	US 11,795,331 B2
	Curable photochromic compositions
Michael F. Haley, Glenshaw, PA (US); Linda K. Anderson, Allison Park, PA (US); Anthony T. Gestrich, Pittsburgh, PA (US); David B. Knowles, Apollo, PA (US); Stephen Robinson, Murrysville, PA (US); Feng Wang, Export, PA (US); and Elizabeth A. Zezinka, Cranberry Township, PA (US)
Assigned to Transitions Optical, Inc., Pinellas Park, FL (US)
Filed by Transitions Optical, Inc., Pinellas Park, FL (US)
Filed on Feb. 17, 2021, as Appl. No. 17/177,322.
Application 17/177,322 is a continuation of application No. 15/746,068, granted, now 10,954,397, previously published as PCT/US2015/045470, filed on Aug. 17, 2015.
Prior Publication US 2021/0163761 A1, Jun. 3, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 1/04 (2006.01); G02C 7/10 (2006.01); C08G 18/44 (2006.01); C08G 18/40 (2006.01); C09D 5/29 (2006.01); C08G 18/62 (2006.01); C08G 18/73 (2006.01); C08G 18/80 (2006.01); C08G 18/22 (2006.01); C08G 18/24 (2006.01); C09D 175/04 (2006.01); C08G 18/32 (2006.01); C08G 18/38 (2006.01); C08K 5/00 (2006.01); C08G 18/48 (2006.01); C09D 175/02 (2006.01); G02B 1/14 (2015.01); C08G 18/10 (2006.01); C08K 5/1545 (2006.01)

CPC C09D 5/29 (2013.01) [C08G 18/10 (2013.01); C08G 18/227 (2013.01); C08G 18/246 (2013.01); C08G 18/3228 (2013.01); C08G 18/3812 (2013.01); C08G 18/4063 (2013.01); C08G 18/44 (2013.01); C08G 18/485 (2013.01); C08G 18/6254 (2013.01); C08G 18/73 (2013.01); C08G 18/80 (2013.01); C08G 18/807 (2013.01); C08K 5/0041 (2013.01); C08K 5/1545 (2013.01); C09D 175/02 (2013.01); C09D 175/04 (2013.01); G02B 1/041 (2013.01); G02B 1/14 (2015.01); G02C 7/102 (2013.01)]

24 Claims

1. A curable photochromic composition comprising:

(a) a first component comprising a first compound having at least two active hydrogen-functional groups and an active hydrogen-functional group equivalent weight of at least 1000, wherein said first compound comprises a polyol, and said polyol of said first compound is selected from polyether polyols, polyester polyols, polycarbonate polyols, and combinations thereof;

(b) a second component comprising at least one of a polyisocyanate and a blocked polyisocyanate; and

wherein the ratio of total isocyanate and blocked isocyanate group equivalents of the second component to total active hydrogen-functional group equivalents is at least 4:1.