EP0186438A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for making carboxyfunctional silicone glycols
Assignee: Dow Silicones Corp
•
Filing: 1985-12-19
•
Granted: —
•
Expires: 2005-12-19
Abstract
Abstract Carboxyfunctional silicone glycols are made by equilibration at elevated temperatures of silicone glycols in which the glycol radical or radicals are bonded to silicon with an Si-C linkage and carboxyfunctional siloxanes in which the carboxy radical or radicals are bonded to silicon with an Si-C linkage in the presence of an acid catalyst which is capable of breaking Si-O linkages but not Si-C linkages. The carboxyfunctional silicone glycols so produced are of the type which are useful as profoamers, surfactants, spreading agents for active chemicals such as pesticides, hydrophilizing treatments for fabrics and hair, as emollients in cosmetic formulations and as chelates.
Inventors
- 👤 Terence John Swihart
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:44
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/84; A61K8/89; A61K8/891; A61K8/894; A61K8/896; A61K8/899; A61Q; A61Q19/00; C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C08G77/14; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A method for making a carboxyfunctional silicone glycol which method comprises the steps of: (1) mixing together (a) a silicone glycol or a mixture of silicone glycols selected from the group consisting of silicone glycols in which at least one of the glycol radical or radicals is bonded to silicon with an Si-C linkage; (b) a carboxyfunctional siloxane, or a mixture of carboxyfunctional siloxanes selected from the group consisting of carboxyfunctional siloxanes in which at least one of the carboxy radical or radicals is bonded to silicon with an Si-C linkage wherein at least one of (a) and (b) also includes non-glycol-containing and non-carboxyfunctional- containing diorganosiloxane units; and (c) a catalytic amount of an acid catalyst capable of breaking Si-O linkages in (a) and (b) but incapable of breaking Si-C linkages therein; . (2) heating the mixture to an elevated temperature; and (3) maintaining the mixture at said elevated temperature for at least about 4 hours, whereby equilibration of (a) and (b) occurs to produce an equilibration product containing carboxyfunctional silicone glycol.
Claim 2
Independent Claim
172 words
A method for making a carboxyfunctional silicone glycol which method comprises the steps of: (1) mixing together (a) a silicone glycol or a mixture of silicone glycols selected from the group consisting of silicone glycols in which at least one of the glycol radical or radicals is bonded to silicon with an Si-C linkage; (b) a carboxyfunctional siloxane, or a mixture of carboxyfunctional siloxanes selected from the group consisting of carboxyfunctional siloxanes in which at least one of the carboxy radical or radicals is bonded to silicon with an Si-C linkage wherein at least one of (a) and (b) also includes non-glycol-containing and non-carboxyfunctional- containing diorganosiloxane units; and (c) a catalytic amount of an acid catalyst capable of breaking Si-O linkages in (a) and (b) but incapable of breaking Si-C linkages therein; . (2) heating the mixture to an elevated temperature; and (3) maintaining the mixture at said elevated temperature for at least about 4 hours, whereby equilibration of (a) and (b) occurs to produce an equilibration product containing carboxyfunctional silicone glycol.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein (c) is trifluoromethane sulfonic acid and wherein, in step (2), the mixture is heated to a temperature of from about 40°C to about 65°C.
Claim 4
Dependent Claim
27 words
The method of claim 1 which includes the additional subsequent step of neutralizing acid catalyst (c) by the treatment of the equilibration product with a suitable base.
Claim 5
Dependent Claim
32 words
The method of claim 1 including the additional subsequent step of treating the carboxyfunctional silicone glycol in the equilibration product with a metal hydroxide to form the carboxylic acid saltsof said glycol.
Claim 6
Dependent Claim
44 words
The method of claim 1 wherein (a) and (b) are present in amounts which will result in an equilibration product comprising from about 0.5 to about 20 mole percent carboxyfunctional siloxane units, and from about 0.5 to about 20 mole percent silicone glycol units.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.