Carol Knox - Apollo PA, US Shawn P. Duffy - Cheswick PA, US Luciano M. Parrinello - Allison Park PA, US Nicholas J. Parise - Pittsburgh PA, US Brian K. Rearick - Allison Park PA, US
The present invention is directed to microfiltration and ultrafiltration membranes comprising a microporous material. The microporous material comprises:
- Tuam, IE Elizabeth A. ZEZINKA - Cranberry Township PA, US Emily AMOND - Allison Park PA, US Anu CHOPRA - Pittsburgh PA, US Michael Frank HALEY - Glenshaw PA, US Sujit MONDAL - Gibsonia PA, US Nicholas J. PARISE - Pittsburgh PA, US Brian SHAUGHNESSY - Kilmaine, IE Robert W. WALTERS - Murrysville PA, US Wenjing XIAO - Murrysville PA, US An-Hung YEH - Mars PA, US
The present invention relates to a photochromic article that includes a substrate and a photochromic layer formed from a curable photochromic composition. The photochromic composition includes a polyol component that includes a polycarbonate diol, an isocyanate component that includes an unblocked polyfunctional isocyanate and/or a blocked polyfunctional isocyanate, and at least one photochromic compound. The equivalents ratio of blocked/unblocked isocyanate equivalents of the isocyanate component to hydroxyl equivalents of the polyol component is at least 5:1. The photochromic article exhibits a T(Fade Half Life) at 23 C. of less than or equal to 70 seconds.
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