Molded reflectors for light-emitting diode assemblies

摘要

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.

主权项

1. 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.