Dispersion for Simple Use in The Production of Encapsulation Films

Patent metadata

Field	Value
Publication number	US-2016177015-A1
Application number	US-201514974814-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A dispersion (D) contains (i) at least one polyolefin copolymer (I) as continuous phase; and (ii) at least one (meth)acrylamide compound dispersed in the polyolefin copolymer (I). The dispersion (D) is used for the production of a film for encapsulation of an electronic device, especially a solar cell.

First claim

1 . A dispersion (D), comprising:
(i) at least one polyolefin copolymer (I) as continuous phase; and (ii) at least one compound dispersed in the polyolefin copolymer (I) and having the chemical structure (II) with

wherein
R 1 , R 2 are each independently hydrogen or methyl;
A is selected from the group consisting of the following a, b and c)
a) an unbranched or branched alkylene group which has 1 to 20 carbon atoms and in which at least one hydrogen radical may be replaced by a halogen radical and in which one or two hydrogen radicals may each be replaced by a radical selected from the group consisting of —OR 3 , and —C(═O)NR 4 R 5 ,
b) arylene group which has 6 to 14 carbon atoms and in which at least one hydrogen radical may be replaced by a halogen radical or an alkyl radical having 1 to 10 carbon atoms and in which one or two hydrogen radicals may each be replaced by a radical selected from the group consisting of —OR 6 , and —C(═O)NR 7 R 8 , and
c) a bridging radical of the chemical structure -A 1 -X-A 2 -;
wherein R 3 , R 4 , R 5 , R 6 , R 7 , R 8 are each independently selected from the group consisting of hydrogen, and a branched or unbranched alkyl radical having 1 to 10 carbon atoms;
wherein A 1 , A 2 are each independently a branched or unbranched alkylene group having 1 to 10 carbon atoms;
and wherein X is selected from the group consisting of —O—, —S—S—, —S—, and —NR 9 — with R 9 =alkyl radical having 1 to 10 carbon atoms.

2 . The dispersion (D) according to claim 1 , wherein R 1 ═R 2 =hydrogen and A=—CH 2 —.

3 . The dispersion (D) according to claim 1 , in which the proportion of all compounds of the chemical structure (II) based on a total weight of all polyolefin copolymers (I) in the dispersion (D) is in the range from 0.1% to 25% by weight.

4 . The dispersion (D) according to claim 1 , wherein the polyolefin copolymer (I) is an ethylene-vinyl acetate copolymer.

5 . The dispersion (D) according to claim 1 , wherein the polyolefin copolymer (I) is in the solid state of matter.

6 . The dispersion (D) according to claim 5 , in which the dispersed compound of the chemical structure (II) is present in particles, wherein at least 50% of all the particles of the chemical structure (II) in the dispersion (D) have a particle size of ≦100 μm.

7 . The dispersion (D) according to claim 6 , in which the dispersed compound of the chemical structure (II) is present in particles, wherein all the particles have a particle size of <1 mm.

8 . A film for encapsulation of an electronic device, comprising:
the dispersion (D) according to claim 1 in crosslinked form.

9 . The film according to claim 8 , wherein the device is a solar cell.

10 . A method for encapsulating an electronic device, comprising:
contacting said electronic device with the dispersion (D) of claim 1 and crosslinking said dispersion (D).

11 . The method according to claim 10 , wherein the device is a solar cell.

12 . The method according to claim 11 , wherein the crosslinking of the dispersion (D) occurs in the course of solar module lamination.

13 . A process for producing a film for encapsulation of an electronic device, comprising
(a) mixing the dispersion (D) according to claim 1 with additional polyolefin copolymer (I) to give a mixture; (b) extruding the mixture obtained in step (a) to give a film.

14 . The process according to claim 9 , wherein additives selected from the group consisting of initiators, further crosslinkers, silane coupling agents, antioxidants, ageing stabilizers, metal oxides, metal hydroxides, and white pigments are added in step (a).

15 . A process for producing a dispersion (D), comprising:
(a) providing a polyolefin copolymer (I); (b) adding at least one pulverulent compound of the chemical structure (II) to the polyolefin copolymer (I) with

wherein
R 1 , R 2 are each independently hydrogen or methyl;
A is selected from the group consisting of the following a, b and c)
a) an unbranched or branched alkylene group which has 1 to 20 carbon atoms and in which at least one hydrogen radical may be replaced by a halogen radical and in which one or two hydrogen radicals may each be replaced by a radical selected from the group consisting of —OR 3 , and —C(═O)NR 4 R 5 ,
b) arylene group which has 6 to 14 carbon atoms and in which at least one hydrogen radical may be replaced by a halogen radical or an alkyl radical having 1 to 10 carbon atoms and in which one or two hydrogen radicals may each be replaced by a radical selected from the group consisting of —OR 6 , and —C(═O)NR 7 R 8 , and
c) a bridging radical of the chemical structure -A 1 -X-A 2 -;
wherein R 3 , R 4 , R 5 , R 6 , R 7 , R 8 are each independently selected from the group consisting of hydrogen, and a branched or unbranched alkyl radical having 1 to 10 carbon atoms;
wherein A 1 , A 2 are each independently a branched or unbranched alkylene group having 1 to 10 carbon atoms;

and wherein X is selected from the group consisting of —O—, —S—S—, —S—, and —NR 9 — with R 9 =alkyl radical having 1 to 10 carbon atoms;
(c) incorporating the compound of the chemical structure (II) into the polyolefin copolymer (I).

16 . The process according to claim 15 , wherein R 1 ═R 2 =hydrogen and A=—CH 2 —.

17 . The process according to claim 15 , wherein the polyolefin copolymer (I) is an ethylene-vinyl acetate copolymer.

18 . The process according to claim 15 , wherein at least 50% of all the particles encompassed by the pulverulent compound of the chemical structure (II) have a particle size of ≦500 μm, determined according to DIN/ISO 13320.

19 . A dispersion (D) obtained by the process according to claim 15 .

20 . A film for encapsulation of an electronic device, comprising:
the dispersion (D) according to claim 19 in crosslinked form.

21 . The film according to claim 20 , wherein the device is a solar cell.

22 . A process for producing a film for encapsulation of an electronic device, comprising
(a) mixing the dispersion (D) according to claim 19 with additional polyolefin copolymer (I) to give a mixture; (b) extruding the mixture obtained in step (a) to give a film.

23 . The process according to claim 22 , wherein additives selected from the group consisting of initiators, further crosslinkers, silane coupling agents, antioxidants, ageing stabilizers, metal oxides, metal hydroxides, and white pigments are added in step (a).

Assignees

• Ulbricht Daniel
• Hein Marcel
• Kleff Frank
• Schauhoff Stephanie
• Ohlemacher Juergen
• Evonik Degussa Gmbh

Inventors

• Ulbricht Daniel
• Hein Marcel
• Kleff Frank
• Schauhoff Stephanie
• Ohlemacher Juergen

Classifications

• H10F77/50

  Encapsulations or containers (for photovoltaic modules H10F19/80) · CPC title

• H10F19/804

  Materials of encapsulations · CPC title

• C08F255/026 Primary

  on to ethylene-vinylester copolymers · CPC title

• C08K5/14

  Peroxides · CPC title

• C08K5/5425

  containing at least one C=C bond · CPC title