Granted Patent B2

US 12,674,039 · App. 17/631,612 · Granted Jul 7, 2026

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

Abstract

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.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (22)