US3965065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the electrical properties of organopolysiloxane elastomers and compositions therefor
Assignee: Dow Silicones Corp
•
Filing: 1975-09-08
•
Granted: 1976-06-22
•
Expires: 1995-09-08
Abstract
Abstract Heating a mixture of an organopolysiloxane convertible to the solid elastic state and aluminum hydrate for at least 30 minutes at a temperature above 100°C. provides a composition which can be cured to an elastomer having improved electrical properties, particularly improved electrical strength.
Inventors
- 👤 Edward C. Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08G; C08G77/00; C08G77/04; C08G77/32; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A method for preparing an improved elastomer-forming composition which comprises forming a mixture comprising (A) an organopolysiloxane which is convertible to the solid elastic state and (B) aluminum hydrate, and heating said mixture at a temperature of at least 100°C. for a time of at least 30 minutes.
Claim 2
Independent Claim
48 words
A method for preparing an improved elastomer-forming composition which comprises forming a mixture comprising (A) an organopolysiloxane which is convertible to the solid elastic state and (B) aluminum hydrate, and heating said mixture at a temperature of at least 100°C. for a time of at least 30 minutes.
Claim 3
Dependent Claim
33 words
The method in accordance with claim 1 in which the aluminum hydrate is present in an amount of from 15 to 200 parts by weight per 100 parts by weight of the polyorganosiloxane.
Claim 4
Dependent Claim
31 words
The method in accordance with claim 2 in which the elastomer-forming composition is heated at a temperature of from 140°C. to 200°C. for a time of from 1 to 3 hours.
Claim 5
Dependent Claim
10 words
An elastomer-forming composition prepared by the method of claim 1.
Claim 6
Dependent Claim
30 words
The method in accordance with claim 1 in which the prepared elastomer-forming composition is cooled below 100°C. and an organic peroxide vulcanization catalyst is added and mixed into the composition.
Claim 7
Dependent Claim
9 words
A mixture obtained by the method of claim 5.
Claim 8
Dependent Claim
18 words
An elastomer obtained by heating the mixture of claim 6 above the activation temperature of the organic peroxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |