Stable quantum dot compositions

Patent metadata

Field	Value
Publication number	US-11643594-B2
Application number	US-201917286658-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Oct 22, 2018
Publication date	May 9, 2023
Grant date	May 9, 2023

Abstract

A nano-composite includes a thermoplastic copolymer includes a polycarbonate copolymer including repeating siloxane units and a plurality of quantum dots. A method of making a polymer film includes forming a masterbatch composition by combining (1) a first thermoplastic copolymer including a polycarbonate copolymer including repeating siloxane units and (2) a plurality of quantum dots; combining the masterbatch composition with a second thermoplastic polymer to form a mixture; and forming the polymer film from the mixture. The polycarbonate copolymer has a siloxane content of from 15 wt % to 65 wt %.

First claim

The invention claimed is:

1. A method of making a polymer film, comprising:
forming a masterbatch composition by combining (1) a first thermoplastic copolymer comprising a polycarbonate copolymer comprising repeating siloxane units and (2) a plurality of quantum dots;
combining the masterbatch composition with a second thermoplastic polymer to form a mixture; and
forming the polymer film from the mixture,
wherein the polycarbonate copolymer has a siloxane content of from 30 wt % to 50 wt %.

2. The method of claim 1 , wherein the masterbatch composition comprises from 90 wt % to 99.9 wt % of the first thermoplastic copolymer and from 0.1 wt % to 10 wt % of the plurality of quantum dots.

3. The method of claim 1 , wherein:
the plurality of quantum dots are concentration-gradient quantum dots;
the plurality of quantum dots comprise a passivation layer; or
the plurality of quantum dots comprise surface ligands.

4. The method of claim 1 , wherein the polycarbonate copolymer has a siloxane content of from 35 wt % to 45 wt %.

5. The method of claim 1 , wherein the second thermoplastic polymer comprises polycarbonate (PC), polycarbonate-siloxane copolymer, polysiloxane, cyclic olefin copolymer (COC), polyetherimide (PEI), poly(phenylene oxide) (PPO), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyaryletherketone (PAEK), polyimide, polyolefin, polystyrene, copolymers thereof, or a combination thereof.

6. The method of claim 1 , wherein the polymer film comprises:
from 0.5 wt % to 10 wt % of the polycarbonate copolymer comprising repeating siloxane units;
from 0.01 wt % to 2 wt % of the plurality of quantum dots; and
from 89 wt % to 99.49 wt % of the second thermoplastic polymer.

7. The method according to claim 1 , wherein the polycarbonate copolymer has a weight average molecular weight of 35,000 to 40,000 Da as measured by gel permeation chromatography using a crosslinked styrene-divinyl benzene column, at a sample concentration of 1 milligram per milliliter, and as calibrated with bisphenol A polycarbonate standards.

Assignees

• Shpp Global Tech Bv

Inventors

• Zhou Bing
• Hein Christopher Luke
• Zhou Hao

Classifications

• C08L83/10

  Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) · CPC title

• C08G77/448

  containing polycarbonate sequences · CPC title

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title

• C09K11/883 Primary

  with zinc or cadmium · CPC title

• C09K11/641

  Chalcogenides · CPC title