US4303572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable composition
Assignee: Momentive Performance Materials Japan LLC
•
Filing: 1980-09-15
•
Granted: 1981-12-01
•
Expires: 2000-09-15
Abstract
Abstract A curable silicone composition comprising 100 parts by weight of polyorganosiloxane containing at least 2 vinyl radicals bonded to silicon atom(s) in the molecule 0.1-10 parts by weight of polyorganohydrogensiloxane containing more than 2 hydrogen atoms bonded to silicon atom(s), on the average, in the molecule, 5-500 parts by weight of fine powder of a transition metal, and a catalytic amount of a platinum catalyst containing no halogen atoms in the molecule.
Inventors
- 👤 Masayuki Hatanaka
- 👤 Atsushi Kurita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:28
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/02; C08K3/08; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A curable composition consisting essentially of: (A) 100 parts by weight of polyorganosiloxane containing at least 2 vinyl radicals bonded to silicon atom(s) in the molecule, (B) 0.1 to 10 parts by weight of polyorganohydrogensiloxane containing more than 2 hydrogen atoms bonded to silicon atom(s), on the average, in the molecule, (C) 5 to 500 parts by weight of fine, tungsten, powder, and (D) a catalytic amount of a platinum catalyst containing no halogen atoms in the molecule.
Claim 2
Dependent Claim
78 words
A curable composition consisting essentially of: (A) 100 parts by weight of polyorganosiloxane containing at least 2 vinyl radicals bonded to silicon atom(s) in the molecule, (B) 0.1 to 10 parts by weight of polyorganohydrogensiloxane containing more than 2 hydrogen atoms bonded to silicon atom(s), on the average, in the molecule, (C) 5 to 500 parts by weight of fine, tungsten, powder, and (D) a catalytic amount of a platinum catalyst containing no halogen atoms in the molecule.
Claim 3
Dependent Claim
12 words
A composition according to claim 1 which yields an elastomer by curing.
Claim 4
Dependent Claim
27 words
A composition according to claim 1 wherein the remainder of organic radicals bonded with silicon atoms in polyorganosiloxane (A), except for said vinyl radicals, are methyl radicals.
Claim 5
Dependent Claim
37 words
A composition according to claim 1 wherein said vinyl radicals are contained in an amount of 0.005 to 0.5 mol %, on the average, based on the total organic radicals bonded with silicon atoms in polyorganosiloxane (A).
Claim 6
Dependent Claim
22 words
A composition according to claim 1 wherein the average polymerization degree of polyorganosiloxane (A) is in the range of 100 to 10,000.
Claim 7
Dependent Claim
15 words
A composition according to claim 1 wherein said polyorganosiloxane (A) is end-blocked with dimethylvinylsiloxy groups.
Claim 8
Dependent Claim
25 words
A composition according to claim 1 wherein said platinum catalyst (D) is used in an amount of 0.1 to 1,000 ppm, based on polyorganosiloxane (A).
Claim 9
Dependent Claim
41 words
A composition according to claim 1 wherein said platinum catalyst (D) is a 0(zero)-valent platinum-phosphorus complex having the formula: Pt[PR.sub.3 ].sub.4 wherein R is a monovalent radical selected from the group consisting of monovalent hydrocarbon radicals, alkoxy radicals and aryloxy radicals.
Claim 10
Dependent Claim
23 words
A composition according to claim 1 wherein said platinum catalyst (D) is bis(acetylacetonato) platinum (II) of the formula: Pt(acac).sub.2 wherein "acac" represents acetylacetonato.
Claim 11
Dependent Claim
20 words
A composition according to claim 1 which further contains 10 to 100 parts by weight of fine powder of silica.
Claim 12
Dependent Claim
28 words
A composition according to claim 10 wherein said fine powder of silica has been surface-treated with an organosilicon compound selected from the group consisting of polyorganosiloxanes and hexamethyldisilazane.
Claim 13
Dependent Claim
10 words
A cured article of the composition defined in claim 1.
Claim 14
Dependent Claim
34 words
A composition according to claim 1 wherein said platinum catalyst is Pt[P(OPh) 3 ] 4 , Pt[P(OBu) 3 ] 4 or Pt[P(Ph) 3 ] 4 , wherein Ph is phenyl and Bu is butyl.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |