Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for making an amino-functional polydiorganosiloxane using a removable solid catalyst

A technology of diorganosiloxane and aminoalkyl functional alkane, which is applied in the field of preparation of amino functional polydiorganosiloxane, and can solve problems such as harmful effects of stability

Active Publication Date: 2020-05-12
DOW SILICONES CORP
View PDF8 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for making an amino-functional polydiorganosiloxane using a removable solid catalyst
  • Method for making an amino-functional polydiorganosiloxane using a removable solid catalyst
  • Method for making an amino-functional polydiorganosiloxane using a removable solid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0055] 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, and C4) trimethylmethoxysilane.

[0056] Table 1: Solid Carboxylic Acid and Anhydride Precatalysts

[0057]

[0058]

[0059] *Dibasic acids can have two pKa values.

[0060] In this Example 1, 0.1% N amino functional polydimethylsiloxane was synthesized using benzoic acid as follows. Into the reactor, the following starting materials were charged (amounts are shown in parts by weight): A1) silanol-terminated PDMS with a viscosity of 70 cP (245), 3-aminopropylmethyldiethoxysilane (3.5) , and C6) HMDZ(0.5). The solution mixture in N 2 Heat to 90°C for 10 min un...

Embodiment approach

[0115] 1. The method for preparing aminofunctional polydiorganosiloxane comprises:

[0116] 1) Mixing the starting materials comprising

[0117] A) silanol functional polydiorganosiloxanes,

[0118] B) aminoalkyl functional alkoxysilanes,

[0119] 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

[0120] C) 0% to 0.5% of a capping agent having a triorganosilyl group based on the combined weight of all starting materials; and thereafter

[0121] 2) providing the starting material D) from 0.01% to 5% of solid carboxylic acid based on the weight of the starting material B), thereby forming a reaction mixture;

[0122] 3) mixing the reaction mixture and heating under conditions to form a reaction product;

[0123] 4) Removal of all or a portion of the residual acid, thereby reducing the amount of said residual acid to 0 to <500 ppm based on the weight of the aminofunctional polydiorgan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to View More

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 / 678,430, filed May 31, 2018. US Provisional Patent Application Serial No. 62 / 678430 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] Aminofunctional polydiorganosiloxanes are useful as conditioners 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 side groups to randomly distributed silicon atoms in the main chain of the siloxane chain. [0005] unresolved issues [0006] Carboxylic acid-catalyzed condensation rea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08L83/04C08G77/388
CPCC08G77/16C08G77/388C08L83/04C08K5/544C08K5/09C08G77/08C08L83/08
Inventor N·萨斯艾旺查隆K·阮H·韦奇
Owner DOW SILICONES CORP