Nanocomposite composition comprising transparent nanoparticles

• US 7,834,083 B2
• Filed: 05/14/2007
• Issued: 11/16/2010
• Est. Priority Date: 10/11/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Choi, Seong Jae, Choi, Jae Young, Yoon, Seon Mi, Shin, Hyeon Jin
• Primary Examiner(s): Gulakowski; Randy
• Assistant Examiner(s): LOEWE, ROBERT S
• Application Number:
  US11/748,345
• Publication Number:
  US 20080090947A1
• Time in Patent Office: 1,282 Days
• Field of Search: 524/588
• US Class Current: 524/588
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08G 77/14 containing silicon bound to oxygen-containing groups C08G77/045 takes precedence
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 5/005 Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials
• CPC Class Codes: C08K 2003/2244 of zirconium
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 5/54 Silicon-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08K 5/5406 containing elements other than oxygen or nitrogen
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C08L 83/06 containing silicon bound to oxygen-containing groups C08L83/12 takes precedence

Abstract

Disclosed is a nanocomposite composition, comprising transparent nanoparticles, a matrix polymer including a polydimethylsiloxane resin and an epoxy group-containing polydimethylsiloxane resin, and a siloxane dispersant including a head part having an affinity for the transparent nanoparticles and a tail part having an affinity for the polydimethylsiloxane resin. The nanocomposite composition of this invention can be effectively used in the encapsulation layer of a light emitting diode or in an optical film.

Claims

1. A nanocomposite composition, comprising:

phosphors, optically transparent nanoparticles, a matrix polymer including a polydimethylsiloxane resin and an epoxy group-containing polydimethylsiloxane resin, and a siloxane dispersant including a head part having an affinity for the nanoparticles and a tail part having an affinity for the polydimethylsiloxane resin.

2. The composition as set forth in claim 1, which comprises about 1 to about 50 volume percent of the nanoparticles, and about 0.1 to about 5 volume percent of the siloxane dispersant based on the volume of the nanoparticles, with a balance of the matrix polymer.

3. The composition as set forth in claim 2, wherein the matrix polymer comprises about 75 to about 88 volume percent of the polydimethylsiloxane resin and about 12 to about 25 volume percent of the epoxy group-containing polydimethylsiloxane resin.

4. The composition as set forth in claim 1, wherein the nanoparticles have a refractive index of 1.4 or more.

5. The composition as set forth in claim 1, wherein the nanoparticles have an optical transparency of 80% or more.

6. The composition as set forth in any one of claims 1 to 5, wherein the nanoparticles are selected from a group consisting of zirconia (ZrO₂), titania (TiO₂), and zinc sulfide (ZnS).

7. The composition as set forth in claim 1, wherein the siloxane dispersant comprises the head part selected from a group represented by Formula 1 or 2 below and the tail part selected from a group represented by Formula 3 below:

8. The composition as set forth in claim 7, wherein the dispersant is any one compound selected from a group represented by Formulas 4 to 28 below:

9. The composition as set forth in claim 1, wherein the epoxy group-containing polydimethylsiloxane resin is represented by Formula 29 below:

10. An encapsulation layer of a light emitting diode, formed using the nanocomposite composition of claim 1.

11. An optical film, formed using the nanocomposite composition of claim 1.

12. A method comprising:

blending phosphors, optically transparent nanoparticles, a matrix polymer that comprises a polydimethylsiloxane resin and an epoxy group-containing resin, and a siloxane dispersant including a head part having an affinity for the nanoparticles and a tail part having an affinity for the polydimethylsiloxane resin;

reacting the head part to the nanoparticles; and

reacting the tail part to the polydimethylsiloxane resin.

13. A method of manufacturing a light emitting diode comprising:

preparing a light emitting diode chip;

disposing on the light emitting diode chip a nanocomposite composition comprising a phosphor, optically transparent nanoparticles, a matrix polymer that comprises a polydimethylsiloxane resin and an epoxy group-containing resin, and a siloxane dispersant including a head part having an affinity for the nanoparticles and a tail part having an affinity for the polydimethylsiloxane resin;

reacting the head part to the nanoparticles; and

reacting the tail part to the polydimethylsiloxane resin; and

curing the nanocomposite composition.