US3901824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New catalyst in the direct synthesis of dimethyltin dichloride
Assignee: Witco Corp
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Filing: 1973-08-03
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Granted: 1975-08-26
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Expires: 1993-08-03
Abstract
Abstract Dimethyltin dichloride is prepared by reacting tin metal with methyl chloride at 65*-230*C. in the presence of a catalyst system consisting of tin tetrachloride and trihydrocarbyl phosphine or trihydrocarbyl amine, having 3-24 carbon atoms. The trihydocarbyl amine or trihydrocarbyl phosphine may be quaternized before use. Pure dimethyltin dichloride is obtained in high yields and very light color with little or no toxic trimethyltin chloride without the need of recycling or other subsequent chemical purification. The process can be operated at atmospheric or elevated pressure.
Inventors
- 👤 Vasilije Knezevic
- 👤 Mark W Pollock
- 👤 Koei-Liang Liauw
- 👤 Gerald Spiegelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:26
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/26; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0237; B01J31/0239; B01J31/0255; B01J31/0267; B01J31/0268; C; C07; C07F; C07F7/00; C07F7/22; C07F7/2208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A CATALYST, FOR PREPARING DIMETHYLTIN DICHLORIDE BY HEATING TIN METAL WITH METHYL CHLORIDE, CONSISTING ESSENTIALLY OF TIN TETRACHLORIDE AND AT LEAST ONE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRIBUTYLAMINE, METHYL TRIBUTYL PHOSPHONIUM CHLORIDE AND METHYL TRIBUTYL AMMONIUM CHLORIDE WHEREIN SAID ORGANIC COMPOUND TO TIN TETRACHLORIDE IS WITHIN A MOLAR RATIO OF 1:4 TO 2:1.
Claim 2
Dependent Claim
56 words
A CATALYST, FOR PREPARING DIMETHYLTIN DICHLORIDE BY HEATING TIN METAL WITH METHYL CHLORIDE, CONSISTING ESSENTIALLY OF TIN TETRACHLORIDE AND AT LEAST ONE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRIBUTYLAMINE, METHYL TRIBUTYL PHOSPHONIUM CHLORIDE AND METHYL TRIBUTYL AMMONIUM CHLORIDE WHEREIN SAID ORGANIC COMPOUND TO TIN TETRACHLORIDE IS WITHIN A MOLAR RATIO OF 1:4 TO 2:1.
Claim 3
Dependent Claim
11 words
The catalyst of claim 1, wherein the organic compound is tributylamine.
Claim 4
Dependent Claim
14 words
The catalyst of claim 1, wherein the organic compound is methyl tributyl phosphonium chloride.
Claim 5
Dependent Claim
14 words
The catalyst of claim 1, wherein the organic compound is methyl tributyl ammonium chloride.
Claim 6
Dependent Claim
18 words
The catalyst of claim 2 wherein the tributyl amine and tin tetrachloride are in an about equimolar mixture.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |