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US 6,379,751 B1Granted
Imparting water-repellency with polysiloxanes containing carboxyl groups
AssigneeBayer Aktiengesellschaft
InventorsWalter Schäfer, Günter Sackmann, Jürgen Reiners, Tillmann Hassel, Manfred Schnee, Fritz Novotny
Life of this patent
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Abstract
The invention relates to polysiloxanes containing carboxyl groups that are useful for imparting water-repellency to substrates, a process for their preparation, a water-repellent system containing such polysiloxanes, and a process for the production of hydrophobic substrates.
Claims22
A water-repellent system comprising
- (a) a polysiloxane containing carboxyl groups wherein the polysiloxane chain contains
- at least one structural unit of the formula (1)
- [ARaSiO(3−a)/2]k (1)
- and/or at least one structural unit of the formula (2)
- [RcSiO(4−c)/2]n (2)
- and optionally at least one terminal group selected from the formulas
- R3SiO1/2 (3)
- and
- AR2SiO1/2 (3a),
- wherein
- A represents a radical containing carboxyl groups and has the formula
- wherein
- R1, R2, and R3, independently of one another, represent hydrogen or a monovalent C2-C60-hydrocarbon radical that optionally contains one or more non-neighboring ether, imino, amido, urea, urethane, ester, or carboxyl groups and that is optionally substituted by one or two carboxyl groups —COOM and/or one or two hydroxyl groups, wherein
- M represents hydrogen, Na+, K+, Li+, NH4+, or
- in which R4, R5 and R6, independently of one another, represent C1-C18-alkyl or substituted C1-C18-alkyl, or aralkyl,
- D and E, independently of one another, represent a divalent C2-C20-hydrocarbon radical that is optionally substituted by hydroxyl or interrupted by non-neighboring O atoms, and
- q represents 0 to 3, with the provisos that (i) A is substituted at least by one group COOM, (ii) R1 to
- R3, independently of one another, are linked to the nitrogen atom via a single bond or a group —COO—, —CO— or —CONH—, and (iii) R1 and R2 do not simultaneously represent H and are not simultaneously linked to the nitrogen atom via a carbonyl group,
- R represents a C1- to C12-alkyl radical or a phenyl radical,
- a represents 0 or 1,
- k represents 0 to 50,
- c represents 1 or 2, and
- n represents 10 to 1000,
- with the proviso that at least one terminal group of the formula (3a) is present where the polysiloxane chain contains only structural units of the formula (2), and
- (b) at least one component from the group B1 to B4, wherein
- B1 is an anionic copolymer,
- B2 is polyaspartic acid or a derivative thereof,
- B3 is a paraffin, and
- B4 is an isocyanate adduct.
26 more elements
A polysiloxane containing at least one structural unit of the formula (1d)
- [A1 RaSiO(3−a)/2]k (1d)
- and/or at least one structural unit of the formula (2)
- [RcSiO(4−c)/2]n (2)
- and optionally at least one terminal group selected from the formulas
- R3SiO1/2 (3)
- and
- A1R2SiO1/2 (3d),
- wherein
- A1 represents a radical selected from the group consisting of
- wherein
- M represents hydrogen, Na+, K+, Li+, NH4+, or
- in which R4, R5 and R6, independently of one another, represent C1-C18-alkyl or substituted C1-C18-alkyl, or aralkyl,
- R represents a C1- to C12-alkyl radical or a phenyl radical,
- a represents 0 or 1,
- k represents 0 to 50, and
- c represents 1 or 2.
13 more elements
Dependencies are inferred from the claim text.