US3933882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube method for the preparation of olefinic siloxane compounds
Assignee: Dow Silicones Corp
•
Filing: 1974-12-02
•
Granted: 1976-01-20
•
Expires: 1994-12-02
Abstract
Abstract A vaporized mixture of a platinum catalyst in the amount of 0.01 to 2 p.p.m. platinum, an acetylenic alcohol and a siloxane compound having at least three silicon-bonded hydrogen atoms per molecule is passed through a tube such as a stainless steel tube heated at 210°C. to 450°C. to produce an olefinic siloxane compound which is, below 100°C., an inhibitor for the reaction between the acetylenic alcohol and the siloxane compound having at least three silicon-bonded hydrogen atoms in the presence of platinum.
Inventors
- 👤 Chi-Long Lee
- 👤 Myron T. Maxson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:08
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0876; C07F7/0878; C07F7/0879; C08G77/045; C08G77/382; C08G77/398; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
A method of reacting an acetylenic alcohol with a siloxane compond having at least three silicon-bonded hydrogen atoms bonded to at least three different silicon atoms in the presence of a platinum catalyst to provide an olefinic siloxane compound wherein the olefinic siloxane compound is an inhibitor for the platinum catalyst comprising passing a vaporized mixture of acetylenic alcohol, a soluble platinum catalyst and siloxane compound having at least three silicon-bonded hydrogen atoms through a tube heated at a temperature of from 210°C. to 450°C. and collecting a reaction product which is an olefinic siloxane compound which is, below 100°C., an inhibitor for the reaction between the acetylenic alcohol and the siloxane compound having at least three silicon-bonded-hydrogen atoms in the presence of a platinum catalyst, said mixture containing from 0.01 to 2 parts by weight platinum per one million parts by weight mixture.
Claim 2
Independent Claim
144 words
A method of reacting an acetylenic alcohol with a siloxane compond having at least three silicon-bonded hydrogen atoms bonded to at least three different silicon atoms in the presence of a platinum catalyst to provide an olefinic siloxane compound wherein the olefinic siloxane compound is an inhibitor for the platinum catalyst comprising passing a vaporized mixture of acetylenic alcohol, a soluble platinum catalyst and siloxane compound having at least three silicon-bonded hydrogen atoms through a tube heated at a temperature of from 210°C. to 450°C. and collecting a reaction product which is an olefinic siloxane compound which is, below 100°C., an inhibitor for the reaction between the acetylenic alcohol and the siloxane compound having at least three silicon-bonded-hydrogen atoms in the presence of a platinum catalyst, said mixture containing from 0.01 to 2 parts by weight platinum per one million parts by weight mixture.
Claim 3
Dependent Claim
32 words
The method in accordance with claim 1 in which the reaction product is distilled at reduced pressure to separate the olefinic siloxane compound from any unreacted starting reactants and any by-produced materials.
Claim 4
Dependent Claim
68 words
The method in accordance with claim 1 in which the reaction product vapors coming from the heated tube are passed through a series of condensers which are at temperatures decreasing from the condenser immediately connected to the heated tube such that the highest boiling compound is condensed and separated from the reaction product first and the lowest boiling compound of the reaction mixture is last to be condensed.
Claim 5
Dependent Claim
22 words
The method in accordance with claim 1 in which the mixture is passed through the heated tube with an inert carrier gas.
Claim 6
Dependent Claim
26 words
The method in accordance with claim 1 in which the residence time of the mixture in the heated tube is from 5 seconds to 120 seconds.
Claim 7
Dependent Claim
26 words
The method in accordance with claim 4 in which the residence time of the mixture in the heated tube is from 5 seconds to 120 seconds.
Claim 8
Dependent Claim
21 words
The method in accordance with claim 1 in which the tube is heated to a temperature of from 300°C. to 400°C.
Claim 9
Dependent Claim
21 words
The method in accordance with claim 6 in which the tube is heated to a temperature of from 300°C. to 400°C.
Claim 10
Dependent Claim
14 words
The method in accordance with claim 7 in which the acetylenic alcohol is 3-methyl-1-butyn-3-ol.
Claim 11
Dependent Claim
14 words
the method in accordance with claim 8 in which the acetylenic alcohol is 3-methyl-l-butyn-3-ol.
Claim 12
Dependent Claim
26 words
The method in accordance with claim 9 in which the siloxane compound having at least three silicon-bonded hydrogen atoms is a siloxane of the formula ##EQU5##
Claim 13
Dependent Claim
26 words
The method in accordance with claim 9 in which the siloxane compound having at least three silicon-bonded hydrogen atoms is a siloxane of the formula ##EQU6##
Claim 14
Dependent Claim
36 words
The method in accordance with claim 1 in which the platinum catalyst is present in amounts sufficient to provide from 0.01 to 1.0 parts by weight platinum per one million parts by weight of the mixture.
Claim 15
Dependent Claim
36 words
The method in accordance with claim 12 in which the platinum catalyst is present in amounts sufficient to provide from 0.01 to 1.0 parts by weight platinum per one million parts by weight of the mixture.
References Cited (Backward Citations)
US2823218A
Cited
US3404169A
Cited
US3419593A
Cited
US3453233A
Cited
US3576027A
Cited
US3814730A
Cited
US3775452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |