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US 11,827,811 B2Granted
Flexible hardcoat
Assignee3M Innovative Properties Company
InventorsPeter D. Condo, David Scott Thompson, John J. Stradinger, Catherine A. Leatherdale, Richard J. Pokorny, Steven D. Solomonson
Life of this patent
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Abstract
A hardcoat composition includes one or more multifunctional (meth)acrylate monomers, and a population of semi-reactive nanoparticles dispersed within the one or more multifunctional (meth)acrylate monomers. The population of semi-reactive nanoparticles have an average particle diameter in a range from 5 nm to 60 nm.
Claims17
A hardcoat composition comprising:
- one or more multifunctional (meth)acrylate monomers comprising:
- at least one first (meth)acrylate monomers with at least 3 (meth)acrylate groups and alkoxy repeat units;
- and
- at least one second multi-functional (meth)acrylate monomer that is different from the first monomer;
- and
- a population of semi-reactive silica nanoparticles dispersed within the one or more multifunctional (meth)acrylate monomers, the semi-reactive silica nanoparticles having a reactive functional group and a non-reactive functional group, the population of semi-reactive silica nanoparticles have an average particle diameter in a range from 10 nm to 40 nm, wherein the semi-reactive silica nanoparticles comprise 1 to 30 mol % reactive functional groups;
- and 99 to 70 mol % non-reactive functional groups, 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, and exhibits an average curl of less than or equal to 2.0 millimeters when tested for curl by cutting a 7.6 cm×7.6 cm (3 inches×3 inches) sample and permitting the sample to lie flat on a table and measuring the edge lift of the 4 corners of the sample from the table surface and averaging.
4 more elements
A hardcoat composition comprising:
- one or more multifunctional (meth)acrylate monomers;
- and
- a population of semi-reactive silica nanoparticles dispersed within the one or more multifunctional (meth)acrylate monomers, the population of semi-reactive silica nanoparticles have an average particle diameter in a range from 10 nm to 40 nm and comprise;
- a non-reactive functional group formed by a non-reactive surface treatment with a compound having a general formula R—SiR′m(OR″)3-m, wherein R is methyl or ethyl, R′ is a (C1-C4)alkyl, R″ is a (C1-C4)alkyl, m is an integer from 0 to 2;
- and
- a reactive functional group formed by a reactive surface treatment with a compound having a general formula X′-L′-SiR′m(OR″)3-m, wherein X′ is a free-radically polymerizable group, L′ is an (C1-C12)alkylene, R′ is a (C1-C4)alkyl, R″ is a (C1-C4)alkyl, m is an integer from 0 to 2, 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, and exhibits an average curl of less than or equal to 2.0 millimeters when tested for curl by cutting a 7.6 cm×7.6 cm (3 inches×3 inches) sample and permitting the sample to lie flat on a table and measuring the edge lift of the 4 corners of the sample from the table surface and averaging, and the hardcoat does not crack, craze or delaminate after at least 50,000 dynamic folding cycles as tested using a dual pivot dynamic fold tester having two coplanar plates with parallel pivot axes where both plates can rotate by 90 degrees to face each other with a gap of 8 mm, and the motor drive rotated both plates from zero to 90 degrees at the same time at a rate of 30 folds/minute, wherein the samples tested were 3 sets of 7.0 inch×1.0 inch (17.8 cm×2.5 cm) pieces of each sample attached to the folding plates coating side down (hardcoat in tension) using 1.0 inch (2.5 cm) wide strips of a double sided tape.
3 more elements
Dependencies are inferred from the claim text.