US4355129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxane elastomer-forming compositions
Assignee: Dow Silicones UK Ltd
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Filing: 1981-04-13
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Granted: 1982-10-19
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Expires: 2001-04-13
Abstract
Abstract A pigmented composition which is curable to a silicone rubber having improved color retention under conditions involving exposure to a corona discharge. The composition comprises (A) a curable polydiorganosiloxane, (B) a filler, (C) an organic peroxide curing agent and (D) a pigment which is an inorganic calcined complex containing Co and Al.
Inventors
- 👤 Michael J. Dams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:45
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A composition curable to an organopolysiloxane elastomer and which comprises (A) a polydiorganosiloxane convertible to the solid elastic state wherein the organic substituents are selected from monovalent hydrocarbon groups and monovalent fluorinated organic groups, at least 40 percent of the total number of substituents being methyl groups any groups having aliphatic unsaturation being present in a proportion of not more than 2 percent of the total number of substituents, the ratio of organic substituents to silicon atoms in the polydiorganosiloxane being in the range from 1.98 to 2.01, (B) a filler, (C) an organic peroxide curing agent, and (D) from 0.01 to 10 parts by weight per 100 parts by weight of (A) of a pigment which is an inorganic calcined complex oxide containing Co and Al.
Claim 2
Dependent Claim
127 words
A composition curable to an organopolysiloxane elastomer and which comprises (A) a polydiorganosiloxane convertible to the solid elastic state wherein the organic substituents are selected from monovalent hydrocarbon groups and monovalent fluorinated organic groups, at least 40 percent of the total number of substituents being methyl groups any groups having aliphatic unsaturation being present in a proportion of not more than 2 percent of the total number of substituents, the ratio of organic substituents to silicon atoms in the polydiorganosiloxane being in the range from 1.98 to 2.01, (B) a filler, (C) an organic peroxide curing agent, and (D) from 0.01 to 10 parts by weight per 100 parts by weight of (A) of a pigment which is an inorganic calcined complex oxide containing Co and Al.
Claim 3
Dependent Claim
23 words
A composition as claimed in claim 1 wherein the organic substituents in the polydiorganosiloxane (A) are selected from methyl, phenyl and vinyl groups.
Claim 4
Dependent Claim
32 words
A composition as claimed in claim 1 or claim 2 wherein the filler comprises from 10 to 60 parts by weight per 100 parts by weight of (A) of a reinforcing silica.
Claim 5
Dependent Claim
14 words
A composition as claimed in claims 1 or 2 which also contains alumina trihydrate.
Claim 6
Dependent Claim
16 words
A silicone rubber which is the product obtained by curing the composition claimed in claim 1.
Claim 7
Dependent Claim
36 words
A composition as claimed in claims 1 or 2 wherein the filler comprises from 10 to 60 parts by weight per 100 parts by weight of (A) of a reinforcing silica, and also contains alumina trihydate.
References Cited (Backward Citations)
US4269757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |