Storage stable epoxy resin composition

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 R1 means:
• R1=alkyl, hydroxyalkyl or a radical of formula (II), wherein formula (II) is:
• wherein R2, R3, R4 independently of one another mean and at least one radical R2, R3, R4 is not hydrogen:
• R2, R3, R4=hydrogen, fluorine, chlorine, bromine, iodine, cyano, C1 to C5 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 R6, R7, R8 independently of one another mean:
• R6, R7=independently of one another hydrogen or C1 to C5 alkyl,
• R8=hydrogen, C1 to C15 alkyl, C3 to C15 cycloalkyl, aryl, alkylaryl,
• C1 to C15 alkyl substituted with —NHC(O)NR6R7,
• C3 to C15 cycloalkyl substituted with —NHC(O)NR6R7,
• aryl substituted with —NHC(O)NR6R7 or
• alkylaryl substituted with —NHC(O) NR6R7;
• and
• wherein the epoxy resin composition comprises a curing agent according to general formula (III), wherein formula (III) is
• wherein radicals R40, R41, R42 independently of one another mean:
• R40=cyano, nitro, acyl or a radical of the formula —(C═X)—R43, with
• X=imino or oxygen,
• R43=amino, alkylamino or alkoxy,
• R41=hydrogen, C1 to C5 alkyl, aryl or acyl,
• R42=hydrogen or C1 to C5 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).