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US4151156A
Expired / Lapsed
US
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Mercapto group-containing silicone rubber compositions
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1978-07-18
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Granted: 1979-04-24
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Expires: 1998-07-18
Abstract
Abstract Mercapto group-containing silicone rubber compositions essentially consisting of a mercapto group-containing organopolysiloxane having a viscosity exceeding 100,000 cSt and represented by the average unit formula RaSiO(4-a/2) IN WHICH R is a monovalent hydrocarbon group substantially free from aliphatic unsaturation, at least two of the R groups in a molecule being mercaptoalkyl groups and a is between 1.98 and 2.05, a certain filler and sulfur, a metal oxide or a metal peroxide as a curing agent. Products from the composition have excellent chemical and mechanical properties and can be bonded to an organic synthetic rubber or natural rubber as well as metals in completely cured state.
Inventors
- 👤 Kunio Itoh
- 👤 Takeshi Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:46
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/01; C08K3/013; C08K3/02; C08K3/06; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A mercapto group-containing silicone rubber composition consisting essentially of (a) 100 parts by weight of a mercapto group-containing organopolysiloxane having a viscosity at least 100,000 centistokes measured at 25° C., said mercapto group-containing organopolysiloxane being represented by the following average unit formula R.sub.a SiO.sub.(4-a/2) wherein R stands for a substituted or unsubstituted monovalent hydrocarbon group substantially free from aliphatic unsaturation, at least two of groups R in a molecule being mercaptoalkyl groups bonded directly to the silicon atoms, and a is a number in the range from 1.98 to 2.05, (b) from 5 to 200 parts by weight of a filler having a specific surface area of at least 50 m 2 /g, and (c) from 0.1 to 10 parts by weight of a curing agent selected from the group consisting of sulfur, metal oxides and metal peroxides.
Claim 2
Dependent Claim
138 words
A mercapto group-containing silicone rubber composition consisting essentially of (a) 100 parts by weight of a mercapto group-containing organopolysiloxane having a viscosity at least 100,000 centistokes measured at 25° C., said mercapto group-containing organopolysiloxane being represented by the following average unit formula R.sub.a SiO.sub.(4-a/2) wherein R stands for a substituted or unsubstituted monovalent hydrocarbon group substantially free from aliphatic unsaturation, at least two of groups R in a molecule being mercaptoalkyl groups bonded directly to the silicon atoms, and a is a number in the range from 1.98 to 2.05, (b) from 5 to 200 parts by weight of a filler having a specific surface area of at least 50 m 2 /g, and (c) from 0.1 to 10 parts by weight of a curing agent selected from the group consisting of sulfur, metal oxides and metal peroxides.
Claim 3
Dependent Claim
42 words
The mercapto group-containing silicone rubber composition as claimed in claim 1 wherein the content of the mercaptoalkyl groups in component (a) is from 0.1 to 0.7 mole % based on the total organic groups bonded to the silicon atoms in component (a).
Claim 4
Dependent Claim
27 words
The mercapto group-containing silicone rubber composition as claimed in claim 1 wherein the specific surface area of component (b) is from 100 to 300 m 2 /g.
Claim 5
Dependent Claim
28 words
The mercapto group-containing silicone rubber composition as claimed in claim 1 wherein component (b) is selected from the group consisting of a silica filler and a carbon black.
Claim 6
Dependent Claim
16 words
The mercapto group-containing silicone rubber composition as claimed in claim 1 wherein component (c) is sulfur.
Claim 7
Dependent Claim
22 words
The mercapto group-containing silicone rubber composition as claimed in claim 1 wherein component (c) is a metal oxide or a metal peroxide.
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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |