US4039503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone rubber compositions
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1976-02-13
•
Granted: 1977-08-02
•
Expires: 1996-02-13
Abstract
Abstract Silicone rubber compositions comprising a diorganopolysiloxane gum, an inorganic filler, a vinyl-containing organopolysiloxane resin, polyester fibers cut in a specific length, an amino- or mercapto-containing organosilane or organopolysiloxane as a coupling agent, and an organic peroxide as a curing agent. The novel compositions are capable of giving excellent mechanical properties, especially tear strength, to cured products or silicone elastomers, their other properties being as good as the conventional silicone rubber elastomers.
Inventors
- 👤 Kunio Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:17
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/01; C08K3/011; C08K5/00; C08K5/04; C08K5/14; C08K5/54; C08L67/00; C08L67/02; C08L83/08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
325 words
A silicone rubber composition consisting essentially of a. 100 parts by weight of a diorganopolysiloxane gum represented by the average unit formula R.sub.a.sup.1 SiO.sub.4.sub.-a/2 where R 1 is a substituted or unsubstituted monovalent hydrocarbon group and a has a value from 1.98 inclusive to 2.05 inclusive, b. from 20 to 250 parts by weight of an inorganic filler, c. from 1 to 20 parts by weight of an organopolysiloxane composed of from 20 to 60 mole % C 6 H 5 SiO 1 .5 units, from zero to 20 mole % CH 2 =CHSiO 1 .5 units, from 15 to 30 mole % (CH 3 )(CH 2 =CH)SiO units and 20 to 50 mole % (CH 3 ) 2 SiO units, the total of the C 6 H 5 SiO 1 .5 and CH 2 =CHSiO 1 .5 units being equivalent to from 20 to 60 mole % based on all siloxane units, d. from 10 to 100 parts by weight of polyester fiber having a softening point of 200° C. or higher, and composed of filaments from 0.5 to 5 mm in length, e. from 0.5 to 10 parts by weight of an organic silicon compound represented by the formula ##STR10## where R 2 and R 3 each are the same or different divalent hydrocarbon groups, R 4 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable group, Y is a group selected from the class consisting of H 2 N--, NC--, HO.CO.CH 2 .NH--, NH 2 .CO.NH--, ##STR11## C 6 H 5 --NH-- and HS--, b has a value of 0 or 1, c has a value greater than 0 but not exceeding 1, and d and e each have a value from 0 inclusive to 3 inclusive, with the proviso that (c+d+e) is equal to a value greater than 0 but not exceeding 4, and f. from 0.1 to 10 parts by weight of an organic peroxide.
Claim 2
Dependent Claim
325 words
A silicone rubber composition consisting essentially of a. 100 parts by weight of a diorganopolysiloxane gum represented by the average unit formula R.sub.a.sup.1 SiO.sub.4.sub.-a/2 where R 1 is a substituted or unsubstituted monovalent hydrocarbon group and a has a value from 1.98 inclusive to 2.05 inclusive, b. from 20 to 250 parts by weight of an inorganic filler, c. from 1 to 20 parts by weight of an organopolysiloxane composed of from 20 to 60 mole % C 6 H 5 SiO 1 .5 units, from zero to 20 mole % CH 2 =CHSiO 1 .5 units, from 15 to 30 mole % (CH 3 )(CH 2 =CH)SiO units and 20 to 50 mole % (CH 3 ) 2 SiO units, the total of the C 6 H 5 SiO 1 .5 and CH 2 =CHSiO 1 .5 units being equivalent to from 20 to 60 mole % based on all siloxane units, d. from 10 to 100 parts by weight of polyester fiber having a softening point of 200° C. or higher, and composed of filaments from 0.5 to 5 mm in length, e. from 0.5 to 10 parts by weight of an organic silicon compound represented by the formula ##STR10## where R 2 and R 3 each are the same or different divalent hydrocarbon groups, R 4 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable group, Y is a group selected from the class consisting of H 2 N--, NC--, HO.CO.CH 2 .NH--, NH 2 .CO.NH--, ##STR11## C 6 H 5 --NH-- and HS--, b has a value of 0 or 1, c has a value greater than 0 but not exceeding 1, and d and e each have a value from 0 inclusive to 3 inclusive, with the proviso that (c+d+e) is equal to a value greater than 0 but not exceeding 4, and f. from 0.1 to 10 parts by weight of an organic peroxide.
Claim 3
Dependent Claim
33 words
The silicone rubber composition as claimed in claim 1 wherein said component (a) is dimethylpolysiloxane gum having no more than 0.5 mole % methylvinylsiloxane units, the rest of siloxane units being dimethylsiloxane units.
Claim 4
Dependent Claim
48 words
The silicone rubber composition as claimed in claim 1 wherein said component (a) is a diorganopolysiloxane gum having no more than 10 mole % of phenyl groups directly bonded to silicon atoms, based on all organic groups, the rest of the organic groups being methyl and vinyl groups.
Claim 5
Dependent Claim
18 words
The silicone rubber composition as claimed in claim 1 wherein said component (b) is a finely divided silica.
Claim 6
Dependent Claim
30 words
The silicone rubber composition as claimed in claim 1 wherein said component (c) is an organopolysiloxane containing 0.5% by weight or more of hydroxy groups directly bonded to silicon atoms.
Claim 7
Dependent Claim
21 words
The silicone rubber composition as claimed in claim 1 wherein the group denoted by X is a methoxy or ethoxy group.
Claim 8
Dependent Claim
50 words
The silicone rubber composition as claimed in claim 1 wherein said component (e) is one selected from the group consisting of the silanes expressed by the formulas 1. H 2 N -- CH 2 -- CH 2 -- NH -- (CH 2 ) 3 Si(--OCH 3 ) 3 , ##STR12##
Claim 9
Dependent Claim
39 words
H 2 N -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , 4. H 2 N -- CH 2 -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , ##STR13##
Claim 10
Dependent Claim
39 words
H 2 N -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , 4. H 2 N -- CH 2 -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , ##STR13##
Claim 11
Dependent Claim
32 words
HS -- CH 2 -- CH 2 -- CH 2 --Si(--OCH 3 ) 3 and 7. C 6 H 5 -- NH -- (CH 2 ) 3 Si(--OCH 3 ) 3 .
Claim 12
Dependent Claim
32 words
HS -- CH 2 -- CH 2 -- CH 2 --Si(--OCH 3 ) 3 and 7. C 6 H 5 -- NH -- (CH 2 ) 3 Si(--OCH 3 ) 3 .
Claim 13
Dependent Claim
34 words
The silicone rubber composition as claimed in claim 1 wherein said component (c) is present in an amount from 1 to 5 parts by weight per 100 parts by weight of said component (a).
Claim 14
Dependent Claim
34 words
The silicone rubber composition as claimed in claim 1 wherein said component (d) is present in an amount from 10 to 60 parts by weight per 100 parts by weight of said component (a).
Claim 15
Dependent Claim
34 words
The silicone rubber composition as claimed in claim 1 wherein said component (e) is present in an amount from 2 to 5 parts by weight per 100 parts by weight of said component (a).
Claim 16
Dependent Claim
249 words
A silicone rubber composition consisting essentially of a. 100 parts by weight of diorganopolysiloxane gum represented by the average unit formula R.sub.a.sup.1 SiO.sub.(4.sub.-a/2) where R 1 is a substituted or unsubstituted monovalent hydrocarbon group and a has a value from 1.98 to 2.05 inclusive, not exceeding 0.5 mole % of the siloxane units being methylvinylsiloxane units, not exceeding 10 mole % of the groups denoted by R 1 being phenyl groups directly bonded to silicon atoms and the rest of the organic groups being methyl groups, b. from 10 to 100 parts by weight of finely divided silica, c. from 1 to 5 parts by weight of an organopolysiloxane composed of from 20 to 60 mole % C 6 H 5 SiO 1 .5 units, from zero to 20 mole % CH 2 =CHSiO 1 .5 units, from 15 to 30 mole % (CH 3 )(CH 2 =CH)SiO units and 20 to 50 mole % (CH 3 ) 2 SiO units, the total of the C 6 H 5 SiO 1 .5 and CH 2 =CHSiO 1 .5 units being equivalent to from 20 to 60 mole % based on all siloxane units, d. from 10 to 60 parts by weight of polyester fiber having a softening point of 200° C. or higher and composed of filaments from 0.5 to 5 mm in length, e. from 2 to 5 parts by weight of an organic silicon compound selected from the group consisting of the silanes expressed by the formulas
Claim 17
Dependent Claim
249 words
A silicone rubber composition consisting essentially of a. 100 parts by weight of diorganopolysiloxane gum represented by the average unit formula R.sub.a.sup.1 SiO.sub.(4.sub.-a/2) where R 1 is a substituted or unsubstituted monovalent hydrocarbon group and a has a value from 1.98 to 2.05 inclusive, not exceeding 0.5 mole % of the siloxane units being methylvinylsiloxane units, not exceeding 10 mole % of the groups denoted by R 1 being phenyl groups directly bonded to silicon atoms and the rest of the organic groups being methyl groups, b. from 10 to 100 parts by weight of finely divided silica, c. from 1 to 5 parts by weight of an organopolysiloxane composed of from 20 to 60 mole % C 6 H 5 SiO 1 .5 units, from zero to 20 mole % CH 2 =CHSiO 1 .5 units, from 15 to 30 mole % (CH 3 )(CH 2 =CH)SiO units and 20 to 50 mole % (CH 3 ) 2 SiO units, the total of the C 6 H 5 SiO 1 .5 and CH 2 =CHSiO 1 .5 units being equivalent to from 20 to 60 mole % based on all siloxane units, d. from 10 to 60 parts by weight of polyester fiber having a softening point of 200° C. or higher and composed of filaments from 0.5 to 5 mm in length, e. from 2 to 5 parts by weight of an organic silicon compound selected from the group consisting of the silanes expressed by the formulas
Claim 18
Dependent Claim
22 words
H 2 N -- CH 2 -- CH 2 -- NH -- CH 2 ) 3 Si(--OCH 3 ) 3 , ##STR14##
Claim 19
Dependent Claim
22 words
H 2 N -- CH 2 -- CH 2 -- NH -- CH 2 ) 3 Si(--OCH 3 ) 3 , ##STR14##
Claim 20
Dependent Claim
39 words
H 2 N -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , 4. H 2 N -- CH 2 -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , ##STR15##
Claim 21
Dependent Claim
39 words
H 2 N -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , 4. H 2 N -- CH 2 -- CH 2 -- CH 2 -- Si(--OC 2 H 5 ) 3 , ##STR15##
Claim 22
Dependent Claim
45 words
HS -- CH 2 -- CH 2 -- CH 2 -- Si(--OCH 3 ) 3 and 7. C 6 H 5 -- NH -- CH 2 ) 3 Si(--OCH 3 ) 3 . f. from 0.1 to 10 parts by weight of an organic peroxide.
Claim 23
Dependent Claim
45 words
HS -- CH 2 -- CH 2 -- CH 2 -- Si(--OCH 3 ) 3 and 7. C 6 H 5 -- NH -- CH 2 ) 3 Si(--OCH 3 ) 3 . f. from 0.1 to 10 parts by weight of an organic peroxide.
Claim 24
Dependent Claim
14 words
A silicone rubber product prepared by curing the composition as claimed in claim 1.
References Cited (Backward Citations)
US3660345A
Cited
US3723567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |