US 11,754,752 B2
Photochromic polyurethane laminate
Hannah Vu, Ramsey, MN (US); Hideyo Sugimura, Ramsey, MN (US); Ping Fan, Ramsey, MN (US); and Hao Vu, Ramsey, MN (US)
Assigned to HOYA Optical Labs of America, Inc., Lewisville, TX (US)
Filed by HOYA OPTICAL LABS OF AMERICA, INC., Lewisville, TX (US)
Filed on Nov. 1, 2021, as Appl. No. 17/516,619.
Application 17/516,619 is a division of application No. 16/410,657, filed on May 13, 2019, granted, now 11,181,666.
Application 16/410,657 is a division of application No. 15/838,037, filed on Dec. 11, 2017, granted, now 10,330,828, issued on Jun. 25, 2019.
Application 14/864,748 is a division of application No. 13/563,236, filed on Jul. 31, 2012, granted, now 9,163,108, issued on Oct. 20, 2015.
Application 15/838,037 is a continuation of application No. 14/864,748, filed on Sep. 24, 2015, granted, now 9,869,801, issued on Jan. 16, 2018.
Application 13/563,236 is a continuation in part of application No. 12/763,103, filed on Apr. 19, 2010, abandoned.
Claims priority of provisional application 61/170,473, filed on Apr. 17, 2009.
Prior Publication US 2022/0050226 A1, Feb. 17, 2022
Int. Cl. G02B 1/04 (2006.01); C08G 18/75 (2006.01); C08G 18/42 (2006.01); B32B 27/40 (2006.01); C08G 2/10 (2006.01); C08G 18/32 (2006.01); C08G 18/10 (2006.01); G02B 5/23 (2006.01); G02C 7/10 (2006.01)
CPC G02B 1/041 (2013.01) [B32B 27/40 (2013.01); C08G 2/10 (2013.01); C08G 18/10 (2013.01); C08G 18/3206 (2013.01); C08G 18/4277 (2013.01); C08G 18/758 (2013.01); G02B 5/23 (2013.01); G02C 7/102 (2013.01); Y10T 428/31551 (2015.04)] 19 Claims
OG exemplary drawing
 
1. A photochromic polyurethane laminate comprising:
a crosslinked photochromic polyurethane host layer prepared from a composition comprising:
a polyurethane;
an isocyanate prepolymer;
a crosslinking agent comprising a blocked isocyanate with three or more functional isocyanate groups; and
a photochromic agent;
a first resin layer attached to a first side of the crosslinked photochromic polyurethane layer; and
a second resin layer attached to a second side of the crosslinked photochromic polyurethane layer.