Acrylic polyurethane coatings including polyether polyols

Patent metadata

Field	Value
Publication number	US-10626293-B2
Application number	US-201616061872-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	Dec 17, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

An acrylic polyurethane coating composition, comprising an isocyanate component comprising at least one polyisocyanate trimer; and an isocyanate reacting mixture, the isocyanate reacting mixture comprising from 25 wt % to 80 wt % of an acrylic polyol and from 1 wt % to 30 wt % of a polyether polyol, based on a total weight of the acrylic polyurethane coating composition, the acrylic polyol having a solids content of at least 50 wt %, based on a total weight of the acrylic polyol, and the polyether polyol having a viscosity of less than 500 mPa*s at 25° C. and a number average molecular weight greater than 300 and less than 700.

First claim

The invention claimed is:

1. An acrylic polyurethane coating composition, comprising:
an isocyanate component comprising at least one aliphatic polyisocyanate trimer or biuret; and
an isocyanate reacting mixture, the isocyanate reacting mixture comprising from 25 wt % to 80 wt % of an acrylic polyol and from 1 wt % to 30 wt % of a polyether polyol, based on a total weight of the acrylic polyurethane coating composition, the acrylic polyol having a solids content of at least 50 wt %, based on a total weight of the acrylic polyurethane coating composition, and wherein the polyether polyol is a triol having a hydroxyl number from 250 mg KOH/g to 450 mg KOH/g, a viscosity of less than 500 mPa*s at 25° C. and a number average molecular weight greater than 300 and less than 700.

2. The acrylic polyurethane coating composition according to claim 1 , wherein the acrylic polyol has a hydroxyl equivalent weight, on a solids basis, of from 350 to 550 g/mol equivalence.

3. The acrylic polyurethane coating composition according to claim 1 , further comprising an organic solvent in an amount less than 22 wt %, based on the total weight of the isocyanate reacting mixture.

4. The acrylic polyurethane coating composition according to claim 1 , wherein the polyether polyol is a polyoxybutylene polyol.

5. The acrylic polyurethane coating composition according to claim 1 , wherein the polyether polyol is a polyoxypropylene polyol.

6. The acrylic polyurethane coating composition according to claim 1 , wherein the isocyanate reacting mixture further includes a carboxylic acid source and has an acid number value of 2.5 mg KOH/g to 8.0 mg KOH/g.

7. The acrylic polyurethane coating composition according to claim 1 , wherein a ratio of the acrylic polyol to the polyether polyol is from 5 to 15.

8. The acrylic polyurethane coating composition according to claim 1 , wherein:
the isocyanate component is present in an amount of from 15% to 40% by weight based on the polyurethane coating composition and the isocyanate reacting mixture is present in an amount of from 25% to 60% by weight based on the polyurethane coating composition, and
the polyurethane coating composition has a solids content of greater than 50%.

9. A method of forming an acrylic polyurethane coating from the acrylic polyurethane coating composition according to claim 1 , comprising allowing the isocyanate component and the isocyanate reacting mixture to mix.

Assignees

• Dow Global Technologies Llc

Inventors

• Letko Christopher S
• Stephenson Amber Marie
• Argyropoulos John N
• Klier John

Classifications

• C09D175/08 Primary

  from polyethers · CPC title

• C08G18/6229

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title

• C08G18/792

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C08G18/4063

  Mixtures of compounds of group C08G18/62 with other macromolecular compounds · CPC title

• C08G18/4829 Primary

  Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title