A composite article comprises an article presenting a surface and a thermally expandable composition disposed on the surface of the article. The thermally expandable composition comprises (a) from about 35 to about 65 percent by weight of a polyolefin resin; (b) from about 2 to about 15 percent by weight of a thermoplastic resin; (c) from about 1 to about 6 percent by weight of a curing agent suitable for cross-linking the polyolefin resin (a); (d) from about 15 to about 45 percent by weight of filler; and (e) from about 1 to about 10 percent by weight of a chemical blowing agent which is activated at an activation temperature, each based on the total weight of the thermally expandable composition. Methods of preparing and using the composite article, and an assembly formed from the composite article, are also disclosed.

A flexible material for thermal and acoustical insulation comprising an expanded polymer (blend) based on at least one elastomer, wherein expansion is achieved by decomposition of a mixture of at least two chemical blowing agents, comprising the exothermic chemical blowing agent 4,4-Oxybis(benzenesulfonyl hydrazide) (OBSH) and at least one endothermic blowing agent.

A recyclable crosslinked polymeric foam includes a reaction product of 0.1 to 10 parts by weight of a crosslinking agent and 0.1 to 5 parts by weight of a radical initiator, based on 100 parts by weight of a polymeric material. The crosslinking agent is represented by the following formula: ##STR00001##
wherein R is an alkylene group having 2 to 10 carbon atoms, an arylene group having 6 to 18 carbon atoms, or a cycloalkylene group having 6 to 18 carbon atoms.

The preparation method of superabsorbent polymer according to the present invention can increase suction power without degradation of other properties of superabsorbent polymer, and thus, the prepared superabsorbent polymer may be usefully used as material of hygienic goods such as a diaper.

A composition for an expandable sealant including at least one polymeric material selected from the group consisting of low density polyethylenes (LDPE), linear low density polyethylenes (LLPDE), ethylene vinyl acetate (EVA), ethylene methacrylate (EMA), and ethylene-butyl acrylate (EnBA); and a chemical blowing agent, wherein the composition is substantially free of a cross-linking agent.

The gas generating agent of the present invention comprises an oxalic acid salt of an aminoguanidine compound represented by general formula (1) below.

##STR00001##

A composition for low density, ultrathin, and inorganic films, comprising a mixture of 70-82% of calcium carbonate by weight, 10-15% of linear polyethylene by weight, 1-5% of stearic acid by weight, 0.40-0.80% of aluminate by weight, 0.20-0.80% of titanic acid ester by weight, 0.4-3.0% of modified polyethoxylated silicone emulsion by weight, 0.05-0.5% of foaming agent by weight, and 0.01-0.1% of foaming agent accelerator by weight. The inorganic of the present invention is reduced in thickness, light in weight, easy to degrade, high tensile and high tear strength, toxicity-free, high temperature resistance, and low prices, so as to fulfill the requirement of producing the mulch, trash bags, shopping bags, and package bags.

A composition for low density, ultrathin, and inorganic films, comprising a mixture of 70-82% of calcium carbonate by weight, 10-15% of linear polyethylene by weight, 1-5% of stearic acid by weight, 0.40-0.80% of aluminate by weight, 0.20-0.80% of titanic acid ester by weight, 0.4-3.0% of modified polyethoxylated silicone emulsion by weight, 0.05-0.5% of foaming agent by weight, and 0.01-0.1% of foaming agent accelerator by weight. The inorganic of the present invention is reduced in thickness, light in weight, easy to degrade, high tensile and high tear strength, toxicity-free, high temperature resistance, and low prices, so as to fulfill the requirement of producing the mulch, trash bags, shopping bags, and package bags.

A composition for low density, ultrathin, and inorganic films, comprising a mixture of 70-82% of calcium carbonate by weight, 10-15% of linear polyethylene by weight, 1-5% of stearic acid by weight, 0.40-0.80% of aluminate by weight, 0.20-0.80% of titanic acid ester by weight, 0.4-3.0% of modified polyethoxylated silicone emulsion by weight, 0.05-0.5% of foaming agent by weight, and 0.01-0.1% of foaming agent accelerator by weight. The inorganic of the present invention is reduced in thickness, light in weight, easy to degrade, high tensile and high tear strength, toxicity-free, high temperature resistance, and low prices, so as to fulfill the requirement of producing the mulch, trash bags, shopping bags, and package bags.

Provided is a foaming curable composition containing a heat-curable elastomer (A), a chemical foaming agent (B), and expandable particles (C) having a shell and an encapsulated component, wherein the chemical foaming agent (B) contains a hydrazine-based foaming agent (B1), and the peak foaming temperature of the chemical foaming agent (B) is 5 C. to 50 C. higher than the peak expansion temperature of the expandable particles (C). This novel foaming curable composition has good foaming and adhesive properties, as well as good properties after standing uncured.