Patent US4745144A successfully refreshed from Google Patents.
US4745144A
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US
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Silicone rubber composition resistant against dynamic fatigue
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1986-08-14
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Granted: 1988-05-17
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Expires: 2006-08-14
Abstract
Abstract The silicone rubber composition comprises, in addition to the conventional ingredients of a high-polymeric diorganopolysiloxane and a reinforcing silica filler, a specific phosphorus-containing organic compound, such as phosphinates, phosphonates and phosphates, in a limited amount. By virtue of this unique ingredient, the composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue.
Inventors
- 👤 Kunio Itoh
- 👤 Kiyoshi Imai
- 👤 Takeshi Fukuda
- 👤 Nobuyuki Uesugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:18
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/0091; C08K5/53
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A silicone rubber composition which comprises: (a) 100 parts by weight of a substantially linear diorganopolysiloxane represented by the average unit formula R.sub.a SIO.sub.(4-a)/2 in which R is an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, cycloalkyl or substituted cycloalkyl group and a is a positive number in the range from 1.90 to 2.05; (b) from 10 to 100 parts by weight of a reinforcing silica filler having a specific surface area of at least 50 m 2 /g; and (c) from 0.05 to 5 parts by weight of a phosphorus-containing organic compound selected from the group consisting of phosphate, phosphonate, and phosphinate compounds.
Claim 2
Dependent Claim
106 words
A silicone rubber composition which comprises: (a) 100 parts by weight of a substantially linear diorganopolysiloxane represented by the average unit formula R.sub.a SIO.sub.(4-a)/2 in which R is an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, cycloalkyl or substituted cycloalkyl group and a is a positive number in the range from 1.90 to 2.05; (b) from 10 to 100 parts by weight of a reinforcing silica filler having a specific surface area of at least 50 m 2 /g; and (c) from 0.05 to 5 parts by weight of a phosphorus-containing organic compound selected from the group consisting of phosphate, phosphonate, and phosphinate compounds.
Claim 3
Dependent Claim
25 words
The silicone rubber composition as claimed in claim 1 wherein the organopolysiloxane is a diorganopolysiloxane having an average degree of polymerization of at least 5000.
Claim 4
Dependent Claim
37 words
The silicone rubber composition as claimed in claim 1 which further comprises an organic peroxide in an amount in the range from 0.1 to 5 parts by weight per 100 parts by weight of the component (a).
Claim 5
Dependent Claim
27 words
The silicone rubber composition as claimed in claim 2 wherein substantially all of the organic groups bonded to the silicon atoms in the diorganopolysiloxane are methyl groups.
Claim 6
Dependent Claim
40 words
The silicone rubber composition as claimed in claim 2 wherein from 0.01 to 0.5% by moles of the organic groups bonded to the silicon atoms in the diorganopolysiloxane are vinyl groups, the balance of the organic groups being methyl groups.
Claim 7
Dependent Claim
114 words
A cured silicone rubber body which is a cured product of a silicone rubber composition comprising: (a) 100 parts by weight of a substantially linear diorganopolysiloxane represented by the average unit formula R.sub.a SiO.sub.(4-a)/2, in which R is an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, cycloalkyl or substituted cycloalkyl group and a is a positive number in the range from 1.90 to 2.05; (b) from 10-100 parts by weight of a reinforcing silica filler having a specific surface area of at least 50 m 2 /g; and (c) from 0.05 to 5 parts by weight of a phosphorus-containing organic compound selected from the group consisting of phosphate, phosphonate, and phosphinate compounds.
Claim 8
Dependent Claim
114 words
A cured silicone rubber body which is a cured product of a silicone rubber composition comprising: (a) 100 parts by weight of a substantially linear diorganopolysiloxane represented by the average unit formula R.sub.a SiO.sub.(4-a)/2, in which R is an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, cycloalkyl or substituted cycloalkyl group and a is a positive number in the range from 1.90 to 2.05; (b) from 10-100 parts by weight of a reinforcing silica filler having a specific surface area of at least 50 m 2 /g; and (c) from 0.05 to 5 parts by weight of a phosphorus-containing organic compound selected from the group consisting of phosphate, phosphonate, and phosphinate compounds.
Claim 9
Dependent Claim
77 words
The silicone rubber composition of claim 1 wherein from 0.1 to 2 parts by weight of the phosphorus-containing organic compound is selected from the group consisting of (C 4 H 9 O) 3 PO, (CH 2 --C 6 H 4 --O) 3 PO, C 6 H 13 PO(OC 4 H 9 ) 2 , C 6 H 5 PO(OC 4 H 9 ) 2 , and (C 8 H 17 ) 2 PO(OC 4 H 9 ).
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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |