Claims
- 1. A process for preparing resin impregnated wire windings comprisinga) heating said wire windings in an oven to a temperature of about 110 to about 200° C.; b) subsequently trickling a one-component impregnating resin, which is storage-stable at room temperature, onto the heated, rotating wire winding or dipping the heated, rotating wire winding in a bath filled with said one-component impregnating resin, wherein the impregnating resin consists essentially of: (A) an epoxy resin that is liquid at room temperature; and (B) a heat-activatible initiator for the polymerisation of the epoxy resin, the initiator comprising (a) at least one quarternary ammonium salt of an aromatic-heterocyclic compound which contains 1 or 2 nitrogen atoms, and of a complex halide anion selected from the group consisting of BF4θ, PF6θ, SbFθ6, SbF5(OH)θ and AsF6θ, and (b) at least one thermal radical former (b1), (b2), (b3) or (b4), wherein (b1) is a diarylethane derivative of formula III wherein Ar is phenyl, naphthyl, or C1-C4alkyl- or chloro-substituted phenyl, R6 is hydroxy, C1-C4alkoxy, —O—C—OR8 or —OSiR9R10R11, wherein R8 is C1-C8alkyl or phenyl, and R9, R10 and R11 are each independently of one another C1-C4alkyl or phenyl, and R7 is C1-C4alkyl or cyclohexyl or has the same meaning as Ar, (b2) is an oligomer of formula IV wherein Ar, R7, R9 and R10 have the same meaning as in formula II and n is 2-20, (b3) is an organic peroxy compound, and (b4) is a quinone.
- 2. A process according to claim 1, wherein component (A) is an epoxy resin based on the diglycidyl ether of bisphenol A, the diglycidyl ether of bisphenol F or a mixture of the diglycidyl ethers of bisphenol A and bisphenol F.
- 3. A process according to claim 1, wherein component (A) is an epoxy resin based on diglycidyl phthalate, diglycidylphthalate or triglycidyl trimellitate.
- 4. A process according to claim 1, wherein component (A) is an epoxy resin based on trimethylolpropane triglycidyl ether or a cycloaliphatic epoxy resin.
- 5. A process according to claim 1, wherein component (B2) is a mixture in which component (a) is a compound of formula V, VI or VII wherein R12 is C1-C12alkyl, C7-C20aralkyl, C3-C15alkoxyalkyl or benzoylmethyl, R13, R14, R15, R16 and R17 are each independently of one another hydrogen, C1-C4alkyl or phenyl, or R13 and R14 or R14 and R15 or R15 and R16 or R16 and R17, together with the two carbon atoms to which they are attached, form a fused benzo, naphtho-, pyridino or quinolino ring, and Y is BF4, PF6, SbF6SbF5(OH) or AsF6.
- 6. A process according to claim 1, wherein component (B2) is a mixture in which component (a) is N-benzylquinolinium hexafluoroantimonate.
- 7. A process according to claim 1, wherein component (B2) is a mixture in which component (b) is 1,1,2,2-tetraphoenyl-1,2-ethanediol.
- 8. A process according to claim 1, wherein component (B) is used in an amount of 0.05-8.0 parts by weight, based on 100 parts by weight of component (A).
Priority Claims (1)
Number |
Date |
Country |
Kind |
781/94 |
Mar 1994 |
CH |
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Parent Case Info
This application is a continuation, of application Ser. No. 08/400,918, filed Mar. 8, 1995.
US Referenced Citations (9)
Foreign Referenced Citations (8)
Number |
Date |
Country |
1445263 |
Apr 1970 |
DE |
3230426 |
Apr 1983 |
DE |
0540466 |
May 1995 |
DE |
0066543 |
Dec 1982 |
EP |
0094915 |
Jan 1987 |
EP |
0504569 |
Sep 1992 |
EP |
0540466 |
May 1993 |
EP |
973377 |
Oct 1964 |
GB |
Non-Patent Literature Citations (2)
Entry |
H. Batzer: “Polymere Werkstoffe”, Georg Thieme Verlag 1984, vol. III, pp. 307-309. |
Derwent Abstract 93-145790/18 of EP540466. |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/400918 |
Mar 1995 |
US |
Child |
08/999803 |
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US |