US3901844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate plastics having improved tracking resistance
Assignee: Bayer AG
•
Filing: 1974-03-28
•
Granted: 1975-08-26
•
Expires: 1994-03-28
Abstract
Abstract The resistance to tracking paths for electric currents of polycarbonate plastics is improved by dispersing from about 10 to about 50% by weight of a hydrophobic TiO2 or Cr2O3 therein. The polycarbonate composition may be used for making components which are associated with electrical conductors.
Inventors
- 👤 Paul Schiller
- 👤 Josef Merten
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:26
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/426; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A HIGH MOLECULAR WEIGHT, THERMOPLASTIC, AROMATIC POLYCARBONATE COMPOSITION ADAPTED FOR THE MANUFACTURE OF MOLDINGS FOR ELECTRICAL INSULATION WHICH ARE ELECTRICAL RESISTANT TO TRACKING, SAID POLYCARBONATE COMPOSITION COMPRISING FROM ABOUT 10 TO ABOUT 50 PER CENT BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE COMPOSITION, OF HYDROPHOBIC TIO2 OR CR2O3 WHICH ARE INERT TOWARDS THE POLYCARBONATE.
Claim 2
Dependent Claim
56 words
A HIGH MOLECULAR WEIGHT, THERMOPLASTIC, AROMATIC POLYCARBONATE COMPOSITION ADAPTED FOR THE MANUFACTURE OF MOLDINGS FOR ELECTRICAL INSULATION WHICH ARE ELECTRICAL RESISTANT TO TRACKING, SAID POLYCARBONATE COMPOSITION COMPRISING FROM ABOUT 10 TO ABOUT 50 PER CENT BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE COMPOSITION, OF HYDROPHOBIC TIO2 OR CR2O3 WHICH ARE INERT TOWARDS THE POLYCARBONATE.
Claim 3
Dependent Claim
31 words
A molded polycarbonate plastic containing from about 10 to about 50 per cent by weight of hydrohobic inert TiO2 or Cr2O3 which are resistant to the tracking of an electrical current.
Claim 4
Dependent Claim
31 words
A molded polycarbonate plastic containing from about 10 to about 50 per cent by weight of hydrohobic inert TiO2 or Cr2O3 which are resistant to the tracking of an electrical current.
Claim 5
Independent Claim
33 words
A method for improving the resistance of a polycarbonate plastic composition which comprises dispersing from about 10 to about 50 percent by weight of hydrophobic inert TiO2 or Cr2O3 in the said composition.
Claim 6
Independent Claim
33 words
A method for improving the resistance of a polycarbonate plastic composition which comprises dispersing from about 10 to about 50 percent by weight of hydrophobic inert TiO2 or Cr2O3 in the said composition.
Claim 7
Dependent Claim
23 words
An electrical insulator comprising a polycarbonate plastic containing from about 10 to about 50 percent by weight of hydrophobic inert TiO2 or Cr2O3.
Claim 8
Dependent Claim
23 words
An electrical insulator comprising a polycarbonate plastic containing from about 10 to about 50 percent by weight of hydrophobic inert TiO2 or Cr2O3.
Claim 9
Dependent Claim
21 words
The polycarbonate of claim 1 wherein the oxide additive has a particle size of from about 0.1 to about 100 microns.
Claim 10
Dependent Claim
21 words
The polycarbonate of claim 1 wherein the oxide additive has a particle size of from about 0.1 to about 10 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |