Weather-resistant epoxy resin system

A curable epoxy resin composition comprising

• (a) a cycloaliphatic diglycidyl compound as epoxy resin, and
• (b) an antioxidant (b1) alone or a combination of an antioxidant (b1) and an UV absorber (b2), characterized in that the antioxidant (b1) is a compound of the general formula (I)
• wherein R1=═—H, —OH, —O—C1-18 alkyl, —C1-18 alkyl, —C5-12 cycloalkyl being unsubstituted or being substituted with C1-6 alkyl or C1-6 alkoxy, or —CH2—C5-12 cycloalkyl being unsubstituted or substituted with C1-6 alkyl or C1-6 alkoxy;
• R2,3,4,5=independent from each other —C1-6 alkyl;
• and
• R6=a bivalent aliphatic, cycloaliphatic or aromatic residue, and
• wherein the weight ratio between components (a) and (b) is from 90.0:10.0 to 98.5:1.5,
• with the proviso that the weight portion of the component (b1) is at least 0.5.

A method of producing a cross-linked product comprising curing a composition comprising:

• (a) a cycloaliphatic diglycidyl compound as epoxy resin,
• (b) an antioxidant (b1) alone or a combination of an antioxidant (b1) and an UV absorber (b2), characterized in that the antioxidant (b1) is a compound of the general formula (I)
• wherein R1═—H, —OH, —O—C1-18 alkyl, C1-18 alkyl, —C5-12 cycloalkyl being unsubstituted or being substituted with C1-6 alkyl or C1-6 alkoxy, or —CH2—C5-12 cycloalkyl being unsubstituted or substituted with C1-6 alkyl or C1-6 alkoxy;
• R2,3,4,5=independent from each other C1-6 alkyl;
• and
• R6=a bivalent aliphatic, cycloaliphatic or aromatic residue, and
• (c) a curing agent,
• wherein the weight ratio between components (a) and (b) is from 90.0:10.0 to 98.5:1.5,
• with the proviso that the weight portion of the component (b1) is at least 0.5.

An electrical insulation material obtained by curing a composition comprising:

• (a) a cycloaliphatic diglycidyl compound as epoxy resin, and
• (b) an antioxidant (b1) alone or a combination of an antioxidant (b1) and an UV absorber (b2), characterized in that the antioxidant (b1) is a compound of the general formula (I)
• wherein R1═—H, —OH, —O—C1-18 alkyl, —C1-18 alkyl, —C5-12 cycloalkyl being unsubstituted or being substituted with C1-6 alkyl or C1-6 alkoxy, or —CH2—C5-12 cycloalkyl being unsubstituted or substituted with C1-6 alkyl or C1-6 alkoxy;
• R2,3,4,5=independent from each other C1-6 alkyl;
• and
• R6=a bivalent aliphatic, cycloaliphatic or aromatic residue, and
• wherein the weight ratio between components (a) and (b) is from 90.0:10.0 to 98.5:1.5,
• with the proviso that the weight portion of the component (b1) is at least 0.5.