Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Reexamination Certificate
2000-05-19
2001-12-25
Copenheaver, Blaine (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
C428S318400, C521S098000, C521S148000, C521S149000, C524S080000, C524S495000
Reexamination Certificate
active
06333102
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to expandable reinforcing sheet material, particularly expandable reinforcing sheet material for vehicle outer panel comprising nitrile butadiene rubber modified epoxy resin, bisphenol A type epoxy resin, heat stabilizer, expansion agent, expansion accelerator, adhesion providing agent, heat activation type hardener, and filler, which can be expanded by heat and the gravity thereof can be reduced. The expandable reinforcing sheet material has excellent adhesion ability to the outer panel of the vehicle, good workability, vibration damping capacity can be suitable for applying to the outer panel of vehicle. The outer panel of vehicle on the backside of which the reinforcing material is attached can become lighter and thinner.
BACKGROUND OF THE INVENTION
In vehicles, use of thinner panels has been required for saving energy. This results in reduced strength, which causes automobiles insufficient surface tensional rigidity and insufficient solid appearance.
In order to solve the problems, there were proposed various processes for producing a vehicle outer panel structure having lightweightness. For example in the laid open of Japanese Patent Application No 1988-272515, there was proposed a process which comprises attaching to the backside of a panel sheet material having a three layer structure consisting a first layer which is a foamable composition comprising as essential component, a vinyl chloride resin, a plasticizer, a high temperature decomposition type expansion agent, an epoxy resin and a heat activation type hardener for epoxy resin, a second layer which is a cloth, and a third layer which is a thin metal film, and then heating the resulting panel to allow the sheet material to give resin to expand and hardening.
In this process, however, the foamable composition contains a vinyl chloride resin as a thermoplastic resin, and therefore has poor adhesion to oily surface and, when heated to give rise to expand and hardening, gives a sheet of poor heat resistance.
Hence, the process is applicable to vehicle outer panels after electro deposition but inapplicable to vehicle outer panels before electro deposition.
In the automobile industry, attaching of reinforcing sheet material to vehicle outer panel before electro deposition is strongly desired for higher productivity or for use of such a reinforcing sheet material to as many applications as possible.
Especially, the reinforcing material for the quarter panel part and the door fender panel of vehicles uses a stainless steel or a fiber grass as the restraint layer, and an unexpandable pad is adhered to the backside of the restraint layer with the thickness of 1.5~2.5 mm. And finally a releasing paper is covered on the unexpandable type pad to protect the unexpandable pad.
That is, since the quarter panel and the door fender panel of the vehicle have the curved shape, the expandable pad is used as the reinforcing sheet material of the curved portion of vehicle. Then the reinforcing sheet material for the quarter panel and the door fender panel is separated partially after electro deposition. And water or a foreign substance is inserted into the gap between the panel and the reinforcing sheet, which causes the panel of the vehicle to get rust.
On the other hand, in order to solve the problem the glass wool is used as the restraint layer, the glass wool also cannot give a sufficient solution.
SUMMARY OF THE INVENTION
The object of the present invention is to provide expandable reinforcing sheet material for curved outer panel of vehicle comprising a nitrile butadiene rubber used as basic material and polyvinyl chloride, and having excellent adhesion to the outer panel of the vehicle, good workability, vibration damping capacity.
The other object of the present invention is to provide a reinforcing sheet comprising the reinforcing sheet material above described become lighter and thicker.
The present invention to achieve the above object comprises expandable reinforcing sheet material for vehicle outer panel comprising nitrile butadiene rubber (NBR) modified epoxy resin, bisphenol A type epoxy resin, potassium-zincs thermal stabilizer, calcium carbonate, polyvinyl chloride, carbon black, azodicarbonamides expanding agent, expanding accelerator, adhesion providing agent, and dicyandiamide. This reinforcing sheet material has high ratio of expansion and the outer panel of vehicle to which the reinforcing sheet material become lighter and thinner.
REFERENCES:
patent: 63272515 (1988-11-01), None
Ju Hu Ryeong
Kim Jin Soo
Copenheaver Blaine
Hyundai Motor Company
Roché Leanna
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