weight of an organic filler, from about 15% to about 50% by weight of a white pigment, and from about 0.5% to about 8% by weight of at least one reactive viscosity stabilizer, the reactive viscosity stabilizer comprising a phenoxy resin, the polymeric material being free of aromatic epoxy resins;
- and wherein the composition has a whiteness index after aging at 200° C. for four hours of greater than about 60.
Dependencies are inferred from the claim text.