Encapsulant film

Patent metadata

Field	Value
Publication number	US-9732170-B2
Application number	US-201314655015-A
Country	US
Kind code	B2
Filing date	Dec 24, 2013
Priority date	Dec 24, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An encapsulant film and an optoelectronic device are provided. The encapsulant film having improved thermal resistance, and excellent adhesion, especially, long-term adhesive properties, to a front substrate and a back sheet can be provided. Also, the optoelectronic device capable of maintaining excellent workability and economic feasibility upon manufacture of the device without causing a negative influence on working environments and parts such as optoelectronic elements or wiring electrodes encapsulated by the encapsulant film can be provided.

First claim

The invention claimed is:

1. An encapsulant film having a ratio (S a /S m ) of 0.6 or more, of a peak area (S a ) of silanol groups and amine groups in a wavenumber range of 3,100 cm −1 to 3,600 cm −1 to a peak area (S m ) of methylene groups in a wavenumber range of 705 cm −1 to 735 cm −1 , as measured by FT-IR using an attenuated total reflection (ATR) method, and comprising a copolymer which is formed from a composition comprising:
an olefin resin;
an unsaturated silane compound; and
an aminosilane compound,
wherein the aminosilane compound is included in an amount of 1 to 40 parts by weight with respect to 100 parts by weight of the silane compound in the composition.

2. The encapsulant film of claim 1 , wherein the ratio (S a /S m ) of the peak area (S a ) of the silanol groups and amine groups to the peak area (S m ) of the methylene groups is 0.9 or more.

3. The encapsulant film of claim 1 , which satisfies the following Equation 1:
P=α 1 ( T L −100)+β 1   [Equation 1]

wherein P represents a peel strength of an encapsulant to a glass substrate as measured at a peel angle of 90° and a peel rate of 50 mm/min;
T L represents a lamination temperature of the encapsulant and the glass substrate;
α 1 is greater than or equal to 1; and
β 1 is greater than or equal to 40.

4. The encapsulant film of claim 3 , wherein α 1 is in a range of 1.5 to 4, and β 1 is in a range of 50 to 150.

5. The encapsulant film of claim 3 , wherein α 1 is in a range of 2.3 to 3.3, and β 1 is in a range of 70 to 130.

6. The encapsulant film of claim 1 , wherein the peel strength of the encapsulant film to the glass substrate is greater than or equal to 50 N/15 mm, as measured at a peel angle of 90° and a peel rate of 50 mm/min after the encapsulant film is laminated on the glass substrate at a temperature of 110° C.

7. The encapsulant film of claim 1 , wherein a yellowness index (YI) value is in a range of 0.5 to 2.5, as calculated by measuring a reflectance in a wavelength region of 400 nm to 700 nm using a UV/Vis spectrometer according to the ASTM D1925 standard and applying the reflectance to the following Equation 2:
YI=[ 100(1.28 X CIE −1.06 Z CIE )]/ Y CIE   [Equation 2]

wherein YI is a value calculated by a UV/Vis spectrometer using a color difference analysis program, and X CIE , Y CIE and Z CIE are relative values represented by red, green, and blue color coordinates, respectively.

8. The encapsulant film of claim 7 , wherein the yellowness index (YI) value is in a range of 1.0 to 1.5.

9. The encapsulant film of claim 1 , wherein the copolymer comprises:
a main chain comprising a polymerization unit of an olefin-based monomer; and
a branched chain bound to the main chain and represented by the following Formula 1:
—SiR 1 l R 2 (2-l) R 3   [Formula 1]

wherein R 1 and R 2 each independently represent a halogen, an amine group, —R 4 R 5 , or —R 5 bound to a silicon atom;
R 4 represents oxygen, or a sulfur atom;
R 5 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group;
1 is an integer of 1 or 2;
R 3 represents —OSiR 6 m R 7 (2-m) R 8 bound to a silicon atom;
R 6 and R 7 each independently represent a halogen, an amine group, —R 9 R 10 , or —R 10 bound to a silicon atom;
R 9 represents oxygen, or a sulfur atom;
R 10 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group;
R 8 represents —(CH 2 ) n NR 11 R 12 bound to a silicon atom;
R 11 and R 12 each independently represent a halogen or R 13 NH 2 bound to a silicon atom;
R 13 represents alkylene group;
m is an integer of 1 or 2; and
n is an integer greater than or equal to 0.

10. The encapsulant film of claim 9 , wherein R 1 and R 2 each independently represent a hydroxyl group;
R 3 represents —OSiR 6 m R 7 (2-m) R 8 bound to the silicon atom;
R 6 and R 7 each independently represent a hydroxyl group;
R 8 represents —(CH 2 ) n NR 11 R 12 bound to the silicon atom;
R 11 represents hydrogen;
R 12 represents R 13 NH 2 ; and
R 13 represents alkylene group.

11. The encapsulant film of claim 9 , wherein the copolymer further comprises a branched chain bound to the main chain and represented by the following Formula 2:
—SiR 14 o R 15 ( 3-o )  [Formula 2]

wherein R 14 and R 15 each independently represent a halogen, an amine group, —R 16 R 17 , or —R 17 bound to a silicon atom;
R 16 represents oxygen, or a sulfur atom;
R 17 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group; and
o is an integer ranging from 1 to 3.

12. The encapsulant film of claim 11 , wherein R 14 and R 15 each independently represent a hydroxyl group or —R 16 R 17 bound to a silicon atom;
R 16 represents oxygen; and
R 17 represents an alkyl group.

13. An optoelectronic device comprising:
a front substrate;
a back sheet;
the encapsulant film stacked between the front substrate and the back sheet as defined in claim 1 ; and
an optoelectronic element encapsulated by the encapsulant film.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Hyo Ju
• Lee Choong Hoon
• Choi Sung Ho
• Woo Ji Yoon
• Gong Jin Sam

Classifications

• H10W74/476

  Organic materials comprising silicon · CPC title

• H10W74/40

  characterised by their materials · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C09D143/04

  Homopolymers or copolymers of monomers containing silicon · CPC title

• C08F230/08

  containing silicon · CPC title