	US 11,866,609 B2
	Optically clear adhesives containing a trialkyl borane complex initiator and photoacid
Christopher J. Campbell, Burnsville, MN (US); John W. Campbell, St. Paul, MN (US); Mark F. Ellis, St. Paul, MN (US); Kathleen S. Shafer, Woodbury, MN (US); and Wayne S. Mahoney, St. Paul, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 16/770,984
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 10, 2018, PCT No. PCT/IB2018/059832 § 371(c)(1), (2) Date Jun. 9, 2020, PCT Pub. No. WO2019/116201, PCT Pub. Date Jun. 20, 2019.
Claims priority of provisional application 62/598,222, filed on Dec. 13, 2017.
Prior Publication US 2020/0317956 A1, Oct. 8, 2020
Int. Cl. C09D 4/00 (2006.01); B32B 27/30 (2006.01); C08F 2/50 (2006.01); C08K 5/55 (2006.01); C09J 4/00 (2006.01); C08K 5/05 (2006.01)

CPC C09D 4/00 (2013.01) [B32B 27/30 (2013.01); C08F 2/50 (2013.01); C08K 5/05 (2013.01); C09J 4/00 (2013.01)]

19 Claims

1. An optically clear adhesive composition comprising:

a free-radically polymerizable acrylate or meth(acrylate) functional acrylic oligomer;

a trialkyl borane-amine complex initiator, wherein the amine is decomplexed by reaction with a superacid to initiate polymerization of the free-radically polymerizable acrylate or meth(acrylate) functional acrylic oligomer;

a photoacid generator that generates a superacid upon exposure to actinic radiation; and

a photosensitizer wherein the photosensitizer absorbs light and transfers energy or an electron to the photoacid generator,

wherein the photosensitizer is a benzoin ether,

wherein a viscosity of the composition immediately after mixing and a viscosity of the composition about 24 hours after mixing changes by less than about 10%.