A Coating System

• US 20160168412A1
• Filed: 07/15/2014
• Published: 06/16/2016
• Est. Priority Date: 07/22/2013
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Caillouette, Lyle A., Praw, Michael L., JANOS, Jeffrey R., Haynes, Stacey E.
• Granted Patent: US 10,808,140 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 18/36 Hydroxylated esters of higher fatty acids
• CPC Class Codes: C08G 18/6229 Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
• CPC Class Codes: C08G 18/6547 the low-molecular compounds being compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C09D 125/14 with unsaturated esters
• CPC Class Codes: C09D 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: E01C 23/166 Means for dispensing particulate material on to freshly applied markings or into the marking material after discharge thereof, e.g. reflective beads, grip-improving particles
• CPC Class Codes: E01C 7/085 Aggregate or filler materials therefor; Coloured reflecting or luminescent additives therefor thin surface layers or surface dressings E01C7/35
• CPC Class Codes: E01C 7/30 of road-metal and other binders, e.g. synthetic material , i.e. resin

Abstract

A coating, system comprises 30 to 90 parts by weight of a bioresin component and 10 to 70 parts by weight of an isocyanate component, based on 100 parts by weight of the coating system, and has a percent solids of greater than 60%. The bioresin component comprises an acrylic polymer and a biopolyol formed from a natural oil. A method of forming a coating on a substrate with the coating system comprises the steps of combining the bioresin component and the isocyanate component to form a reaction mixture having a percent solids of greater than 60 percent, applying the reaction mixture onto the substrate, and curing the reaction mixture to form the coating on the substrate.

Claims

1. A coating system comprising:

(A) 30 to 90 parts by weight of a bioresin component, based on 100 parts by weight of the coating system, said bioresin component comprising;

an acrylic polymer, and

(ii) a biopolyol formed from a natural oil; and

(B) 10 to 70 parts by weight of an isocyanate component, based on 100 parts by weight of the coating system, said isocyanate component reactive with said bioresin component;

wherein said coating system has a percent solids of greater than 85 percent.

2. A coating system as set forth in claim 1 wherein said natural oil is selected from the group of canola oil, castor oil, coconut oil, cottonseed oil, olive oil, palm oil, peanut oil, rapeseed oil, soybean oil, and combinations thereof.

3. A coating set forth in claim 1 wherein said natural oil comprises coconut oil.

4. A coating system as set forth in claim 1 wherein said biopolyol has a hydroxyl number of from 150 to 350 mg KOH/g and/or a viscosity of from 100 to 5,000 mPa·

s at 20°

C.

5. A coating system as set forth in claim 1 wherein said acrylic polymer comprises from 5 to 50 percent by weight 2-ethylhexyl acrylate units, from 5 to 50 percent by weight hydroxyethyl methacrylate units, and/or from 5 to 50 percent by weight styrene units.

6. A coating system as set forth in claim 1 wherein said acrylic polymer has a hydroxyl number of from 50 to 250 mg KOH/g and/or a viscosity of from 500 to 10,000 mPa·

s at 25°

C.

7. A coating system as set forth in claim 1 wherein said isocyanate component has an NCO content of from 15 to 35 weight percent.

8. A coating system as set forth in claim 1 wherein said isocyanate component has a viscosity at 23°

C. of from 100 to 5,000 mPa·

s.

9. A coating system as set forth in claim 1 wherein said isocyanate component comprises isocyanurated HDI.

10. A coating system as set forth in claim 1 wherein said isocyanate component comprises HDI isocyanural.

11. A coating comprising the reaction product of the coating system of claim 1.

12. A coating as set forth in claim 11 having a thickness of from 0.5 to 10 mil.

13. A coating as set forth in claim 11 having a Δ

a of from −

2 to 0 and a Δ

b of from 0.0 to 0.50 when tested for 254 hours in accordance with SAE J-2527.

14. A coating as set forth in claim 11 having a Taber abrasion resistance of less than 60 mg when tested in accordance with ASTM D4060 (1000 cycles, CS-17 mg wheel, weight 1000 grams).

15. A method of forming a coating on a substrate with a coating system comprising a bioresin component including an acrylic polymer and a biopolyol formed from a natural oil, and also comprising an isocyanate component reactive with the bioresin component, said method comprising the steps of:

(A) combining 30 to 90 parts by weight of the bioresin component and 10 to 70 parts by weight of the isocyanate component to form a reaction mixture having a percent solids of greater than 85 percent;

(B) applying the reaction mixture onto the substrate; and

(C) curing the reaction mixture to form the coating on the substrate.

16. A method as set forth in claim 15 wherein bioresin component and the isocyanate component are combined at an isocyanate index of from 90 to 120.

17. A method as set forth in claim 15 wherein the reaction mixture has a pot life of greater than 10 minutes when tested in accordance with ASTM D 2196-05, at 74°

F. and 20% RH.

18. A method as set forth in claim 15 wherein the reaction mixture has a set to touch time of equal to or less than 340 minutes, when tested in accordance with ASTM D5895-13 at 74°

F. and 20% RH and/or a tack free time of equal to or less than 370 minutes, when tested in accordance with ASTM D5895-13 at 74°

F. and 20% RH.

19. A method as set forth in claim 15 wherein the substrate comprises particulate matter bound together with a polymeric binder.

20. A method as set forth in claim 19 wherein the substrate is further defined as a pavement comprising glass and/or stone particles bound together with a polyurethane binder.