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US 4,032,678 AGranted
Coated sheet metal and method of forming products therefrom
AssigneeBethlehem Steel Corporation
InventorsGuido A. Perfetti, Henry Darlington
Life of this patent
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Abstract
Sheet metal having a partially cured organic thermosetting coating thereon and method of forming drawn and ironed seamless containers therefrom.
Claims15
In a process for drawing and ironing a coated metallic sheet into seamless containers, the method which consists essentially of the steps of:
- (a) providing a metallic sheet,
- (b) applying a coating of thermosetting organic material to the surface of the metallic sheet, and
- (c) subjecting the coating of thermosetting organic material to a temperature for a time to effect a cure of the coating in the range of between about 1% and about 75% MEK insoluble residue, which cure provides a bond between the coating and the metallic sheet and a coating with sufficient extensibility to draw and iron the coated metallic sheet into a seamless container without further treatment of the coating.
A method of forming a coated seamless container comprising the steps of:
- (a) providing a sheet metal blank having a thermosetting organic coating thereon which has been cured in the range between about 1% and about 75% MEK insoluble residue,
- (b) drawing the cured coated blank into a cup preform, and
- (c) ironing the cup preform without further treatment of the coating to reduce the sidewall thickness thereof to form a coated seamless container.
In a process for drawing and ironing a coated metallic sheet into seamless containers, the method which consists essentially of the steps of:
- (a) providing a metallic sheet,
- (b) applying to the surface of the metallic sheet a coating of thermosetting organic material selected from the group consisting of:
- (i) an epoxy phenolic comprising approximately:
- 33% by weight solids consisting of about:
- 155 parts by weight epichlorohydrin bisphenol A epoxy resin (medium molecular weight)
- 45 parts by weight allyl ether of methylol phenol resin
- 1 part by weight phosphoric acid catalyst, and
- 67% by weight solvent consisting of about:
- 5 parts by weight iso-butanol
- 9 parts by weight xylene
- 4 parts by weight pentoxone
- 4 parts by weight diacetone alcohol
- 4 parts by weight isophorone
- 7 parts by weight mesityl oxide,
- (ii) an epoxy phenolic comprising approximately:
- 32. 5% by weight solids consisting of about:
- 3 parts by weight epichlorohydrin bisphenol A resin (medium molecular weight)
- 2 parts by weight xylenol formaldehyde resin, and
- 67.5% by weight solvent consisting of about:
- 2 parts by weight cellosolve acetate
- 1 part by weight butanol
- 1 part by weight xylene
- 10 parts by weight methyl iso-butyl ketone
- 6 parts by weight cellosolve,
- (iii) an epoxy urea formaldehyde comprising approximately:
- 38% by weight solids consisting of about:
- 225 parts by weight epichlorohydrin bisphenol A epoxy resin (medium molecular weight)
- 39 parts by weight urea-formaldehyde resin (50% solids in 1/1 butanol/xylene)
- 6 parts polyvinyl butyral,
- 62% by weight solvent consisting of about:
- 2 parts by weight butanol
- 4 parts by weight xylene
- 12 parts by weight cellosolve acetate
- 5 parts by weight low boiling aromatic naphtha
- 2 parts by weight nitropropane
- 6 parts by weight pine oil
- 5 parts by weight isophorone, and
- (iv) a thermosetting vinyl comprising approximately:
- 22% by weight solids consisting of about:
- 7 parts by weight vinyl solution resin (91% vinyl chloride, 3% vinyl acetate, 6% vinyl alcohol)
- 2 parts by weight epichlorohydrin bisphenol A epoxy resin (low molecular weight)
- 1 part by weight urea formaldehyde resin, and
- 78% by weight solvent consisting of about:
- 10 parts by weight high boiling aromatic naphtha
- 8 parts by weight isophorone
- 1 part by weight methyl iso-butyl ketone
- 1 part by weight butanol, and
- (c) subjecting the coating of thermosetting organic material to a temperature for a time to effect a cure of the coating in the range of between about 1% and about 75% MEK insoluble residue, which cure provides a bond between the coating and the metallic sheet and a coating with sufficient extensibility to draw and iron the coated metallic sheet into a seamless container without further treatment of the coating.
45 more elements
Dependencies are inferred from the claim text.