White light-shielding compositions and articles comprising same

Details White light-shielding compositions and articles comprising same White light-shielding compositions and articles comprising same

2011-04-19

2011-04-19

Zimmer, Marc S (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C524S424000, C524S430000, C524S431000, C524S432000, C524S611000

Reexamination Certificate

active

07928168

ABSTRACT:
A polymer composition is provided which is white and opaque (i.e. shields from light). The polymer composition comprises a blend of (i) a silicon-free polycarbonate polymer and (ii) a polycarbonate-polysiloxane copolymer; a whitener such as titanium dioxide; and (iii) a non-white colorant such as carbon black. The resulting composition, when molded and measured at a thickness of 0.75 mm, has an L* of greater than 80 and a % T of less than 1%. The composition also has good impact strength at low temperatures and good stability during processing.

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