Claims
- 1. A flame-retarded casting resin composition for electrical and electronic components consisting essentially of:
- A) an epoxy resin mixture consisting essentially of
- A1) 15-35% by weight of a liquid mixture of a bisphenol A diglycidyl ether, a bisphenol F diglycidyl ether and butane-1,4-diol diglycidyl ether,
- A2) 55-85% by weight of aluminum oxide trihydrate having a particle size of D.sub.50 20-25 .mu.m as determined by sieving,
- A3) 0-20% by weight of at least one further non-electrically conducting filler and
- A4) 0-5% by weight of at least one further additive, selected from the group consisting of dyes, pigments, plasticizers, antifoams, flow agents, mould release agents, thixotropic agents, antioxidants, light stabilizers and adhesion promoters
- B) at least one carboxylic acid anhydride
- or
- a cycloaliphatic diamine of the formula I or II ##STR4## in which the radicals R.sub.1 to R.sub.4 independently of one another are hydrogen or C.sub.1 -C.sub.4 alkyl and Z is a direct bond, --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --S--, --O--, --SO.sub.2 -- or --CO--, in an amount sufficient to cure component A, the content of components A2 and A3 together being 63-80% by weight, with respect to the total weight of components A and B and
- C) optionally at least one cure accelerator.
- 2. A casting resin composition according to claim 1, wherein component A is an epoxy resin mixture consisting of
- A1) 18-30% by weight of a mixture of a bisphenol A diglycidyl ether, a bisphenol F diglycidyl ether and butane-1,4-diol diglycidyl ether,
- A2) 60-80% by weight of aluminium oxide trihydrate having an average particle size of 20 to 25 .mu.m as determined by sieving,
- A3) 0-15% by weight of at least one further non-electrically conducting filler and
- A4) 0-3% by weight of at least one further additive selected from the group consisting of dyes, pigments, plasticizers, antifoams, flow agents, mould release agents, thixotropic agents, antioxidants, light stabilizers and adhesion promoters.
- 3. A composition according to claim 1, comprising, as component B, a carboxylic acid anhydride in an amount sufficient to cure component A.
- 4. A composition according to claim 1, in which the content of components A2 and A3 together is 63-70% by weight, with respect to the total weight of the composition.
- 5. A composition according to claim 1, comprising 100% by weight ground quartz as component A3.
- 6. A composition according to claim 1, comprising an adhesion promoter as component A4.
- 7. A composition according to claim 6, comprising .gamma.-glycidoxypropylmethoxysilane as adhesion promoter.
- 8. A composition according to claim 1, comprising a cycloaliphatic carboxylic acid anhydride as component B.
- 9. A composition according to claim 1, comprising, as component B, a cycloaliphatic diamine selected from the group consisting of 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, bis(4-aminocyclohexyl)methane and bis(4-amino-3-methylcyclohexyl)methane.
- 10. A composition according to claim 9, comprising, as component B, bis(4-aminocyclohexyl)methane or bis(4-amino-3-methylcyclohexyl)methane.
- 11. A composition according to claim 1, in which the component C content is 0.05-5% by weight, with respect to the total weight of the composition.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3470/91 |
Nov 1991 |
CHX |
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Parent Case Info
This application is a continuation, of application Ser. No. 08/158,842, filed Nov. 29, 1993, now abandoned which is a continuation of Ser. No. 07/979,957 filed Nov. 23, 1992, now abandoned.
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Foreign Referenced Citations (11)
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Date |
Country |
0038292 |
Oct 1981 |
EPX |
0191872 |
Aug 1986 |
EPX |
0385949 |
Sep 1990 |
EPX |
1476082 |
Apr 1967 |
FRX |
2052085 |
Apr 1971 |
FRX |
2035620 |
Nov 1969 |
DEX |
2361624 |
Dec 1972 |
DEX |
3733789 |
Apr 1989 |
DEX |
084510 |
May 1982 |
JPX |
428197 |
Jul 1967 |
CHX |
1337952 |
Nov 1973 |
GBX |
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Entry |
Abstract for FR. 2052085. |
Chemical Abstr. 91452W, vol. 67, 1967. |
Ullmann's Encyclopedia of Industrial Chemistry 5th Edition, vol. A11 pp. 126-128. |
Chem. Abstr. 111:196067e. |
Continuations (2)
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Number |
Date |
Country |
Parent |
158842 |
Nov 1993 |
|
Parent |
979957 |
Nov 1992 |
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