Claims
- 1. A method for the preparation of molded material for insulating components, which comprises:
- mixing a polyepoxide, and a polyisocyanate to form a reaction resin mixture having a viscosity of up to about 7000 mPa.sec at 25.degree. C. wherein the mole ration of epoxy to isocyanate groups is in the range of more than 1:1 to 5:1;
- reacting the reaction resin mixture with a hardening catalyst selected from the group consisting of a tertiary amine and an imidazole under conditions of an elevated pressure of 1 to 10 bar, a gelling temperature of about 130.degree. to 150.degree. C., and a mold occupation time of between 5 and 15 minutes to form a cross-linked polymer; heating the cross-linked polymer at a temperature from about 150.degree. to about 200.degree. C. to cause post-hardening and produce a molded material;
- said molded material having a mole ratio of oxazolidinone and isocyanurate rings greater than about 1; and the reaction of the epoxy and isocyanate groups therein being greater than 90% after hardening.
- 2. The method according to claim 1, wherein: the hardening catalyst comprises a latent hardening catalyst.
- 3. The method according to claim 2, wherein:
- the latent hardening catalyst comprises the adduct of a boron trihalogenide and at least one compound selected from the group consisting of a tertiary amine and an imidazole.
- 4. The method according to claim 2, wherein:
- the latent hardening catalyst comprises an electron acceptor deactivator and at least one compound selected from the group consisting of an imidazole and a tertiary amine.
- 5. The method according to claim 4, wherein:
- the latent hardening catalyst comprises a 7,7,8,8-tetracyanoquinodimethane deactivator and at least one compound selected from the group consisting of an imidazole and a tertiary amine.
- 6. The method according to claim 2 wherein: the latent hardening catalyst is selected from the group consisting of onium salts of tertiary amines and imidazoles.
- 7. The method according to claim 6, wherein:
- the latent hardening catalyst is selected from the group consisting of 1,2-dimethylimidazolium tetraphenyl borate and benzyltrimethyl-ammonium chloride.
- 8. The method according to claim 1 wherein:
- the hardening catalyst content in the reaction resin mixture is about 0.01-5.0% wt.
- 9. The method according to claim 8 wherein:
- the hardening catalyst content in the reaction resin mixture is about 0.25-2.5% wt.
- 10. The method according to claim 1, wherein:
- the reaction resin mixture includes a filler.
- 11. The method according to claim 2 wherein:
- the reaction resing mixture includes a filler.
- 12. The method according to claim 10, wherein:
- the filler is selected from the group consisting of quartz powder, fused silica, aluminum oxide, and dolomite.
- 13. The method according to claim 11, wherein:
- the filler is selected from the group consisting of quartz powder, fused silica, aluminum oxide, and dolomite.
Priority Claims (1)
Number |
Date |
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Kind |
3323084 |
Jun 1983 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 624,984, filed June 27, 1984, now abandoned.
US Referenced Citations (4)
Continuations (1)
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Number |
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624984 |
Jun 1984 |
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