Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-04-10
1999-10-12
Sellers, Robert E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
523427, 523428, 523466, 525486, 525504, 525526, 525533, C08L 6300, C08L 6302, C08L 6304, C08K 336
Patent
active
059656735
ABSTRACT:
A solid, one-component, flexible epoxy-based composition and method for making the same are provided. The present compositions comprise: (a) an epoxy-terminated prepolymer formed by reacting at least four moles of a polyepoxide resin with approximately one mole of a diamine compound, wherein at least one of the polyepoxide resin and diamine compound is solid at room temperature, and wherein the prepolymer is rheologically stable for weeks as a single component mixture at room temperature and, and (b) a substantially stoichiometric amount of an epoxy resin curing agent selected from the group consisting of a heat-curable, latent epoxy resin curing agent and a room temperature-curable ketimine curing agent. Optional components include thixotropic agents, diluents, fillers, anti-oxidants, and processing aids. The present uncured epoxy-based compositions upon cure, exhibit a durometer Shore D of less than about 45 (or a durometer Shore A of less than about 100).
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Hermansen Ralph D.
Lau Steven E.
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Raufer Colin M.
Raytheon Company
Sellers Robert E.
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