OXIDATIVELY DRYING POLYURETHANE DISPERSIONS WITH PARTICULARLY HIGH CHEMICAL RESISTANCE

• US 20170166685A1
• Filed: 12/06/2016
• Published: 06/15/2017
• Est. Priority Date: 12/10/2015
• Status: Active Grant

• Current Assignee: Covestro Deutschland AG
• Original Assignee: Covestro Deutschland AG
• Inventors: Ludewig, Michael, Nazaran, Pantea, Almato Guiteras, Maria, Tejada, Eva
• Granted Patent: US 10,640,604 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/244 tin salts of carboxylic acids
• CPC Class Codes: C08G 18/3212 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/3234 cycloaliphatic
• CPC Class Codes: C08G 18/348 Hydroxycarboxylic acids
• CPC Class Codes: C08G 18/36 Hydroxylated esters of higher fatty acids
• CPC Class Codes: C08G 18/675 Low-molecular-weight compounds
• CPC Class Codes: C08G 18/758 containing two or more cycloaliphatic rings
• CPC Class Codes: C09D 175/14 Polyurethanes having carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09F 9/00 Compounds to be used as driers, i.e. siccatives

Abstract

The present invention relates to hydrophilized polyurethanes having a particularly high content of hydroxy-functional, unsaturated triglycerides, to a process for preparing polyurethane dispersions based thereon, to the use of the dispersions as binders in oxidatively drying coating materials having particularly high chemical resistance, and to articles and substrates coated with these coating materials.

Claims

10. A polyurethane A) consisting of as synthesis components:

A1) 40 to 60 wt % of an oxidatively drying, OH-functional triglyceride,

A2) 30 to 55 wt % of 4,4′

-diisocyanato-dicyclohexylmethane,

A3) 3 to 15 wt % of one or more cycloaliphatic diols,

A4) 1 to 20 wt % of a compound having at least one isocyanate-reactive group and at least one ionic and/or potentially ionic function,

A5) 1 to 20 wt % of one or more mono-, di- or triamines having a molecular weight of less than 300 g/mol,

A6) 0 to 10 wt % of a neutralizing agent for converting a potentially ionic function, where present, of component A4) into an ionic function, and

A7) 0 to 5 wt % of a urethanization catalyst,

wherein the wt % is based on the total amount of all synthesis components, and the sum total of all the components does not exceed 100%.

12-1. g to the process of claim 12 and

B) optionally further aqueous binders,

C) one or more siccatives,

D) optionally solvents and/or water,

E) optionally auxiliaries and adjuvants.

13. A coating composition comprising at least one polyurethane dispersion made

14. The coating composition according to claim 13 wherein the composition is applied to a substrate selected from the group consisting of wood, wood-like substrates, cork and cellulose fibre-containing substrates.

15. A substrate coated with the coating compositions according to claim 13.