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US 8,299,168 B2Granted
Siloxane-containing binder dispersions
AssigneeBayer MaterialScience AG
InventorsThomas Münzmay, Arno Nennemann, Markus Mechtel, Nusret Yuva, Meike Niesten
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Abstract
The invention relates to aqueous formulations comprising organic binders having a siloxane content and inorganic nanoparticles, a process for the preparation thereof and the use thereof for the preparation of aqueous coating compositions.
Claims18
An aqueous formulation comprising
- A) a copolymer a1) and a polyorganosiloxane a2) containing hydroxyl groups;
- B) inorganic particles comprising silica which have an average particle size (z-mean), as determined by means of dynamic light scattering in dispersion, of less than 200 nm, wherein said inorganic particles are optionally surface modified, wherein said inorganic particles are in colloidally disperse form in organic solvents or in water, and wherein said inorganic particles are stabilized against reagglomeration by the polyorganosiloxane a2);
- and
- C) water
- wherein said copolymer a1) is built up from
- I) a hydroxy-functional hydrophobic polymer containing as builder monomers
- Ia) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
- and
- Ib) hydroxy-functional monomers;
- and
- II) a hydroxy-functional hydrophilic polymer containing as builder components
- IIa) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
- IIb) hydroxy-functional monomers;
- and
- IIc) acid-functional monomers
- wherein said polyorganosiloxane a2) is selected from the group consisting of
- (1) compounds of formula (I)
- wherein
- X is an aliphatic, optionally branched C1 to C10 radical or
- a [—CH2—O—(CH2)p—]Si unit, wherein p in an integer from 1 to 4;
- R is a CH(OH)Y group, wherein
- Y is a —CH2—N(R2R3) group, wherein
- R2 is H, a methyl, ethyl, n-propyl, iso-propyl, or cyclohexyl radical, or a 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl radical;
- and
- R3 is a 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl radical;
- R1 represents a methyl group;
- and
- n is an integer from 4 to 12
- (2) compounds of formula (V)
- wherein
- m is an integer from 5 to 15;
- Z is H or methyl;
- and
- n and o are, identically or differently, integers from 1 to 12, and
- (3) a compound of formula (VI)
- wherein
- m is an integer from 5 to 15;
- and
- y is an integer from 2 to 4.
36 more elements
A process for producing an aqueous formulation comprising:
- A) providing a copolymer a1);
- B) providing a polyorganosiloxane a2) containing hydroxyl groups;
- C) mixing inorganic particles comprising silica with a1) and/or a2), wherein the inorganic particles have an average particle size (z-mean), as determined by means of dynamic light scattering in dispersion, of less than 200 nm, wherein said inorganic particles are optionally surface modified, and wherein said inorganic particles are in colloidally disperse form in organic solvents or in water;
- and
- D) mixing components a1) and a2) before or after mixing components a1) and/or a2) with the inorganic particles;
- wherein said copolymer a1) is built up from
- I) a hydroxy-functional hydrophobic polymer containing as builder monomers
- Ia) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
- and
- Ib) hydroxy-functional monomers;
- and
- II) a hydroxy-functional hydrophilic polymer containing as builder components
- IIa) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
- IIb) hydroxy-functional monomers;
- and
- IIc) acid-functional monomers
- wherein said polyorganosiloxane a2) is selected from the group consisting of
- (1) compounds of formula (I)
- wherein
- X is an aliphatic, optionally branched C1 to C10 radical or
- a [—CH2—O—(CH2)p—]Si unit, wherein p in an integer from 1 to 4;
- R is a CH(OH)Y group, wherein
- Y is a —CH2—N(R2R3) group, wherein
- R2 is H, a methyl, ethyl, n-propyl, iso-propyl, or cyclohexyl radical, or a 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl radical;
- and
- R3 is a 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl radical;
- R1 represent a methyl group;
- and
- n is an integer from 4 to 12
- (2) compounds of formula (V)
- wherein
- m is an integer from 5 to 15;
- Z is H or methyl;
- and
- n and o are, identically or differently, integers from 1 to 12, and
- (3) a compound of formula (VI)
- wherein
- m is an integer from 5 to 15;
- and
- y is an integer from 2 to 4.
37 more elements
Dependencies are inferred from the claim text.