Coating processes – Solid particles or fibers applied – Uniting particles to form continuous coating with...
Reexamination Certificate
2000-01-04
2001-11-13
Lovering, Richard D. (Department: 1712)
Coating processes
Solid particles or fibers applied
Uniting particles to form continuous coating with...
C427S257000, C524S904000, C525S533000, C525S934000, C528S091000
Reexamination Certificate
active
06316049
ABSTRACT:
The present invention relates to a coating powder which fuses and cures to form a coating with a wrinkle finish. Fusing and cure proceed at low temperatures making the coating powder suitable for coating heat-sensitive substrates, such as wood.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,341,819, the teachings of which are described herein by reference, describes a coating powder which produces a wrinkle finish. The resin of this coating powder is epoxy, the cross-linking agent is methylenedisalicylic acid, and the cure catalyst borontrichloride ethylamine complex (BCl
3
:NH
2
Et). The selection of the methylenedisalicylic acid in this patent as the cross-linking agent is responsible for the wrinkled appearance of the fused and cured coating. Homologues of methylenedisalicylic acid were later found to be suitable, and in some cases preferable, for achieving a wrinkle finish, as described in U.S. Pat. Nos. 5,688,878 and 5,780,560, the teachings of each of which are incorporated herein by reference. Wrinkle finish epoxy resins are also described in U.S. Pat. No. 5,932,288, the teachings of which are incorporated herein by reference.
The coating powders described in the above-identified patents are primarily useful for coating substrates, such as metal, which are not heat sensitive. This is particularly true because in order that these coating powders produce a wrinkle finish, the curing must be conducted at relatively high temperatures, e.g., 375° F. (191° C.) or above.
Wrinkle finishes, such as are produced in the above-referenced patents, may be desired on heat-sensitive substrates, such as wood; wood products, including fiberboard, paper, etc.; and certain plastics. Accordingly, it is a general object of the present invention to provide coating powders which fuse and cure to provide wrinkle finishes at temperatures appropriate for the coating of heat-sensitive substrates.
SUMMARY OF THE INVENTION
It is found that wrinkle finish epoxy coating powders of the type employing an epoxy resin and methylenedisalicylic acid and/or a methylenedisalicylic acid homologue fuse and cure to a wrinkle finish at a substantially lower temperature than prior art compositions if borontrichloride amine complexes are replaced with borontrifluoride amine complexes.
REFERENCES:
patent: 2824083 (1958-02-01), Parry et al.
patent: 3293322 (1966-12-01), Pennino
patent: 3384610 (1968-05-01), Lee
patent: 4341819 (1982-07-01), Schreffler et al.
patent: 5688878 (1997-11-01), Decker et al.
patent: 5780560 (1998-07-01), Decker et al.
patent: 5932288 (1999-08-01), Decker et al.
patent: 5936057 (1999-08-01), Baudoul et al
patent: 1043998 (1966-09-01), None
patent: 1069438 (1967-05-01), None
Cramer Michele L.
Decker Owen H.
Tarnoski Charles P.
Lovering Richard D.
Rohm and Haas Company
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