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US 7,582,700 B2Granted
Method for the production of emulsions of highly-viscous organopolysiloxanes
AssigneeWacker Chemie AG
InventorsChristian Herzig, Siegfried Dormeier
Life of this patent
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Abstract
Emulsions of highly viscous organopolysiloxanes are prepared by reacting organopolysiloxanes having at least one Si—OH group with alkoxysilanes bearing a group BReSi(OR3)3-e wherein R is a hydrocarbon radical and B is a radical —CR22—Y where Y is halogen, monosubstituted O or S or substituted N or P, the reaction taking place as a dispersion in water, optionally in the presence of an emulsifier.
Claims17
A process for preparing emulsions of highly viscous organopolysiloxanes having a viscosity of at least 10,000 mPa·s, comprising reacting
- siloxanes (1) comprising units of the formula
- A
- a
-
-
- R
- c
-
-
- (
- OR
- 1
- )
- d
-
-
- SiO
- 4
- -
- (
- a
- +
- c
- +
- d
- )
- 2
- (
- I
- )
- where
- A each independently is a monovalent, Si—C-bonded radical having basic nitrogen,
- R is each independently a monovalent, optionally substituted hydrocarbon radical having from 1 to 18 carbon atoms per radical,
- R1 are each independently a hydrogen atom or an alkyl radical having from 1 to 8 carbon atoms,
- a each independently is 0 or 1,
- c each independently is 0, 1, 2 or 3 and
- d each independently is 0 or 1,
- with the proviso that the sum of a+c+d is ≦3 and, on average, at least one A radical and at least one R1 radical where R1 is a hydrogen atom are present per molecule, siloxanes (2) composed of units of the formula
- R
- c
-
-
- (
- OR
- 1
- )
- d
-
-
- SiO
- 4
- -
- (
- c
- +
- d
- )
- 2
- (
- II
- )
- where R, R1, c and d are each as defined above, with the proviso that the sum of c+d is ≦3 and at least one R1 radical where R1 is a hydrogen atom are present per molecule,
- or a mixture of siloxanes (1) and (2),
- with silanes (3) of the formula
- BR3 Si(OR3)3-e (III)
- where
- B each independently is a monovalent radical of the formula —CR22—Y,
- R2 each independently is a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms,
- Y each independently is a monofunctional radical selected from the group consisting of the halogens, monosubstituted O and S atoms, and substituted N and P atoms,
- R3 each independently is an alkyl radical having from 1 to 8 carbon atoms per radical and
- e is 0, 1 or 2,
- in the presence of dispersion medium (4) and
- optionally emulsifiers (5).
70 more elements
Dependencies are inferred from the claim text.