Non-shrinking, dimensionally-stable modified epoxy resins

Details Non-shrinking, dimensionally-stable modified epoxy resins Non-shrinking, dimensionally-stable modified epoxy resins

1987-11-30

1990-07-24

Nielsen, Earl

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525447, 528110, 528116, 528297, 528354, C08G 5940, C08G 5962

Patent

active

049436104

ABSTRACT:
A non-shrinking, strain-free, dimensionally-stable modified epoxy resin is disclosed for use in the fabrication of composite, structural laminates. The uniqueness of product preparation is that the optimum amount of the lactone compound can be copolymerized with the epoxy resin since equimolar amounts of each monomer do not necessarily need to be copolymerized to achieve the optimum shrink resistance. By varying the ratio of shrink-resistant monomer and epoxy in a resin blend, a means is available for controlling the shrinkage, and, in this manner, it would be possible to produce a laminate with a matrix so tailored so that reinforcing fibers would not undergo breakage, or pull out of the matrix on being stressed. The modified epoxy resin is the reaction product produced from reacting a compound selected from 6-hexanolactone and 5-norbornene-2,2-dimethanol with the diglycidyl ether of bisphenol A and cured with the curing agent hexahydrophthalic acid. The ratio of the modified-epoxy composition to epoxy can be varied to achieve the desired volume change or desired shrinkage control in the matrix resin when used in a lamination process which employs fibers selected from glass, graphite and poly-p-ethylene terephthalamide as required for high brust strength pressure uses.

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