Waterborne coating compositions and heat sensitive substrates coated therewith

Patent metadata

Field	Value
Publication number	US-9598597-B2
Application number	US-201514953518-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Mar 14, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention is directed to a coated substrate comprising:
A) a heat sensitive substrate having a heat distortion temperature less than 120 degrees C., and B) a coating layer deposited on at least one surface of the substrate, wherein the coating layer is deposited from a waterborne coating composition comprising:
(a) a continuous phase comprising water, and (b) a dispersed phase comprising:
(i) optional pigments; (ii) polymeric particles containing carboxylic acid functionality prepared from the polymerization of a mixture of ethylenically unsaturated compounds including ethylenically unsaturated monomers; and (iii) a polycarbodiimide or a polyhydrazide. The present invention is further directed to the waterborne coating compositions used to prepare the coated substrates.

First claim

What is claimed is:

1. A waterborne coating composition comprising:
(a) a continuous phase comprising water, and
(b) a dispersed phase comprising:
(i) pigments;
(ii) polymeric particles prepared from the polymerization of a mixture of ethylenically unsaturated compounds including an ethylenically unsaturated polyurethane and ethylenically unsaturated monomers comprising:
(A) 2 to 30 percent by weight of a multi-ethylenically unsaturated monomer and
(B) at least 30 percent by weight of an aldo or keto group-containing ethylenically unsaturated monomer,
the percentages by weight being based on total weight of the ethylenically unsaturated monomers; and

(iii) a polyhydrazide.

2. The composition of claim 1 in which the ethylenically unsaturated polyurethane is prepared by reacting a polyisocyanate with a polyol containing carboxylic acid functionality and a hydroxyl group-containing ethylenically unsaturated monomer.

3. The composition of claim 2 in which the ethylenically unsaturated polyurethane makes up 30 to 60 percent by weight of the mixture of ethylenically unsaturated compounds and the ethylenically unsaturated monomers make up 40 to 70 percent by weight of the mixture of ethylenically unsaturated compounds; the percentages by weight being based on total weight of the ethylenically unsaturated compounds.

4. The composition of claim 1 in which the polyhydrazide comprises at least one of maleic dihydrazide, fumaric dihydrazide, itaconic dihydrazide, phthalic dihydrazide, isophthalic dihydrazide, terephthalic dihydrazide, trimellitic trihydrazide, oxalic dihydrazide, adipic dihydrazide and sebacic dihydrazide.

5. The composition of claim 1 in which the ethylenically unsaturated monomers comprise from 4 to 40 percent by weight of an alkyl ester of (meth)acrylic acid having at least 6 carbon atoms in the alkyl group; the percentages by weight being based on total weight of the ethylenically unsaturated monomers.

6. The composition of claim 5 wherein upon application of the composition to a substrate as a coating and after curing by reaction of the polyhydrazide with the keto or aldo groups, the composition demonstrates a T g less than 25° C.

7. The composition of claim 1 in which the polymeric particles contain amine salt groups.

8. The composition of claim 1 in which the equivalent ratio of hydrazide groups in the polyhydrazide to aldo or keto groups is from 0.5 to 1.5:1.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Chasser Anthony M
• Sadvary Richard J
• Swarup Shanti
• Xu Xiangling

Classifications

• C09D5/02 Primary

  Emulsion paints {including aerosols} · CPC title

• C09D133/14 Primary

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• Y10T428/31551

  Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] · CPC title

• C09D147/00

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Coating compositions based on derivatives of such polymers (C09D145/00 takes precedence; based on conjugated diene rubbers C09D109/00 - C09D121/00) · CPC title

• Y10T428/31511

  Of epoxy ether · CPC title