Abstract:
PROBLEM TO BE SOLVED: To provide phenothiazine or a phenothiazine analog or derivative (phenothiazine material) in the form of prills of a generally spherical shape containing very low levels of fines and a method for forming the phenothiazine material in the form of prills of a generally spherical shape. SOLUTION: The product in a prill form preferably contains 99.6% of phenothiazine. The method includes dividing a fluid of the fused phenothiazine material into a plurality of droplets of a uniform size to form a solid phenothiazine material in the form of prills and cooling the droplets while keeping an inert gas atmosphere until the droplets is cooled to 140°C or lower. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A resin-rich peel ply (11) that does not leave behind residual fibers after peeling and can work well with different resin-based composite substrates (10) The resin-rich peel ply (11) is composed of a woven fabric (lib) impregnated with a resin matrix (11a) different from the resin matrix of the composite substrate (10). The peel ply (11) is designed such that, upon manual removal of the peel ply (11) from the composite substrate's (10) surface, a thin film of the peel ply resin remains on the composite substrate's surface to create a bondable surface capable of bonding with another composite substrate (12), but no fibrous material from the woven fabric remains on the same surface.
Abstract:
Resin compositions comprise an epoxy thermosetting resin; and at least two types of interlaminar toughening particles; wherein a first type of interlaminar toughening particles are insoluble in said epoxy thermosetting resin; wherein a second type of interlaminar toughening particles are partially soluble or swellable in said epoxy thermosetting resin. Prepregs and structural compounds contain these resin compositions, which are useful in the aerospace industry.
Abstract:
Embodiments of the invention are directed to resin- soluble thermoplastic veils for use in liquid resin infusion processes, methods of manufacturing resin-soluble thermoplastic veils for use in liquid resin infusion processes, and methods of manufacturing composite articles using resin-soluble thermoplastic veils for use in liquid resin infusion applications. The resin- soluble thermoplastic veils according to embodiments of the invention and of which function as a toughening agent in composites having the veil incorporated therein have improved characteristics including, but not limited to, increased uniformity and decreased thickness relative to prior art veils. These characteristics translate into improvements in the processing of a composite article including, but not limited to, a substantial or complete elimination in premature dissolution of the veil during cure. The resultant composite article also realizes improvements including, but not limited to, distribution evenness of the toughening agent throughout the composite.
Abstract:
The invention relates to a coating composition comprising a reaction product UA of at least one multifunctional aldehyde A with at least one cyclic urea U, and a crosslinkable resin having at least one kind of functional groups selected from the group consisting of hydroxyl functional groups, acid functional groups, amide functional groups, amino functional groups, imino functional groups, mercaptan functional groups, phosphine functional groups, and carbamate functional groups, characterised in that the degree of etherification, measured as the ratio «(-0-R) / «(U) of the amount of substance n(-O-R) of alkoxy groups as substituents of the aldehyde carbon atoms of the multifunctional aldehyde chemically bound in the reaction product UA to the amount of substance «(U) of cyclic urea U chemically bound in the reaction products, is less than 0.01 mol/mol, and to a process for the preparation of the reaction product UA.
Abstract:
Particle-toughened polymer compositions include a base polymer formulation and a plurality of toughening particles. In certain embodiments, the base polymer formulation includes bismaleimides or other polymer resins capable of high temperature service. A first plurality of toughening particles may include core shell rubbers. A second plurality of toughening particles may be selected from a variety of polymer compositions, including polyimides, polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether imide, polyether sulfones, and polyphenylene oxide. It is found that increasing concentration of the core shell rubbers may improve the toughness of the composition while preserving thermal properties of the composition, such as glass transition temperature.
Abstract:
Particle toughened, fiber-reinforced composites include a fiber region and an interlayer region between the fibers. The fiber region includes a plurality of fibers at least partially within a first polymer composition including a first base polymer formulation and a first plurality of toughening particles. The interlayer region includes a second polymer composition including a second base polymer formulation and at least one of the first plurality of toughening particles and a second plurality of toughening particles. Examples of first and second pluralities of toughening particles, respectively, may include core shell rubbers and polyimides. Increasing concentration of the first plurality of toughening particles may improve the composite toughness while preserving thermal properties of the composite, such as weight loss after extended duration exposure to elevated temperature. It is further discovered that the relative placement of the toughening particles influences composite mechanical properties, such as compression after impact (CAI) strength.
Abstract:
Polymer compositions capable of a high degree of curing at relatively low temperatures, and prepregs, adhesives, films and composites formed therefrom are discussed. The polymer compositions include epoxy resin systems and a dual curing system including one or more curing agents containing one or more hydrazine based curing agents having hydrazine functional groups and one or more amine curing agents containing one or more amine functional groups. The hydrazine-amine curing systems enable the polymer composition to achieve elevated levels of gelation or degree of cure at lower temperatures than are achievable with amine functional curing agents alone. Furthermore, this elevated degree of curing of the polymer composition may be achieved with substantially no reduction in tack life and/or out life of the prepreg, adhesive or film or cured state mechanical properties of composites, adhesives or other products fabricated therefrom, such as open hole compression strength and compressive strength after impact. The glass transition temperature of the cured polymer compositions is similarly unaffected.
Abstract:
Dimeric cyanoacrylate compounds of Formula (I) and Formula (II) having low volatility are provided for absorption of radiation in the UV-A region of the electromagnetic spectrum, which encompasses wavelengths between 320 nm and 400 nm. These compounds can also be blended with other UV absorbers and UV stabilizers and are useful as stabilizers of materials subject to degradation by UV radiation. An exemplary compound includes formula:
Abstract:
The suspended solids content of a process stream in a process for digesting bauxite ore to produce alumina is reduced by contacting the stream with silicon- containing polymers.