Process for producing an extrusion-coated metal article

• US 6,500,554 B2
• Filed: 03/05/2001
• Issued: 12/31/2002
• Est. Priority Date: 03/04/2000
• Status: Expired due to Fees

• Current Assignee: Degussa AG (Rag-Stiftung)
• Original Assignee: Degussa AG (Rag-Stiftung)
• Inventors: Hellermann, Walter, Gahlmann, Klaus
• Primary Examiner(s): Dawson, Robert
• Assistant Examiner(s): Robertson, Jeffrey B.
• Application Number:
  US09/797,950
• Publication Number:
  US 20010023537A1
• Time in Patent Office: 666 Days
• Field of Search: 428/450, 428/447, 428/448, 428/451, 428/35.8, 428/35.9, 428/36.9, 428/36.91, 427/327, 427/387, 427/366.1, 138/DIG.4, 138/140, 138/141, 138/142, 138/145
• US Class Current: 428/450
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08G 77/26 nitrogen-containing groups
• CPC Class Codes: C08G 77/28 sulfur-containing groups
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: Y10S 138/04 Air conditioning
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49622 Vehicular structural member making
• CPC Class Codes: Y10T 428/12292 Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]
• CPC Class Codes: Y10T 428/1355 Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
• CPC Class Codes: Y10T 428/1359 Three or more layers [continuous layer]
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product

Abstract

An extrusion-coated metal article is prepared by applying a mixture which comprises an organosilane composition to a metal surface, and then extruding a melt of a polyamide molding composition onto the coated surface thus treated and dried.

Claims

1. An extrusion-coated metal profile prepared by a process comprising:

1) applying to a surface of a metal a mixture which comprises an organosilane composition which is prepared from

a) Q mols. of alkoxysilanes which have a functional group and have the formula;

2. The extrusion-coated metal profile as claimed in claim 1, wherein the profile is a tube.

3. The extrusion-coated metal profile as claimed in claim 2, wherein the profile is a component of an automobile.

4. The extrusion-coated metal profile as claimed in claim 3, wherein the profile is a fuel line, a servo control line, a water-cooling line, a brake line or a line in an air-conditioning system.

5. The extrusion-coated metal profile as claimed in claim 1, wherein the metal surface is aluminum, an aluminum alloy, chromatized aluminum, steel, brass or zinc.

6. The extrusion-coated metal profile as claimed in claim 1, wherein the polyamide molding composition has a theoretical excess of amino end groups.

7. The extrusion-coated metal profile as claimed in claim 1, wherein the polyamide molding composition comprises from 0.05 to 10% by weight of additives selected from the group consisting of

oxazolines,

bisoxazolines,

polyoxazolines which are prepared by cationic ring-opening polymerization of oxazolines,

bifunctional epoxides or epoxy resins having an epoxy functionality of at least 2, and

adhesive resins based on acetophenone-formaldehyde resins or on cyclohexanone-formaldehyde resins.

8. The extrusion-coated metal profile as claimed in claim 1, wherein from the moment of melt application of the polyamide, the profile has been held for not more than 30 seconds at a temperature above T_m in the case of a crystalline molding composition and above T_g+30°

C. in the case of an amorphous molding composition.

9. The extrusion-coated metal profile as claimed in claim 1, wherein at least one other polymer layer is applied to the polyamide layer.

22. A method of automobile construction where parts with coated metal surfaces are required, comprising:

employing in said automobile construction metal parts which are extrusion-coated metal profiles of claim 1.

23. A method of mechanical engineering in which coated metal surfaces are required, comprising:

employing in said mechanical engineering process parts which are extrusion-coated metal profiles of claim 1.

24. The extrusion-coated metal profile as claimed in claim 1, wherein A is amino.

25. The extrusion-coated metal profile as claimed in claim 1, wherein A is alkylamino.

26. The extrusion-coated metal profile as claimed in claim 1, wherein A is dialkylamino.

27. The extrusion-coated metal profile as claimed in claim 1, wherein A is amido.

28. The extrusion-coated metal profile as claimed in claim 1, wherein A is epoxy.

29. The extrusion-coated metal profile as claimed in claim 1, wherein A is acryloxy.

30. The extrusion-coated metal profile as claimed in claim 1, wherein A is methacryloxy.

31. The extrusion-coated metal profile as claimed in claim 1, wherein A is cyano.

32. The extrusion-coated metal profile as claimed in claim 1, wherein A is isocyanato.

33. The extrusion-coated metal profile as claimed in claim 1, wherein A is ureido.

34. The extrusion-coated metal profile as claimed in claim 1, wherein A is thiocyanato.

35. The extrusion-coated metal profile as claimed in claim 1, wherein A is mercapto.

36. The extrusion-coated metal profile as claimed in claim 1, wherein A is sulfane.

37. The extrusion-coated metal profile as claimed in claim 1, wherein A is halo.

10. A process for producing an extrusion-coated metal article, which comprises:

extruding on a surface of a metal a mixture of;

a) Q mols of alkoxysilanes which have a functional group and have the formula;

11. The process as claimed in claim 10, wherein the metal article is a profile.

12. The process as claimed in claim 11, wherein the metal article is a tube.

13. The process as claimed in claim 12, wherein the metal article is a component of an automobile.

14. The process as claimed in claim 13, wherein the metal article is a fuel line, a servo control line, a water-cooling line, a brake line or a line in an air-conditioning system.

15. The process as claimed in claim 10, wherein the surface of the metal article is aluminum, an aluminum alloy, chromatized aluminum, steel, brass or zinc.

16. The process as claimed in claim 10, wherein the polyamide molding composition has an excess of amino end groups.

17. The process as claimed in claim 10, wherein the polyamide molding composition comprises from 0.05 to 10% by weight of additives selected from the group consisting of

oxazolines,

bisoxazolines,

polyoxazolines prepared by cationic ring-opening polymerization of oxazolines,

bifunctional epoxides or, respectively, epoxy resins having an epoxy functionality of at least 2, and

adhesive resins based on acetophenone-formaldehyde resins or on cyclohexanone-formaldehyde resins.

18. The process as claimed in claim 10, wherein A is sulfane.

19. The process as claimed in claim 10, wherein A is halo.

20. The process as claimed in claim 10, wherein from the moment of melt application of the polyamide the metal article has been held for not more than 30 seconds at a temperature above T_m in the case of a crystalline molding composition and, respectively, above T_g30°

C. in the case of an amorphous molding composition.

21. The process as claimed in claim 10, wherein at least one other polymer layer is applied to the polyamide layer.

38. The process as claimed in claim 10, wherein A is amino.

39. The process as claimed in claim 10, wherein A is alkylamino.

40. The process as claimed in claim 10, wherein A is dialkylamino.

41. The process as claimed in claim 10, wherein A is amido.

42. The process as claimed in claim 10, wherein A is epoxy.

43. The process as claimed in claim 10, wherein A is acryloxy.

44. The process as claimed in claim 10, wherein A is methacryloxy.

45. The process as claimed in claim 10, wherein A is cyano.

46. The process as claimed in claim 10, wherein A is isocyanato.

47. The process as claimed in claim 10, wherein A is ureido.

48. The process as claimed in claim 10, wherein A is thiocyanato.

49. The process as claimed in claim 10, wherein A is mercapto.