Aqueous dispersions of organosilicon compounds

Patent metadata

Field	Value
Publication number	US-10584244-B2
Application number	US-201615549613-A
Country	US
Kind code	B2
Filing date	Feb 4, 2016
Priority date	Feb 9, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

Aqueous dispersions which are storage stable and cure to tack-free elastomers upon removal of water contain water, alkoxysilyl-terminated polyethers and alkoxy-functional siloxanes, optionally catalysts, fillers, and other additives customary in dispersions of organosilicon compounds.

First claim

The invention claimed is:

1. A aqueous dispersion, comprising:
(A) at least one silyl-terminated polymer of the formula

where
R 1 are identical or different and are monovalent, optionally substituted, SiC-bonded hydrocarbyl radicals,
R 2 are identical or different and are hydrogen or monovalent, optionally substituted hydrocarbyl radicals,
X are identical or different and are —O—, —NR 3 where R 3 is hydrogen, or an aliphatically saturated or aromatic hydrocarbyl radical having 1 to 12 carbon atoms,
Y are identical or different and are radicals —(CH 2 ) 3 —,
—(CH 2 ) 3 NHC(═O)—, —CH 2 —, or —CH 2 NHC(═O)—,
M are identical or different and are radicals —CH 2 CH 2 —,
—CH 2 CH(CH 3 )—, —(CH 2 ) 4 —, or —(CH 2 ) 6 —,
n is 0 or 1, and
m is an integer from 50 to 500,
(B) organosilicon compounds comprising units of the formula
R 4 a (R 5 O) b SiO (4-a-b)/2   (II),

where
R 4 are identical or different and are monovalent, optionally substituted SiC-bonded hydrocarbyl radicals,
R 5 are identical or different and are hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
a is 0, 1, 2 or 3,
b is 0, 1, 2 or 3,
with the provisos that the sum a+b≤3, there are at least two groups —OR 5 per molecule, and a is 0 or 1 in at least 40% of all units of the formula (II),
(C) emulsifiers,
(D) water,
(E) optionally catalysts,
(F) optionally fillers, and
(G) optionally further additives,
wherein when any of R 1 , R 2 , R 4 or R 5 are substituted, the substituents are halogen, amine, or epoxy substituents, and
wherein components (A) and (B) crosslink upon partial or complete removal of water.

2. The aqueous dispersion of claim 1 , wherein at least 90% of all radicals M in component (A) have the definition of —CH 2 CH(CH 3 )—.

3. The aqueous dispersion of claim 1 , wherein in silicon compounds (B), a is 1 in at least 50% of all units of the formula (II).

4. The aqueous dispersion of claim 2 , wherein in silicon compounds (B), a is 1 in at least 50% of all units of the formula (II).

5. The aqueous dispersion of claim 1 , wherein catalyst (E) comprises carboxylic acids, dicarboxylic acids, organophosphoric acid and monoesters and diesters thereof, phosphonic acids and the monoesters thereof, diorganophosphinic acids, organic nitrogen compounds, or salts of the acids with the organic nitrogen compounds, and mixtures thereof.

6. The aqueous dispersion of claim 1 , wherein the dispersion comprises,
based in each case on 100 parts by weight of the total weight of components (A) and (B),
2 to 10 parts by weight of component (C),
20 to 100 parts by weight of component (D),
10 to 50 parts by weight of component (F),
optionally 0.001 to 2 parts by weight of component (E), and
optionally 0.0005 to 2 parts by weight of at least one component (G) which are preservatives and/or light stabilizers,
with the proviso that the weight ratio of component (B) to component (A) is in the range from 0.1:1 to 1:1.

7. The aqueous dispersion of claim 1 , wherein the dispersion comprises,
based in each case on 100 parts by weight of the total weight of components (A) and (B),
2 to 10 parts by weight of component (C),
20 to 100 parts by weight of component (D),
600 to 1400 parts by weight of component (F),
optionally 0.001 to 2 parts by weight of component (E), and
optionally 0.0005 to 2 parts by weight of at least one component (G) which is a preservative,
with the proviso that the weight ratio of component (B) to component (A) is 1:1 to 10:1.

8. A method for producing a aqueous dispersion of claim 1 , comprising mixing components (A), (B), and (C) and further components and subsequently emulsifying the resulting mixture by adding water (D) and also component (C) and optionally further components.

9. The method of claim 8 , in which
in a 1st step
components (A) and (B) are mixed by stirring and/or homogenizing,
in a 2nd step
components (C) and (D) are added to the mixture obtained in the 1st step, and an emulsion is produced by rapid stirring,
optionally in a 3rd step
further water (D) is added, and
optionally in a 4th step
further substances are mixed in, optionally as a premix with further water (D).

10. A shaped article produced by crosslinking an aqueous dispersion of claim 1 .

11. A shaped article produced by crosslinking an aqueous dispersion prepared by the method of claim 8 .

12. A shaped article produced by crosslinking an aqueous dispersion prepared by the method of claim 9 .

13. The shaped particle of claim 10 , which is a coating or sealant.

14. The aqueous dispersion of claim 1 , wherein the organosilicon compounds (B) have a weight average molecular weight of from 500 g/mol to 9000 g/mol.

15. The aqueous dispersion of claim 1 , wherein the organosilicon compounds (B) have a polydispersity of 1 to 4.

16. The aqueous dispersion of claim 1 , wherein at least one of R 1 , R 2 , or R 4 is a 3-aminopropyl or a 3-(2-aminoethyl)aminopropyl radical.

17. The aqueous dispersion of claim 1 , wherein at least one of R 1 , R 2 , or R 4 is 3-glycidoxypropyl.

18. The aqueous dispersion of claim 1 , wherein at least one of R 1 , R 2 , or R 4 is substituted by fluorine.

Assignees

• Wacker Chemie Ag

Inventors

• Scheim Uwe
• Kauschke Marco
• Marrack Stephan
• Prasse Marko
• Rautschek Holger

Classifications

• C08G77/46 Primary

  containing polyether sequences · CPC title

• C08L83/12 Primary

  containing polyether sequences · CPC title

• C09D183/10 Primary

  Block or graft copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09D151/08, C09D153/00) · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C09D183/12

  containing polyether sequences · CPC title