Method for the application of a polymer coating to a metal surface and polymer powder suitable for the method

• US 4,307,133 A
• Filed: 06/09/1980
• Issued: 12/22/1981
• Est. Priority Date: 06/29/1979
• Status: Expired due to Term

• Current Assignee: Stamicarbon B.V. (MAIRE)
• Original Assignee: Stamicarbon B.V. (MAIRE)
• Inventors: Haselier, Frans J. J.
• Primary Examiner(s): BECK, SHRIVE
• Application Number:
  US06/157,839
• Time in Patent Office: 561 Days
• Field of Search: 260/45.85 B, 260/45.95 B, 260/45.85 S, 260/525, 428/462, 427/195, 427/201
• US Class Current: 427/195
• CPC Class Codes: C08K 5/005 Stabilisers against oxidation, heat, light, ozone
• CPC Class Codes: C08L 23/06 Polyethene
• 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 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09D 123/06 Polyethene
• CPC Class Codes: Y10T 428/31696 Including polyene monomers [e.g., butadiene, etc.]

Abstract

Compositions of polyolefins having from 0.5 to 80% by weight of unstabilized polyethylene powder and from 20% to 99.5% by weight of a stabilized polyolefin powder. These powdered compositions have superior adhesion to metallic objects and can be applied directly to heated metallic objects to provide the protective coating.

Claims

1. In a method for the application of a polymer coating to a metal surface, wherein a powder of at least one polyolefin is applied to a heated metal surface to form such coating, the improvement consisting essentially in employing a polymer powder mixture consisting essentially of from 0.5 to 80% by weight of unstabilized polyethylene powder and 20 to 99.5% by weight of a stabilized polyolefin powder.

2. The method according to claim 1, wherein said polyolefin is polyethylene.

3. The method according to either claim 1 or 2, wherein said polyethylene has a density of between 905 and 940 kg/m³.

4. The method according to claim 2, wherein the stabilized powder contains from 0.01 to 5.0% by weight of stabilizer.

5. The method according to claims 1, 2 or 4, wherein from 1 to 30% by weight of unstabilized polyethylene powder and from 70 to 99% by weight of stabilized polyolefin powder are used.

6. The method according to claims 1, 2, or 4, wherein the powder used has an average particle size (d₅₀) of between 0.1 and 0.5 mm.

7. A polymer powder consisting of from 0.5 to 80% by weight of unstabilized polyethylene powder and from 20 to 99.5% by weight of stabilized polyolefin powder.