Use of silicone resins as dispersants
AssigneeGoldschmidt GmbH
InventorsPetra Brandt, Kathrin Lehmann, Sascha Oestreich, Cornelia Schröter, Stefan Silber
Life of this patent
Estimating the term…
Abstract
The invention provides for the use of silicone resins obtainable by reacting a) an alkoxysiloxane of the general formula R a 2 Si ( OR 1 ) b O 4 - ( a + b ) 2 with b) one or more hydroxyl-containing polyesters, and if desired c) one or more low molecular weight alcohols, it being possible for the alkoxysilane to be reacted partially and completely, based on the amount of (OR1) groups in a), but the reaction being taken at least to the point where a clear solution is obtained, as dispersants for solids for producing coatings, printing inks and/or print varnishes.
Claims20
A method for dispersing a pigment in a medium which comprises adding to said medium at least one silicone resin which is obtained by reacting
- a) an alkoxysiloxane of the general formula
- R
- a
- 2
-
- Si
-
- (
- OR
- 1
- )
- b
-
- O
- 4
- -
- (
- a
- +
- b
- )
- 2
- where
- R1 is a lower alkyl group,
- R2 is an alkyl or phenyl group,
- a is from 1.0 to 1.2,
- b is from 0.5 to 1.0,
- with the proviso that at least 50% by weight corresponds to the formula
- [R2Si(OR1)O]n, n=3 to 8,
- with
- b) one or more hydroxyl-containing polyesters,
- and, optionally,
- c) one or more low molecular weight alcohols,
- wherein it is possible for the alkoxysiloxane to be reacted partly or fully, based on the amount of (OR1) groups in a), but the reaction being taken at least to the point where a clear solution is obtained.
A pigment paste which comprises at least one pigment and a silicone resin obtained by reacting
- a) an alkoxysiloxane of the general formula
- R
- a
- 2
-
- Si
-
- (
- OR
- 1
- )
- b
-
- O
- 4
- -
- (
- a
- +
- b
- )
- 2
- where
- R1 is a lower alkyl group,
- R2 is an alkyl or phenyl group,
- a is from 1.0 to 1.2,
- b is from 0.5 to 1.0,
- with the proviso that at least 50% by weight corresponds to the formula
- [R2Si(OR1)O]n, n=3 to 8,
- with
- (b) one or more hydroxyl-containing polyesters derived from at least one hydroxycarboxylic acid and/or the corresponding lactone, and at least one diol,
- c) one or more low molecular weight alcohols,
- wherein it is possible for the alkoxysiloxane to be reacted partly or fully, based on the amount of (OR1) groups in a), but the reaction being taken at least to the point where a clear solution is obtained.
A printing ink or paint varnish which comprises a pigment and/or dye, optionally a solvent, and at least one silicone resin obtained by reacting
- a) an alkoxysiloxane of the general formula
- R
- a
- 2
-
- Si
-
- (
- OR
- 1
- )
- b
-
- O
- 4
- -
- (
- a
- +
- b
- )
- 2
- where
- R1 is a lower alkyl group,
- R2 is an alkyl or phenyl group,
- a is from 1.0 to 1.2,
- b is from 0.5 to 1.0,
- with the proviso that at least 50% by weight corresponds to the formula
- [R2Si(OR1)O]n, n=3 to 8,
- with
- (b) one or more hydroxyl-containing polyesters derived from at least one hydroxycarboxylic acid and/or the corresponding lactone, and at least one diol,
- c) one or more low molecular weight alcohols,
- wherein it is possible for the alkoxysiloxane to be reacted partly or fully, based on the amount of (OR1) groups in a), but the reaction being taken at least to the point where a clear solution is obtained.
A coating which comprises at least one solid, optionally a solvent, and at least one silicone resin obtained by reacting
- a) an alkoxysiloxane of the general formula
- R
- a
- 2
-
- Si
-
- (
- OR
- 1
- )
- b
-
- O
- 4
- -
- (
- a
- +
- b
- )
- 2
- where
- R1 is a lower alkyl group,
- R2 is an alkyl or phenyl group,
- a is from 1.0 to 1.2,
- b is from 0.5 to 1.0,
- with the proviso that at least 50% by weight corresponds to the formula
- [R2Si(OR1)O]n, n=3 to 8,
- with
- (b) one or more hydroxyl-containing polyesters derived from at least one hydroxycarboxylic acid and/or the corresponding lactone, and at least one diol,
- c) one or more low molecular weight alcohols,
- wherein it is possible for the alkoxysiloxane to be reacted partly or fully, based on the amount of (OR1) groups in a), but the reaction being taken at least to the point where a clear solution is obtained.
Dependencies are inferred from the claim text.