Polyurethane dispersions

• US 6,559,225 B1
• Filed: 02/27/2002
• Issued: 05/06/2003
• Est. Priority Date: 07/05/1999
• Status: Expired due to Term

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer AG
• Inventors: Ruf, Günther, Roschu, Rolf, Irle, Christoph, Kremer, Wolfgang
• Primary Examiner(s): GORR, RACHEL F
• Application Number:
  US10/030,029
• Time in Patent Office: 433 Days
• Field of Search: 524/839, 524/840, 428/423.1, 528/74.5
• US Class Current: 524/839
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/3231 Hydrazine or derivatives thereof
• CPC Class Codes: C08G 18/348 Hydroxycarboxylic acids
• CPC Class Codes: C08G 18/4018 Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
• CPC Class Codes: C08G 18/4288 modified by higher fatty oils or their acids or by resin acids
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

This invention relates to binders for aqueous coatings, to a process for the production thereof and to the use thereof for lacquers and coatings.

Claims

1. A polyurethane dispersion prepared from components comprising

A) 5-50% of a polyester prepared from,

AI) 30-85% of castor oil fatty acid,

AII) 10-60% of one or more carboxylic acids having 8 to 30 C atoms and 0 to 4 C═

C double bonds and

AIII) 3-20% of one or more alcohols with an average functionality of 2.5 to 3.5,

B) 5-60% of a polyisocyanate,

C) 0.5-40% of a polymeric polyol having a number-average molecular weight of 500 to 6000,

D) 0-10% of a monoalcohol and/or a monoamine,

E) 0.5-15% of a polyol, an aminopolyol and/or a polyamine having a molecular weight of below 500, and

F) 0-10% of an OH— and

/or NH-functional, nonionic, hydrophilic polyoxyalkylene ether,

wherein the percentages are by weight and add up to 100%.

2. The dispersion of claim 1 wherein component (A) is a polyester oligomer and component AIII) is glycerol.

3. The dispersion of claim 1 herein component (A) is prepared from

50-70% of AI),

25-35% of AII) and

5-15% of glycerol.

4. The dispersion of claim 1 wherein component (B) comprises 4,4′

-diisocyanatodicyclohexylmethane and/or isophorone diisocyanate.

5. The dispersion of claim 1 wherein component (C) comprises a polyether.

6. The dispersion of claim 1 wherein at least one compound of component (E) contains an ionic group or is capable of forming an ionic group.

7. A process for the production of the polyurethane dispersion of claim 1 comprising initially producing a polyester oligomer by transesterification from castor oil and one or more triglycerides, which have an iodine value of >

50, and dispersing this preliminary product.

8. A binder for coatings and adhesives comprising the polyurethane dispersion of claim 1.

9. A floor coated with the polyurethane dispersion of claim 1.