Curable compositions, abrasion-resistant articles, and method of thermoforming the same

Patent metadata

Field	Value
Publication number	US-2022169888-A1
Application number	US-202017436925-A
Country	US
Kind code	A1
Filing date	Apr 8, 2020
Priority date	Apr 11, 2019
Publication date	Jun 2, 2022
Grant date	—

Abstract

A curable composition comprises at least one polymerizable compound and alpha-alumina particles. The alpha-alumina particles, taken as a whole, have a DV50 of less than 100 nanometers. The corresponding cured composition, and an abrasion-resistant article comprising an abrasion-resistant layer comprising the reaction product disposed on a substrate are also disclosed. A method that includes thermoforming the abrasion-resistant article is also disclosed.

First claim

1 . A curable composition comprising:
at least one polymerizable compound; at least one curative for the at least one polymerizable compound, wherein the at least one curative comprises a free-radical initiator; and alpha-alumina particles, wherein the alpha-alumina particles, taken as a whole, have a D V 50 of less than 100 nanometers.

2 . The curable composition of claim 1 , wherein the at least one polymerizable compound comprises at least one free-radically polymerizable compound.

3 . (canceled)

4 . (canceled)

5 . The curable composition of claim 1 , further comprising a dispersant for the alpha-alumina particles, wherein the weight ratio of the dispersant to the alpha-alumina particles is from 0.2 to 1.2.

6 . The curable composition of claim 1 , wherein the curable composition is free of compounds containing groups that are covalently reactive with the alpha-alumina particles.

7 . The curable composition of claim 1 , wherein the alpha-alumina particles, taken as a whole, have a D V 50 of 50 to 80 nanometers.

8 . The curable composition of claim 1 , wherein, on a total weight basis, the curable composition contains 0.1 to 5 percent by weight of the alpha-alumina particles.

9 . The curable composition of claim 1 , wherein, on a total weight basis, the curable composition contains 0.1 to 2 percent by weight of the alpha-alumina particles.

10 . The curable composition of claim 1 , wherein the curable composition is optically transparent and colorless.

11 . A polymerized reaction product of components comprising:
at least one polymerizable compound; at least one curative for the at least one polymerizable compound, wherein the at least one curative comprises a free-radical initiator; and alpha-alumina particles, wherein the alpha-alumina particles, taken as a whole, have a D V 50 of less than 100 nanometers.

12 . An abrasion-resistant article comprising a substrate having an abrasion-resistant layer disposed thereon, wherein the abrasion-resistant layer comprises the polymerized reaction product of claim 11 .

13 . The abrasion-resistant article of claim 12 , wherein the substrate comprises an optical element.

14 . The abrasion-resistant article of claim 12 , wherein the substrate includes at least one of a painted layer or a polymeric clearcoat, and wherein the abrasion-resistant layer protects at least a portion of said at least one of the painted layer or the polymeric clearcoat.

15 . A method of making an abrasion-resistant thermoformed article, the method comprising thermoforming the abrasion-resistant article of claim 12 .

Assignees

• 3M Innovative Properties Co

Inventors

• Zhang Chunjie
• Wu Jung-Sheng
• Klun Thomas P
• Pokorny Richard J
• Coonce Benjamin R
• Ambur Gregg A

Classifications

• C09D175/14 Primary

  Polyurethanes having carbon-to-carbon unsaturated bonds · CPC title

• B05D7/56

  Three layers or more · CPC title

• C08G18/6755

  Unsaturated carboxylic acids · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K2201/011

  Nanostructured additives · CPC title