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US 4,393,116 AGranted
Shaped materials
AssigneeFastbac Research Limited
InventorDerek P. Taylor
Life of this patent
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AssigneeFastbac Research Limited
InventorDerek P. Taylor
Estimating the term…
A soft permeable material, such as a foamed plastics material or a fibrous material is shaped, and optionally provided with one or more facing layers, by applying to the faces thereof a polyurethane based prepolymer composition under such conditions that a non-tacky coating having latent adhesive properties is formed. The coated material may be stored for a period of several months and subsequently shaped by the application of heat and pressure sufficient to cure the pre-polymer. Facing layers can be bonded thereto simultaneously without the application of additional adhesive substance. The latent adhesive substance may be applied to the permeable material in solution or in the form of a dry film. In the latter case the film may be applied initially to a facing layer. The latent adhesive substance may be used to form reclaimed waste material into a coherent mass which can subsequently be shaped and faced without the application of further adhesive substance.
A soft permeable material having on at least one face thereof a coating of a substance having latent adhesive capacity to form a treated material, said substance containing a pre-polymer and which under normal conditions is stable but is activated by heat alone at a temperature above about 80.degree. C. to undergo a chemical reaction and act as an adhesive forming a strong permanent bond, whereby said treated material may be shaped by applying mechanical compressive force so as to impart the desired shape thereto under the application of said heat such that the latent adhesive substance is activated and cured to the extent necessary to hold said treated material in the desired shape, wherein said treated material can be stored for several months, and wherein the substance is substantially non-tacky prior to being activated but is irreversibly converted to a strong adhesive after activation and curing.
A facing material having thereon on one face thereof a dry film of a substance having latent adhesive capacity to form a treated material, said substance containing a pre-polymer and which under normal conditions is stable but is activated by heat alone at a temperature above about 80.degree. C. to undergo a chemical reaction and act as an adhesive forming a strong permanent bond, whereby said treated material may be applied to the surface of a soft permeable material and bonded thereto whilst said soft permeable material is shaped by the application of mechanical compressive force so as to impart the desired shape thereto under the application of said heat such that the latent adhesive substance is activated and cured to the extent necessary to hold said soft permeable material in the desired shape and bond said facing material thereto, wherein said treated material can be stored for several months, and wherein the substance is substantially non-tacky prior to being activated but is irreversibly converted to a strong adhesive after activation and curing.
A method of shaping a soft permeable stock material by the steps of
Dependencies are inferred from the claim text.