US4320044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-extinguishing silicone rubber containing aluminum hydrate
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1980-10-16
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Granted: 1982-03-16
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Expires: 2000-10-16
Abstract
Abstract A mixture of polydiorganosiloxane, aluminum hydrate, and gamma-type iron sesquioxide or ferroferric oxide can be cured to provide a silicone rubber with improved self-extinguishing properties and heat stability.
Inventors
- 👤 Akito Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/01; C08K3/016; C08K5/00; C08K5/0008; C08K5/0066; C08K5/04; C08K5/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
127 words
A mixture comprising (A) 100 parts by weight of a polydiorganosiloxane represented by an average unit formula R.sub.a SiO.sub.4-a /2 wherein each R is selected from a monovalent hydrocarbon radical and a halogen-substituted monovalent hydrocarbon radical, and a has an average value of from 1.98 to 2.05, (B) 50 to 300 parts by weight of aluminum hydrate with an average particle size of ≦50 μm, and (C) 0.1 to 30 parts by weight of an oxide selected from the group consisting of gamma-type iron sesquioxide, ferroferric oxide, and mixtures thereof, said oxide being in the form of an extremely fine powder, and said ferroferric oxide having a formula (FeO) x (Fe 2 O 3 ) y in which the ratio of x/y is from 0.05/1 to 1.0/1.
Claim 2
Dependent Claim
127 words
A mixture comprising (A) 100 parts by weight of a polydiorganosiloxane represented by an average unit formula R.sub.a SiO.sub.4-a /2 wherein each R is selected from a monovalent hydrocarbon radical and a halogen-substituted monovalent hydrocarbon radical, and a has an average value of from 1.98 to 2.05, (B) 50 to 300 parts by weight of aluminum hydrate with an average particle size of ≦50 μm, and (C) 0.1 to 30 parts by weight of an oxide selected from the group consisting of gamma-type iron sesquioxide, ferroferric oxide, and mixtures thereof, said oxide being in the form of an extremely fine powder, and said ferroferric oxide having a formula (FeO) x (Fe 2 O 3 ) y in which the ratio of x/y is from 0.05/1 to 1.0/1.
Claim 3
Dependent Claim
11 words
The mixture according to claim 1 further comprising an organic peroxide.
Claim 4
Dependent Claim
25 words
The mixture according to claim 1 further comprising at least one filler selected from the group consisting of a reinforcing filler and a bulking filler.
Claim 5
Dependent Claim
11 words
The mixture according to claim 3 further comprising an organic peroxide.
Claim 6
Dependent Claim
45 words
The mixture according to claim 1 further comprising a self-extinguishing enhancing material selected from the group consisting of finely powdered copper, calcium carbonate, calcium zirconate, zirconium silicate, manganese carbonate, titanium dioxide, cobalt organic acid salts, organophosphorus compounds, azo compounds, triazole compounds, and sulfur-free carbon black.
Claim 7
Dependent Claim
11 words
The mixture according to claim 5 further comprising an organic peroxide.
Claim 8
Dependent Claim
25 words
The mixture according to claim 6 further comprising at least one filler selected from the group consisting of a reinforcing filler and a bulking filler.
Claim 9
Dependent Claim
77 words
The mixture according to claim 2 in which the polydiorganosiloxane of (A) has a degree of polymerization of ≦1000, the aluminum hydrate of (B) is present in an amount of 100 to 200 parts by weight, the oxide of (C) is present in an amount of from 1 to 20 parts by weight and the organic peroxide is present in an amount of from 0.3 to 6 parts by weight per 100 parts by weight of (A).
Claim 10
Dependent Claim
17 words
The mixture according to claim 1 in which the oxide of (C) is the gamma-type ferric oxide.
Claim 11
Dependent Claim
17 words
The mixture according to claim 8 in which the oxide of (C) is the gamma-type ferric oxide.
Claim 12
Dependent Claim
16 words
The mixture according to claim 1 in which the oxide of (C) is the ferroferric oxide.
Claim 13
Dependent Claim
16 words
The mixture according to claim 8 in which the oxide of (C) is the ferroferric oxide.
Claim 14
Dependent Claim
25 words
The mixture according to claim 8 further comprising at least one filler selected from the group consisting of a reinforcing filler and a bulking filler.
Claim 15
Dependent Claim
15 words
The mixture according to claim 13 in which there is present a reinforcing silica filler.
Claim 16
Dependent Claim
27 words
The mixture according to claim 14 further comprising an organosilicon compound selected from the group consisting of diphenylsilanediol, an alkoxysilane and low molecular weight hydroxyl endblocked polydimethylsiloxane.
Claim 17
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 2.
Claim 18
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 4.
Claim 19
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 6.
Claim 20
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 8.
Claim 21
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 13.
Claim 22
Dependent Claim
13 words
A self-extinguishing silicone rubber obtained by heat vulcanizing the mixture of claim 15.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |