Polymer hard coat and methods of preparation

Patent metadata

Field	Value
Publication number	US-10510985-B2
Application number	US-201615181722-A
Country	US
Kind code	B2
Filing date	Jun 14, 2016
Priority date	Jun 14, 2016
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A dispersion comprised of at least 49 wt % of additive particles, a polymerizable monomer, a dispersant and a solvent. Upon polymerization the dispersion forms a hard coat with a haze of at most 0.5% and a transmission of at least 90%. A hard coat comprises at least 49 wt % of additive particles dispersed in a polymer. A method of making a hard coat comprises forming a dispersion, applying the dispersion to one side of a substrate, and polymerizing the dispersion. The hard coat has a haze of at most 0.5% and a transmission of at least 90%.

First claim

What is claimed is:

1. A hard coat, comprising:
additive particles dispersed in a polymer, wherein the additive particles are silicon dioxide, the hard coat is formed from a dispersion applied to a front side of a polyimide (PI) substrate with a thickness of 0.05 millimeters (mm) and 57.8 wt % silicon dioxide, the dispersion is applied to a back side of the PI substrate with 35.3 wt % silicon dioxide, the hard coat has a haze of at most 0.5% and a transmission of at least 90%, wherein the dispersion comprises a polymerizable monomer, a dispersant, and a solvent, and
the hard coat may be bent to a diameter of at least 10 mm without breaking, bucking or delaminating.

2. The hard coat of claim 1 , wherein
the polymerizable monomer is selected from the group consisting of acrylates and acrylamides, and
upon polymerization, the hard coat has a color in a L*a*b* colorimetric system between −1.0 to 1.0 for b*.

3. The hard coat of claim 2 , wherein the dispersion comprises 49-65 wt % of additive particles.

4. The hard coat of claim 2 , wherein the dispersant is a hyperdispersant.

5. The hard coat of claim 2 , wherein the additive particles have a diameter of at most 250 nm.

6. The hard coat of claim 2 , wherein the solvent is a complexing solvent.

7. The hard coat of claim 2 , wherein the polymerizable monomer is an acrylate monomer, and the dispersant is a hyperdispersant.

8. A method comprising:
forming the hard coat of claim 1 .

9. The method of claim 8 , wherein the hard coat has a color in a L*a*b* colorimetric system between −1.0 to 1.0 for b*.

10. The method of claim 9 , wherein the dispersion further comprises a hyperdispersant.

11. The method of claim 9 , wherein the applying the dispersion comprises applying the dispersion to both sides of the PI substrate.

12. A hard coat, comprising additive particles dispersed in a polymer,
wherein the additive particles are silicon dioxide, the hard coat is formed from a dispersion applied to a front side of a polyimide (PI) substrate with a thickness of 0.05 millimeters (mm) and 57.8 wt % silicon dioxide, the dispersion is applied to a back side of the PI substrate with 35.3 wt % silicon dioxide, the hard coat has a haze of at most 0.5% and a transmission of at least 90%, and
the hard coat may be bent to a diameter of at least 10 mm without breaking, buckling or delaminating.

13. The hard coat of claim 12 , wherein
the polymer is selected from the group consisting of acrylate polymers and acrylamide polymers, and
the hard coat has a color in a L*a*b* colorimetric system between −1.0 to 1.0 for b*.

14. The hard coat of claim 13 , wherein the hard coat increases the tensile modulus of a plastic substrate to at least 4.5 GPa.

15. The hard coat of claim 13 , wherein the hard coat has a haze of at most 20% after silicon carbide (SiC) abrasion.

16. A flexible device comprising a plastic organic light emitting diode (pOLED) display, wherein the pOLED has been coated with the hard coat of claim 12 .

Assignees

• Motorola Mobility Llc

Inventors

• Brotzman Richard W
• Sirois Ernest
• Thorstenson Daniel

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C08J2433/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C08K3/22

  of metals · CPC title

• C08K3/08

  Metals · CPC title

• Y02E10/549

  Organic PV cells · CPC title