Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-03-02
1984-10-09
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525119, C08L 6300, C08L 6308
Patent
active
044762852
ABSTRACT:
A rubber-modified epoxy adhesive and the method of making the same is dissed for use in bonding graphite-epoxy composite structures. The adhesive comprises a two-part formulation, one part being a reaction product of a carboxyl terminated reactive liquid rubber prereacted with a bisphenol A epoxy resin so that linear epoxy-rubber chains are developed. The second part of the adhesive is an amine curing agent. One effective example of the adhesive is formulated as follows: approximately 4 parts by weight of the bisphenol A epoxy resin is mixed per part of a carboxyl terminated butadiene acrylonitrile rubber and heated to 170.degree. C. At 160.degree. C., a catalyst of approximately 0.01 parts by weight of triphenyl phosphene per part of the rubber is added and the mixture stirred for one hour at 170.degree.-175.degree. C. to provide the reaction product. After cooling to room temperature, the reaction product may be packaged in premeasured quantities for mixture, when required, with a curing agent of cycloaliphatic diamine at a ratio of approximately 4:1.
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Crabtree David J.
Park Elizabeth Y.
Beers Robert F.
Hansen Henry
Lieberman Allan M.
The United States of America as represented by the Secretary of
Vozzo, Jr. Armand M.
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