EP0372957A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for treating plated steel sheet
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-12-07
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Granted: —
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Expires: 2009-12-07
Abstract
Abstract The present invention relates to a process for surface treatment for cathodic electrodeposit coating of a zinc-plated or zinc alloy-plated steel sheet comprising coating and drying a protective coating material on said steel sheet chromate-treated beforehand, to form a protective film before subjecting the sheet to the cathodic electrodeposit coating, which comprises coating a protective coating material having as a principal constituent of film-forming organic component a block isocyanate-containing prepolymer containing in one and the same molecule respectively at least one blocked isocyanate group, hydroxyl group, and tertiary amino group and containing 10 - 100 parts by weight of silica sol relative to 100 parts by weight of said prepolymer, in an amount of 0.3 g - 4 g/m<2>, and then heat-drying the same.
Inventors
- 👤 Kenshi Saeki
- 👤 Takao Ogino
- 👤 Noriaki Yoshitake
- 👤 Takumi Honda
- 👤 Akira Nishihara
- 👤 Hiroshi Okita
- 👤 Yukio Tsuge
- 👤 Haruo Iizuka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
C; C23; C23C; C23C28/00; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/643; C09; C09D; C09D175/00; C09D175/04; C09D175/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12611; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A process for surface treatment for cathodic electrodeposit coating of a zinc-plated or zinc alloy-plated steel sheet comprising coating and drying a protective coating material on said steel sheet chromate-treated beforehand, to form a protective film before subjecting the sheet to the cathodic electrodeposit coating, which comprises coating a protective coating material having as a principal constituent of film-forming organic component a block isocyanate-containing prepolymer containing in one and the same molecule respectively at least one blocked isocyanate group, hydroxyl group, and tertiary amino group and containing 10 - 100 parts by weight of silica sol relative to 100 parts by weight of said prepolymer, in an amount of 0.3 g - 4 g/m 2 , and then heat-drying the same.
Claim 2
Dependent Claim
121 words
A process for surface treatment for cathodic electrodeposit coating of a zinc-plated or zinc alloy-plated steel sheet comprising coating and drying a protective coating material on said steel sheet chromate-treated beforehand, to form a protective film before subjecting the sheet to the cathodic electrodeposit coating, which comprises coating a protective coating material having as a principal constituent of film-forming organic component a block isocyanate-containing prepolymer containing in one and the same molecule respectively at least one blocked isocyanate group, hydroxyl group, and tertiary amino group and containing 10 - 100 parts by weight of silica sol relative to 100 parts by weight of said prepolymer, in an amount of 0.3 g - 4 g/m 2 , and then heat-drying the same.
Claim 3
Dependent Claim
82 words
A coated steel substrate for use in a cathodic electrodeposit coating process, comprising a steel substrate having a protective coating which is obtainable by drying a composition comprising 100 parts by weight of a blocked isocyanate-containing prepolymer having at least one blocked isocyanate group, at least one hydroxyl group and at least one tertiary amino group, and 10 to 100 parts by weight of a silica sol, the said coating being present in an amount of from 0.3 to 4g/m 2 .
Claim 4
Dependent Claim
82 words
A coated steel substrate for use in a cathodic electrodeposit coating process, comprising a steel substrate having a protective coating which is obtainable by drying a composition comprising 100 parts by weight of a blocked isocyanate-containing prepolymer having at least one blocked isocyanate group, at least one hydroxyl group and at least one tertiary amino group, and 10 to 100 parts by weight of a silica sol, the said coating being present in an amount of from 0.3 to 4g/m 2 .
Claim 5
Dependent Claim
61 words
A coating composition for use in the preparation of a coated steel substrate according to claim 2, said composition comprising 100 parts by weight of a blocked isocyanate - containing prepolymer having at least one blocked isocyanate group, at least one hydroxyl group and at least one tertiary amino group and 10 to 100 parts by weight of a silica sol.
Claim 6
Dependent Claim
24 words
A composition as claimed in claim 3, wherein the prepolymer is a prepolymer obtainable by the reaction of an aminated polyol and a polyisocyanate.
References Cited (Backward Citations)
No citation records indexed.
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