Abstract: Urea compounds having a plurality of substituents selected from hydrogen, substituted hydrocarbyl radicals and unsubstituted hydrocarbyl radicals are good latent cure accelerators for thermosetting cyanate resin formulations. The resulting cyanate resin formulations are useful as coatings, adhesives and as impregnating resins, particularly in applications where extended storage at or near room temperature is desired.

Abstract: Described herein are tough solvent resistant materials from a crystallizable, crosslinkable resin mixture comprising a particular polyarylether and a crystallization promoting plasticizer, and reinforced composites made from such resin mixture.

Abstract: A method of molding fiber-reinforced thermoset resin articles having improved mechanical properties. A thermosettable organic material is injected into a mold containing a fiber web. The molding composition includes (a) a thermosettable organic material containing two or more polymerizable carbon-carbon double bonds, (b) an ethylenically unsaturated monomer which forms a liquid homogeneous mixture with and is copolymerizable with (a) and is different from (a), and (c) an effective amount of an initiator or a mixture of initiators characterized by a ten-hour half life temperature, or in the case of a mixture of initiators, and average ten-hour half life temperature, of greater than about 50.degree. C. and less than 105.degree. C., which produces on decomposition less than 1.0 milliliter of gas per gram of resin as measured at a temperature of 25.degree. C. and a pressure of one atmosphere.

Abstract: Urea compounds having a plurality of substituents selected from hydrogen, substituted hydrocarbyl radicals and unsubstituted hydrocarbyl radicals are good latent cure accelerators for thermosetting cyanate resin formulations. The resulting cyanate resin formulations are useful as coatings, adhesives and as impregnating resins, particularly in applications where extended storage at or near room temperature is desired.

Abstract: Described herein is a composition which contains a specific group of hardeners, an epoxy resin and a thermoplastic polymer. When combined with a structural fiber the composition produces composites which have improved impact resistance, improved tensile properties and high compressive properties.

Abstract: Diamines of the structure ##STR1## Wherein X is --SO.sub.2 -- or --CO--, Y is O or S, and Ar is a linear aryl ether moiety comprising from 1 to 80 aryl rings, are epoxy resin curing agents providing cured resins with improved moisture resistance and toughness. The resins are particularly useful in preparing prepregs and composites.

Abstract: Described herein are novel bismaleimides and prepregable resin compositions comprising these bismaleimides and one or more liquid coreactants and optionally, one or more other additives.

Abstract: Described herein is a composition which contains a specific group of hardeners, an epoxy resin and a thermoplastic polymer. When combined with a structural fiber the composition produces composites which have improved impact resistance, improved tensile properties and high compressive properties.

Abstract: This invention relates to low shrinking, low viscosity curable polyester resin compositions, which compositions contain a mixture of (i) an unsaturated ester terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof, (ii) a copolymerizable ethylenically unsaturated monomer which serves to crosslink the unsaturated polyester to a thermoset product, and (iii) a thermoplastic polymer low profile additive. Cured articles prepared from these curable polyester resin compositions exhibit reduced surface roughness. Fiber reinforced thermoset articles can be produced from these curable resin compositions.

Abstract: Described herein are compositions which contain a specific group of oligomeric diamine hardeners and epoxy compounds which when combined with structural fibers produce composites which have improved tensile properties, high compressive strengths, and improved impact resistance. These compositions also exhibit low moisture absorption.

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.

Abstract: Described herein is a composition comprising a select group of substituted diamine hardeners and an expoxy resin containing two or more 1,2-epoxide groups per molecule. These compositions exhibit reduced moisture absorption, and controlled reactivity which comprises the processing characteristics of the composition.

Abstract: Described herein is a composition which contains bis(2,3-epoxycyclopentyl) ether, a specific group of hardeners and a specific group of thermoplastics. When cured, these compositions have improved tensile properties as compared to similar compositions which do not contain thermoplastics.

Abstract: This invention relates to low viscosity curable polyester resin compositions and a process for the preparation thereof, which compositions contain a mixture of (i) an unsaturated ester terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof and (ii) a polymerizable ethylenically unsaturated monomer which serves to crosslink the unsaturated ester to a thermoset product. Fiber reinforced thermoset articles can be produced from these low viscosity curable polyester resin compositions.

Abstract: This invention relates to a process for producing low viscosity curable polyester resin compositions, which compositions contain a mixture of (i) an unsaturated ester terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof and (ii) a polymerizable ethylenically unsaturated monomer which serves to crosslink the unsaturated ester to a thermoset product. Fiber reinforced thermoset articles can be produced from these curable polyester resin compositions.

Abstract: This invention relates to a process for producing polyester compositions which are terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof. These polyester compositions have utility in resin systems for moldings, coatings, sealants and adhesives, and also as reactive diluents.

Abstract: This invention relates to low viscosity polyester compositions which are terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof, and a process for the preparation thereof. These low viscosity polyester compositions have utility in resin systems for moldings, coatings, sealants and adhesives, and as reactive diluents.

Abstract: The tensile properties and compressive strength of composites comprising epoxy resins and structural fibers are improved by the inclusion of a novel class of polynuclear aromatic diamine hardners exemplified by 4,4'-bis-(4-aminophenoxy) diphenyl sulfone and its analogs.

Abstract: Described herein is a curable physical mixture comprising (a) an active hydrogen containing compound selected from a polyol, a polyamine, an amino alcohol, or mixtures thereof, (b) an unsaturated carboxylic anhydride, and (c) an ethylenically unsaturated monomer. These mixtures are cured to give a thermoset crosslinked composition.

Abstract: Described herein are curable liquid homogeneous mixtures used for the rapid production of fiber-reinforced thermoset resin articles which comprise:(a) a vinyl ester of the following formula: ##STR1## wherein the R's are independently hydrogen or methyl, R.sub.1 is the residue of a cycloaliphatic or aromatic diol and n has an average value of from 1 to about 5.(b) a second crosslinkable oligomer containing two or more unsaturated groups selected from acrylates, methacrylates and fumarate diesters; and(c) a monoethylenically unsaturated monomer, wherein the ratio of (a) to (b) is greater than about 0.3.