Polysulfone compositions exhibiting very low color and high...

Details Polysulfone compositions exhibiting very low color and high... Polysulfone compositions exhibiting very low color and high...

2003-04-15

2008-09-09

Truong, Duc (Department: 1796)

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

Synthetic resins

From sulfur-containing reactant

C528S171000, C528S373000, C438S031000, C438S643000

Reexamination Certificate

active

07423110

ABSTRACT:
A polysulfone composition is provided having a total luminous light transmittance of 84% or greater when measured on 0.1 inch thick specimens using ASTM D-1003. The specimens also meet at least one of the following two conditions: 1) a yellowness index (YI) of less than about 5.0 as measured according to ASTM D-1925 on 0.1 inch thick specimens, or 2) a color factor (CF) of less than about 25, wherein CF is defined by the following equation: CF=270[(x+y)sample−(x+y)air]/t, wherein x and y are chromaticity coordinates measured in transmittance mode and t is sample thickness in inches. Another polysulfone composition is provided comprising a polysulfone, an organic phosphorous-containing melt stabilizer, and at least one of the following additives: a blue to violet dye, and an organic optical brightener. The polysulfone composition of the present invention is used to form transparent molded articles such as ophthalmic lenses.

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Claims of U.S. Appl. No. 10/510,707.

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