Abstract: Provided is a curative part usable in a two-part curable composition. The curative part includes a liquid amine; a heterogeneous dispersant; and core-shell rubber particles having an elastomeric core and a (meth)acrylic shell. The core-shell rubber particles and the heterogeneous dispersant can be collectively shear-dispersed in the liquid amine such that the core-shell rubber particles are substantially non-aggregated and the curative part is phase-stable over a period of at least 3 months at ambient temperature. Advantageously, large amounts of core-shell rubber particles can thus be incorporated into a cured resin matrix, which can afford significantly enhanced impact performance.

Abstract: An isolator for protecting adjacently located dissimilar material substrates from galvanic corrosion. The isolator includes a backing layer having opposite major surfaces and a thickness, and an optional uncured adhesive layer having one major surface bonded to one of the major surfaces of the backing layer and another major exposed surface for being adhesively bondable to a surface of one of the dissimilar material substrates. In its cured state, the adhesive layer and the backing layer are each not permanently compressible. At least one or both of the cured adhesive layer and the backing layer is polar solvent resistant enough to prevent polar solvent transported metal ions from passing all the way through its thickness. In preferred embodiments the backing layer comprises a tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (THV) material, and the adhesive layer comprises an epoxy resin.

Abstract: Provided is a curative part usable in a two-part curable composition. The curative part includes a liquid amine; a heterogeneous dispersant; and core-shell rubber particles having an elastomeric core and a (meth)acrylic shell. The core-shell rubber particles and the heterogeneous dispersant can be collectively shear-dispersed in the liquid amine such that the core-shell rubber particles are substantially non-aggregated and the curative part is phase-stable over a period of at least 3 months at ambient temperature. Advantageously, large amounts of core-shell rubber particles can thus be incorporated into a cured resin matrix, which can afford significantly enhanced impact performance.

Abstract: Provided are adhesive articles and related methods of making and use. The adhesive article includes one or more patterned adhesive layers comprising compositionally and spatially distinct adhesives that are laterally disposed relative to each other. The first and second adhesives are optionally capable of being functionally cured to provide a structural adhesive bond with a substrate. These adhesives can provide high fracture toughness and high modulus characteristics not otherwise possible in a homogeneous adhesive composition. These adhesives can provide some degree of crack arrestment and significantly reduce the need for mechanical fasteners in industrial bonding applications.

Abstract: A method for surfacing a polymeric composite article and/or for joining (for example, by bonding or by co-curing) the article and an adherend (for example, a second polymeric composite article) comprises (a) providing a cured or curable polymeric composite article; (b) providing a curable composition comprising (1) at least one thermosetting resin, and (2) at least one preformed, substantially non-functional, particulate modifier comprising at least one elastomer; and (c) directly or indirectly applying the composition to at least a portion of at least one surface of the article.

Abstract: Provided is a curable composition containing a reactive mixture of components including an polyethersulfone having a chemical group reactive with an epoxide, a cycloaliphatic polyepoxide resin, a polyepoxide having a functionality greater than two, a liquid diepoxide resin, a first curative containing 9,9-bis(aminophenyl)fluorene or a derivative therefrom and having a curing onset temperature of from 150° C. to 200° C. The components can further comprise a second curative having a curing onset temperature of from 60° C. to 180° C. When thermally curing this composition, the second epoxy curative starts to cure before the first epoxy curative, thereby inhibiting vertical flow of the adhesive during the curing process.

Abstract: Provided is a curable composition containing a reactive mixture of components including an polyethersulfone having a chemical group reactive with an epoxide, a cycloaliphatic polyepoxide resin, a polyepoxide having a functionality greater than two, a liquid diepoxide resin, a first curative containing 9,9-bis(aminophenyl)fluorene or a derivative therefrom and having a curing onset temperature of from 150° C. to 200° C. The components can further comprise a second curative having a curing onset temperature of from 60° C. to 180° C. When thermally curing this composition, the second epoxy curative starts to cure before the first epoxy curative, thereby inhibiting vertical flow of the adhesive during the curing process.

Abstract: A composition is provided comprising: a) a curable epoxy resin; and b) 0.01-30% by weight of a polycarbodiimide according to Formula I: R—{—N?C?N—R—}n—N?C?N—R??(I) wherein n is an integer between 0 and 100, and wherein each R is independently selected from aromatic and aliphatic groups which contain between 1 and 24 carbons and which are optionally substituted, typically comprising 0.1-20% by weight of the polycarbodiimide. In some embodiments the present disclosure provides sheet materials made of such cured, uncured or partially cured materials. In some embodiments these compositions may be useful in making surfacing films for composite parts and may demonstrate good paint stripper resistance and microcrack resistance.

Abstract: A method is provided for making structured hybrid adhesive articles such as lightning strike protection sheets. In the embodiment for making lightning strike protection sheets, the method comprises the steps of: a) providing an adhesive article comprising: i) a base resin comprising an epoxy resin, ii) a first epoxy curative, and iii) a second epoxy curative; b) reacting the base resin with the first epoxy curative such that the first epoxy curative is substantially reacted with epoxy resin in the article and the second epoxy curative is substantially unreacted in the article; c) embossing the adhesive article with a relief pattern; d) depositing an electrically-conductive layer onto at least a portion of the embossed surface; and e) curing the adhesive article such that the second epoxy curative is substantially reacted with epoxy in the article. In some embodiments, the method additionally comprises a step of embedding a scrim in the adhesive.

Abstract: A layered construction is provided having a storage modulus G?t25 at 25° C., comprising: a) a cured polymeric composite having a storage modulus G?s25 at 25° C.; and b) a cured surfacing film bound thereto; wherein G?t25 is not greatly elevated over G?s25, typically not more than 118% of G?s25. In some embodiments the cured surfacing film comprises an electrically conductive layer, typically a metal layer. In some embodiments the cured surfacing film comprises a cured epoxy resin which may optionally be a chain-extended epoxy resin and may excludes phosphorus. The resulting layered construction may display high erosion resistance, high corrosion resistance, and high resistance to microcracking. In another aspect, methods of making the subject layered constructions are provided.

Abstract: A method is provided for making structured hybrid adhesive articles comprising the steps of: a) providing an adhesive article comprising: i) a base resin comprising an epoxy resin, ii) a first epoxy curative, and iii) a second epoxy curative, by reacting the base resin with the first epoxy curative such that the first epoxy curative is substantially reacted with epoxy resin in the article and the second epoxy curative is substantially unreacted in the article; b) embossing the adhesive article with a relief pattern; and c) curing the adhesive article such that the second epoxy curative is substantially reacted with epoxy in the article. In some embodiments, the method additionally comprises a step of embedding a scrim in the adhesive. In some embodiments, the method additionally comprises a step of depositing an electrically conductive layer onto the surface of the adhesive article embossed with the relief pattern.

Abstract: A composition is provided comprising: a) a curable epoxy resin; and b) 0.01-30% by weight of a polycarbodiimide according to Formula I: R—{—N?C?N—R—}n—N?C?N—R??(I) wherein n is an integer between 0 and 100, and wherein each R is independently selected from aromatic and aliphatic groups which contain between 1 and 24 carbons and which are optionally substituted, typically comprising 0.1-20% by weight of the polycarbodiimide. In some embodiments the present disclosure provides sheet materials made of such cured, uncured or partially cured materials. In some embodiments these compositions may be useful in making surfacing films for composite parts and may demonstrate good paint stripper resistance and microcrack resistance.

Abstract: A polymerizable composition is described comprising a benzoxazine, and a tosylate, which when thermolyzed, forms a (meth)acrylamide, a (meth)acrylate, a vinyl ketone, a vinyl ether or a styrenic compound.

Abstract: A primer composition is presented comprising an aqueous dispersion of a) a thermosetting resin, b) an organosilane containing no hydrolyzable group, and c) a curing agent. In some embodiments, the primer composition additionally comprises d) a rare earth metal containing corrosion inhibitor. In some embodiments, the primer composition comprises no chromium. In some embodiments, the organosilane containing no hydrolyzable group is an aminosilanol. In some embodiments of the primer composition, the thermosetting resin is an epoxy resin and the curing agent is an epoxy curing agent. In some embodiments of the primer composition, the rare earth metal containing corrosion inhibitor is a cerium containing corrosion inhibitor.

Abstract: A layered construction is provided having a storage modulus G?t25 at 25° C., comprising: a) a cured polymeric composite having a storage modulus G?s25 at 25 ° C.; and b) a cured surfacing film bound thereto; wherein G?t25 is not greatly elevated over G?s25, typically not more than 118% of G?s25. In some embodiments the cured surfacing film comprises an electrically conductive layer, typically a metal layer. In some embodiments the cured surfacing film comprises a cured epoxy resin which may optionally be a chain-extended epoxy resin and may excludes phosphorus. The resulting layered construction may display high erosion resistance, high corrosion resistance, and high resistance to microcracking. In another aspect, methods of making the subject layered constructions are provided.

Abstract: Novel oligomers and polymers derived from the reaction of benzoxazine compounds with a mixture of epoxy compounds and amine compounds are disclosed. The compositions are useful in coating, sealants, adhesive and many other applications.

Abstract: Adhesive compositions are provided comprising: a) a base resin comprising an epoxy resin; b) a first epoxy curative; and c) a second epoxy curative; wherein the first and second epoxy curatives are chosen such that the second epoxy curative may remain substantially unreacted in the composition under conditions of temperature and duration that render the first epoxy curative substantially reacted with epoxy resin in the composition. In some embodiments, the first epoxy curative is substantially reacted with epoxy resin in the composition and the second epoxy curative is substantially unreacted in the composition. In some embodiments, the adhesive composition is used in the form of an adhesive film.

Abstract: A polymerizable composition comprising a benzoxazine compound and a catalyst is described. The polymerizable composition may be cured to produce compositions useful in coating, sealants, adhesive and many other applications.

Abstract: A polymerizable composition, articles, and methods are provided, wherein the polymerizable composition includes a benzoxazine, an acid-forming peroxide catalyst and optionally a film-forming polymer, a co-catalyst, a curative, or a combination thereof.

Abstract: The inventors of the present disclosure recognized that elimination or reduction of the silver paste and/or silver busbars on the front and/or rear surfaces of solar cells and solar modules would advantageously lower the total cost of the solar cell and/or solar module. The inventors of the present disclosure recognized that the silver paste on the front and rear surface of solar cells or solar modules can be eliminated or the amount of silver paste reduced by replacing the silver busbars with a solderable tape including a conductive metal foil and a nonconductive adhesive.