Disclosed is an extruded non-crosslinked polyethylene foam containing a metallocene polyethylene, a density of 0.35 g/cc or less, and a closed cell content higher than 70%, methods of making the extruded non-crosslinked polyethylene foam and articles containing the extruded non-crosslinked polyethylene foam.

A foamable composition including a polypropylene-based copolymer and a polyolefin is disclosed. The composition can be used to make a stiff foam with a high closed-cell content. Methods for producing the composition and the foam are provided.

The presently disclosed subject matter is directed to a method of making a foam, specifically, the development of isocyanate-free foams using at least one unsaturated polyester. The at least one unsaturated polyester is a reaction product of at least one unsaturated cyclic anhydride, dicyclopentadiene, and at least one polyol. The disclosed formulation further comprises at least one reactive diluent and at least one initiator. The disclosed formulations are cured by a free radical mechanism.

Disclosed herein is a foamed composition comprising 55 to 98 wt. % of polyamide, and 2 to 45 wt. % of innomer comprising a zinc neutralized ethylene acid copolymer. The zinc neutralized ethylene acid copolymer is the polymerized reaction product of ethylene monomer, monocarboxylic acid monomer, and unsaturated dicarboxylic acid monomer, and 30 to 70 mole percent of total acid units of the ionomer are neutralized.

A recycled PET foam material and a manufacturing method thereof are characterized in that a recycled material can be used. The manufacturing method includes the following steps: uniformly mixing PET resin, chain extender, antioxidant, flame retardant and heat stabilizer, and then mixing with a twin-screw extruder to obtain a foam PET resin. The PET foaming material obtained is a material having the advantages of light weight, large rigidity, high specific strength, good electrical insulation, good sound insulation and the like, low raw material cost, simple manufacturing process and environmental protection.

The invention refers to a method for producing expanded polymer pellets, which comprises the following steps: melting a polymer comprising a polyamide; adding at least one blowing agent; expanding the melt through at least one die for producing an expanded polymer; and pelletizing the expanded polymer. The invention further concerns polymer pellets produced with the method as well as their use, e.g. for the production of cushioning elements for sports apparel, such as for producing soles or parts of soles of sports shoes. A further aspect of the invention concerns a method for the manufacture of molded components, comprising loading pellets of an expanded to polymer material into a mold, and connecting the pellets by providing heat energy, wherein the expanded polymer material of the pellets or beads comprises a chain extender. The molded components may be used in broad ranges of application.

A mixture contains at least one amino-regulated polyether block amide (PEBA) and at least one poly(meth)acrylate selected from poly(meth)acrylimides, polyalkyl(meth)acrylates, and mixtures thereof. The mass ratio of PEBA to poly(meth)acrylate is 95:5 to 60:40. The polyalkyl(meth)acrylate contains 80% by weight to 99% by weight of methyl methacrylate (MMA) units and 1% by weight to 20% by weight of C1-C10-alkyl acrylate units, based on the total weight of polyalkyl(meth)acrylate. The mixture can be processed to give foamed mouldings. The mouldings can be used in footwear soles, stud material, insulation or insulating material, damping components, lightweight components, or in a sandwich structure.

Disclosed are a hydrogenated styrene/conjugated diolefin copolymer, a foaming material thereof, and application thereof. The copolymer contains a styrene structure unit and a hydrogenated conjugated diolefin structure unit; by taking the total content of the copolymer as a reference, the content of the styrene structure unit is 15-50 wt %, the content of 1,2-polymerization structure unit in the hydrogenated conjugated diolefin structure unit is 8-32%, the degree of randomness of the styrene structure unit in the hydrogenated conjugated diolefin structure unit is 30-80%, and the degree of hydrogenation of conjugated diolefin in the copolymer is 85-100%. The tensile strength at break of the hydrogenated styrene/conjugated diolefin copolymer is 30-60 MPa, the elongation at break is 300-600%, and the hardness (Shore A) is 70-98. Moreover, a foaming body having excellent performance including more than 60% rebound and less than 30% compression deformation can be manufactured by using a supercritical carbon dioxide foaming process.

Disclosed are such co-polymers of vinylidene substituted aromatic monomers and unsaturated compounds containing nucleophilic groups chain extended by a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds having pendant electrophilic groups which copolymerize with the one or more vinylidene aromatic monomers. Disclosed are compositions comprising vinylidene substituted aromatic monomers and unsaturated compounds containing nucleophilic groups and a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds having pendant electrophilic groups, which may optionally, contain salts of alkaline earth metals, alkali metals, transition metals, post transition metals or metalloids. Disclosed are methods of preparing such chain-extended and/or branched copolymers.

Disclosed is a low-temperature supercritical foaming process, comprising the following steps: (1) bringing a polyolefin material or a thermoplastic elastomer material into contact with at least one inert gas in a reactor at a pressure higher than atmospheric pressure to drive the gas into the material, the pressure holding temperature of the polyolefin material or thermoplastic elastomer material being lower than the melting temperature of the material by 5-40° C.; (2) reducing the pressure to expand the material so as to produce a primary foamed material, and taking out the primary foamed material; and (3) taking out the primary foamed material and putting same into a tunnel furnace for secondary foaming, the temperature of the tunnel furnace being higher than the melting temperature of the material. Compared with the prior art, the present invention features high production efficiency, energy saving, and improvement of the reactor utilization rate.