Hardeners for cold-curing epoxy systems

Patent metadata

Field	Value
Publication number	US-10160826-B2
Application number	US-201414763951-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Mar 15, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A hardener composition comprising: a) an isolated adduct comprising a reaction product of i) a polymer with a functionality of at least three, wherein said polymer contains at least one epoxy group; and ii) an amine wherein the isolated adduct is present as an aqueous solution; and b) a capping agent. This hardener can be used with a liquid epoxy resin to form a curable composition.

First claim

That which claimed is:

1. A hardener composition comprising:
a) an aqueous solution of an isolated adduct;
b) a capping agent; and
c) a modifier consisting of benzyl alcohol;
wherein said isolated adduct is a reaction product of: i) an aliphatic polymer with a functionality of at least three and containing at least one epoxy group; and ii) a polyamine;
wherein at least one of said capping agent b) and said modifier c) is present in an amount of from 0.05 weight percent to 5 weight percent, based on the total weight of the hardener composition.

2. A hardener composition in accordance with claim 1 wherein said polyamine ii) is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine, m-xylylenediamine, methylpentamethylenediamine, 1,3-BAC and combinations thereof.

3. A hardener composition in accordance with claim 1 wherein said capping agent b) is selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, phenyl glycidyl ether, cresyl glycidyl ether, p.t-butylphenyl glycidyl ether, C12/C14 fatty alcohol glycidyl ether, and formaldehyde.

4. A hardener composition in accordance with claim 1 wherein said aliphatic polymer i) accounts for 30 weight percent to 95 weight percent of the isolated adduct, and said polyamine ii) accounts for 5 weight percent to 70 weight percent of the isolated adduct, based on the total weight of the isolated adduct.

5. A hardener composition in accordance with claim 1 wherein said isolated adduct is present in an amount of from 5 weight percent to 95 weight percent, based on the total weight of the hardener composition.

6. The hardener composition in accordance with claim 1 , wherein said modifier c) is present in an amount of from 0.05 weight percent to 5 weight percent, based on the total weight of the hardener composition.

7. The hardener composition in accordance with claim 1 , wherein said capping agent b) is present in an amount of from 0.05 weight percent to 5 weight percent, based on the total weight of the hardener composition.

8. A curable composition comprising:
i) the hardener composition of claim 1 ; and
ii) an epoxy resin selected from the group consisting of liquid bisphenol-A diglycidyl ethers, liquid bisphenol-F diglycidyl ethers, liquid epoxy novolacs, solid bisphenol-A epoxy resins, and combinations thereof.

9. A coating prepared from the composition of claim 8 .

10. A primer prepared from the composition of claim 8 .

11. A process for preparing the hardener composition of claim 1 comprising:
contacting said aliphatic polymer i) and a molar excess of said polyamine ii) under reaction conditions to form an adduct;
distilling excess polyamine to form said isolated adduct;
adding water to form said aqueous solution of an isolated adduct a);
admixing said aqueous solution of an isolated adduct a) with said capping agent b); and
adding said modifier consisting of benzyl alcohol c);
wherein at least one of said capping agent b) and said modifier c) is present in an amount of from 0.05 weight percent to 5 weight percent, based on the total weight of the hardener composition.

12. A process in accordance with claim 11 wherein said reaction conditions comprise a reaction temperature in the range of from 60° C. to 140° C.

Assignees

• Dow Global Technologies Llc

Inventors

• Schroetz Markus
• Huelskaemper Ludwig
• Pfarherr Marcus
• Dobler Sabine
• Wiedmann Carmen

Classifications

• C08G59/184 Primary

  with amines · CPC title

• C09D163/00

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D163/04

  Epoxynovolacs · CPC title