Provided in the present disclosure are a core flooring layer of a light-foamed SPC floor and a light-foamed SPC floor. Based on the total weight of the core flooring, the core flooring of the present disclosure contains 65.0?75.0 wt % of calcium carbonate, 18.0?25.0 wt % of polyvinyl chloride resin, 2.2?3.0 wt % of a foaming regulator, 2.5?3.3 wt % of a stabilizer, 0.10?0.20 wt % of a plasticizer, 0.10?0.15 wt % of an external lubricant, 0.1?0.40 wt % of an ADC foaming agent, and 0.5?1.0 wt % of an NC foaming agent. The present disclosure can greatly reduce the density of a SPC floor while improving the static bending strength, flexural elastic modulus and peeling strength, and reducing heating warpage.

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.

An object of the present invention is to provide an expansion ratio improver for a polymer material that can impart an excellent expansion ratio to polymer materials. Another object of the present invention is to provide a resin composition for obtaining a foam having a high expansion ratio and fine (dense) cells. An expansion ratio improver for a polymer material, comprising at least one member selected from the group consisting of a pyrazolone-based compound and a salt of the compound. A resin composition comprising component (a): polyethylene, component (b): a chemical foaming agent, and component (c): a pyrazolone-based compound, the resin composition containing 0.1 parts by mass to 50 parts by mass of component (b) and 0.1 parts by mass to 50 parts by mass of component (c) based on 100 parts by mass of component (a).

A foamable adhesive system is provided which can achieve necessary adhesion to an oily surface and which is not tacky to the touch once applied to the surface and has a melt viscosity in the bake phase high enough to retain its shape and adhesion to the substrate and in addition a melt viscosity sufficiently high to retain gas bubbles formed by the decomposition of the blowing agent and which also retains its shape and structure once formed by use of a polymer system containing a thixotropic filler and a two compartment (component) cross linking system.

A copolymer may include ethylene and vinyl acetate, in which the ethylene is at least partially obtained from a renewable source of carbon. Embodiments may also be directed to curable polymer compositions, expandable polymer compositions, articles, cured articles, and expanded articles formed from or including such copolymers of ethylene and vinyl acetate, in which the ethylene is at least partially obtained from a renewable source of carbon. A process for producing an ethylene vinyl acetate copolymer may include

A push-in earplug including an elongate core and outer layer is disclosed. The outer layer includes a sound attenuating portion having a first average density and a stem portion having a second average density, and the second average density is greater than the first average density.

A polymer that is capable of affording a heat storage material superior in humidity permeability and shape retention after phase transition and that is superior in molding processability is provided. The polymer includes constitutional units (A) derived from ethylene, constitutional units (B) represented by a specified formula, and optionally includes constitutional units (C) represented by another specified formula. Where the total number of the units (A), the units (B), and the units (C) is 100%, the number of the units (A) accounts for 70% to 99%, the total number of the units (B) and the units (C) accounts for 1% by weight to 30% by weight. Where the total number of the units (B) and the units (C) is 100%, the number of the units (B) accounts for 1% to 100% and the number of the units (C) accounts for 0% to 99%.

The present invention provides a phase transition material fluid and a proppant formed therefrom, wherein the components for preparing the phase transition material fluid comprise in percentages by mass: a supramolecular building block 10 to 60 wt %, a supramolecular functional unit 20 to 50 wt %, a dispersant 0.1 to 2 wt %, an inorganic co-builder 0.1 to 1 wt %, an initiator 0.1 to 1 wt %, the balance being a solvent. The supramolecular building block comprises a melamine-based substance and/or a triazine-based substance; the supramolecular functional unit comprises a dicyclopentadiene resin; and the dispersant includes a hydroxyl-bearing polysaccharide substance and a surfactant. After the phase transition material fluid enters the reservoir, it may form a solid substance to prop the fracture under the action of supramolecular chemistry and physics.

A 2-step processing method to form a partly cross-linked polyurethane (PU) comprising foam having densities below 600 kg/m.sup.3, preferably in the range 20-300 kg/m.sup.3, said method comprising: A first processing which comprises at least following steps: a) providing a reactive mixture comprising an isocyanate composition comprising at least one isocyanate compound, an isocyanate-reactive composition comprising at least one isocyanate reactive compound, a crosslinking agent and a blowing agent composition comprising at least a heat activatable blowing agent which is heat activatable to achieve blowing at an activation temperature T.sub.activate, and b) allowing the reactive mixture to polymerize, optionally using a shape or mold, at a process temperature T.sub.process wherein T.sub.process<T.sub.activate and T.sub.process<T.sub.melt to form a polyurethane comprising material having a melting temperature T.sub.melt and which is solid at room temperature, and then A second processing which comprises at least following steps: c) placing the polyurethane comprising material in an autoclave, pressure vessel or pressurizable mold, d) subjecting the polyurethane comprising material to a temperature sufficient to soften the polymer material (T.sub.softening) wherein T.sub.softening?T.sub.activate in combination with an elevated pressure P.sub.1 wherein P.sub.1 is higher than atmospheric pressure (P.sub.atm), and then subsequently e) subjecting the polyurethane comprising material to a pressure reduction which is sufficient to achieve expansion (foaming) and to obtain the partly cross-linked polyurethane comprising foam

The invention relates to a structural adhesive formulation, which is heat activatable at a heat activation temperature; meltable without heat activation at an application temperature above its melting point and below the heat activation temperature; and solid at ambient temperature; wherein upon heat activation the structural adhesive formulation is capable of expansion with a volumetric expansion of up to about 250 vol.-%; wherein the heat activatable structural adhesive formulation comprises (a) an epoxy resin component; (b) an adhesion promoter component; (c) a cross-linking component; (d) a blowing component; (e) optionally, an impact modifier component; (f) optionally, a thixotropic filler component; and (g) optionally, a non-thixotropic filler component. The structural adhesive formulation is particularly useful for application by means of a hot melt applicator, preferably a hand held hot melt gun.