US4505848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone rubber molded products and a method for producing same
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1983-04-28
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Granted: 1985-03-19
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Expires: 2003-04-28
Abstract
Abstract Cured unitary molded articles containing conductive and insulating silicone rubber components are prepared by tightly contacting a curable insulating silicone rubber composition comprising a curable silicone rubber containing substantially no carbon black and a nonacyl-type peroxide with a cured conductive silicone rubber component containing carbon black and which has been cured by an addition reaction in the presence of a platinum-type catalyst and molding the resultant composition at elevated temperatures to cure the insulating silicone rubber component and form a unitary cured silicone rubber article. This invention also relates to cured silicone rubber articles prepared using the method of this invention.
Inventors
- 👤 Hideki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:24
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/78; H01H13/785; B; B29; B29C; B29C70/00; B29C70/88; B29C70/882; H01B; H01B1/00; H01B1/20; H01B1/24; H01C; H01C10/00; H01C10/10; H01C10/106; B29K; B29K2083/00; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/24; B29K2707/00; B29K2707/04; B29K2995/00; B29K2995/0003; B29K2995/0005; B29L; B29L2031/00; B29L2031/34; B29L2031/3443; H01H2201/00; H01H2201/022; H01H2201/032; H01H2209/00; H01H2209/002; H01H2229/00; H01H2229/044; H01H2229/046; H01H2229/058
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
A molded article consisting essentially of (A) a cured conductive silicone rubber containing from 5 to 75 weight percent carbon black, said component being cured by an addition reaction in the presence of a platinum type catalyst, and (B) a cured insulating silicone rubber component containing substantially no carbon black and which is cured by from 0.2 to 5.0 weight percent of a non-aryl peroxide, wherein said conductive and insulating components form a unitary article.
Claim 2
Dependent Claim
75 words
A molded article consisting essentially of (A) a cured conductive silicone rubber containing from 5 to 75 weight percent carbon black, said component being cured by an addition reaction in the presence of a platinum type catalyst, and (B) a cured insulating silicone rubber component containing substantially no carbon black and which is cured by from 0.2 to 5.0 weight percent of a non-aryl peroxide, wherein said conductive and insulating components form a unitary article.
Claim 3
Dependent Claim
30 words
The molded article of claim 1 wherein the conductive silicone rubber component is cured by an addition reaction between a polyorganosiloxane containing at least 2 alkenyl groups and a polyorganohydrogensiloxane.
Claim 4
Dependent Claim
24 words
The molded article of claim 1 wherein the conductive silicone rubber component contains from 10 to 50 weight percent of conductive grade carbon black.
Claim 5
Dependent Claim
14 words
The molded article of claim 1 wherein the article forms a two-color keyboard pad.
Claim 6
Dependent Claim
13 words
The molded article of claim 1 wherein the article forms a zebra-type connector.
Claim 7
Dependent Claim
14 words
The molded article of claim 2 wherein the article forms a two-color keyboard pad.
Claim 8
Dependent Claim
13 words
The molded article of claim 2 wherein the article forms a zebra-type connector.
Claim 9
Dependent Claim
13 words
The molded article of claim 1 wherein the article forms an electrical contact.
Claim 10
Dependent Claim
13 words
The molded article of claim 2 where the article forms an electrical contact.
Claim 11
Independent Claim
89 words
A method for preparing a unitary molded silicone rubber article comprising (I) tightly contacting (A) a cured conductive silicone rubber component containing from 5 to 75 weight percent carbon black, said component having been cured by an addition reaction in the presence of a platinum-type catalyst, and (B) an uncured insulating silicone rubber component containing substantially no carbon black and from 0.2 to 5.0 weight percent of a nonacyl-type organoperoxide, and (II) curing the insulating silicone rubber component at an elevated temperature to form a unitary silicone rubber article.
Claim 12
Independent Claim
89 words
A method for preparing a unitary molded silicone rubber article comprising (I) tightly contacting (A) a cured conductive silicone rubber component containing from 5 to 75 weight percent carbon black, said component having been cured by an addition reaction in the presence of a platinum-type catalyst, and (B) an uncured insulating silicone rubber component containing substantially no carbon black and from 0.2 to 5.0 weight percent of a nonacyl-type organoperoxide, and (II) curing the insulating silicone rubber component at an elevated temperature to form a unitary silicone rubber article.
Claim 13
Dependent Claim
29 words
The method of claim 10 wherein the conductive silicone rubber component is cured by an addition reaction between a polyorganosiloxane containing at least two alkenyl groups and a polyorganohydrogensiloxane.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein said alkenyl groups are vinyl groups.
Claim 15
Dependent Claim
12 words
The method of claim 10 wherein said platinum-type catalyst is chloroplatinic acid.
Claim 16
Dependent Claim
21 words
The method of claim 11 wherein said cured conductive component contains from 10 to 50 weight % of conductive carbon black.
Claim 17
Dependent Claim
14 words
The method of claim 10 wherein said nonacyl-type organoperoxide is dicumyl peroxide or 2,5-dimethyl-2,5-di(t-butylperoxy)hexane.
Claim 18
Dependent Claim
29 words
The method of claim 10 wherein said uncured insulating silicone rubber component is cured at a temperature of from 120° to 200° C. for from 5 to 20 minutes.
Claim 19
Dependent Claim
28 words
The method of claim 10 wherein said insulating silicone rubber is post cured at a temperature of from 150° to 260° C. for from 1 to 24 hours.
Claim 20
Dependent Claim
16 words
The method of claim 10 wherein said insulating silicone rubber component contains a reinforcing silica filler.
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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |