In the multilayer film provided with a primer layer of a specific composition comprising a polyester-based resin on a polyamide-based base layer, the adhesive strength with a hard coating layer and an OCA layer to be coated on the surface thereof is excellent, as well as the optical and mechanical properties are also excellent.

A high-concentration particle-containing film that contains a large amount of particles while having excellent flexibility is provided. The high-concentration particle-containing film of the invention includes a para-copolymerized aromatic polyamide obtained by copolymerization of para-phenylenediamine, a copolymerizing diamine and para-terephthaloyl dichloride, and particles, wherein the weight proportion of the copolymerizing diamine is in the range of 25 to 75 wt % of the entire diamine component and the particles are present at 55 vol % or greater, and the copolymerizing diamine is 3,3′-oxydiphenylenediamine, 3,4′-oxydiphenylenediamine or 4,4′-oxydiphenylenediamine.

A fiber-reinforced resin sheet includes a resin film which is thermoplastic, and a plurality of reinforcing fibers that are placed on the opposite surfaces of the resin film in a state of being oriented in the same direction after being opened from a bundle of reinforcing fibers. The resin film has a thickness of 5 μm or more and 15 μm or less, an areal weight of the reinforcing fibers is 25 g/m.sup.2 or more and 60 g/m.sup.2 or less, and a volume content of the reinforcing fibers is 60% or more and 75% or less. The fiber-reinforced resin sheet has a thickness of 30 μm or more and 65 μm or less.

Composite materials include a steel matrix with reinforcing carbon fiber integrated into the matrix. The composite materials have substantially lower density than steel, and are expected to have appreciable strength. Methods for forming composite steel composites includes combining a reinforcing carbon fiber component, such as a woven polymer, with steel nanoparticles and sintering the steel nanoparticles in order to form a steel matrix with reinforcing carbon fiber integrated therein.

The present disclosure provides a cross-linking enhanced meta-aramid and a preparation method therefor. In the method, an isocyanate is used as a cross-linking agent, treatment is performed for a period of time at a certain temperature after a catalyst is added, and then water washing, drying, and heat setting are performed to prepare a high-strength meta-aramid. With the present disclosure, a cross-linked meta-aramid is prepared and has an improved binding force between fibers and has excellent mechanical properties and high temperature resistance.

Composite materials include a steel matrix with reinforcing carbon fiber formed of individual fibers penetrating into the matrix to substantial depth. The fibers typically have defined diameters and large ratios of penetration depth to fiber diameter. Specified methods for forming the composite materials have a unique ability to achieve the large ratios of penetration depth to fiber diameter.

Composite materials include a steel matrix with reinforcing carbon fiber integrated into the matrix, and having unreinforced regions suitable for stamping or other deformation. The composite materials have substantially lower density than steel, and are expected to have appreciable strength within regions having the reinforcing carbon fiber, while having greater deformability in unreinforced regions. Methods for forming composite steel composites includes combining at least two laterally spaced apart reinforcing carbon fiber components, such as a carbon fiber weave, with steel nanoparticles and sintering the steel nanoparticles in order to form a steel matrix with reinforcing carbon fiber integrated therein, and unreinforced regions located in the lateral spaces between carbon fiber components.

A method of processing liquid crystal polymer film is provided. The method includes the following steps. A metal substrate is provided. A liquid crystal polymer film is provided. The liquid crystal polymer film and the metal substrate are laminated to form a composite layer. The composite layer is heated at a first temperature and a processed liquid crystal polymer film is obtained through the separation of the heated liquid crystal polymer film from the substrate. A processing device of liquid crystal polymer film is further provided, including a lamination member, a transport member, a heating member, and a separation member.

A method for fusing aramid fibers, wherein a) at least one area of an aramid fiber is treated with an ionic liquid so that the aramid is partially dissolved, b) the aramid fiber is contacted via the dissolved area with another aramid fiber area with pressure being applied to the contact area, and subsequently c) the partially dissolved area of the aramid is re-coagulated.

The present invention concerns an impregnated fibrous material comprising at least one continuous-fiber fibrous material in the form of a roving or a plurality of parallel rovings and at least one thermoplastic polymer matrix, characterized in that said at least one thermoplastic polymer is an amorphous or semi-crystalline polymer having a glass transition temperature such that Tg≥40° C., especially Tg≥100° C., in particular ≥120° C., the fiber content of said impregnated fibrous material being from 45 to 65% by volume, preferably from 50 to 60% by volume, especially from 54 to 60% by volume, the number-average molecular mass Mn of said thermoplastic polymer being from 11,000 to 25,000 g/mol, the melt viscosity of said thermoplastic polymer being from 80 to 1500 Pa.Math.s, as measured by plane-plane rheology at 1 Hz and 2% deformation, at a temperature of Tg+220° C.