Stock material or miscellaneous articles – Composite – Of epoxy ether
Reexamination Certificate
1999-01-25
2001-07-31
Nakarani, D. S. (Department: 1773)
Stock material or miscellaneous articles
Composite
Of epoxy ether
C428S418000, C428S450000, C428S451000
Reexamination Certificate
active
06268056
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention broadly relates to a new seal assembly wherein a novel resin stabilized adhesive composition is used for bonding the rubber or elastomeric seal material to a metal or plastic insert member.
The state of the prior art is indicated by the following cited references, U.S. Pat. Nos.: 3,869,340; 3,887,602; 4,052,524; 4,246,145; 4,323,488; 5,470,662; and 5,633,038.
In the past it has been known to adhesively bond insert members, such as inserts made of either metal or plastic, to a rubber or elastomer sealing material using various types of bonding adhesives. Previous aqueous organosilane adhesives tended to be very unstable and sensitive to changes in pH, temperature, and other environmental conditions. Such organosilane adhesives also provided little environmental resistance and therefore tended to de-bond or separate under numerous commonly encountered environmental conditions. Another problem with the past silane adhesives is their inability to build adequate film thickness for many required applications.
SUMMARY OF THE INVENTION
It has been unexpectedly discovered, in accordance with this invention, that through the use of water dispersable epoxy resins in formulating the adhesives composition of this invention that there has been obtained greatly improved stability and environmental resistance, and adhesive film build-up is also significantly improved. It has also been discovered that the past stability has been increased by approximately 30 times, through the use of the inventive techniques disclosed herein. The film build-up characteristics of the previously known silane adhesives has been increased by a factor of approximately five times. Also it has been found that through the use of the invention described herein the environmental resistance is greatly improved.
REFERENCES:
patent: 5395697 (1995-03-01), Morrison
patent: 5789080 (1998-08-01), Grimberg et al.
Dinnin & Dunn P.C.
Freudenberg-NOK General Partnership
Nakarani D. S.
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