The present invention relates to a polyurethane resin composition for preparing a polyurethane composite, having (a) an organic polyisocyanate; (b) an isocyanate-reactive component having (b1) one or more polyether carbonate polyols which are prepared by addition of carbon dioxide and alkylene oxides onto starters having active hydrogen using DMC catalysts, and (b2) one or more polyols which have a functionality of 2-6 and are selected from polyether polyols, polyester polyols, polymer polyols or combinations thereof; and (c) a blowing agent having an amount of 0-0.2 wt. % based on 100% by weight of the isocyanate-reactive component (b).

High tenacity, high elongation multi-filament polymeric tapes as well as ballistic resistant fabrics, composites and articles made therefrom. The tapes are fabricated from multi-filament fibers/yarns that are twisted together, bonded together, compressed and flattened.

High tenacity, high elongation multi-filament polymeric tapes as well as ballistic resistant fabrics, composites and articles made therefrom. The tapes are fabricated from multi-filament fibers/yarns that are twisted together, bonded together, compressed and flattened.

A process to create composite preforms and parts by stacking layers of two-dimensional fiber material (e.g., fiber cloth, fiber reinforced fabric, etc.) having pin-receiving holes and/or gaps disposed between the fibers of the fiber material is described. The stack is pinned together using a subset of pins, such as fiber reinforcing pins, inserted into a subset of the pin receiving holes and/or gaps, leaving at least some of the pin receiving holes and/or gaps available for pinning other layers, as layers of fiber material are added to the stack. As additional layers are added to the stack, different subsets of pins connect the additional layers to the stack, thereby building up the stack. Each layer of fiber material may have a different shape than the other layers and any arbitrary topology, potentially including non-convex and/or disjoint shapes. Furthermore, implementations may produce composite preforms having an arbitrary number of interconnected layers.

The invention relates to an intermediate product intended for the production of a composite part in combination with a resin matrix, formed by at least two unidirectional sets of reinforcing yarns, the yams of each set extending in a different direction, whereby the sets are interlinked by means of stitching or knitting using at least one stitching or knitting yarn. The invention is characterized in that the stitching or knitting yarn has a yarn count of less than or equal to 30 dTex, preferably less than or equal to 25 dTex, in accordance with standard EN ISO 2060.

Processes for producing near net-shape panels and panels formed thereby. The processes include forming a preform to comprise a stack of multiple plies that contain an uncured expandable foam material. The preform has regions that differ from each other by the number and/or volume of the plies therein. The preform and its plies are then cured within a restricted volume to produce a near net-shape panel. The curing step causes the expandable foam material to expand, and the restricted volume is sized so that the number and volume of the plies within the regions of the preform cause zones within the panel to have different densities and/or thicknesses.

Processes for producing near net-shape panels and panels formed thereby. The processes include forming a preform to comprise a stack of multiple plies that contain an uncured expandable foam material. The preform has regions that differ from each other by the number and/or volume of the plies therein. The preform and its plies are then cured within a restricted volume to produce a near net-shape panel. The curing step causes the expandable foam material to expand, and the restricted volume is sized so that the number and volume of the plies within the regions of the preform cause zones within the panel to have different densities and/or thicknesses.

A hot press cushioning material (10) of the present invention includes, as a base material, a woven fabric layer (11) using bulky yarn (12) as at least one of the warp and weft, and a nonwoven fabric layer (14) placed on one surface side of the woven fabric layer (11), a part of the nonwoven fabric layer (14) being embedded in the woven fabric layer (11). A nonwoven fabric-resin composite layer (18) is formed in the opposite surface of the nonwoven fabric layer (14) from the woven fabric layer (11) by impregnation with resin (15). A woven fabric-rubber composite layer (19) is formed in the other surface of the woven fabric layer (11) by impregnation with rubber (16). The nonwoven fabric-resin composite layer (18) and the woven fabric-rubber composite layer (19) have voids (17) therein.

A hot press cushioning material (10) of the present invention includes, as a base material, a woven fabric layer (11) using bulky yarn (12) as at least one of the warp and weft, and a nonwoven fabric layer (14) placed on one surface side of the woven fabric layer (11), a part of the nonwoven fabric layer (14) being embedded in the woven fabric layer (11). A nonwoven fabric-resin composite layer (18) is formed in the opposite surface of the nonwoven fabric layer (14) from the woven fabric layer (11) by impregnation with resin (15). A woven fabric-rubber composite layer (19) is formed in the other surface of the woven fabric layer (11) by impregnation with rubber (16). The nonwoven fabric-resin composite layer (18) and the woven fabric-rubber composite layer (19) have voids (17) therein.

A composite material of particles disposed in a matrix material is provided in which the particles have an asymmetric geometric shape with a longest dimension and a shortest dimension different from the longest dimension. Adjacent volume portions of the composite material are arranged in a mosaic pattern to abut along an interface or surface forming a common boundary between the adjacent volume portions. The particles within the adjacent volume portions are arranged with differing orientations with respect to the interface. The orientations of the particles in the adjacent volume portions are selected so that a crack propagating on a crack propagation path through one or the other of the adjacent volume portions stops at or deflects to propagate along the interface. Methods of making composite materials are also provided.