Patent number 8563621 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present disclosure relates to a blowing agent in the form of a solid mixture of an inorganic powder, more particularly nanoparticles of an inorganic carbonate, and an acid. The acid is capable of being liquefied by heating to be reactive with the carbonate to release carbon dioxide that is useful as a blowing agent in all types of organic foams. The solid mixture, optionally pelletized in a suitable polymer carrier, is useful as a heat-activated blowing agent additive in polymer compositions.
"Lower cost bicarbonates which generate CO.sub.2 are employed as blowing agents, but the results achieved during their thermal decomposition are relatively unpredictable, and therefore they are not usually employed to produce high quality polymer foam parts having evenly distributed porosity and aesthetic appeal.
"A wide variety of compounding and blending methods are well-known and commonly used in the art and most may be adapted to mix and compound with the components of foamable polyolefin or polystyrene formulations disclosed herein. Modifying components that are not thermally sensitive, whether in powder, pellet, or other suitable form, may be mixed and melt compounded using a high shear mixer, e.g., a twin-screw extruder at temperatures effective to render the resinous components molten and obtain a desirably uniform blend. Thermally sensitive components of the formulations, including blowing agents, may be physically mixed with the resin in powder or pellet form using conventional dry-blending methods just prior to feeding the mixture to the extruder.
"In a typical method for combining inorganic powder blowing agents and polymers, the powder and polymer are dropped through a feed tube into the feed barrel near the starting end of an extruder or into a 'side stuffer' part-way along the extruder's length. The combined powders and polymers are compounded and extruded. In another typical method for combining inorganic powders and polymers, the inorganic powder can be dropped with the polymer into the cavity of a rotational blender such as a Banbury.RTM. mixer. The relative quantities of the polymer(s), blowing agent(s) and other additives, as well as the temperature and the manner in which pressure is reduced, will tend to affect the qualities and properties of the resulting foam product.
"Conventional blowing agents produce foams that contain cells that have a negative impact upon the structural strength and appearance of the foamed product. It is desirable to produce thermoformed foamed products that are aesthetically pleasing, have a high degree of porosity and a smooth surface, and are lightweight while maintaining structural strength. Such products would be environmentally and ecologically desirable as these products require a comparatively reduced amount of resin in the production of the finished product."
In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventor's summary information for this patent: "The present invention relates to a mixture of nanoparticles of inorganic, preferably an alkaline earth metal carbonate and a reactive acid; and its use as a blowing agent in the production of microcellular foams having outstanding structural and ecological properties. The reactive acid is preferably solid and upon addition to a foamable polymer is heated above the melting point of the acid, liquefies and reacts with the nanosized alkaline earth metal carbonate to release the carbon dioxide to act as a blowing agent. The blowing agent can be used as a singular component additive or as a pelletized additive admixed in any suitable polymeric carrier, such as polyethylene or other polymers that are compatible when blended with the thermoplastic or thermoset material to be foamed."
URL and more information on this patent, see: Lapierre, Renee M.. Blowing Agents Formed from Nanoparticles of Carbonates. U.S. Patent Number 8563621, filed
Keywords for this news article include: Anions, Alkalies, Chemicals, Chemistry, Carbonates, Nanoparticle, Carbonic Acid, Carbon Dioxide, Nanotechnology,
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC
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