Patent US4898689A successfully refreshed from Google Patents.
US4898689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive silicone rubber particles
Assignee: DuPont Toray Specialty Materials KK
•
Filing: 1988-06-30
•
Granted: 1990-02-06
•
Expires: 2008-06-30
Abstract
Abstract The electroconductive silicon rubber particulate of the present invention is an electroconductive silicone rubber particulate characterized by the fact that it contains an electroconductive material and that the particle diameter is from 0.1 to 1000 micrometers. It is an electroconductive material having excellent properties of lubrication, and has the characteristic capability, when added to a variety of materials such as various organic resins and rubbers including silicone rubber, of contributing to these materials stable levels of conductivity ranging from the semiconductive range to the conductive range, for the prevention of electrostatic and electrical charge build-up.
Inventors
- 👤 Mitsuo Hamada
- 👤 Koji Shimizu
- 👤 Haruki Wakita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:01
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K9/00; C08K9/08; H01B1/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
An electroconductive silicone rubber particulate consisting essentially of from 0.5 to 280 parts by weight of an electrically conductive material per 100 parts by weight of silicone rubber and having a particle diameter of from 0.1 to 1000 micrometers.
Claim 2
Dependent Claim
39 words
An electroconductive silicone rubber particulate consisting essentially of from 0.5 to 280 parts by weight of an electrically conductive material per 100 parts by weight of silicone rubber and having a particle diameter of from 0.1 to 1000 micrometers.
Claim 3
Dependent Claim
18 words
An electroconductive silicone rubber particulate in accordance with claim 1, wherein the electrically conductive material is carbon black.
Claim 4
Dependent Claim
29 words
An electroconductive silicone rubber particulate in accordance with claim 1, characterized by the fact that it serves as an agent for the addition of electroconductive properties to silicone rubber.
Claim 5
Dependent Claim
42 words
A composition comprising 100 parts by weight of a matrix, selected from the group consisting of rubber, organic resin, and lubricant, in which from 25 to 125 parts by weight of the electroconductive silicone rubber particulate of claim 1 is uniformly dispersed.
Claim 6
Dependent Claim
25 words
The composition of claim 4 in which the matrix is silicone rubber in which the electroconductive silicone rubber particulate of claim 1 is uniformly dispersed.
Claim 7
Dependent Claim
69 words
A composition comprising 100 parts by weight of a matrix of silicone rubber in which there is dispsersed from 25 to 125 parts by weight of an electroconductive silicone rubber particulate consisting essentially of from 0.5 to 280 parts by weight of an electrically conductive material per 100 parts by weight of the silicone rubber in the particle and has a particle diameter of from 0.1 to 1000 micrometers.
Claim 8
Dependent Claim
69 words
A composition comprising 100 parts by weight of a matrix of silicone rubber in which there is dispsersed from 25 to 125 parts by weight of an electroconductive silicone rubber particulate consisting essentially of from 0.5 to 280 parts by weight of an electrically conductive material per 100 parts by weight of the silicone rubber in the particle and has a particle diameter of from 0.1 to 1000 micrometers.
Claim 9
Dependent Claim
13 words
The composition of claim 6 wherein the electrically conductive material is carbon black.
Claim 10
Dependent Claim
36 words
The particulate of claim 1 in which the electrically conductive material is present in an amount of from 1 to 100 parts by weight per 100 parts by weight of the silicone rubber in the particle.
References Cited (Backward Citations)
US4273697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |