Invention Grant
US07662909B2 Polysulfone compositions exhibiting very low color and high light transmittance properties and articles made therefrom 有权
具有非常低的颜色和高透光性的聚砜组合物和由其制成的制品

Polysulfone compositions exhibiting very low color and high light transmittance properties and articles made therefrom
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.
Information query
Patent Agency Ranking
0/0