Method for making nanocomposite film

Patent metadata

Field	Value
Publication number	US-2023414841-A1
Application number	US-202318463335-A
Country	US
Kind code	A1
Filing date	Sep 8, 2023
Priority date	Nov 3, 2020
Publication date	Dec 28, 2023
Grant date	—

Abstract

A health care and/or entertainment device protective film may be configured to contact human skin, e.g., to limit the transmission of infection by bacteria, fungi, protozoa, prions, and/or viruses. The film may be formed as a nanocomposite film including at least 75 wt. %, relative to total organic matrix weight, of polyethylene, silver particles, and TiO2 particles, wherein the silver particles and TiO2 particles are distributed within and/or on an outer surface of the polyethylene, wherein the silver particles have a size of 1 to 1,000 nm, and wherein the TiO2 particles have a size of 1 to 50 nm. Such films may be applied to health care and/or entertainment devices, including virtual reality googles.

First claim

1 . (canceled)

2 . The method of claim 11 , wherein the nanocomposite film comprises, based on a total weight of the nanocomposite film:
1 to 5 wt. % of the silver particles; and 1 to 10 wt. % of the TiO 2 particles.

3 . The method of claim 11 , wherein a thickness of the outer surface of the organic matrix is in a range of from 0.025 to 25 μm.

4 . The method of claim 11 , wherein the polyethylene in the nanocomposite film is LDPE and is present in an amount of at least 97.5 wt. % relative to the relative to the total weight of the organic matrix.

5 . The method of claim 11 , wherein the polyethylene in the nanocomposite film has a melting point in a range of from 90 to 125° C.

6 . The method of claim 11 , wherein the polyethylene in the nanocomposite film has a density in a range of from 0.9 to 0.99 g/cm 3 .

7 . The method of claim 11 , wherein the TiO 2 particles in the nanocomposite film have an average longest dimension of no more than 25 nm, and/or
wherein the TiO 2 particles have an average sphericity of at least 0.91.

8 . The method of claim 11 , wherein the polyethylene in the nanocomposite film is foamed.

9 . The method of claim 11 , wherein the nanocomposite film comprises no more than 2 wt. % of the silver particles.

10 . (canceled)

11 . A method for making a nanocomposite film, the method comprising:
dispersing and thereby mixing polyethylene, silver particles, and TiO 2 particles in a solvent to form a dispersion; drying to form a dry mixture; and melt mixing the dry mixture to form the nanocomposite film; wherein the nanocomposite film comprises: an organic matrix comprising at least 75 wt. % of the polyethylene relative to a total weight of the organic matrix; the silver particles; and the TiO 2 particles, wherein the silver particles and the TiO 2 particles are distributed within and/or on an outer surface of the organic matrix, wherein the silver particles have a size of 1 to 1,000 nm, and wherein the TiO 2 particles have a size of 1 to 50 nm.

12 . The method of claim 11 , further comprising, prior to the dispersing:
suspending the polyethylene in a first solvent for at least 5 minutes.

13 . The method of claim 12 , wherein the suspending of the polyethylene takes place for up to 12 hours.

14 . The method of claim 12 , wherein the first solvent comprises an alcohol.

15 . The method of claim 12 , wherein the first solvent comprises at least 75 wt. % of methanol, based on total solvent weight.

16 . The method of claim 11 , further comprising, prior to the dispersing:
forming the silver particles in situ by reducing a silver precursor with a reducing agent.

17 . The method of claim 11 , wherein the melt mixing comprises heating at a temperature in a range of 10% of a melting point of the polyethylene, and/or wherein the melt mixing comprises heating at a temperature in a range of from 100 to 115° C.

18 - 20 . (canceled)

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Salama Khaled Fikry
• Al Thumari Arwa Abdulrahman

Classifications

• A61L31/088 Primary

  Other specific inorganic materials not covered by A61L31/084 or A61L31/086 · CPC title

• A61L31/028

  Other inorganic materials not covered by A61L31/022 - A61L31/026 · CPC title

• A61L31/124

  of other specific inorganic materials not covered by A61L31/122 or A61L31/123 · CPC title

• A61L31/16

  Biologically active materials, e.g. therapeutic substances {(A61L31/047 takes precedence)} · CPC title

• A61L2420/08

  Coatings comprising two or more layers · CPC title