Coating composition comprising submicron calcium carbonate

Patent metadata

Field	Value
Publication number	US-10557012-B2
Application number	US-201113522768-A
Country	US
Kind code	B2
Filing date	Jan 25, 2011
Priority date	Jan 26, 2010
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

Coating composition providing gloss and opacity on application, having a pigment volume concentration of from 5% up to the critical pigment volume concentration and characterised in that comprises at least one ground natural calcium carbonate having a volume median diameter of between 0.05 and 0.3 μm, and at least one pigment having a refractive index of greater than or equal to 2.5.

First claim

The invention claimed is:

1. A glossing and opacifying coating composition comprising:
(i) at least one submicron ground natural calcium carbonate (SMGCC) having a volume median particle diameter d 50 of 0.05 to 0.3 μm and a d 98 of less than or equal to 0.6 μm, and titanium dioxide, wherein the titanium dioxide: SMGCC weight ratio in the composition is from 75:25 to 98:2, and wherein the calcium carbonate is calcite, marble, chalk or limestone; and
(ii) glossing and opacifying coating composition components,
wherein the glossing and opacifying coating composition has a pigment volume concentration (PVC) of from 5 vol.-% up to a critical pigment volume concentration (CPVC),

and wherein the glossing and opacifying coating composition, applied to a contrast card to form a layer having a thickness of 150 μm or 300 μm, has a gloss that is within ±3% of the gloss of the same composition and thickness in which the SMGCC is fully replaced with the titanium dioxide, when gloss is measured either at a 60° or an 85° incident angle according to DIN 67530.

2. The glossing and opacifying coating composition according to claim 1 , having a PVC of from 10 to 30 vol.-%.

3. The glossing and opacifying coating composition according to claim 1 , having a PVC of from 15 to 25 vol.-%.

4. The glossing and opacifying coating composition according to claim 1 , having a PVC of from 17 to 21 vol.-%.

5. The glossing and opacifying coating composition according to claim 1 , wherein the SMGCC has a volume median diameter d 50 of 0.08 to 0.3 μm.

6. The glossing and opacifying coating composition according to claim 1 , wherein the SMGCC has a volume median diameter d 50 of 0.1 to 0.2 μm.

7. The glossing and opacifying coating composition according to claim 1 , wherein the SMGCC has a d 98 /d 50 of greater than 3.

8. The glossing and opacifying coating composition according to claim 1 , wherein the SMGCC has a d 98 of less than or equal to 0.4 μm.

9. The glossing and opacifying coating composition according to claim 1 , wherein the titanium dioxide: SMGCC weight ratio is from 75:25 to 90:10.

10. The glossing and opacifying coating composition according to claim 1 , wherein the titanium dioxide: SMGCC weight ratio is from 80:20 to 85:15.

11. The glossing and opacifying coating composition according to claim 1 , which is paint.

12. The glossing and opacifying coating composition according to claim 1 , wherein the glossing and opacifying coating composition components comprise a resin, and the resin is a latex or an acrylate-based binder.

13. The glossing and opacifying coating composition according to claim 1 , further comprising one or more additives selected from the group consisting of defoamers, levelling agents, flatting agents, preservatives, optical brighteners, light stabilizers, thickeners, dispersents, solvents, water, coalescing solvents, plasticizers, anti-settling agents, dispersants, surfactants, rheology modifiers, biocides, metals, UV-absorbers, stabilizers, zinc oxide, nepheline syenite, diatomaceous earth, aluminium silicates, quartz, mica, wollastonite, colored inorganic pigments, colored organic pigments, and fillers.

14. The glossing and opacifying coating composition according to claim 1 , wherein the SMGCC is dispersed with one or more dispersants.

15. The glossing and opacifying coating composition according to claim 1 , having a Brookfield viscosity of from 200 to 500 mPas when measured at a rotation speed of 100 rpm at room temperature.

Assignees

• Gane Patrick A C
• Gysau Detlef
• Saunders George
• Mcjunkins Joseph
• Omya Int Ag

Inventors

• Gane Patrick A C
• Gysau Detlef
• Saunders George
• Mcjunkins Joseph

Classifications

• C08K3/26

  Carbonates; Bicarbonates · CPC title

• Y10T428/258

  Alkali metal or alkaline earth metal or compound thereof · CPC title

• C09C1/00 Primary

  Treatment of specific inorganic materials other than fibrous fillers (tenebrescent materials C09K9/00; luminescent materials C09K11/00); Preparation of carbon black · CPC title

• C09D7/68

  Particle size between 100-1000 nm · CPC title

• C09D127/06

  Homopolymers or copolymers of vinyl chloride · CPC title