Anti-skid coating composition

• US 5,110,657 A
• Filed: 05/22/1990
• Issued: 05/05/1992
• Est. Priority Date: 05/22/1990
• Status: Expired due to Fees

• Current Assignee: Neste Resins Canada
• Original Assignee: Reichhold Chemicals Incorporated (Reichhold Liquidation, Inc.)
• Inventors: Ainslie, Winston C.
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Watkins, III, William P.
• Application Number:
  US07/526,976
• Time in Patent Office: 714 Days
• Field of Search: 428/141, 428/144, 428/146, 428/147, 428/528, 428/511, 428/220, 428/219, 428/341, 428/326, 428/327, 428/323, 428/314, 427/202, 427/186, 427/195, 524/49, 524/503, 524/15, 525/163
• US Class Current: 428/141
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 7/08 using synthetic lacquers or varnishes
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 131/04 Homopolymers or copolymers of vinyl acetate
• CPC Class Codes: C09D 161/24 with urea or thiourea
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/2438 Coated
• CPC Class Codes: Y10T 428/24397 Carbohydrate
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• 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 428/253 Cellulosic [e.g., wood, paper, cork, rayon, etc.]
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/31895 Paper or wood
• CPC Class Codes: Y10T 428/31906 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31957 Wood

Abstract

An anti-skid coating composition for coating various substrates including structural panel board surfaces, comprises a binder made of urea formaldehyde resin, polyvinyl acetate, ammonium chloride and a dispersant. The binder is used in conjunction with an aggregate, such as walnut shells. A method is also provided for coating the substrates to impart slip resistance thereto.

Claims

1. A weather-resistant temporary anti-skid coating consisting essentially of:

(a) a binder composition having a viscosity of about 300 to 1200 centipoises comprising;

(i) about 85 to 95 weight % of an aqueous resin selected from the group consisting of urea-formaldehyde resin, melamine formaldehyde resin, and mixtures thereof;

(ii) about 3 to 20 weight % of an aqueous emulsion selected from the group consisting of polyvinyl acetate, ethylene-vinyl acetate copolymer and mixtures thereof;

(iii) a catalyst comprising a salt selected from the group consisting of ammonium chloride, ammonium sulfate and mixtures thereof;

(iv) a dispersant for said catalyst; and

(b) an aggregate that does not dull cutting blades having a particle size of about 20 to 60 mesh;

wherein the coating is sufficiently viscous to substantially prevent its penetration into a wooden substrate and wherein said coating has a cure time of about 1/2 to 11/2 minutes at about 350°

F.

2. The coating of claim 1, wherein the alt catalyst is about 0.25 to 3.0 weight % of the binder composition.

3. The coating of claim 1, wherein the aggregate material is selected from the group consisting of walnut shell aggregate, rubber chips, waste plastic aggregate, and mixtures thereof.

4. The coating of claim 1, wherein the urea formaldehyde resin has a boiling water reactivity of about 25 to 90 seconds.

5. The coating of claim 1, wherein the salt catalyst contains a dispersant varying from about 15 to 60% by weight of the ammonium chloride catalyst.

6. The coating of claim 5, wherein the dispersant is selected from the group consisting of alnut shell powder, pecan shell powder, bark powder, furafil powder, wood powder, wheat powder, and mixtures thereof.

7. The coating of claim 1, wherein the anti-skid binder composition is used in conjunction with a panel board substrate.

8. A weather-resistant laminate having a temporary anti-skid coating consisting essentially of a substrate, a first coating of a binder composition in contact with the substrate comprising:

(a) about 85 to 95 weight % of an aqueous resin selected from the group consisting of urea-formaldehyde resin, melamine formaldehyde resin, and mixtures thereof;

(b) about 3 to 20 weight % of an aqueous emulsion selected from the group consisting of polyvinyl acetate, ethylene-vinyl acetate copolymer and mixtures thereof;

(c) a catalyst comprising a salt selected from the group consisting of ammonium chloride, ammonium sulfate and mixtures thereof;

(d) a dispersant for said catalyst; and

an intermediate aggregate layer with an aggregate that does not dull cutting blades having a particle size of about 20 to 60 mesh in contact with the first binder coating; and

a second top coating of the aforesaid binder composition in contact with the aggregate coating;

wherein the binder composition has a viscosity of about 300 to 1200 centipoise, and is sufficiently viscous to substantially prevent its penetration into a wooden substrate, and wherein said composition has a cure time of about 1/2 to 11/2 minutes at about 350°

F.

9. The laminate of claim 8, wherein the aggregate material is selected from the group consisting of walnut shell aggregate, rubber chips, waste plastic aggregate, and mixtures thereof.

10. The laminate of claim 8, wherein the substrate is panel board.

11. A method of imparting improved weather-resistant temporary slip resistance to a substrate, consisting essentially of:

(a) contacting a first coating of an anti-skid binder composition to the substrate surface;

(b) contacting an aggregate that does not dull cutting blades to the first coating;

(c) contacting a second coating of said binder composition to the aggregate;

wherein said binding composition comprises;

(i) about an 85 to 95 weight % of an aqueous resin selected from the group consisting of urea-formaldehyde resin, melamine formaldehyde resin, and mixtures thereof;

(ii) about 3 to 20 weight % of an aqueous emulsion selected from the group consisting of polyvinyl acetate, ethylene-vinyl acetate copolymer, and mixtures thereof;

(iii) a catalyst comprising a salt selected from the group consisting of ammonium chloride, ammonium sulfate, and mixtures thereof;

(iv) a dispersant for said catalyst; and

wherein the binder composition has a viscosity of about 300 to 1200 centipoise and is made sufficiently viscous to substantially prevent its penetration into a wooden substrate and wherein said composition cures in about 1/2 to 11/2 minutes at about 350°

F.

12. The method of claim 11, wherein the binder composition is contacted to the substrate at a rate of about 95 to 120 grams per square meter of surface.

13. The method of claim 11, wherein the aggregate is contacted to the substrate at a rate of about 30 to 55 grams per square meter of surface.