The invention relates to a foaming process using carbon dioxide solution, comprising: put a parison into the carbon dioxide solution for primary foaming, remove and put the parison into the carbon dioxide solution for secondary foaming to get the foam product. Compared with foaming process using high-pressure gas directly, the foaming process using polar liquid system can get a uniform foam structure with high foaming rate faster, and has good foaming effect for high crystalline polymers. To control the change of temperature and pressure after the introduction of carbon dioxide, the impact and penetration of carbon dioxide on the surface of the crosslinked material can be controlled first, and the solubility of carbon dioxide in the polar system can be improved by further increasing pressure and temperature, thereby promoting the formation of uniform foam structure with high foaming rate in the subsequent heat foaming process.

Disclosed are foam articles comprising a thermoplastic, closed-cell foam having at least a first surface and comprising: (i) thermoplastic polymer cell walls comprising at least about 0.5% by weight of ethylene furanoate moieties and optionally one or more co-monomer moieties; (ii) blowing agent contained in at least a portion of said closed cells; and a material different than said thermoplastic, closed-cell foam attached to and/or integral with at least a portion of said first foam surface.

Disclosed are foam articles comprising a thermoplastic, closed-cell foam having at least a first surface and comprising: (i) thermoplastic polymer cell walls comprising at least about 0.5% by weight of ethylene furanoate moieties and optionally one or more co-monomer moieties; (ii) blowing agent contained in at least a portion of said closed cells; and a material different than said thermoplastic, closed-cell foam attached to and/or integral with at least a portion of said first foam surface.

The invention relates to a modified geopolymer and a modified geopolymer composite comprising additive. The additive is preferably an athermanous additive. The modification is with one or more water-soluble compounds, the water-soluble compound is preferably selected from phosphorus compounds, nitrogen compounds, copper compounds, silver compounds, zinc compounds, tin compounds and magnesium compounds. Also, it relates to compositions which contain the modified geopolymer or modified geopolymer composite. The compositions preferably comprise vinyl aromatic polymer and are in the form of a foam.

The invention relates to a modified geopolymer and a modified geopolymer composite comprising additive. The additive is preferably an athermanous additive. The modification is with one or more water-soluble compounds, the water-soluble compound is preferably selected from phosphorus compounds, nitrogen compounds, copper compounds, silver compounds, zinc compounds, tin compounds and magnesium compounds. Also, it relates to compositions which contain the modified geopolymer or modified geopolymer composite. The compositions preferably comprise vinyl aromatic polymer and are in the form of a foam.

A resin sheet with a pressure-sensitive adhesive layer including the resin sheet. The resin sheet including a main surface A and a main surface B opposite to each other across a thickness “d”, where the resin sheet has a 50% compression load of 20 N/cm.sup.2 or less at 23±5° C. in a direction of the thickness “d”, which is measured in conformity with a method of measuring a compression hardness described in JIS K 6767:1999; where the resin sheet has a Poisson's ratio at 23° C. of 0.10 or less; and the resin sheet has a thickness recovery ratio of 40% or more when compressed by 20% in the direction of the thickness “d” at 23° C.

Provided are poly(3-hydroxyalkanoate) foam particles, which can give a foam molded article having good surface aspects and a low shrinkage ratio of a molding, and the foam molded article. The poly(3-hydroxyalkanoate) foam particles have at least two melting peaks on a DSC curve obtained by differential scanning calorimetry and in which a melting calorie (X) on a high temperature side is 0.1 to 20 J/g, a gel fraction (Y) is 20 to 75% by weight, and the melting calorie (X) and the gel fraction (Y) satisfy Formula: X+Y≥30.

Provided are poly(3-hydroxyalkanoate) foam particles in which a gel fraction of the whole foam particles is from 30 to 80% by weight and a difference in gel fraction between inside and outside of the foam particles is 25% by weight or less. Preferably, the foam particles are particles crosslinked by an organic peroxide. Preferably, the organic peroxide has a 1 hour half-life temperature of 114 to 124° C., contains a carbonate group, and is liquid at room temperature.

Provided are poly(3-hydroxyalkanoate) foam particles in which a gel fraction of the whole foam particles is from 30 to 80% by weight and a difference in gel fraction between inside and outside of the foam particles is 25% by weight or less. Preferably, the foam particles are particles crosslinked by an organic peroxide. Preferably, the organic peroxide has a 1 hour half-life temperature of 114 to 124° C., contains a carbonate group, and is liquid at room temperature.

The present invention relates to a foamed sintered polymeric material with improved mechanical properties and a process for the preparation thereof comprising the following steps: providing an expandable polymeric material in the form of granules, solubilizing with a time-varying pressure profile said one or more blowing agents in the expandable polymeric material, expanding said granules to form said expanded beads by instantly releasing the pressure or by pressure release and subsequent heating, and sintering together said expanded beads, preferably at a temperature higher than 30° C.