MICROCAPSULE DISPERSION COMPRISING MICROCAPSULES WITH A HYDROPHILIC CAPSULE CORE

• US 20130157863A1
• Filed: 12/17/2012
• Published: 06/20/2013
• Est. Priority Date: 12/19/2011
• Status: Abandoned Application

• Current Assignee: BASF SE
• Original Assignee: Peter Hahn
• Inventors: Brym, Markus, Keller, Harald, Nitschke, Christian, Willax, Hans, Katz, Britta, Brust, Jutta, Schroeder-Grimonpont, Tina, Rieger, Ralph, HAHN, Peter, Klein, Regina
• Application Number:
  US13/716,827
• Publication Number:
  US 20130157863A1
• Time in Patent Office: Days
• US Class Current: 504/359
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C08L 33/26 Homopolymers or copolymers of acrylamide or methacrylamide
• CPC Class Codes: C08L 39/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions of derivatives of such polymers
• CPC Class Codes: C09J 133/066 containing -OH groups

Abstract

The present invention relates to microcapsule dispersions comprising microcapsules comprising a hydrophilic capsule core and a capsule wall polymer which is obtainable by polymerization of a monomer composition comprising

• 25 to 95% by weight of one or more C₁-C₂₄-alkyl and/or glycidyl esters of acrylic acid and/or methacrylic acid
• 5 to 75% by weight of one or more hydrophilic monomers selected from acrylic acid esters and/or methacrylic acid esters which carry hydroxy and/or carboxy groups, and allylgluconamide
• 0 to 40% by weight of one or more compounds having two or more ethylenically unsaturated radicals,
  where the microcapsules are dispersed in a hydrophobic diluents, to the microcapsules, and to a method for producing them and to their use for the delayed release of active ingredients for construction, cosmetics or crop protection applications.

Claims

1. A microcapsule dispersion comprising microcapsules comprising a hydrophilic capsule core and a capsule wall polymer which is obtainable by polymerization of a monomer composition comprisingto 95% by weight of one or more C₁-C₂₄-alkyl and/or glycidyl esters of acrylic acid and/or methacrylic acid

5 to 75% by weight of one or more hydrophilic monomers selected from acrylic acid esters and/or methacrylic acid esters which carry hydroxy and/or carboxy groups, and allyigluconamide

0 to 40% by weight of one or more compounds having two or more ethylenically unsaturated radicals,

where the microcapsules are dispersed in a hydrophobic diluent.

2. The microcapsule dispersion according to claim 1, wherein the hydrophilic capsule core of the microcapsules is selected from water, and aqueous solutions of organic acids, and salts thereof, inorganic acids and inorganic salts and of sodium silicate.

3. The microcapsule dispersion according to claim 1 or 2, wherein the monomer composition comprises methyl methacrylate.

4. The microcapsule dispersion according to any one of claims 1 to 3, wherein the hydrophilic monomer is selected from hydroxyalkyl acrylates, hydroxyalkyl methacrylates, acrylamidoalkyl-polyhydroxy acid amides, methacrylamidoalkyl-polyhydroxy acid amides, N-acryl-glycosylamines and N-methacryl-glycosylamines.

5. The microcapsule dispersion according to any one of claims 1 to 4, obtainable by preparing a water-in-oil emulsion comprising hydrophobic diluent as continuous phase, and the hydrophilic capsule core material and the monomer composition and subsequent free-radical polymerization of the monomers to form the capsule wall polymer.

6. The microcapsule dispersion according to any one of claims 1 to 5, wherein the hydrophobic diluent has a solubility in water <

0.5 g/l at 20°

C. and atmospheric pressure.

7. A method for producing a microcapsule dispersion according to any one of claims 1 to 6, wherein a water-in-oil emulsion comprising a hydrophobic diluent as continuous phase, and the hydrophilic capsule core material and the monomer composition is prepared and then the monomers are free-radically polymerized, the monomer composition comprisingto 95% by weight of one or more C₁-C₂₄-alkyl and/or glycidyl esters of acrylic acid and/or methacrylic acid

5 to 75% by weight of one or more hydrophilic monomers selected from acrylic acid esters and/or methacrylic acid esters which carry hydroxy and/or carboxy groups, and allylgiuconamide

0 to 40% by weight of one or more compounds having two or more ethylenically unsaturated radicals.

8. The method according to claim 7, wherein the water-in-oil emulsion is stabilized with a surface-active substance which is a linear block copolymer with a hydrophobic structural unit of a length of more than 50 Å

and which is defined by the general formula

C_w-(-B-A-B_y-)-xD_z

in which

w is 0 or 1,

x is 1 or more,

y is 0 or 1, and

z is 0 or 1

A is a hydrophilic structural unit which has a molar mass of from 200 to 50 000 with a solubility in water at 25°

C.>

1% by weight, and is selected such that it is covalently bonded to B, and

B is a hydrophobic structural unit which has a molar mass of from 300 to 60 000 and a solubility in water at 25°

C. of <

1% and can be covalently bonded to A, and

C and D are end groups which, independently of one another, can be A or B.

9. The method according to claim 8, wherein the water-in-oil emulsion is stabilized with a 12-hydroxystearic acid block copolymer as linear block copolymer.

10. The method according to claim 8, wherein the water-in-oil emulsion is stabilized with C₁₂-C₁₈-sorbitan fatty acid ester as surface-active substance.

12. The use of the microcapsule dispersion according to claims 1 to 6 comprising water or inorganic acids as auxiliary for modifying binding construction materials.

13. The use of the microcapsule dispersion according to claims 1 to 6 with a cosmetic active ingredient as core material as a constituent in cosmetic preparations.

14. The use of the microcapsule dispersion according to claims 1 to 6 with crop protection active ingredients as core materials as a constituent in agrochemical formulations.

11. A microcapsule comprising a hydrophilic capsule core and a capsule wall polymer which is obtainable by polymerization of a monomer composition comprisingto 95% by weight of one or more C₁-C₂₄-alkyl and/or glycidyl esters of acrylic acid and/or methacrylic acid

5 to 75% by weight of one or more hydrophilic monomers selected from acrylic acid esters and/or methacrylic acid esters which carry hydroxy and/or carboxy groups, and allylgiuconamide

0 to 40% by weight of one or more compounds having two or more ethylenically unsaturated radicals.