Use of water-insoluble polyoxyalkylene-polysiloxane block copolymers for defoaming aqueous media
AssigneeGoldschmidt GmbH
InventorsThomas Ebbrecht, Wolfgang Josten, Michael Keup, Stefan Silber, Roland Sucker
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Abstract
The invention relates to the use of water-insoluble polyoxyalkylene-polysiloxane block copolymers of the general average formula wherein the variables and indices are described herein as defoaming agents for aqueous media. This invention also provides for defoaming compositions comprising said water-insoluble polyoxyalkylene-polysiloxane block copolymers as well as coating materials, printing inks and cooling lubricants containing the inventive defoaming compositions.
Claims5
A defoaming composition which comprises a water-insoluble polyoxyalkylene-polysiloxane block copolymer of the average general formula
- where
- R1 and/or R7 are R2 or —[R4]w—[R5]x—R6—R8,
- R2 and R3 are identical or different alkyl radicals or are unsubstituted or substituted aryl radicals,
- R4 is a divalent radical of the formula —O—, —NH—, —NR2—, —S—or of the formula
- —[O—Si(CH3)2]u—,
- where
- u is from 2 to 200,
- R5 is identical or different alkylene radicals having 1 to 24 carbon atoms, or is
- —CnH2n-fR2f—O—CmH2m-gR2g—,
- where,
- f is from 0 to 12,
- g is from 0 to 12,
- n is from 1 to 18,
- m is from 1 to 18,
- R6 is identical or different radicals of the general formula
- —O—(C2H4O)a(CH2—CH(CH3)O)b(CH2—CR9R10O)c—,
- where
- R9 and R10 are a methyl radical, or R9 is a hydrogen atom and R10 is an ethyl radical, but where, taking into account all radicals R6, the proportion of C2H4O groups among the total of all radicals
- R6 does not exceed 40% by weight,
- a is from 2 to 30,
- b is from 2 to 50,
- c is from 2 to 40, and
- the sum (a+b+c) is from 6 to 100
- and the sequence of the individual polyoxyalkylene segments —(C2H4O)a— and —(CH2—CH(CH3)O)b— and —(CH2CR9R10O)c— is either random or block or combination thereof,
- R8 is a hydrogen, a substituted or unsubstituted alkyl radical or an acyl radical,
- v is from 3 to 200,
- w is 0 or 1,
- x is 0 or 1,
- y is from 0 to 200,
- and, if y is 0, R1 and/or R7 are/is —[R4]w—[R5]x—R6—R8;
- a nonionic ethoxylate having a HBL from 8 to 11 and, optionally, a solid;
- whereby said polysiloxane block copolymer is greater than 90% by weight of all polysiloxane block copolymers in the defoaming composition.
A cooling lubricant which comprises a cooling lubricant and a defoaming effective amount of a defoaming composition which comprises a water-insoluble polyoxyalkylene-polysiloxane block copolymer of the average general formula
- where
- R1 and/or R7 are R2 or —[R4]w—[R5]x—R6—R8,
- R2 and R3 are identical or different alkyl radicals or are unsubstituted or substituted aryl radicals,
- R4 is a divalent radical of the formula —O—, —NH—, —NR2—, —S— or of the formula
- —[O—Si(CH3)2]u—,
- where
- u is from 2 to 200,
- R5 is identical or different alkylene radicals having 1 to 24 carbon atoms, or is
- —CnH2n-fR2f—O—CmH2m-gR2g—,
- where,
- f is from 0 to 12,
- g is from 0 to 12,
- n is from 1 to 18,
- m is from 1 to 18,
- R6 is identical or different radicals of the general formula
- —O—(C2H4O)a(CH2—CH(CH3)O)b(CH2-CR9R10O)c—,
- where
- R9 and R10 are a methyl radical, or R9 is a hydrogen atom and R10 is an ethyl radical, but where, taking into account all radicals R6, the proportion of C2H4O groups among the total of all radicals
- R6 does not exceed 40% by weight,
- a is from 2 to 30,
- b is from 2 to 50,
- c is from 2 to 40, and
- the sum (a+b+c) is from 6 to 100
- and the sequence of the individual polyoxyalkylene segments —C2H4O)a— and —(CH2—CH(CH3)O)b— and —(CH2CR9R10O)c— is either random or block or combination thereof,
- R8 is a hydrogen, a substituted or unsubstituted alkyl radical or an acyl radical,
- v is from 3 to 200,
- w is 0 or 1,
- x is 0 or 1,
- y is from 0 to 200,
- and, if y is 0, R1 and/or R7 are/is —[R4]w—[R5]x—R6—R8;
- whereby said polysiloxane block copolymer is greater than 90% by weight of all polysiloxane block copolymers in the defoaming composition.
A polymer dispersion which comprises a polymer dispersion and a defoaming effective amount of a defoaming composition which comprises a water-insoluble polyoxyalkylene-polysiloxane block copolymer of the average general formula
- where
- R1 and/or R7 are R2 or —[R4]w—[R5]x—R6—R8,
- R2 and R3 are identical or different alkyl radicals or are unsubstituted or substituted aryl radicals,
- R4 is a divalent radical of the formula —O—, —NH—, —NR2—, —S— or of the formula
- —[O—Si(CH3)2]u—,
- where
- u is from 2 to 200,
- R5 is identical or different alkylene radicals having 1 to 24 carbon atoms, or is
- —CnH2n-fR2f—O—CmH2m-gR2g—,
- where,
- f is from 0 to 12,
- g is from 0 to 12,
- n is from 1 to 18,
- m is from 1 to 18,
- R6 is identical or different radicals of the general formula
- —O—(C2H4O)a(CH2—CH(CH3)O)b(CH2-CR9R10O)c—,
- where
- R9 and R10 are a methyl radical, or R9 is a hydrogen atom and R10 is an ethyl radical, but where, taking into account all radicals R6, the proportion of C2H4O groups among the total of all radicals
- R6 does not exceed 40% by weight,
- a is from 2 to 30,
- b is from 2 to 50,
- c is from 2 to 40, and
- the sum (a+b+c) is from 6 to 100
- and the sequence of the individual polyoxyalkylene segments —(C2H4O)a— and —(CH2—CH(CH3)O)b— and —(CH2CR9R10O)c— is either random or block or combination thereof,
- R8 is a hydrogen, a substituted or unsubstituted alkyl radical or an acyl radical,
- v is from 3 to 200,
- w is 0 or 1,
- x is 0 or 1,
- y is from 0 to 200,
- and, if y is 0, R1 and/or R7 are/is —[R4]w—[R5]x—R6—R8;
- whereby said polysiloxane block copolymer is greater than 90% by weight of all polysiloxane block copolymers in the defoaming composition.
A coating material or a printing ink which comprises a coating material or a printing ink and a defoaming effective amount of a defoaming composition which comprises a water-insoluble polyoxyalkylene-polysiloxane block copolymer of the average general formula
- where
- R1 and/or R7 are R2 or —[R4]w—[R5]x—R6—R8,
- R2 and R3 are identical or different alkyl radicals or are unsubstituted or substituted aryl radicals,
- R4 is a divalent radical of the formula —O—, —NH—, —NR2—, —S— or of the formula
- —[O—Si(CH3)2]u—,
- where
- u is from 2 to 200,
- R5 is identical or different alkylene radicals having 1 to 24 carbon atoms, or is
- —CnH2n-fR2f—O—CmH2m-gR2g—,
- where,
- f is from 0 to 12,
- g is from 0 to 12,
- n is from 1 to 18,
- m is from 1 to 18,
- R6 is identical or different radicals of the general formula
- —O—(C2H4O)a(CH2—CH(CH3)O)b(CH2-CR9R10O)c—,
- where
- R9 and R10 are a methyl radical, or R9 is a hydrogen atom and R10 is an ethyl radical, but where, taking into account all radicals R6, the proportion of C2H4O groups among the total of all radicals
- R6 does not exceed 40% by weight,
- a is from 2 to 30,
- b is from 2 to 50,
- c is from 2 to 40, and
- the sum (a+b+c) from 6 to 100
- and the sequence of the individual polyoxyalkylene segments —(C2H4O)a— and —(CH2—CH(CH3)O)b— and —(CH2CR9R10O)c— is either random or block or combination thereof,
- R8 a hydrogen, a substituted or unsubstituted alkyl radical or an acyl radical,
- v is from 3 to 200,
- w is 0 or 1,
- x is 0 or 1,
- y is from 0 to 200,
- and, if y is 0, R1 and/or R7 are/is —[R4]w—[R5]x—R6—R8;
- whereby said polysiloxane block copolymer is greater than 90% by weight of all polysiloxane block copolymers in the defoaming composition.
Dependencies are inferred from the claim text.