Multi-part adhesive laminates with activator carrying element
AssigneeUSM Corporation
InventorsHerbert Bauer, Gerhard Piestert
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Abstract
The invention provides improved bonding methods and bonded laminates using multi-part adhesive compositions having first and second parts. The first part of the adhesive composition comprises free radical polymerizable monomers and a source of free radicals; the second part comprises an activator for initiation of polymerization of the monomer. According to the invention, flexible, activator carrying elements are positioned between layers of the first part to provide effective bonding between substrate surfaces which may be spaced apart from each other by relatively large gaps.
Claims17
A laminate comprising two substrates with opposed surfaces spaced apart from each other by a distance greater than about 0.05 cm and bonded together by the polymerized residue of a multi-part adhesive composition having a first part comprising vinyl monomer material polymerizable to a solid state in the presence of free radicals under the influence of a non-stoichiometric quantity of an activator compound for initiating polymerization of the monomer, and having a second part comprising an activator compound for initiating polymerization of said monomer material, and a plurality of layers of woven or non-woven fabric of natural or synthetic fibrous materials each positioned between adjacent opposed surfaces of two layers of said first part and bonded to said layers.
A flexible, non-tacky activator carrying element capable of storage in layers or as a roll and for use in a multi-part adhesive composition having one part comprising a vinyl monomer material polymerizable to a solid state in the presence of free radicals under the influence of a non-stoichiometric quantity of an activator compound capable of initiating polymerization of said monomer material, said element comprising a woven or non-woven fabric of natural or synthetic fiberous material carrying an activator for said monomer material in solid form.
In a method of bonding together two substrates using a multi-part adhesive composition having a first part comprising vinyl monomer material polymerizable to a solid state in the presence of free radicals under the influence of a non-stoichiometric quantity of an activator compound for initiating polymerization of the monomer, and having a second part comprising an activator compound for initiating polymerization of said monomer material, the improvement which comprises the step of interposing between opposed surfaces of the substrates, flexible, non-tacky, activator carrying elements with each interposed element arranged in contact with layers of the first part so that the distance between opposed surfaces is greater than about 0.05 cm and pressing the substrates together to provide an adhesive bond formed by the first and second part between the substrates and where said activator carrying element comprises a woven or non-woven fabric of natural or synthetic fibrous material carrying said activator as a solid.
Dependencies are inferred from the claim text.