Nanocomposites
Assignee3M Innovative Properties Company
InventorsPeter D. Condo, David Scott Thompson
Life of this patent
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Abstract
A nanocomposite includes at least one polymer and metal oxide nanoparticles dispersed in the at least one polymer. Each polymer can have a number average molecular weight of at least 10000 grams/mole. The at least one polymer includes a first polymer including (meth)acrylic acid monomer units. The metal oxide nanoparticles are surface modified with a carboxylic acid silane surface modifying agent. An aqueous dispersion that can be used to make the nanocomposite and a method of making the nanocomposite is described.
Claims23
A nanocomposite comprising:
- at least one polymer, each polymer having a number average molecular weight of at least 10000 grams/mole;
- the at least one polymer of the nanocomposite comprising a first polymer comprising (meth)acrylic acid monomer units;
- and
- metal oxide nanoparticles dispersed in the at least one polymer of the nanocomposite, the metal oxide nanoparticles being surface modified with a surface modifying agent comprising a carboxylic acid silane,
- wherein the nanocomposite has an optical haze of 10% or less, and
- wherein the first polymer further comprises ethylene monomer units, the at least one polymer further comprising a second polymer different from the first polymer, the second polymer comprising (meth)acrylic acid monomer units, ethylene monomer units, and at least one monomer unit selected from the group consisting of n-butyl acrylate, isobutyl acrylate, isopropyl acrylate, n-propyl acrylate, ethyl acrylate, methyl acrylate, 2-ethylhexyl acrylate, iso-octyl acrylate and methyl methacrylate.
An optical film comprising a nanocomposite layer disposed on a substrate, the substrate comprising a flexible glass layer or a nominally colorless polyimide layer, the nanocomposite layer comprising a nanocomposite comprising:
- at least one polymer, each polymer having a number average molecular weight of at least 10000 grams/mole;
- the at least one polymer of the nanocomposite comprising a first polymer comprising (meth)acrylic acid monomer units;
- and
- metal oxide nanoparticles dispersed in the at least one polymer of the nanocomposite, the metal oxide nanoparticles being surface modified with a surface modifying agent comprising a carboxylic acid silane,
- wherein the optical film has an optical haze of 10% or less.
An optical film comprising at least one layer comprising a nanocomposite, the optical film having an optical haze of less than 10%, the nanocomposite comprising:
- at least one polymer, each polymer having a number average molecular weight of at least 10000 grams/mole;
- the at least one polymer of the nanocomposite comprising a first polymer comprising (meth)acrylic acid monomer units;
- and
- metal oxide nanoparticles dispersed in the at least one polymer of the nanocomposite, the metal oxide nanoparticles being surface modified with a surface modifying agent comprising a carboxylic acid silane.
Dependencies are inferred from the claim text.