IP Library › Granted Patent US 10,767,076
Granted Patent B2
US 10,767,076 · App. 16/412,005 · Granted Sep 8, 2020

Water-reducible coating composition

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Quick Facts
Patent No.
US 10,767,076
App. No.
16/412,005
Granted
Sep 8, 2020
Kind
B2
Abstract

The present description provides a water-reducible or water-dispersible coating system that can be used to form a durable, corrosion-resistant protective coating on a wide range of substrates. The coating system includes an alkyd resin prepared from a polyester feedstock that includes post-consumer recycled PET and a waste cooking oil feedstock. Methods for preparing the coating system and articles coated with the coating system are also described.

Claims (20)

1. A coated article, comprising;

at least a portion of an exposed surface of a metal substrate; and

a coating system applied to at least the exposed surface, wherein the coating system comprises:

a water-reducible alkyd resin comprising the reaction product of

about 65 to 75 wt % of a polyester feedstock comprising

about 20 to 80% by weight of polyethylene terephthalate;

about 1 to 10% by weight of a hydroxyl-functional compound; and

about 1 to 20% by weight of a carboxyl-functional compound, based on the total weight of the polyester feedstock; and

about 25 to 35 wt % of a waste cooking oil feedstock comprising yellow grease, brown grease, or mixtures thereof.

2. The article of claim 1 , wherein the polyethylene terephthalate is derived from post-consumer waste material.

3. The article of claim 1 , wherein the hydroxy-functional compound is selected from ethylene glycol, diethylene glycol, triethylene glycol, cyclohexanedimethanol, propylene glycol, 1,2-propylene glycol, 1,3-propane diol, 1,2-butylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, glycerol, trimethylolpropane, trimethylolethane, pentaerythritol, erythritol, derivatives thereof, or combinations thereof.

4. The article of claim 1 , wherein the carboxyl-functional compound is selected from trimellitic acid, trimellitic anhydride, maleic acid, maleic anhydride, fumaric acid, isophthalic acid, and combinations thereof.

5. The article of claim 1 , wherein the hydroxy-functional compound is pentaerythritol.

6. The article of claim 1 , wherein the carboxyl-functional compound is trimellitic acid.

7. The article of claim 1 , wherein the metal substrate comprises at least a part of an underbody of a transportation vehicle or storage unit.

8. The article of claim 1 , wherein the metal substrate comprises at least a portion of an underbody of an intermodal shipping container.

9. The article of claim 1 , wherein the metal substrate is an intermodal shipping container.

10. The article of claim 1 , wherein the polyester feedstock further includes about 1 to 10 wt % linseed oil.

11. The article of claim 1 , wherein the alkyd resin composition has an acid number of about 40 to about 70.

12. The article of claim 1 , wherein the alkyd resin composition has a molecular weight (Mn) of 1000 to 10,000.