4-methyl-1-pentene based resin foam containing a 4-methyl-1-pentene based resin, and having an expansion ratio of 3 times or more is prepared. When measured in a decalin solvent at 135° C., an intrinsic viscosity [η] of the 4-methyl-1-pentene based resin may be 0.5 to 5 dl/g. The 4-methyl-1-pentene based resin may have a glass transition temperature of 0° C. to 80° C. The 4-methyl-1-pentene based resin may have a melting point. The 4-methyl-1-pentene based resin may be a 4-methyl-1-pentene/C.sub.2-20α-olefin copolymer (in particular, 4-methyl-1-pentene/C.sub.2-4α-olefin copolymer). The expansion ratio of the 4-methyl-1-pentene based resin foam may be 10 times or greater.

The present invention relates to a method of making a foamed cellulosic fiber-thermoplastic composite article. The method includes the steps of providing a copolymer composition, combining the copolymer composition and cellulosic fibers, applying heat, mixing energy and pressure to form a foamable mixture, and forming the foamable article in a molding or extruding operation. The method is characterized in that at least 10% of the cellulosic fibers have been thermally modified prior to being combined with the copolymer composition.

The present invention relates to a method of making a foamed cellulosic fiber-thermoplastic composite article. The method includes the steps of providing a copolymer composition, combining the copolymer composition and cellulosic fibers, applying heat, mixing energy and pressure to form a foamable mixture, and forming the foamable article in a molding or extruding operation. The method is characterized in that at least 10% of the cellulosic fibers have been thermally modified prior to being combined with the copolymer composition.

A fiber-reinforced resin composite having high peeling strength between a fiber-reinforced resin and a resin foam. The fiber-reinforced resin composite (10) is a fiber-reinforced resin composite (10) including a skin (11) and a resin foam (12), the resin foam including a foamed resin (16), the skin including a fiber sheet (14), a thermoplastic matrix resin (15), and the foamed resin (16) that is continuous from the resin foam and is impregnated into the skin.

A skin-covered foamed molded article having excellent lightweight property, bending rigidity, and favorable dimensional stability, which includes: a skin material composed of a hollow molded body produced by blow-molding an extruded parison; and an expanded bead molded article located inside the skin material, wherein the skin material has an average wall thickness of from 1.0 mm to 5.0 mm, the skin material includes a glass fiber-reinforced polypropylene-based resin containing glass fiber in a range of from 5 mass % to 30 mass %, the glass fiber has a weight-average fiber length of from 0.4 mm to 1.5 mm, the expanded bead molded article includes a polypropylene-based resin, the peeling strength between the skin material and the expanded bead molded article is 0.1 MPa or higher, and the longitudinal linear expansion coefficient of the skin-covered foamed molded article (100) at from 23° C. to 80° C. is 7×10−5/° C. or lower.

A closed cell crosslinked polyolefin foam sheet comprises an opposing first surface region and second surface region, and an intermediate region disposed therebetween, wherein the intermediate region is configured to have a gel content lower than an average gel content of the first surface region and the second surface region to enable a controlled tear propagation within the intermediate region when a splitting force is applied to the closed cell crosslinked polyolefin foam sheet. For example, a ratio of a gel content of the intermediate region versus an average gel content of the first surface region and the second surface region may be about 75% or less, and a ratio of the average cell size of the intermediate region versus an average cell size of the first surface region and the second surface region may be about 125% or higher.

To provide a composite comprising a resin foam and a resin member different from the resin foam, which can suppress deterioration of the outer appearance of the resin member.

A composite comprising a resin foam formed by using a blowing agent containing 1-chloro-2,3,3,3-tetrafluoropropene, and a resin member different from the resin foam, containing a resin selected from the group consisting of a polycarbonate resin, a polystyrene resin, a polyphenylene ether resin, an acrylonitrile/butadiene/styrene resin and a styrene/acrylonitrile copolymer resin.

A foam molded article includes a main agent resin, a filler of greater than or equal to 15% by mass and less than or equal to 80% by mass, and a foaming agent of greater than or equal to 0.01% by mass and less than or equal to 10% by mass, and a foaming ratio caused by the foaming agent is greater than or equal to 1.1 times.

A foam molded article includes a main agent resin, a filler of greater than or equal to 15% by mass and less than or equal to 80% by mass, and a foaming agent of greater than or equal to 0.01% by mass and less than or equal to 10% by mass, and a foaming ratio caused by the foaming agent is greater than or equal to 1.1 times.

A process for producing a polymeric article is provided that includes: sequentially filling a female mould (11) with a first, second, and third batches, wherein the first and third batches include first and third polymeric materials (1p, 3p), and the second batch includes a second polymeric material (2p) and a blowing agent (2b), closing the thus filled cavity with a lid (12) to form a mould defining a closed cavity (10c) of constant volume in time, heating the mould (10) to a processing temperature, to melt the first, second, and third polymeric materials (1p-3p) and to expand the second polymer agent by activation of the blowing agent, cooling and removing the lid (12) to open the cavity and extracting the polymeric article. At least the second polymeric material (2p) includes at least 50 wt. % of recycled polymer in the form of shredded flakes.