Process for manufacturing fiber-reinforced base materials for the electrical industry based on epoxy resin and imidazole-acrylic acid adduct curing agents
AssigneeSchering Corporation
InventorsChristian Burba, Werner Mrotzek
Life of this patent
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Abstract
The invention relates to a process for manufacturing fiber-reinforced boards for the electrical industry by the use of epoxy resins and latent curing agents based on imidazole/acrylic acid reaction products based on the general formula ##STR1## wherein R, R.sup.1 and R.sup.2 are, independently of one another, H or a short-chain alkyl group having from 1 to 3 carbon atoms, R.sup.3 is a group of the formula --O--(CH.sub.2)m--R.sub.4 (II) wherein m is an integer between 2 and 6, R.sup.4 is H, --OH or --O--, and n is equal to the valence of R.sup.3.
Claims7
A process for manufacturing fiber-reinforced base materials for the electrical industry comprising converting reinforcing materials impregnated with binder to the B stage by the use of pressure and heat, and subsequently curing said B stage reinforcing materials completely at elevated temperature, wherein said binder comprises a curable mixture of
- (a) an epoxy resin and
- (b) at least one curing agent of formula I ##STR7## wherein R, R.sup.1 and R.sup.2 are, independently of one another, H or a short-chain alkyl group having from 1 to 3 carbon atoms,
- R.sup.3 is a group of formula II
- --O-- (CH.sub.2 (.sub.m --R.sup.4 (II)
- wherein m is an integer between 2 and 6,R.sup.4 is H, --OH or and n is equal to the valence of R.sup.3, and a curing agent of the formula III ##STR8## wherein R.sup.1 and R.sup.2 have the meanings given above.
A process for manufacturing fiber-reinforced base materials for the electrical industry comprising converting reinforcing materials impregnated with binder to the B stage by the use of pressure and heat, and subsequently curing said B stage reinforcing materials completely at elevated temperature, wherein said binder comprises a curable mixture of
- (a) an epoxy resin and
- (b) at least one curing agent of formula I ##STR9## wherein R, R.sup.1 and R.sup.2 are, independently of one another, H or a short-chain alkyl group having from 1 to 3 carbon atoms,
- R.sup.3 is a group of formula II
- --O--(CH.sub.2).sub.m --R.sup.4 (II)
- wherein m is an integer between 2 and 6, R.sup.4 is H, --OH or --O-- and n is equal to the valence of R.sup.3, and a curing agent of the general formula IV ##STR10## wherein R.sup.5 is an optionally substituted aliphatic, cycloaliphatic, aromatic or araliphatic group and R.sup.6 and R.sup.7 are ##STR11## independently of one another, R.sup.1 and R.sup.2 having the meanings given above and R.sup.8 and R.sup.9 are, independently of one another, an optionally branched alkyl group having from 1 to 4 carbon atoms.
A process for manufacturing fiber-reinforced base materials for the electrical industry comprising converting reinforcing materials impregnated with binder to the B stage by the use of pressure and heat, and subsequently curing said B stage reinforcing materials completely at elevated temperature, wherein said binder comprises a curable mixture of
- (a) an epoxy resin and
- (b) at least one curing agent of formula I ##STR12## wherein R, R.sup.1 and R.sup.2 are, independently of one another, H or a short-chain alkyl group having from 1 to 3 carbon atoms,
- R.sup.3 is a group of formula II
- --O-- (CH.sub.2).sub.m --R.sup.4 (II)
- wherein m is an integer between 2 and 6, R.sup.4 is H, --OH or --O-- and n is equal to the valence of R.sup.3, and a curing agent of formula III ##STR13## wherein R.sup.1 and R.sup.2 have the meanings given above, and a curing agent of formula IV ##STR14## wherein R.sup.5 is an optionally substituted aliphatic, cycloaliphatic, aromatic or araliphatic group and R.sup.6 and R.sup.7 are ##STR15## independently of one another, R.sup.1 and R.sup.2 having the meanings given above and R.sup.8 and R.sup.9 are, independently of one another, an optionally branched alkyl group having from 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.