IP Library › Granted Patent US 12674039
Granted Patent B2
US 12674039 · App. 17/631,612 · Granted Jul 7, 2026

Storage stable epoxy resin composition

Inventors: Dominik Zgela (Truchtlaching, DE); Peter Dijkink (Garching, DE); Florian Ritzinger (Garching, DE); Maximilian Hartl (Marquartstein, DE); Monika Sax (Engelsberg, DE)
Assignee: Alzchem Trostberg GmbH
C08K5/55C08G59/44
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Quick Facts
Patent No.
US 12674039
App. No.
17/631,612
Granted
Jul 7, 2026
Kind
B2
Abstract

The present invention relates to the use of boronic acids to increase the storage stability of epoxy resin compositions and epoxy resin compositions comprising an epoxy resin, a curing agent, a curing accelerator and a boronic acid.

Claims (25)

1 . An epoxy resin composition comprising at least one epoxy resin and a curing agent for curing the epoxy resin and a curing accelerator for accelerating curing of the epoxy resin, wherein the composition comprises at least one boronic acid of the general formula (I), wherein formula (I) represents:

wherein radical R 1 means:

R 1 =alkyl, hydroxyalkyl or a radical of formula (II), wherein formula (II) is:

wherein R 2 , R 3 , R 4 independently of one another mean and at least one radical R 2 , R 3 , R 4 is not hydrogen:

R 2 , R 3 , R 4 =hydrogen, fluorine, chlorine, bromine, iodine, cyano, C 1 to C 5 alkyl, alkoxy, acyl, alkylsulfonyl, aryl, carboxyl or B(OH) 2 ,

wherein the epoxy resin composition comprises, as a curing accelerator, a curing accelerator according to formula (IV), wherein formula (IV) is:

wherein R 6 , R 7 , R 8 independently of one another mean:

R 6 , R 7 =independently of one another hydrogen or C 1 to C 5 alkyl,

R 8 =hydrogen, C 1 to C 15 alkyl, C 3 to C 15 cycloalkyl, aryl, alkylaryl,

C 1 to C 15 alkyl substituted with —NHC(O)NR 6 R 7 ,

C 3 to C 15 cycloalkyl substituted with —NHC(O)NR 6 R 7 ,

aryl substituted with —NHC(O)NR 6 R 7 or

alkylaryl substituted with —NHC(O) NR 6 R 7 ; and

wherein the epoxy resin composition comprises a curing agent according to general formula (III), wherein formula (III) is

wherein radicals R 40 , R 41 , R 42 independently of one another mean:

R 40 =cyano, nitro, acyl or a radical of the formula —(C═X)—R 43 , with

X=imino or oxygen,

R 43 =amino, alkylamino or alkoxy,

R 41 =hydrogen, C 1 to C 5 alkyl, aryl or acyl,

R 42 =hydrogen or C 1 to C 5 alkyl;

wherein the epoxy resin composition based on 100 parts by weight of epoxy resin comprises:

a) 1 to 15 parts by weight of curing agent,

b) 0.1 to 9 parts by weight of curing accelerator, and

c) 0.05 to 3.0 parts by weight of boronic acid according to formula (I).

2 . Epoxy resin composition according to claim 1 , wherein the weight ratio of curing agent to boronic acid corresponds to a ratio in the range of 1:1 to 240:1, and/or the weight ratio of curing accelerator to boronic acid corresponds to a ratio in the range of 0.05:1 to 160:1.