Composite nanoparticles including a thiol-substituted silicone

Patent metadata

Field	Value
Publication number	US-2016376498-A1
Application number	US-201515108885-A
Country	US
Kind code	A1
Filing date	Mar 2, 2015
Priority date	Mar 10, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

A composite particle that includes: a fluorescent semiconductor core/shell nanoparticle (preferably, nanocrystal); and a thiol-substituted silicone ligand.

First claim

1 . A composite particle comprising a fluorescent core/shell nanoparticle and a thiol-functional silicone ligand bound to the surface of the nanoparticle of the formula:

wherein
each R 1 is independently an alkyl or aryl;
R SH is a thiol-substituted (hetero)hydrocarbyl group;
n is 0 to 2000;
m may be zero;
n+m is at least one;
R 5 is alkyl, aryl or R SH ;
wherein thiol-functional silicone has at least one terminal R SH group.

2 . The composite particle of claim 1 where m is at least 1.

3 . The composite particle of claim 2 where the ratio of n to m is 10:90 to 98:2.

4 . The composite particle of claim 1 where R SH is an alkylene or arylene group.

5 . The composite particle of claim 1 where R SH is a heteroalkylene group.

6 . The composite particle of claim 4 where R SH is —C n H 2n —SH, where n is 1 to 10.

7 . The thiol-functional silicone ligand of claim 1 having M w ≧200, and ≦50,000

8 . The thiol-functional silicone ligand of claim 1 having M w ≧400 and ≦10,000)

9 . The thiol-functional silicone ligand of claim 1 having viscosity of at least 25 cSt, and no more than 50,000 cSt (preferred 50-10,000 cSt).

10 . The composite particle of claim 1 wherein the core comprises InP, CdS or CdSe.

11 . The composite particle of claim 1 wherein the shell comprises a magnesium or zinc-containing compound.

12 . The composite particle of claim 2 wherein the shell is a multilayered shell.

13 . The composite particle of claim 12 wherein the multilayered shell comprises an inner shell overcoating the core, wherein the inner shell comprises zinc selenide and zinc sulfide.

14 . The composite particle of claim 12 wherein the multilayered shell comprises an outer shell overcoating the inner shell, wherein the outer shell comprises zinc sulfide or MgS.

15 . A composite particle comprising:
a fluorescent semiconductor core/shell nanoparticle comprising: an InP core; an inner shell overcoating the core, wherein the inner shell comprises zinc selenide and zinc sulfide; and an outer shell overcoating the inner shell, wherein the outer shell comprises zinc sulfide; and the thiol-functional silicone ligand of claim 1 .

16 . A composition comprising the composite particle of claim 1 and a polymeric binder.

17 . The composition of claim 16 wherein the binder comprises a (meth)acrylated oligomer.

18 . The composition of claim 17 wherein the binder further comprises a reactive diluent monomer.

19 . The composition of claim 16 wherein the (meth)acrylated oligomer is of the general formula:
R Olig -(L 1 -Z 1 ) d ,
wherein
R Olig groups include urethanes, polyurethanes, esters, polyesters, polyethers, polyolefins, polybutadienes and epoxies;
L 1 is a linking group;
Z 1 is a pendent, free-radically polymerizable group such as (meth)acryloyl, vinyl or alkynyl and is preferably a (meth)acrylate, and
d is greater than 1, preferably at least 2.

20 . An article comprising the composite particle of claim 1 uniformly dispersed in the cured polymeric matrix binder between two barrier films.

Assignees

• 3M Innovative Properties Co

Inventors

• Qiu Zai-Ming

Classifications

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title

• C09K11/883

  with zinc or cadmium · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C09K11/565

  with zinc cadmium · CPC title

• C09K11/70

  containing phosphorus · CPC title