Aqueous emulsions of oxamidoester-functionalized organopolysiloxanes

Patent metadata

Field	Value
Publication number	US-11613672-B2
Application number	US-201816755071-A
Country	US
Kind code	B2
Filing date	Aug 10, 2018
Priority date	Aug 10, 2018
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

Aqueous emulsions contain (A) oxamidoester-functionalized organopolysiloxanes having units of the formula

R 1 a (OR 2 ) b Z c SiO (4−a−b−c)/2   (I)

where

Z is a group of the formula

—Y—NR X —CO—CO—O—R 3   (II),

with the proviso that the sum a+b+c is ≤3 and each molecule contains at least one radical Z.

(B) emulsifiers and

(C) water.

First claim

The invention claimed is:

1. Aqueous emulsions comprising:
(A) oxamidoester-functionalized organopolysiloxanes comprising units of the formula
R 1 a (OR 2 ) b Z c SiO (4−a−b−c)/2   (I)

where
R 1 are identical or different and represent a monovalent, optionally substituted, SiC-bonded hydrocarbon radical,
R 2 are identical or different and represent hydrogen or a monovalent, optionally substituted hydrocarbon radical,
a is 0, 1, 2 or 3,
b is 0, 1, 2 or 3,
c is 0 or 1 and
Z is a group of the formula
—Y—NR X —CO—CO—O—R 3   (II),

where
R 3 represents hydrogen or a monovalent, optionally substituted hydrocarbon radicas optionally interrupted by oxygen atoms,
R x represents hydrogen or an optionally substituted hydrocarbon radical and
Y represents divalent, optionally substituted hydrocarbon radicals optionally interrupted by oxygen atoms,
with the proviso that the sum a+b+c is ≤3 and each molecule contains at least one radical Z,
(B) emulsifiers, and
(C) water; wherein the siloxane (A) is an oxamidoester-functionalized polydiorganosiloxanes of the formula
[R 1 2 ZSiO 1/2 ] 2 [R 1 2 SiO 2/2 ] m   (III),

where
R 1 , R 2 and Z are as defined above, and
m is an integer and is at least 30.

2. An aqueous emulsion of claim 1 , containing siloxane(s) (A) in amounts of 5% to 50% by weight.

3. An aqueous emulsion of claim 1 , wherein the emulsifier(s) (B) is/are nonionic emulsifiers.

4. An aqueous emulsion of claim 1 , containing emulsifier(s) (B) in amounts of 0.5% to 20% by weight.

5. An aqueous emulsion according to claim 1 , containing water (C) in amounts of 1% to 95% by weight.

6. An aqueous emulsion of claim 1 , which is an emulsion comprising
(A) siloxanes comprising units of the formula (I),
(B) nonionic emulsifiers,
(C) water,
optionally (D) co-emulsifiers,
optionally (E) non-aqueous solvents and
optionally (F) one or more auxiliaries selected from the group consisting of pH regulators, salts, foam inhibitors, thickeners and/or protective colloids, preservatives, disinfectants, wetting agents, corrosion inhibitors, dyes, and fragrances.

7. An aqueous emulsion of claim 1 , which has a viscosity at 25° C. of not more than 50,000 mPas.

8. An aqueous emulsion of claim 1 , having a solids content of not less than 20% by weight.

9. A method for preparing an emulsion of claim 6 , comprising stirring together all the constituents in any desired order.

10. The method of claim 9 , wherein the oxamidoester-functionalized polydiorganosiloxanes (A) are intensively intermixed in water (C) with the emulsifiers (B), optionally the co-emulsifiers (D), optionally the non-aqueous solvent (E) and optionally the auxiliary substances (F).

Assignees

• Wacker Chemie Ag

Inventors

• Schaefer Oliver
• Gratzl Petra

Classifications

• C08J3/03

  in aqueous media · CPC title

• C08J2383/08

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• C08G77/388 Primary

  containing nitrogen · CPC title

• C09D183/08 Primary

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• D06M15/643

  containing silicon in the main chain · CPC title