US5151297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic acrylic coated steel sheet
Assignee: Armco Steel Co LP
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Filing: 1990-03-26
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Granted: 1992-09-29
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Expires: 2010-03-26
Abstract
Abstract Zinc or zinc alloy plated steel sheet ready for deep drawing coated with 1-5 gm/m 2 of a dry, tack free continuous thermoplastic acrylic coating. The coating is formed by inductively heating the sheet to a temperature of about 149°-246° C. for no more than 10 seconds after being roll coated with a continuous liquid film of an aqueous solution including an acrylic polymer. The acrylic coating forms a protective film that is impervious to moisture, oil, and dirt, is able to be welded and adhesively bonded and possesses sufficient toughness and lubricity to allow deformation of the sheet without additional external lubricant. A deep drawn article formed from the sheet has enhanced painting characteristics after the acrylic coating is removed and the article is coated with a phosphate coating.
Inventors
- 👤 Douglas J. Robbins
- 👤 Cynthia A. Gosselin
- 👤 Frederick A. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:30
CPC Classifications
C; C23; C23C; C23C2/00; C10; C10M; C10M173/00; C10M173/02; C10M107/00; C10M107/20; C10M107/22; C10M107/28; C10M2201/00; C10M2201/02; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/0845; C10M2209/086; C10M2209/0863; C10N; C10N2040/00; C10N2040/20; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01; C10N2050/015; C10N2050/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A method of forming a dry lubricant coating on steel ready for deep drawing, including the steps of: providing a steel sheet, the surfaces of said sheet being uncoated or metallic coated, providing an aqueous solution of a thermoplastic polymer, said thermoplastic polymer consisting essentially of acrylic and small amounts of auxiliary substances from the group of a rust inhibitor, a wetting agent, a wax and an antifoaming agent, roll coating a continuous liquid film of said solution onto at least one side of said sheet, inductively heating said sheet to a temperature of about 149°-246° C. for no more than 10 seconds to form a coating containing more than 50 wgt. % of said acrylic polymer, the outer coated surface of said sheet being dry and tack free, said coating being impervious to moisture, oil, dirt, and capable of being welded and adhesively bonded, said coated sheet being ready for deep drawing without additional external lubricant.
Claim 2
Independent Claim
157 words
A method of forming a dry lubricant coating on steel ready for deep drawing, including the steps of: providing a steel sheet, the surfaces of said sheet being uncoated or metallic coated, providing an aqueous solution of a thermoplastic polymer, said thermoplastic polymer consisting essentially of acrylic and small amounts of auxiliary substances from the group of a rust inhibitor, a wetting agent, a wax and an antifoaming agent, roll coating a continuous liquid film of said solution onto at least one side of said sheet, inductively heating said sheet to a temperature of about 149°-246° C. for no more than 10 seconds to form a coating containing more than 50 wgt. % of said acrylic polymer, the outer coated surface of said sheet being dry and tack free, said coating being impervious to moisture, oil, dirt, and capable of being welded and adhesively bonded, said coated sheet being ready for deep drawing without additional external lubricant.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said coating has a coefficient of friction of no greater than about 0.05.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said coating is 1-5 gm/m 2 on said one side.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said metallic coating is zinc or a zinc alloy.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said coating is 1.2-3.4 gm/m 2 on said one side.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |