Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1993-06-25
2001-01-23
Gallagher, John J. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C072S042000, C156S216000, C428S420000, C523S427000, C523S428000, C523S451000
Reexamination Certificate
active
06176965
ABSTRACT:
The present invention relates to a bonded structure of an Aluminum (Al) alloy pressed plate and more particularly, to a bonded structure in which a member is bonded onto a surface of an Al alloy pressed plate which has a lubricant layer by use of an epoxy resin based adhesive.
Currently, in the fabrication of an Al alloy pressed plate, an Al alloy sheet having a lubricant layer on the surface thereof is used as a starting material in order to increase the productivity. When another member is to be bonded onto such a pressed plate by use of an epoxy resin based adhesive, the pressed plate is subjected to a degreasing treatment prior to the bonding operation to remove the lubricant layer and then the plate is subjected to a chemical conversion treatment to form an oxidized film having good durability, because the naturally oxidized film on the surface of the pressed plate does not have a sufficient durability.
However, if the pressed plate must be subjected to the degreasing and chemical conversion treatments as described above, many steps are required, thereby resulting in a hindrance to productivity.
Accordingly, it is an object of the present invention to provide a bonded structure of the type described above, where the need for the degreasing and chemical conversion treatments can be eliminated by using a particular epoxy resin based adhesive.
According to the present invention, there is provided a bonded structure of an Al alloy pressed plate, in which a member is bonded onto a surface of an Al alloy pressed plate which has a lubricant layer by use of an epoxy resin based adhesive, wherein the adhesive contains an epoxy resin, a dehydrated phosphate and a latent curing agent, with the epoxy resin comprising at least one resin selected from the group consisting of a bisphenol epoxy resin (bisphenol resin), a rubber-modified bisphenol epoxy resin, a urethane-modified epoxy resin, a polyester type epoxy resin, and some combinations thereof.
With the above feature, the polyester type epoxy resin has a good compatibility with the lubricant layer, while the bisphenol epoxy resin and the like exhibit higher adhesive strength. Moreover, the dehydrated phosphate produces a chelate compound with Al ions of the pressed plate to suppress a reduction in strength due to water in the naturally oxidized film, which forms on the surface of the pressed plate. Therefore, if such an adhesive is used, and even if no degreasing and chemical conversion treatments are conducted, the pressed plate and the other member can be bonded firmly, and the durability of the bonded structure can be increased.
REFERENCES:
patent: 4845136 (1989-07-01), Saito et al.
patent: 4869764 (1989-09-01), Marwick
Okui Kazuyuki
Shiokawa Makoto
Gallagher John J.
Honda Giken Kogyo Kabushiki Kaisha
Lyon & Lyon LLP
LandOfFree
Method for producing a bonded structure of aluminum alloy... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for producing a bonded structure of aluminum alloy..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing a bonded structure of aluminum alloy... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2533199