Stain Blocking Water Borne Coating Composition

• US 20070213445A1
• Filed: 01/21/2005
• Published: 09/13/2007
• Est. Priority Date: 01/22/2004
• Status: Abandoned Application

• Current Assignee: Nuplex Resins B.V. (Allnex (Luxembourg) & Cy SCA)
• Original Assignee: Nuplex Resins B.V. (Allnex (Luxembourg) & Cy SCA)
• Inventors: Mestach, Dirk, Klijn, Teunis, Twene, Derrick
• Application Number:
  US10/586,994
• Publication Number:
  US 20070213445A1
• Time in Patent Office: Days
• US Class Current: 524/445
• CPC Class Codes: C08K 3/20 Oxides; Hydroxides graphene oxides C08K3/042
• CPC Class Codes: C08K 3/346 Clay
• CPC Class Codes: C09D 5/028 Pigments; Filters
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31989 Of wood

Abstract

The invention relates to a stain blocking water borne coating composition, preferably for clear coats, comprising an organic binder and as stain blocking agent at least one type of inorganic nano-particles having a layered structure and a crystal structure with positively charged layers. Further, the invention relates to a method for coating a substrate comprising water extractable staining agents wherein the substrate is coated with an organic water borne coating composition comprising as stain blocking agent at least one type of inorganic nano-particles preferably having a layered structure and a crystal structure with positively charged layers and to coated substrates obtainable by this method

Claims

1. A stain blocking water borne coating composition comprising an organic binder and as stain blocking agent at least one type of inorganic nano-particles having a layered structure and a crystal structure with positively charged layers.

2. The stain blocking water borne coating composition according to claim 1, wherein the nano-particles are anionic clays or layered double hydroxide (LDH) salts.

3. The stain blocking water borne coating composition according to claim 2, wherein the layered double hydroxide (LDH) is selected from the group consisting of hydrotalcite, stichtite, pyroaurite, desautelsite.

4. The stain blocking water borne coating composition according to claim 1, comprising one or more water borne organic polymeric binders selected from the group consisting of acrylic and styrene-acrylic dispersions, vinyl acetate copolymer dispersions, alkyd emulsions, polyurethane dispersions, water borne hybrids between urethane and acrylic polymeric dispersions, and UV-curable water borne polymer dispersions.

5. The stain blocking water borne coating composition according to claim 1, further comprising one or more components selected from the group consisting of emulsifiers, pigments, fillers, dispersants, coalescing agents, curing agents, thickeners, humectants, wetting agents, biocides, plasticisers, antifoaming agents, colourants, waxes, and antioxidants.

6. The stain blocking water borne coating composition according to claim 1, which composition is a clear coat composition.

7. The stain blocking water borne coating composition according to claim 1, further comprising at least 0.3 wt percent of a dispersing agent.

8. The stain blocking water borne coating composition according to claim 1, wherein the total amount of inorganic nano-particles is 0.140% by weight, based on the total weight of the water borne coating composition, and wherein the total amount of organic binder is 4-80% by weight, based on the total weight of the water borne coating composition.

12. The method according to claim 10, wherein substrate is coated with the stain blocking water borne coating composition according to claim 1.

19. The stain blocking water borne coating composition according to claim 3, wherein the layered double hydroxide (LDH) is optionally modified with one or more dispersing agents.

9. (canceled)

10. A method for coating a substrate comprising water extractable staining agents wherein the substrate is coated with an organic water borne coating composition comprising at least one type of inorganic nano-particles as stain blocking agent.

11. The method according to claim 10, wherein the inorganic nano-particles comprise anionic clays, cationic clays and/or layered hydroxy salts (LHS).

13. A coated substrate comprising water extractable staining agents obtainable by the method according to claim 10.

14. The coated substrate according to claim 13, wherein the substrate is selected from the group consisting of a wooden, cementitous, metal, mineral and synthetic substrate, substrate made from processed wood, painted wood or primed wood.

20. The coated substrate according to claim 14, wherein said substrate is a tannin-containing wooden substrate.

15. Use of one or more types of inorganic nano-particles as stain blocking agent in an organic water borne coating composition.

16. Use according to claim 15, wherein the inorganic nano-particles comprise anionic clays, cationic clays and/or layered hydroxy salts (LHS).

17. Use according to claim 16, wherein the inorganic nano-particles comprise a layered double hydroxide (LDH).

18. Use according to claim 17, wherein the layered double hydroxide (LDH) is selected from the group consisting of hydrotalcite, stichtite, pyroaurite, desautelsite, and sergeevite.

21. The stain blocking water borne coating composition according to claim 18, wherein the layered double hydroxide (LDH) is optionally modified with one or more dispersing agents.