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US 5,660,901 AGranted
Oriented expanded molded products
AssigneeThe Dexter Corporation
InventorRaymond S. Wong
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AssigneeThe Dexter Corporation
InventorRaymond S. Wong
Estimating the term…
An orientable in situ expandable layer comprising a) a blend of incompatible, in situ-expandable thermoplastic particles and a thermosettable matrix resin for the in situ-expandable thermoplastic particles which blend has the capacity of expansion in height, width and length directions and b) other insoluble and matrix-resin incompatible solid particles uniformly incorporating throughout the resin matrix, which other insoluble and matrix-resin incompatible solid particles have (i) an aspect ratio of length/width greater than 1, that defines a longitudinal axis (length) of the particles which longitudinal axis is not greater than about one inch (2.54 cm.), and (ii) thermal stability at the temperature of expansion of the resin and insolubility in the resin, and (iii) an orientation in the thermosettable resin of their length in one or two directions. Moldable compositions and methods of making the compositions and molded article from the compositions are disclosed.
A thin, drapable, curable, foamable syntactic film having an essentially uniform density and thickness across its breadth which is capable of autogenously bonding in the course of forming laminated composites and expanding in the course of said bonding to fill a desired space with minimal, micro and macro interlaminar void formation comprising a thermosettable resin having uniformly distributed therethrough (1) solid particles having an aspect ratio greater than 1 which are oriented in the direction of their length and thermally stable at the temperature of film expansion and (2) expansion-promoting materials selected from the group consisting of solid chemical blowing agents, thermoplastic particles containing expansion agents and mixtures thereof.
Dependencies are inferred from the claim text.