Polyurethane coating composition

Patent metadata

Field	Value
Publication number	US-9487672-B2
Application number	US-201414464217-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Sep 18, 2009
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A polymer useful in coating compositions is described. The polymer is preferably an unsaturated polyurethane polymer, which preferably has an iodine value of at least 10. The polymer may be combined with one or more liquid carriers to form a liquid coating composition useful in coating a variety of substrates, including planar metal substrates.

First claim

What is claimed is:

1. A method of coil coating comprising:
providing a coating composition comprising:
about 30% by weight of an unsaturated polyurethane polymer having an iodine value of at least 10 and no more than 200 and including about 1% to about 6% by weight of ether oxygen, based on the total solids of the coating composition; and
a liquid carrier including an amount of one or more organic solvents that constitutes at least 15% by weight of the coating composition;

applying the coating composition to at least a portion of a planar metal substrate; and
heating the coated metal substrate to a peak metal temperature of at least 177° C. to form a crosslinked coating.

2. The method of claim 1 , wherein the unsaturated polyurethane polymer is a self-crosslinkable polymer.

3. The method of claim 1 , wherein the polyurethane polymer includes one or more aliphatic carbon-carbon double bonds that comprise a vinylic double bond, a conjugated double bond, a double bond present in a strained ring group, a double bond present in an unsaturated bicyclic group, or a combination thereof.

4. The method of claim 1 , wherein the unsaturated polyurethane polymer includes one or more segments formed from an unsaturated polybutadiene compound.

5. The method of claim 4 , wherein the unsaturated polyurethane polymer is formed from ingredients including, based on nonvolatile content, at least 5% by weight of the polybutadiene compound.

6. The method of claim 1 , wherein the unsaturated polyurethane polymer includes about 3.0 to 4.5% by weight of ether oxygen.

7. The method of claim 1 , wherein the unsaturated polyurethane polymer includes one or more structural units derived from diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, dibutylene glycol, tributylene glycol, tetrabutylene glycol, a polyethylene glycol, a polypropylene glycol, a polybutylene glycol, or a combination thereof.

8. The method of claim 1 , wherein the coating composition further comprises one or more metal driers.

9. The method of claim 1 , wherein the coating composition comprises an aqueous dispersion of the polyurethane polymer.

10. The method of claim 1 , wherein the liquid carrier includes an amount of water that constitutes at least 10% by weight of the coating composition.

11. The method of claim 1 , wherein the coating composition comprises:
from 25 to 50% by weight of solids;
from 25 to 50% by weight of one or more organic solvents; and
from 25 to 50% by weight of water.

12. The method of claim 1 , wherein the coating composition further comprises a vinyl polymer.

13. The method of claim 1 , wherein the coated metal substrate is heated for 5 to 900 seconds to a peak metal temperature of at least 218° C. to form the crosslinked coating composition.

14. The method of claim 1 , further comprising forming the coated planar metal substrate, having the crosslinked coating disposed thereon, into an article.

15. An article prepared according to the method of claim 1 .

Assignees

• Valspar Sourcing Inc

Inventors

• Cavallin Carl
• Killilea T Howard
• Brandenburger Larry
• Hartinger Dan

Classifications

• B32B15/08

  of synthetic resin · CPC title

• C07C37/20

  using aldehydes or ketones · CPC title

• C09D175/14 Primary

  Polyurethanes having carbon-to-carbon unsaturated bonds · CPC title

• C09D167/06

  Unsaturated polyesters having carbon-to-carbon unsaturation · CPC title

• Y10T428/31692

  Next to addition polymer from unsaturated monomers · CPC title