Abstract: The preparation of composites using epoxy-functional silicones as additives to phenolic resole resins.

Abstract: An aqueous composition containing a hardenable binder of a melamine compound, such as an acid-hardenable melamine-formaldehyde resin, and an acidic phosphorus compound, such as a nitrogen-containing phosphorus compound made from either phosphoric acid or phosphorus acid, and expandable graphite flake, which composition is curable to an intumescent composition.

Abstract: An intumescent composition comprising the dried product of a composition containing as essential components (1) the reaction product of aluminum oxide or aluminum hydroxide hydrate and an organic amine phosphate or a salt thereof, and (2) expandable graphite flake.

Abstract: An aqueous composition containing an acid-hardenable melamine-formaldehyde resin and a nitrogen-containing acidic phosphorus curing agent made from either phosphoric acid or phosphorous acid which is curable to an intumescent composition.

Abstract: This invention relates to a resin composition capable of being thermally cured having both a long pot life at low temperatures and a fast curing rate at higher temperatures containing a mixture of (a) a phenol-formaldehyde resole resin, and (b) a latent curing agent selected from a particular class of nitrogen-containing acidic phosphorus compounds made from either phosphoric acid or phosphorous acid.

Abstract: Described herein is a composition comprising an epoxy resin containing at least one glycidyl amine group wherein the resin contains three or more epoxide groups per molecule and a particular aromatic amine hardener. These compositions possess the necessary balance of properties required for making prepreg and afford unreinforced castings with high moduli and strength.

Abstract: Composites comprising structural fiber and matrix resin formulated from epoxys selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino- 3-ethylphenyl)methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener, toughened with porous rigid resin particles having a spheroidal spongy structure. The resulting composites exhibit surprising improvement in interlaminar strength characteristics as measured by G.sub.IC.

Abstract: Matrix resin formulations comprising cyanate esters of phenol adducts of dicyclopentadiene, epoxy resins and particular thermoplastics, provide fiber reinforced composites with excellent toughness and hot/wet properties.

Abstract: Prepreg comprising structural fiber and matrix resin formulated from epoxys selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener insoluble in said composition in an amount effective to cure said epoxy resin exhibiting improved storage stability characteristics at room temperature.

Abstract: Layered, fiber-reinforced composites toughened by the use of thermosetting matrix resins including rigid particles are improved in toughness when the particles are porous and have a spheroidal spongy structure, are formed of a polyamide. The method of the invention is particularly effective in improving the toughness of composites based on thermoset matrix resins, and particularly epoxy resins.

Abstract: Epoxy resin formulations having improved storage stability comprising epoxys selected from the group consisting of polyglcidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener insoluble in said composition at room temperature in an amount effective to cure said epoxy resin.

Abstract: Layered, fiber-reinforced composites are toughened by the use of thermosetting matrix resins including polyphenylene ether particles. The method of the invention is particularly effective in improving the toughness of composites based on thermoset matrix resins.

Abstract: Fiber-reinforced compositions comprising a structural fiber and a cyanate ester resin formulation having an N-substituted urea compound as a latent cure accelerator provide rapid-curing prepreg with good out-time characteristics. The prepreg may be used to form composite articles with good toughness and excellent retention of properties on extended exposure to moisture at elevated temperatures.

Abstract: Novel curable resin compositions are disclosed containing an aromatic cyanate ester and an allyl ether of a bisphenol as a modifier. These compositions provide improved prepregs and composites. Additional modifiers including epoxy resins and bismaleimides may be included.

Abstract: Novel curable resin compositions are disclosed containing an aromatic cyanate ester and an allyl ether of a bisphenol as a modifier. These compositions provide improved prepregs and composites. Additional modifiers including epoxy resins and bismaleimides may be included.

Abstract: Curable thermosetting resin compositions comprising at least one cycloaliphatic epoxy resin having at least two 1,2-epoxy groups per molecule, and certain aromatic diamines having three aromatic rings in the molecule are disclosed. Resin compositions comprised of, for example, bis(2,3-epoxycyclopentyl)ether and 1,3-bis(4-aminophenoxy)benzene exhibit a highly desirable balance of physical and chemical properties which renders such compositions ideally suited for use in the fabrication of wet winding composites. The resin compositions prepared in accordance with the invention have unexpectedly low viscosity, high glass transition temperatures, high tensile properties and unexpectedly low water uptake. Accordingly, the resin compositions find particular application in the preparation of composites by wet winding procedures.

Abstract: Curable thermosetting resin compositions comprising an epoxy resin having at least two 1,2-epoxy groups per molecule, an aromatic diamine hardener, and as a cure accelerator an aromatic trihydroxy compound are disclosed. The aromatic trihydroxy compound, such as for example, phloroglucinol, n-propyl gallate, or pyrogallol, improves the cure speed of the epoxy/aromatic diamine resin system, while at the same time producing cured compositions having excellent mechanical and thermal properties. The disclosed compositions find particular application in the preparation of composites by, e.g., filament winding procedures.