US4427574A
Expired / Lapsed
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Catalysts
Assignee: Imperial Chemical Industries Ltd
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Filing: 1982-06-14
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Granted: 1984-01-24
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Expires: 2002-06-14
Abstract
Abstract A platinum catalyst which comprises the admixture of of (a) a haloplatinum compound (b) an aliphatically unsaturated organosiloxane compound and (c) an aluminium alkoxide. These catalysts give high activity in promoting reactions of Si-H compounds with unsaturated groups of Si-OH. They are valuable in producing cured organopolysiloxanes such as release coatings. They are characterized by storage stability and freedom from corrosion of metallic containers.
Inventors
- 👤 Edward K. Pierpoint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0272; B01J31/0274; B01J31/0201; B01J31/0211; B01J31/0212; B01J31/12; B01J31/123; B01J31/124; B01J31/126; B01J31/26; B01J31/28; B01J31/30; B01J31/40; B01J31/4015; B01J31/4023; B01J31/4038; C; C07; C07F; C07F15/00; C07F15/0006; C07F15/0086; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/398; C08K; C08K5/00; C08K5/56; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
In an improved platinum catalyst of the type resulting from the admixture of a haloplatinum compound and an aliphatically unsaturated organosiloxane compound, the improvement which comprises the inclusion of an aluminium alkoxide.
Claim 2
Dependent Claim
32 words
In an improved platinum catalyst of the type resulting from the admixture of a haloplatinum compound and an aliphatically unsaturated organosiloxane compound, the improvement which comprises the inclusion of an aluminium alkoxide.
Claim 3
Dependent Claim
47 words
An improved platinum catalyst as claimed in claim 1 in which the aluminium alkoxide is aluminum triisopropoxide alone or in admixture with aluminium tri-sec. butoxide or is the multicomponent mixture of aluminium alkoxides resulting from forming alkoxides of aluminium with a mixture of isopropanol and secondary butanol.
Claim 4
Dependent Claim
70 words
A platinum catalyst comprising the admixture of (a) a haloplatinum compound selected from chloroplatinic acid or alkali metal salt thereof; PtCl 4 , PtCl 2 , H 2 PtCl 4 and its salts; complexes of platinous chloride and olefins or dialkyl sulphides or the analogous bromo compounds of any of the aforementioned chloro compounds; (b) an organopolysiloxane containing one or more vinyl or allyl groups; and (c) an aluminum alkoxide.
Claim 5
Dependent Claim
70 words
A platinum catalyst comprising the admixture of (a) a haloplatinum compound selected from chloroplatinic acid or alkali metal salt thereof; PtCl 4 , PtCl 2 , H 2 PtCl 4 and its salts; complexes of platinous chloride and olefins or dialkyl sulphides or the analogous bromo compounds of any of the aforementioned chloro compounds; (b) an organopolysiloxane containing one or more vinyl or allyl groups; and (c) an aluminum alkoxide.
Claim 6
Dependent Claim
17 words
A platinum catalyst as claimed in claim 3 wherein the organopolysiloxane (b) is divinyltetramethyl disiloxane or 1:3:5:7-tetramethyl-1:3:5:7-tetravinyl-cyclotetrasiloxane.
Claim 7
Dependent Claim
46 words
A platinum catalyst as claimed in claim 3 wherein the aluminium alkoxide (c) is aluminium triisopropoxide alone or in admixture with aluminium tri-sec. butoxide or is the multicomponent mixture of aluminium alkoxides resulting from forming alkoxides of aluminium with a mixture of isopropanol and secondary butanol.
Claim 8
Dependent Claim
37 words
A platinum catalyst as claimed in claim 3 wherein there is 1 part of component (a) with 30 to 300 parts of component (b) and 1 to 10 parts of component (c), the parts being by weight.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |