Abstract:
Disclosed is a thermoplastic resin foam which excels typically in strength, flexibility, cushioning properties, and strain recovery and is especially resistant to cell structure shrinkage caused by the restoring force of resin.The thermoplastic resin foam which is obtained by subjecting a thermoplastic resin composition containing a thermoplastic elastomer and an active-energy-ray-curable resin to foam molding to give a foamed structure, and irradiating the foamed structure with an active energy ray to allow the active-energy-ray-curable resin to form a cross-linked structure in the foamed structure. Also, the thermoplastic resin foam which is obtained by subjecting a thermoplastic resin composition containing a thermoplastic elastomer, an active-energy-ray-curable resin, and a thermal cross-linking agent to foam molding to give a foamed structure, irradiating the foamed structure with an active energy ray to allow the active-energy-ray-curable resin to form a cross-linked structure in the foamed structure, and heating the resulting foamed structure bearing the cross-linked structure to thereby allow the thermal cross-linking agent to form another cross-linked structure in the foamed structure.
Abstract:
Disclosed herein are methods for making expanded foamed polymeric panels from solid monolithic semi-crystalline thermoplastic material sheets having a first thickness, density, and volume. In one embodiment, the method comprises: absorbing an effective amount of a plasticizing gas into the semi-crystalline thermoplastic material sheet to yield a reversibly plasticized semi-crystalline thermoplastic material sheet that is differentially impregnated with the plasticizing gas to define a non-uniform gas concentration gradient across the initial first thickness; and heating the plasticized semi-crystalline thermoplastic sheet to yield the foamed polymeric panel, wherein the foamed polymeric panel comprises (1) a second thickness that is at least about three and half times greater than the first initial thickness, and (2) a non-uniform second density level that is less than the first density level. In another embodiment, the foamed polymeric panel also comprises (3) a second volume that is at least 5 times greater than the first volume.
Abstract:
Closed cell silicone foams are formed by subjecting a silicone base to an inert gas at an elevated pressure, preferably after a pre-curing step, reducing the pressure to allow the base to expand to produce closed cell silicone foam and curing this expanded foam at an elevated temperature.
Abstract:
A styrene-modified polypropylene type resin particle of the present invention includes: a polypropylene type resin and a polystyrene type resin, wherein the polystyrene type resin is included at 30 parts by weight or more but less than 600 parts by weight per 100 parts by weight of the polypropylene type resin, and polystyrene type resin particles having a longitudinal diameter of 5 μm or less are dispersed in the polypropylene type resin.
Abstract:
A nano-cellular polymer foam is disclosed, which has an average pore size from about 10 nanometers to about 500 nanometers; and a foam density that is from about 1 percent to about 50 percent of the bulk density of the material of the nano-cellular foam.
Abstract:
This invention provides packages and containers produced by a solid state method for the manufacture of foamed polymeric material. The packages are suitable for pre-cooking or sterilization, insulated transport, cooking vessel, reheating, and storage of food. The gas impregnated thermoforming (GIT) process includes interleaving an article of raw polymeric material with a gas channeling means; exposing the article to a non-reacting gas at elevated pressure to achieve a desired concentration of gas within the polymer, thereby forming a partially gas-saturated article, separating it from the gas channeling means, then decompressing, foaming and forming it at a temperature below the material's melt temperature; and finally trimming it to produce a finished foamed polymeric material and recyclable scrap solid state process foamed polymer.
Abstract:
A first polymer (preferably in granular form) is exposed to a gas at a pressure higher than atmospheric pressure to introduce the gas into the polymer. This occurs at a temperature from the glass transition temperature to the melting temperature when the first polymer is crystalline or semi-crystalline in nature, or at a temperature below the glass transition temperature when the first polymer is amorphous in nature. Optionally, the gas-laden polymer may then be mixed with a second polymer. The polymer is then melted to produce a foamed article.
Abstract:
A porous, starch-based pigment and filler product, which comprises a foam, which contains foam bubbles, the average size of which is less than approximately 10 micrometres, and a method of manufacturing it. From the starch, microporous foam can be prepared, which can be stabilized to microcapsules. By means of a suitable choice of the inner diameter and the wall thickness of these capsules the light scattering ability of the material is maximized, which means that the structure has good opacity properties. Good strength properties in relation to the capsule mass is also characteristic of the micro capsule structure.
Abstract:
This invention provides packages and containers produced by a solid state method for the manufacture of foamed polymeric material. The packages are suitable for pre-cooking or sterilization, insulated transport, cooking vessel, reheating, and storage of food. The gas impregnated thermoforming (GIT) process includes interleaving an article of raw polymeric material with a gas channeling means; exposing the article to a non-reacting gas at elevated pressure to achieve a desired concentration of gas within the polymer, thereby forming a partially gas-saturated article, separating it from the gas channeling means, then decompressing, foaming and forming it at a temperature below the material's melt temperature; and finally trimming it to produce a finished foamed polymeric material and recycleable scrap solid state process foamed polymer.
Abstract:
The invention is directed to a process for preparing porous polymer materials by a combination of gas foaming and particulate leaching steps. The invention is also directed to porous polymer material prepared by the process, particularly having a characteristic interconnected pore structure, and to methods for using such porous polymer material, particularly for tissue engineering.