Flexible hardcoat

Patent metadata

Field	Value
Publication number	US-2022195217-A1
Application number	US-202017603979-A
Country	US
Kind code	A1
Filing date	May 4, 2020
Priority date	May 9, 2019
Publication date	Jun 23, 2022
Grant date	—

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.

First claim

1 . A hardcoat composition comprising:
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 semi-reactive nanoparticles having a reactive functional group and a non-reactive functional group, the population of semi-reactive nanoparticles have an average particle diameter in a range from 5 nm to 60 nm

2 . A hardcoat composition comprising:
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 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.

3 . The hardcoat composition according to claim 2 , wherein the non-reactive surface treatment for the semi-reactive population is a compound having a formula R—SiR′m(OR″)3-m, wherein R is methyl, R′ is a (C1-C2)alkyl, R″ is a (C1-C2)alkyl, and m is an integer from 0 to 2.

4 . The hardcoat composition according to claim 2 , wherein the non-reactive surface treatment for the semi-reactive population is a compound having a formula R—SiR′m(OR″)3-m, wherein R is methyl, m is 0, and R″ is a ethyl or methyl.

5 . The hardcoat composition according to claim 2 , wherein the reactive surface treatment compound has a general formula X′-L′-SiR′m(OR″)3-m, wherein X′ is a (meth)acryl or vinyl group, L′ is an (C3)alkylene, m is 0, and R″ is a ethyl or methyl.

6 . The hardcoat composition according to claim 1 , wherein the semi-reactive nanoparticles comprise:
1 to 50 mol % reactive functional groups; and 99 to 50 mol % non-reactive functional groups.

7 . The hardcoat composition according to claim 1 , wherein the semi-reactive nanoparticles comprise:
1 to 30 mol % reactive functional groups; and 99 to 70 mol % non-reactive functional groups.

8 . The hardcoat composition according to claim 1 , wherein the semi-reactive nanoparticles comprise:
1 to 20 mol % reactive functional groups; and 99 to 80 mol % non-reactive functional groups.

9 . The hardcoat composition according to claim 1 , wherein the semi-reactive nanoparticles comprise:
1 to 10 mol % reactive functional groups; and 99 to 90 mol % non-reactive functional groups.

10 . The hardcoat composition according to claim 1 , wherein the one or more multifunctional (meth)acrylate monomers form at least 95 wt %, or at least 97 wt %, or at least 98 wt % of monomers in the hardcoat composition, and the hardcoat composition contains less than 5 wt %, or less than 3 wt %, or less than 2 wt %, or less than 1 wt %, urethane.

11 . The hardcoat composition according to claim 1 , wherein the population of semi-reactive nanoparticles have an average particle diameter in a range from 10 nm to 40 nm.

12 . The hardcoat composition according to claim 1 , wherein the nanoparticle mixture is present in the hardcoat composition at a loading in a range from 30 to 68 wt % by weight total solids, and the nanoparticle mixture comprises inorganic oxide particles.

13 . The hardcoat composition according to claim 1 , wherein the nanoparticle mixture is present in the hardcoat composition at a loading in a range from 40 to 60 wt % by weight total solids, and the nanoparticle mixture comprises inorganic oxide particles.

14 . The hardcoat composition according to claim 1 , wherein the nanoparticle mixture is present in the hardcoat composition at a loading in a range 50 to 60 wt % by weight total solids, and the nanoparticle mixture comprises inorganic oxide particles.

15 . The hardcoat composition according to claim 1 , wherein the population of semi-reactive nanoparticles has an average particle diameter in a range from 10 nm to 30 nm.

16 . The hardcoat composition according to claim 1 , wherein the population of semi-reactive nanoparticles comprise silica.

17 . A hardcoat comprising a reaction product of the hardcoat composition of claim 1 .

18 . The hardcoat according to claim 17 , wherein the hardcoat has a uniform thickness in a range from 1 to 10 micrometers, 1 to 7 micrometers, from 2 to 6 micrometers, or from 2.5 to 5 micrometers.

19 . A hardcoat film comprising;
a substrate; and the hardcoat, according to claim 17 , disposed on the substrate.

20 . The hardcoat film according to claim 19 , wherein the substrate is a visible light transparent thermoplastic substrate having a uniform thickness in a range from about 20 to about 350 micrometers, or 20 to 150 micrometers, or from about 20 to 100 micrometers.

21 - 34 . (canceled)

Assignees

• 3M Innovative Properties Co

Inventors

• Condo Peter D
• Thompson David Scott
• Stradinger John J
• Leatherdale Catherine A
• Pokorny Richard J
• Solomonson Steven D

Classifications

• C08F2/14

  Organic medium · CPC title

• C08F2/44

  Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title

• C09D5/02

  Emulsion paints {including aerosols} · CPC title

• C08K3/36

  Silica · CPC title