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Polysiloxanes and their preparation

a technology of polysiloxanes and polysiloxanes, applied in the field of polysiloxanes and their preparation, can solve the problems of generating trialkylamine odour in the product, affecting certain applications, and consuming a lot of residual barium,

Inactive Publication Date: 2004-10-21
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The process of the invention has the advantage that the amino-functional polysiloxane reaction product does not contain unwanted catalyst residues. The amine carboxylate salt which acts as catalyst is incorporated in the amino-functional polysiloxane as amine units which are in carboxylate salt form. The amine carboxylate salt is an excellent catalyst for the reaction between SiOH groups and Si-bonded alkoxy groups, and is also a good catalyst for the siloxane chain extending reaction of SiOH groups with SiOH groups. The amino-functional polysiloxane reaction product does not require filtration, nor does it require heat treatment to decompose the ammonium salt catalyst, which has the risk of generating trialkylamine odour in the product. The amino-functional polysiloxane can be prepared as a clear liquid reaction product which is ready for use in many applications.

Problems solved by technology

Residual barium is often present in materials made via this route due to complexation with amine functionality.
This may be detrimental in certain applications.
The amino-functional polysiloxane reaction product does not require filtration, nor does it require heat treatment to decompose the ammonium salt catalyst, which has the risk of generating trialkylamine odour in the product.

Method used

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  • Polysiloxanes and their preparation
  • Polysiloxanes and their preparation
  • Polysiloxanes and their preparation

Examples

Experimental program
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Effect test

example 1

[0032] A silanol end-blocked with a viscosity of approximately 60 cP (90 g), aminoethyl-aminoisobutyl methyl dimethoxy silane (5.0 g), acetic acid (0.5 g) and a C.sub.13-C.sub.15 aliphatic alcohol (5.1 g) were charged to a three necked flask fitted with a condenser and thermometer, upon which they were heated to 85.degree. C. for two hours under nitrogen. The reaction mixture was then devolatilised at 85.degree. C. under reduced pressure (100 mbar) for four hours. The resulting hazy fluid was an amino-functional polydimethylsiloxane copolymer end capped with a mixture of C.sub.13-C.sub.15 alkoxy, methoxy and silanol end groups. The polymer had a viscosity of 1265 cP.

example 2

[0033] A silanol end-blocked polydimethylsiloxane with a viscosity of approximately 60 cP (90.2 g), aminoethyl-aminoisobutyl methyl dimethoxy silane (5.2 g), octanoic acid (1.0 g) and a C.sub.13-C.sub.15 aliphatic alcohol (5.1 g) were charged to a three necked flask fitted with a condenser and thermometer, upon which they were heated to 85.degree. C. for one hour under nitrogen. The reaction mixture was then devolatilised at 85.degree. C. under reduced pressure (25 mbar) for one hour. The resulting clear fluid was an amino-functional polydimethylsiloxane copolymer end capped with a mixture of C.sub.13-C.sub.15 alkoxy, methoxy and silanol end groups. The polymer had a viscosity of 798 cP.

example 3

[0034] A silanol end-blocked polydimethylsiloxane with a viscosity of approximately 60 cP (80 g), aininoethyl-aminoisobutyl methyl dimethoxy silane (5.2 g), octanoic acid (1.0 g) and a C.sub.13-C.sub.15 aliphatic alcohol (15 g) were charged to a three necked flask fitted with a condenser and thermometer, upon which they were heated to 85.degree. C. for two hours under nitrogen. The reaction mixture was then devolatilised at 85.degree. C. under reduced pressure (50 mbar) for two hours. The resulting clear fluid was an amino-functional polydimethylsiloxane copolymer end capped with a mixture of C.sub.13-C.sub.15 alkoxy, methoxy and silanol end groups. The polymer had a viscosity of 586 cP.

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Abstract

An amino-functional polysiloxane is prepared by reacting an aminosilane (A) which contains an aminoalkyl group and at least one alkoxy group bonded to Si with a carboxylic acid and a silanol-functional polysiloxane (B). The aminosilane (A) is partially converted into its carboxylate salt which acts as a catalyst for the siloxane condensation polymerization reaction between (A) and (B).

Description

[0001] This invention relates to amino-functional polysiloxanes and to their preparation and to polysiloxane compositions containing them.BACKGROUND TO THE INVENTION[0002] Amino-functional polysiloxanes are widely used in the textile industry as fibre lubricants and as fabric softeners and anti-wrinkle agents, and are also used in the personal care industry as hair conditioners and in skin care compositions.[0003] Amino-functional polysiloxanes can be prepared by mixing a catalyst comprising both (i) at least one compound selected from barium hydroxide and strontium hydroxide and (ii) at least one compound selected from borates and phosphates of sodium with a silanol terminated organopolysiloxane compound and an organosilicon compound having at least one silicon-bonded alkoxy or alkoxyalkoxy group and an aminoalkyl group and reacting at a temperature of at least 50.degree. C., as described in U.S. Pat. No. 5,391,675. This process is effective in preparing the amino-functional polysi...

Claims

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Application Information

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IPC IPC(8): A61K8/89A61K8/72A61Q5/00C08G77/08C08G77/26
CPCC08G77/08C08G77/26C08G77/16C08G77/388C08L83/04C08K5/544C08K5/09
Inventor HUPFIELD, PETER CHESHIRESURGENOR, AVRILWESTALL, STEPHEN
Owner DOW CORNING CORP