Patent US4650700A successfully refreshed from Google Patents.
US4650700A
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US
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Method for surface treatment of metal blanks
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1985-10-11
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Granted: 1987-03-17
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Expires: 2005-10-11
Abstract
Abstract Surface treatment of metal blanks is achieved by applying an oxirane ring-containing compound in the gas phase to the surface of a metal blank maintained at a high temperature. According to this method, a covering layer which is much thinner than a conventional so-called adhesive primer coating layer and has a thickness of the angstrom order is formed on the surface of a metal blank. If a thermoplastic resin layer is coated on the metal surface treated with this oxirane ring-containing compound, the initial adhesion and the adhesion after lapse of time are highly improved over these adhesions attainable by the conventional methods. Even if a lacquer containing a thermosetting resin instead of the thermoplastic resin is coated and dried on the metal surface treated with this bonding compound, a similar effect can be attained. Accordingly, when an organic material is bonded or laminated to the so-treated metal surface or when metal-to-metal bonding is performed, a strong bonding can be maintained in the bonded portion.
Inventors
- 👤 Yoichi Kitamura
- 👤 Hisashi Hotta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:09
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A method for improving the bondability of metal blanks to metal or to organic materials by the surface treatment of the metal blanks, which comprises vapor-depositing a layer of from 1 to 100 Å thickness of an oxirane ring-containing compound to the surface of a metal blank maintained at a high temperature thereby improving the initial bondability and bondability with lapse of time of the surface treated metal blank to metals and organic materials.
Claim 2
Independent Claim
74 words
A method for improving the bondability of metal blanks to metal or to organic materials by the surface treatment of the metal blanks, which comprises vapor-depositing a layer of from 1 to 100 Å thickness of an oxirane ring-containing compound to the surface of a metal blank maintained at a high temperature thereby improving the initial bondability and bondability with lapse of time of the surface treated metal blank to metals and organic materials.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein the oxirane ring-containing compound is applied to the surface of the metal blank maintained at a temperature higher than 150° C.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein the oxirane ring-containing compound has a molecular weight of 330 to 900 and an epoxy equivalent value of 170 to 500.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the oxirane ring-containing compound is a bisepoxide.
Claim 6
Dependent Claim
63 words
A method according to claim 1, wherein the oxirane ring-containing compound is a liquid or low-melting-point (lower than 74° C.) epoxy resin composed mainly of a chemical structure represented by the following general formula: ##STR4## wherein A stands for a divalent aromatic hydrocarbon residue derived from a polyhydric phenol such as bisphenol A, and having an epoxy equivalent value of 170 to 500.
Claim 7
Dependent Claim
38 words
A method according to claim 1, wherein the treatment is accomplished by introducing the metal blank into a heat treatment furnace and exposing the metal blank to a high-temperature atmosphere containing a vapor of the oxirane ring-containing compound.
Claim 8
Dependent Claim
24 words
A method according to claim 1, wherein the metal blank is one having the surface treated with chromic acid chemically or by cathodic electrolysis.
Claim 9
Independent Claim
103 words
A method for the surface treatment of metal blanks, which comprises vaporizing under atmospheric pressure a liquid epoxy compound having a molecular weight of 330 to 900 and an epoxy equivalent value of 170 to 500 and exposing the surface of a metal blank maintained at a temperature higher than 150° C. to the vapor of the liquid epoxy compound, thereby forming a covering layer of the epoxy compound at a thickness of 1 to 100 Å onto the surface of the metal blank, said covering layer being capable of tightly bonding a thermoplastic resin layer to the surface of the metal blank.
Claim 10
Independent Claim
103 words
A method for the surface treatment of metal blanks, which comprises vaporizing under atmospheric pressure a liquid epoxy compound having a molecular weight of 330 to 900 and an epoxy equivalent value of 170 to 500 and exposing the surface of a metal blank maintained at a temperature higher than 150° C. to the vapor of the liquid epoxy compound, thereby forming a covering layer of the epoxy compound at a thickness of 1 to 100 Å onto the surface of the metal blank, said covering layer being capable of tightly bonding a thermoplastic resin layer to the surface of the metal blank.
Claim 11
Dependent Claim
39 words
A method according to claim 8 wherein the liquid epoxy compound is composed mainly of a chemical structure represented by the following general formula ##STR5## wherein A stands for a divalent aromatic hydrocarbon residue derived from a polyhydric phenol.
Claim 12
Dependent Claim
22 words
A method according to claim 8 wherein the metal blank has been surface treated with chromic acid chemically or by cathodic electrolysis.
Claim 13
Dependent Claim
23 words
A method according to claim 8 wherein the thickness of the covering layer of the epoxy compound is from 1 to 30 Å.
Claim 14
Dependent Claim
34 words
A method according to claim 8 wherein the surface of the metal blank is maintained at a temperature from 180° to 300° C. and is exposed to the vapor of the liquid epoxy compound.
Claim 15
Dependent Claim
34 words
A method according to claim 8 wherein the surface of the metal blank is maintained at a temperature from 200° to 250° C. and is exposed to the vapor of the liquid epoxy compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |