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Method for making amino-functional polydiorganosiloxane using removable acid catalysit

A diorganosiloxane, amino-functional technology, applied in the field of preparation of amino-functional polydiorganosiloxane, can solve the problems of stability and harmful effects

Active Publication Date: 2020-05-19
DOW SILICONES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in known processes, the carboxylic acid or its carboxylate, or both, remains the "active catalyst" in the polyorganosiloxane throughout its shelf life, and this can have a detrimental effect on stability

Method used

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  • Method for making amino-functional polydiorganosiloxane using removable acid catalysit
  • Method for making amino-functional polydiorganosiloxane using removable acid catalysit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Some embodiments of the invention will now be described in detail in the following examples. The following starting materials were used in these examples: A1) silanol-terminated PDMS with a viscosity of 70 cP, A2) silanol-terminated PDMS with a viscosity of 30 cP, B2) 3-aminopropylmethyldiethoxysilane, B3 )aminoethyl-aminoisobutylmethyldimethoxysilane, B5) 3-aminopropyldimethylethoxysilane, C6) HMDZ, C4) trimethylmethoxysilane, D1) acetic acid, D2) Propionic acid, D') octanoic acid (comparator, not removable), and D") lactic acid (comparator, not removable).

[0050] In this Example 1, a low viscosity 0.1% N aminofunctional polydimethylsiloxane was synthesized as follows. Into a reaction vessel, charged the following (amounts are shown in parts by weight): A1) silanol-terminated PDMS (244-270), B2) 3-aminopropylmethyldiethoxysilane (3.45-3.79) , and C6) HMDZ(1). The resulting mixture was placed in N 2 Heat to 90°C under purge for 10 minutes. After 10 min, D2) propi...

Embodiment approach

[0100] In a first embodiment, a method for preparing an aminofunctional polydiorganosiloxane comprising:

[0101] 1) Mixing starting materials comprising:

[0102] A) silanol functional polydiorganosiloxanes,

[0103] B) aminoalkyl-functional alkoxysilanes,

[0104] wherein the amount of starting substances A) and B) is such that there is a molar excess of silanol groups relative to the alkoxy groups, and

[0105] C) 0% to 0.5% of a capping agent having a triorganosilyl group based on the combined weight of all starting materials; and thereafter

[0106] 2) adding starting substance D) from 0.01% to 5% by weight of starting substance B) of a carboxylic acid having a boiling temperature of 90° C. to 150° C. and a pKa value of 1 to 5; thereby forming a reaction mixture;

[0107] 3) The reaction mixture is mixed and heated to form a reaction product and reduce the amount of residual acid to 0 to <500 ppm based on the weight of the aminofunctional polydiorganosiloxane.

[010...

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Abstract

A method for preparing an amino-functional polydiorganosiloxane employs a removable catalyst. The method differs from previous methods in the selection of catalyst, order of addition of catalyst withrespect to other starting materials, and catalyst removal.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application Serial No. 62 / 678,425, filed May 31, 2018. US Provisional Patent Application Serial No. 62 / 678425 is hereby incorporated by reference. technical field [0003] The present invention relates to a process for the preparation of amino-functional polydiorganosiloxanes via condensation reactions. More specifically, methods for preparing aminofunctional polydiorganosiloxanes employ removable catalysts. Background technique [0004] The aminofunctional polydiorganosiloxanes are useful as conditioning agents in hair care applications or as softeners in textile applications. The amino groups can be attached to the terminal silicon atoms of the polydiorganosiloxane, or as pendant groups to randomly distributed silicon atoms within the main chain of the siloxane chain. [0005] unresolved issues [0006] Carboxylic acid-catalyz...

Claims

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Application Information

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IPC IPC(8): C08K5/544C08G77/388C08G77/08
CPCC08G77/08C08G77/16C08G77/388C08G77/26
Inventor N·萨斯艾旺查隆K·阮H·韦奇
Owner DOW SILICONES CORP