Clear coating compositions

Patent metadata

Field	Value
Publication number	US-12319840-B2
Application number	US-201816761984-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Nov 6, 2017
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

The present invention relates to a clear coating composition comprising a perlite, wherein the median particle size, d 50 , of the perlite is in the range of 0.5 and 25 μm, a method of making clear coating compositions and their use in coating an article or substrate.

First claim

The invention claimed is:

1. A clear coating composition comprising a thermoset polymer and a perlite, wherein:
the median particle size, d 50 , of the perlite is in the range of 17 μm and 25 μm as measured by sedimentation using a Sedigraph or as measured by laser diffraction;
the perlite has a BET surface area in the range of 1 m 2 /g to 8 m 2 /g;
the thermoset polymer comprises any one of: a self-crosslinking aliphatic copolymer dispersion based on a polyester, a polyurethane, a polyacrylate, and a urethane acrylate; and
the oil absorption of the perlite is in the range of 30 ml/100 g to 50 ml/100 g as measured in accordance NF EN ISO 787-5.

2. The clear coating composition according to claim 1 , wherein the perlite is an expanded perlite, an expanded milled perlite, a milled perlite or mixtures thereof.

3. The clear coating composition according to claim 1 , wherein the coating composition is a matt or semi-gloss composition having a gloss (60°)<70 according to ISO 2813.

4. The clear coating composition according to claim 1 , wherein the coating composition is a gloss composition having a gloss (60°)>80 according to ISO 2813.

5. The clear coating composition according to claim 1 , wherein the composition has a transparency level, ΔE* t , of less than 15, wherein ΔE* t is the ΔE* between a coating without filler and a coating with filler and wherein between 1 to 5 wt % of filler is employed.

6. The clear coating composition according to claim 1 , wherein the composition has a stain resistance, ΔE* sr , of less than 4, wherein ΔE* sr is the ΔE* between an unstained area and a stained area and wherein the stain resistance is determined according to ASTM D1308.

7. The clear coating composition according to claim 1 , wherein the perlite is present in an amount of 0.5 to 30% by weight based on the total weight of the clear coating composition.

8. The clear coating composition according to claim 1 , further comprising one or more of a polymer resin, a defoamer, a cross-linker, a dispersant, a coalescent agent, an adhesion promoter, a wetting agent, a rheological agent, a light stabiliser and/or a UV absorber.

9. The clear coating composition according to claim 8 , wherein the polymer resin is present in an amount between about 50 wt % to about 97 wt %, by weight based on the total weight of the clear coating composition.

10. A method of making the clear coating composition according to claim 1 comprising blending the perlite and other components of the clear coating composition.

11. An article or substrate coated with the clear coating composition according to claim 1 .

12. A method for coating an article or substrate, the method comprising coating said article or substrate with the clear coating composition according to claim 1 .

Assignees

• Imertech Sas

Inventors

• Patel Navin
• Newman Ben
• Fiolet Agnes
• Bertin Emmanuel
• Misuraca Jacob

Classifications

• C08L2201/54

  Aqueous solutions or dispersions · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08K2201/006

  Additives being defined by their surface area · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title