Patent US3878281A successfully refreshed from Google Patents.
US3878281A
Expired / Lapsed
US
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Process for the manufacture of intermediates for the production of molded electric insulating elements
Assignee: Wacker Chemie AG
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Filing: 1973-04-12
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Granted: 1975-04-15
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Expires: 1993-04-12
Abstract
Abstract This invention relates to a method for manufacturing intermediates for the production of molded electric insulating elements by adding an aqueous suspension containing mica and thermosetting organopolysiloxane resins which are solid at ambient temperature to a molding device, removing the water by mechanical means, heating the mold thus obtained for from 0.1 to 60 seconds at a temperature between the softening point of the organopolysiloxane resin and 99*C. and thereafter drying the resultant mold.
Inventors
- 👤 Siegfried Nitzsche
- 👤 Ignaz Bauer
- 👤 Bernward Deubzer
- 👤 Wolfgang Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:18
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/04; H01B3/18; H01B3/30; H01B3/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
AN IMPROVED METHOD FOR PREPARING INTERMEDIATE PRODUCTS FOR MANUFACTURING ELECTRIC INSULATING MOLDED FORMS IN WHICH AN AQUEOUS SUSPENSION CONTAINING MICA HAVING LAMINATING CHARACTERISTICS AND THERMOSETTING ORGANOPOLYSILOXANE RESIN PARTICLES HAVING A DIAMETER UP TO ABOUT 0.5 CM. AND WHICH ARE SOLID AT AMBIENT TEMPERATURE IS APPLIED TO A SHAPING SUPPORT, SAID RESIN PARTICLES ARE PRESENT IN AN AMOUNT OF FROM 2 TO 20 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE ORGANOPOLYSILOXANE RESIN AND MICA, WATER IS REMOVED BY MECHANICAL MEANS AND THE FORM THUS FORMED IS REMOVED FROM THE SUPPORT AND DRIED, THE IMPROVENENT WHICH COMPRISES HEATING THE FORM AFTER REMOVING THE WATER BY MECHANICAL MEANS AND PRIOR TO REMOVING THE FORM FROM THE SUPPORT ON WHICH IT WAS FORMED TO A TEMPERATURE BETWEEN THE SOFTENING POINT OF THE ORGANOPOLYSILOXANE RESIN AND 99*C. FOR FROM 0.1 TO 60 SECONDS.
Claim 2
Dependent Claim
141 words
AN IMPROVED METHOD FOR PREPARING INTERMEDIATE PRODUCTS FOR MANUFACTURING ELECTRIC INSULATING MOLDED FORMS IN WHICH AN AQUEOUS SUSPENSION CONTAINING MICA HAVING LAMINATING CHARACTERISTICS AND THERMOSETTING ORGANOPOLYSILOXANE RESIN PARTICLES HAVING A DIAMETER UP TO ABOUT 0.5 CM. AND WHICH ARE SOLID AT AMBIENT TEMPERATURE IS APPLIED TO A SHAPING SUPPORT, SAID RESIN PARTICLES ARE PRESENT IN AN AMOUNT OF FROM 2 TO 20 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE ORGANOPOLYSILOXANE RESIN AND MICA, WATER IS REMOVED BY MECHANICAL MEANS AND THE FORM THUS FORMED IS REMOVED FROM THE SUPPORT AND DRIED, THE IMPROVENENT WHICH COMPRISES HEATING THE FORM AFTER REMOVING THE WATER BY MECHANICAL MEANS AND PRIOR TO REMOVING THE FORM FROM THE SUPPORT ON WHICH IT WAS FORMED TO A TEMPERATURE BETWEEN THE SOFTENING POINT OF THE ORGANOPOLYSILOXANE RESIN AND 99*C. FOR FROM 0.1 TO 60 SECONDS.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the form is heated from 0.1 to 30 seconds to a temperature of from 70* to 90*C.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the form is heated by means of heat transfer agents.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the form is heated by means of hot water.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the aqueous suspension contains a hardening catalyst.
References Cited (Backward Citations)
US3133217A
Cited
US3523061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |