Patent US814836A successfully refreshed from Google Patents.
US3663354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primer for metals
Assignee: Toyo Seikan Group Holdings Ltd
•
Filing: 1969-07-23
•
Granted: 1972-05-16
•
Expires: 1989-07-23
Abstract
Abstract A primer which is adhesive to both metals and linear polyamides, and which is a precondensate of (1) a resol type phenolic resin prepared from a mixture of phenols comprising p-cresol and trior higher functional phenol and (2) an epoxy resin. A metal article coated with the primer having a linear polyamide coat thereon, and a bonded structure of prime-coated metal sheets bonded with a linear polyamide as a cement are also disclosed.
Inventors
- 👤 Hiroshi Ueno
- 👤 Seihichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:43
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/088; B32B7/00; B32B7/04; B32B7/12; C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C08G8/28; C08L; C08L61/00; C08L61/04; C08L61/06; C09; C09D; C09D161/00; C09D161/04; C09D161/06; C09D163/00; C09D5/00; C09D5/08; C09J; C09J161/00; C09J161/04; C09J161/06; B32B2405/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
The improvement as claimed in claim 1 in which the quantity of the remaining reactive epoxy groups in the heat curable precondensate corresponds to more than 50 percent of that of the epoxy groups of the initial epoxy resin.
Claim 2
Dependent Claim
64 words
The improvement as claimed in claim 1 in which said linear polyamide is a member selected from the group consisting of polyhexamethylene adipamides, polyhexamethylene sebacamides, 6-amino caproic acid polymers, 11-amino undecanoic acid polymers, 12-amino lauric acid polymers and interpolymers of monomers in the foregoing polymers, each having a relative viscosity greater than 1.5 at a 1 percent concentration in 98 percent concentrated sulfuric acid.
Claim 3
Dependent Claim
107 words
In a primer for improving adhesion between a metal and a linear polyamide cement in the molten state, said primer consisting essentially of a heat-curable precondensate of a phenolic resol resin and an epoxy resin of a condensation product of bisphenol A and epichlorhydrin having an epoxy equivalent of 450-5,500, the improvement comprising the use of a phenolic resol resin of a condensation product of formaldehyde and a mixture of from 50-90 percent by weight of p-cresol and from 50-10 percent by weight of bisphenol A, and the weight ratio of the phenolic resol resin to the epoxy resin being in the range between 20:80 and 60:40.
Claim 4
Dependent Claim
39 words
The improvement as claimed in claim 4 in which the quantity of the remaining reactive epoxy groups in the heat curable precondensate corresponds to more than 50 percent of that of the epoxy groups of the initial epoxy resin.
Claim 5
Dependent Claim
64 words
The improvement as claimed in claim 4 in which said linear polyamide is a member selected from the group consisting of polyhexamethylene adipamides, polyhexamethylene sebacamides, 6-amino caproic acid polymers, 11-amino undecanoic acid polymers, 12-amino lauric acid polymers and interpolymers of monomers in the foregoing polymers, each having a relative viscosity greater than 1.5 at a 1 percent concentration in 98 percent concentrated sulfuric acid.
Claim 6
Dependent Claim
99 words
In a primer for improving adhesion between a metal and a linear polyamide cement in the molten state, said primer consisting essentially of a heat-curable precondensate of a phenolic resol resin and an epoxy resin of a condensation product of bisphenol A and epichlorhydrin having an epoxy equivalent of 450-5,500, the improvement comprising the use of a phenolic resol resin of a condensation product of formaldehyde and a mixture of 75 percent by weight of p-cresol and 25 percent by weight of bisphenol A, and the weight ratio of the phenolic resol resin to the epoxy resin being 30:70.
Claim 7
Dependent Claim
38 words
The improvement as claimed in claim 7 in which the quantity of the remaining reactive epoxy groups in the heat-curable precondensate corresponds to more than 50 percent of that of the epoxy groups of the initial epoxy resin.
Claim 8
Dependent Claim
64 words
The improvement as claimed in claim 7 in which said linear polyamide is a member selected from the group consisting of polyhexamethylene adipamides, polyhexamethylene sebacamides, 6-amino caproic acid polymers, 11-amino undecanoic acid polymers, 12-amino lauric acid polymers and interpolymers of monomers in the foregoing polymers, each having a relative viscosity greater than 1.5 at a 1 percent concentration in 98 percent concentrated sulfuric acid.
Claim 9
Dependent Claim
114 words
In a primer for improving adhesion between a metal and a linear polyamide cement in the molten state, said primer consisting essentially of a heat-curable precondensate of a phenolic resol resin and an epoxy resin of a condensation product of bisphenol A and epichlorhydrin having an epoxy equivalent of 450-5,500, the improvement comprising the use of a phenolic resol of a condensation product of formaldehyde and a mixture of (1) from 50-90 percent by weight of p-cresol and (2) from 50-10 percent by weight of a mixture of bisphenol A 50 parts and phenol 50 parts both by weight, and the weight ratio of the phenolic resol resin to the epoxy resin being 30:70.
Claim 10
Dependent Claim
38 words
The improvement as claimed in claim 10 in which the quantity of the remaining reactive epoxy groups in the heat-curable precondensate corresponds to more than 50 percent of that of the epoxy groups of the initial epoxy resin.
Claim 11
Dependent Claim
64 words
The improvement as claimed in claim 10 in which said linear polyamide is a member selected from the group consisting of polyhexamethylene adipamides, polyhexamethylene sebacamides, 6-amino caproic acid polymers, 11-amino undecanoic acid polymers, 12-amino lauric acid polymers and interpolymers of monomers in the foregoing polymers, each having a relative viscosity greater than 1.5 at a 1 percent concentration in 98 percent concentrated sulfuric acid.
References Cited (Backward Citations)
US25625A
Cited
US2712001A
Cited
US2864791A
Cited
US2962468A
Cited
US2970077A
Cited
US3011909A
Cited
US3006113A
Cited
US3007828A
Cited
US3030332A
Cited
US3409581A
Cited
US3488314A
Cited
US3454418A
Cited
US3563850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |