Adhesive for solar battery back sheets

Patent metadata

Field	Value
Publication number	US-9401445-B2
Application number	US-201414489843-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Mar 19, 2012
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

An adhesive for solar battery back sheets obtainable by mixing (A) a urethane prepolymer having an isocyanate group at the end with (B) a polyol, wherein the urethane prepolymer (A) is obtainable by a reaction of a hydroxyl group-containing compound with an isocyanate compound, and the hydroxyl group-containing compound comprises a polycaprolactone polyol. Also, cured reaction products of the adhesive. Also, a solar battery back sheet and a solar cell module comprising the adhesive.

First claim

What is claimed is:

1. A two component adhesive for solar battery back sheets comprising (A) a urethane prepolymer having an isocyanate group at the end, wherein the urethane prepolymer (A) is a reaction product of a hydroxyl group-containing compound comprising a polycaprolactone polyol with an isocyanate compound, and (B) a polyol having a glass transition temperature of −30° C. to 10° C.

2. The adhesive for solar battery back sheets according to claim 1 , wherein the urethane prepolymer (A) further comprises a trimer of an isocyanate compound.

3. The adhesive for solar battery back sheets according to claim 1 , wherein the urethane prepolymer (A) has an isocyanate index of 2.0 to 4.0.

4. The adhesive for solar battery back sheets according to claim 1 , wherein the hydroxyl group-containing compound further comprises trimethylolpropane.

5. The adhesive for solar battery back sheets according to claim 1 , the adhesive further comprises an epoxy resin.

6. The adhesive for solar battery back sheets according to claim 1 , wherein the polyol (B) has a glass transition temperature of −30° C. to 5° C.

7. A solar battery back sheet comprising the adhesive for solar battery back sheets according to claim 1 .

8. A solar battery module comprising the solar battery back sheets according to claim 7 .

9. A solar battery back sheet comprising cured reaction products of the adhesive of claim 1 .

10. Cured reaction products of the adhesive of claim 1 .

11. A two component adhesive for solar battery back sheets comprising (A) a urethane prepolymer having an isocyanate group at the end, wherein the urethane prepolymer (A) is a reaction product of a hydroxyl group-containing compound comprising a polycaprolactone polyol with an isocyanate compound, and (B) a polyol chosen from the group consisting of a polyesterpolyol or a polyacrylic polyol, the polyol (B) having a glass transition temperature of −30° C. to 10° C. wherein a curing reaction is initiated by mixing the urethane prepolymer (A) with the polyol (B).

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Matsuki Yuichi
• Kamai Noriyoshi
• Yamada Yasushi

Classifications

• C08G18/58 Primary

  Epoxy resins {(C08G18/42, C08G18/48 take precedence; reaction products of epoxy resins with at least equivalent amounts of compounds containing active hydrogen C08G18/6407, with at least equivalent amounts of amines C08G18/6415; polymeric products of isocyanates or isothiocyanates with epoxy compounds having no active hydrogen C08G18/003)} · CPC title

• H10F19/85

  Protective back sheets · CPC title

• H10F19/804 Primary

  Materials of encapsulations · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title