US 11,787,970 B2
Flexible hardcoat
Peter D. Condo, Lake Elmo, MN (US); D. Scott Thompson, Bayport, MN (US); John J. Stradinger, Roseville, MN (US); Catherine A. Leatherdale, Woodbury, MN (US); Richard J. Pokorny, Maplewood, MN (US); and Steven D. Solomonson, Shoreview, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 16/891,903
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 6, 2018, PCT No. PCT/IB2018/059725
§ 371(c)(1), (2) Date Jun. 3, 2020,
PCT Pub. No. WO2019/111207, PCT Pub. Date Jun. 13, 2019.
Claims priority of provisional application 62/596,525, filed on Dec. 8, 2017.
Prior Publication US 2020/0377752 A1, Dec. 3, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 5/18 (2006.01); C09D 7/62 (2018.01); C09D 4/00 (2006.01); C08K 3/34 (2006.01); G02B 1/14 (2015.01); C09D 135/02 (2006.01); C09D 7/40 (2018.01); C08J 7/04 (2020.01); C08J 7/046 (2020.01); C08J 7/043 (2020.01); C08J 5/18 (2006.01); C09D 5/00 (2006.01)
CPC C09D 135/02 (2013.01) [C08J 5/18 (2013.01); C08J 7/042 (2013.01); C08J 7/043 (2020.01); C08J 7/046 (2020.01); C08J 7/0427 (2020.01); C09D 5/002 (2013.01); C09D 7/62 (2018.01); C09D 7/67 (2018.01); G02B 1/14 (2015.01); C08J 2367/02 (2013.01); C08J 2435/02 (2013.01)] 20 Claims
 
1. A hardcoat composition comprising:
one or more multifunctional (meth)acrylate monomers; and
a nanoparticle mixture dispersed within the one or more multifunctional (meth)acrylate monomers, the nanoparticle mixture comprising:
1% to 15% of a first population of reactive nanoparticles wherein reactive nanoparticles are nanoparticles modified with surface groups that react with the multifunctional (meth)acrylate monomers, the first population of reactive nanoparticles have an average particle diameter in a range from 5 nm to 60 nm; and
99% to 85% of a second population of non-reactive nanoparticles wherein non-reactive nanoparticles are nanoparticles modified with surface groups that are not capable of reacting with the multifunctional (meth)acrylate monomers, the second population of non-reactive nanoparticles have an average particle diameter in a range from 5 nm to 60 nm, wherein the hardcoat composition upon curing forms a hardcoat that exhibits no visible scratch after at least 500 scratch cycles when tested for abrasion resistance using a mechanical device with a 3.0 kg weight and capable of oscillating an abrasive material adhered to a stylus across the hardcoat where the oscillation was performed perpendicular to the coating direction, and the stylus was a cylinder with a flat base and a diameter of 3.2 cm, oscillated over a 60 mm wide sweep width at a rate of 210 mm/sec (2 wipes/second), and the abrasive material was steel wool #0000 adhered to the stylus.