Patent US4690967A successfully refreshed from Google Patents.
US4690967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-curable organopolysiloxane compositions
Assignee: Rhone Poulenc Specialites Chimiques
•
Filing: 1984-12-21
•
Granted: 1987-09-01
•
Expires: 2004-12-21
Abstract
Abstract Improved heat-curable organopolysiloxane compositions, easily vulcanizable into silicone elastomers, are comprised of (A) a major amount of a diorganopolysiloxane gum, (B) a reinforcing filler therefor, (C) optionally, a diorganopolysiloxane oil, (D) an organic peroxide catalyst, and minor amounts of at least three of the following four additives: (E) an organohydrogenopolysiloxane, (F) an organofluorinated polymer, (G) an organosilonxane irgabcompound bearing at least one acroyloxyalkyl or methacroyloxyalkyl substituent covalently bonded to a silicon atom thereof, and (H) a boron compound.
Inventors
- 👤 Robert Lagarde
- 👤 Noel Bouverot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:18
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K5/00; C08K5/55; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/24; C08G77/70
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
103 words
A heat-curable organopolysiloxane composition of matter, comprising (A) a major amount of a diorganopolysiloxane gum having a viscosity greater than 1,000,000 mPa.s at 25° C.; (B) a reinforcing amount of a reinforcing filler therefor; (D) a catalytic amount of an organic peroxide; and at least three of the following four constituents (E), (F), (G) and (H): (E) a minor amount of an organohydrogenopolysiloxane; (F) a minor amount of an organofluorinated polymer; (G) a minor amount of an organosiloxane compound containing at least one acroyloxyalkyl or methacroyloxyalkyl group covalently bonded to a silicon atom thereof; and (H) a minor amount of a boron compound.
Claim 2
Dependent Claim
103 words
A heat-curable organopolysiloxane composition of matter, comprising (A) a major amount of a diorganopolysiloxane gum having a viscosity greater than 1,000,000 mPa.s at 25° C.; (B) a reinforcing amount of a reinforcing filler therefor; (D) a catalytic amount of an organic peroxide; and at least three of the following four constituents (E), (F), (G) and (H): (E) a minor amount of an organohydrogenopolysiloxane; (F) a minor amount of an organofluorinated polymer; (G) a minor amount of an organosiloxane compound containing at least one acroyloxyalkyl or methacroyloxyalkyl group covalently bonded to a silicon atom thereof; and (H) a minor amount of a boron compound.
Claim 3
Dependent Claim
124 words
The heat-curable organopolysiloxane composition as defined by claim 1, comprising: (A) 100 parts by weight of a diorganopolysiloxane gum having a viscosity greater than 1,000,000 mPa.s at 25° C.; (B) 5 to 150 parts by weight of a reinforcing filler therefor; (D) 0.1 to 7 parts by weight of an organic peroxide; and at least three of the following constituents (E), (F), (G) and (H): (E) 0.1 to 5 parts by weight of an organohydrogenopolysiloxane: (F) 0.1 to 6 parts by weight of an organofluorinated polymer: (G) 0.02 to 4 parts by weight of an organosiloxane compound containing at least 1 acroyloxyalkyl or methacroyloxyalkyl group convalently bonded to a silicon atom thereof, and (H) 0.1 to 4 parts by weight of a boron compound.
Claim 4
Dependent Claim
109 words
The heat-curable organopolysiloxane composition as defined by claim 2, further comprising up to 15 parts by weight of a diorganopolysiloxane oil (C) having a viscosity of at most 5000 mPa.s at 25° C., which comprises a sequence of recurring units of the formula R" 2 SiO and blocked at each end of its polymer chain by a radical of the formula OR', in which formulae the symbols R", which are identical or different, represent methyl, phenyl and vinyl radicals, at least 40% of such radicals being methyl, and the symbol R' represents a hydrogen atom, an alkyl radical having from 1 to 4 carbon atoms or a betamethoxyethyl radical.
Claim 5
Dependent Claim
31 words
The heat-curable organopolysiloxane as defined by claim 2, wherein said reinforcing filler (B) comprises a pyrogenic or precipitated silica having a specific surface area of at least 50 m 2 /g.
Claim 6
Dependent Claim
110 words
The heat-curable organopolysiloxane composition as defined by claim 2, wherein said diorganopolysiloxane gum (A) comprises a sequence of recurring units of the formula R 2 SiO, and is blocked at each end of its polymer chain by a unit of the formula R 3 SiO 0 .5 and/or a radical of the formula OR', in which formulae the symbols R, which are identical or different, represent methyl, ethyl, n-propyl, phenyl, vinyl and 3,3,3-trifluoropropyl radicals, at least 60% of these radicals being methyl and at most 3% being vinyl, and the symbol R' represents a hydrogen atom, an alkyl radical having from 1 to 4 carbon atoms or a beta-methoxyethyl radical.
Claim 7
Dependent Claim
54 words
The heat-curable organopolysiloxane composition as defined by claim 2, wherein said organohydrogenopolysiloxane (E) has the average general formula ##STR9## in which the symbol R" represents a methyl, phenyl or vinyl radical, the symbol a represents any number ranging from 0.4 to 2 and the symbol b represents any number ranging from 0.2 to 1.
Claim 8
Dependent Claim
22 words
The heat-curable organopolysiloxane composition as defined by claim 2, wherein said organofluorinated polymer (F) comprises a pulverulent solid and/or an aqueous dispersion.
Claim 9
Dependent Claim
77 words
The heat-curable organopolysiloxane composition as defined by claim 2, wherein said organosiloxane compound (G) has the formula: ##STR10## in which the symbol R" represents a methyl, phenyl or vinyl radical, the symbol R 3 represents a hydrogen atom or the methyl radical, the symbol R 4 represents a methyl, ethyl, n-propyl or beta-methoxyethyl radical, the symbol w represents a number ranging from 1 to 5 and the symbol u represents a number ranging from 0 to 2.
Claim 10
Dependent Claim
21 words
The heat-curable organopolysiloxane composition as defined by claim 2, wherein said boron compound (H) comprises an organic or inorganic boron derivative.
Claim 11
Dependent Claim
16 words
An elastomeric organopolysiloxane comprising the composition of matter as defined by claim 1, in vulcanized state.
Claim 12
Dependent Claim
16 words
An elastomeric organopolysiloxane comprising the composition of matter as defined by claim 2, in vulcanized state.
Claim 13
Dependent Claim
12 words
A shaped article comprising the elastomeric organopolysiloxane as defined by claim 10.
Claim 14
Dependent Claim
12 words
A shaped article comprising the elastomeric organopolysiloxane as defined by claim 11.
Claim 15
Dependent Claim
111 words
The heat curable organopolysiloxane composition as defined by claim 2, wherein said boron compound (H) is a borosiloxane derived from the reaction of an inorganic or organic boron derivative with a polyorganosiloxane of the average general formula: ##STR11## in which each symbol R represents a methyl, ehtyl, n-propyl phenyl, vinyl, or 3,3,3-trifluoropropyl radical, at least 60% of such radicals being methyl and at most 3% being vinyl, each symbol R' represents a hydrogen atom, an alkyl radical having from 1 to 4 carbon atoms or a beta-methoxyethyl radical, the symbol c represents any number ranging from 0.5 to 3 and the symbol d represents any number ranging from zero to 1.
References Cited (Backward Citations)
US2710290A
Cited
US3070560A
Cited
GB1002266A
Cited
US3449290A
Cited
US4010136A
Cited
FR2380326A1
Cited
US4202812A
Cited
GB2060667A
Cited
EP0051369A1
Cited
US4539357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |