The invention relates to a process for the production of saturated fiber structures. The process includes (a) introduction of a fiber structure onto a conveyor belt; (b) application of a solution including monomer and optionally including activator, and optionally including catalyst in at least one line to the fiber structure; (c) passage of the fiber structure with the solution through at least one roll pair in which pressure is exerted on the fiber structure; and (d) cooling of the saturated fiber structure, so that the monomer solidifies.

The invention concerns specifically emulsion polymers which are intraparticulately crosslinked via a hetero-Diels-Alder (HDA) mechanism. The crosslinked polymers can then be wholly or partly decrosslinked by thermal processing, for example in the form of a composite matrix, via a retro-Diels-Alder or retro-hetero-Diels-Alder reaction and interparticulately recrosslinked on cooling. This makes it possible to prepare long shelf life prepregs for composites. But it is also possible to thus realize other materials that have thermoset properties at use temperature but thermoplastic processing properties at a higher temperature.

The resin composite of the present invention has a polyamide-based resin expanded sheet, and a fiber-reinforced resin layer integrally laminated on a surface of the polyamide-based resin expanded sheet.

An environment-friendly impregnation solution includes in percentage by weight: 1-15% of blocked isocyanate, 0.5-10% of special amino resin, 10-50% of rubber latex, 1-5% of auxiliaries, and the balance of water, wherein the sum of the weight percentage of each component is 100%. A method for preparing the environment-friendly impregnation solution includes adding blocked isocyanate and auxiliary A into water and stirring uniformly to obtain Composition 1; adding auxiliary B into Composition 1 and stirring uniformly to obtain Composition 2; adding special amino resin into Composition 2 and stirring uniformly, then subjecting the same to grinding to obtain Composition 3; adding rubber latex into Composition 3 and stirring uniformly to obtain the environment-friendly impregnation solution, followed by packaging. The impregnation solution of the invention does not contain toxic and harmful substances such as formaldehyde and resorcinol, and the preparation method thereof is simple.

A process for the manufacture of a reinforced product comprising a matrix based on a composition and at least one reinforcing element, the reinforcing elements being embedded in the matrix, comprises: mixing of the composition based on: a compound A1 with a melting point T1, and a compound A2 with a melting point T2, at a temperature Tm such that: T1≤Tm<T2, so as to dissolve A2 in A1 and to obtain the composition in the liquid state; submerging of the reinforcing element(s) (36) in the composition; and crosslinking by heating of the composition at a temperature Tn such that: T1≤Tm<Tn.

A curable matrix resin composition containing a thermoset resin component and metastable thermoplastic particles, wherein the metastable thermoplastic particles are particles of semi-crystalline thermoplastic material with an amorphous polymer fraction that will undergo crystallization upon heating to a crystallization temperature T.sub.c. A fiber-reinforced polymeric composite material containing metastable thermoplastic particles is also disclosed.

Laminated parts are described that include a core, a fiber layer arranged on each side of the core and impregnated with a polyurethane resin, and an outer layer that at least partially coats at least one of the polyurethane impregnated fiber layers, in which the outer layer is the cured reaction product of a reaction mixture that includes: (1) a polyisocyanate, (2) a polyether polyol having a molecular weight of 800 Da to 25,000 Da and a functionality of 2 to 8, and (3) a fatty acid ester having isocyanate-reactive functionality. Methods of producing such laminated parts are also described.

A resin composition includes 100 parts by weight of a polybutadiene and 10 parts by weight to 40 parts by weight of a maleimide resin, wherein: the polybutadiene has a 1,2-vinyl content of greater than or equal to 85%; the polybutadiene has a lithium ion content of less than or equal to 100 ppm; and the resin composition is free from a polyphenylene ether resin. Moreover, an article may be made from the resin composition, including a prepreg, a resin film, a laminate or a printed circuit board.

A resin composition includes a first prepolymer and a second prepolymer, the first prepolymer being prepared from a first mixture subjected to a prepolymerization reaction, the second prepolymer being prepared from a second mixture subjected to a prepolymerization reaction, wherein the first mixture includes a maleimide resin and a benzoxazine resin, and the second mixture includes a maleimide resin and a bis(trifluoromethyl)benzidine. The resin composition may be used to make various articles, such as a prepreg, a resin film, a laminate or a printed circuit board, and at least one of the following properties can be improved, including copper foil peeling strength, dissipation factor, ratio of thermal expansion, cure shrinkage and glass transition temperature.

A resin composition is useful for preparing an article such as a prepreg, a resin film, a laminate or a printed circuit board. The resin composition includes a benzoxazine resin of Formula (1) and a maleimide resin. The article made from the resin composition has high thermal resistance, low dielectric properties and high dimensional stability and meets the processability requirements of printed circuit boards involving multiple lamination processes and multiple assembly operations.

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