Abstract:
The invention relates to a particulate curing component for a thermosetting resin, the particulate curing component comprising particles of a solid resin, wherein a curative for the thermosetting resin is dispersed within the particles of solid resin. The invention also relates to methods of forming particulate curing components and compositions comprising particulate curing components.
Abstract:
B-staged composites are made using a liquid epoxy resin formulation in which the epoxy resin, hardener and catalyst are all in the liquid phase. The hardener is an aromatic amine or hindered cycloaliphatic amine. The catalyst is a mixture of a BF4 - , PF6 - , AsF6 - , SbF6 - , FeCl4 - , SnCl6 - , BiCl5 - , A1F6 - , GaCl4 - , InF4 - , Tif6 - , ZrF6 - , CIO4 - or R 4 B - salt and certain transition metal compounds. The epoxy resin formulations cure at room temperature or slightly elevated temperatures to form a B-staged material that has a glass transition temperature of 20 to 60°C and contains very little if any gelled material. The B-staged material then cures rapidly at temperatures of 120°C or above.
Abstract:
There is provided herein a flame retardant and curing agent compound for curing thermosetting resins, e.g., epoxy resins, a composition comprising a thermosetting resin, e.g., epoxy resin and the curing agent, an article comprising the curing agent, and a method of making the curing agent.
Abstract:
A curable resin composition containing: (a) at least one resin; and (b) curative selected from the group consisting of (i) a mixture of at least one low temperature curative and at least one high temperature curative or (ii) a curative that has a low temperature curative part and a high temperature curative part wherein the amount of the low temperature curative is sufficient to cause enough resin-curative addition reaction to effect B-staging in the full resin-curative formulation, the amount of the high temperature curative is sufficient to cause the resin to cure catalytically but insufficient to cause resin-curative addition reaction in the final cure, and the ratio of the resin (a) to the curative (b) is greater than or equal to about 5. The present composition may be used to make prepregs for automotive or aerospace application.
Abstract:
A prepreg comprising a layer of impregnated reinforcing fibers comprising at least one layer of reinforcing fibers impregnated by a resin composition comprising at least a thermosetting resin, a curing agent and an accelerator, such that the accelerator has a gradient concentration which is more concentrated in the resin composition in the vicinity of the reinforcing fibers than further away. The resin composition comprising a first resin composition impregnates the reinforcing fibers to provide a layer of impregnated reinforcing fibers and a surface layer comprising a second resin composition is formed on the layer of impregnated reinforcing fibers, wherein the first resin composition has at least one peak exotherm occurring at a time earlier than and/or at a temperature lower than any peak exotherm of the second resin composition, The heat generation from the first resin composition is tailored to initiate or speed up the curing of the second resin composition, leading to a substantial reduction of cure cycle time of the prepreg. Excellent handling and processing abilities of the uncured prepreg and excellent physical, thermal and mechanical properties when cured are achieved.
Abstract:
A laminar pre-preg of fibre-reinforced curable composite material. The pre-preg includes at least one layer of reinforcing fibres impregnated with a curable resin containing one or more curable thermosetting resin(s) and at least one liquid curative, wherein the curable resin exhibits a cure conversion of at least 95% when cured at a cure temperature in the range of from about 100°C to about 160°C and the cure cycle has a duration of no more than 10 minutes, and the glass transition temperature (Tg) of the curable resin when cured is in the range of from about 130°C to about 165°C.
Abstract:
La présente invention est relative à la mise en œuvre d'éthers de bis-anhydrohexitols comme diluants réactifs dans une composition réticulable de résine, d'adhésif, de revêtement ou de matrice pour composites. Non seulement ces produits permettent de diminuer avantageusement la viscosité des mélanges obtenus, mais ils conduisent aussi à une diminution très faible de la température de transition vitreuse des mélanges réticulés, comparativement à d'autres diluants réactifs et tout en améliorant de manière spectaculaire les propriétés mécaniques de ces derniers comme le module d'Young, la résistance à la traction, l'allongement à la rupture et la ténacité.