From 07/10/2014 through 5/17/2012
Patents with Abstracts
3. Free-Radical Scavengers
U.S. Patent 8,567,412 (October 29, 2013), “Use of Polyphenol Compounds or Derivatives thereof as Free-Radical Scavengers in Cigarette Filters,” Iman Emami (Biosyntec, Paris, France).
Free radical scavengers can remove dangerous and toxic materials from food as well as air. Many polyphenol compounds are free readical scavengers known for their beneficial properties in fields as varied as cardiovascular diseases, viral infections or inflammation. Emami discovered that polyphenols in a cigarette filter efficiently remove free radicals of cytotoxic molecules of cigarette smoke. These filters are impregnated by an extract of a rosemary plant containing carnosol, rosmanol, rosmadial, carnosic acid, genkwanin and rosmarinic acid. The extract is obtained by alcohol or aqueous extraction followed by supercritical carbon dioxide extraction. 0.01 g of the extract of rosemary incorporated into a cigarette filter reduces the level of cytotoxic free radicals in the cigarette smoke by more than 70%.
Formaldehyde scavenger and wood material using same
Fujii et al of Idemitsu Technofine Co., Ltd., Japan, developed a formaldehyde scavenger capable of providing excellent formaldehyde scavenging performance without discoloring a wood material and not reemitting formaldehyde. The formaldehyde scavenger contains urea, ammonium phosphate monobasic and ammonium phosphate dibasic. The formaldehyde scavenger contains urea, ammonium phosphate monobasic and ammonium phosphate dibasic preferably in a weight ratio of urea/ammonium phosphate monobasic/ammonium phosphate dibasic in the range of 5 to 45/0.5 to 15/1 to 20, and further preferably in a weight ratio of urea/ammonium phosphate monobasic/ammonium phosphate dibasic in the range of 10 to 35/1 to 10/2 to 15. The wood material is prepared by applying the formaldehyde scavenger thereto. The formaldehyde scavenger is preferably applied in the range of 1 to 50 g/m.sup.2 by
efficiency of tannin as a formaldehyde scavenger chemical in medium density
(2487-2491) Composites Part B: Engineering 43 #5 (2012)
Boran et al Karadeniz Technical University, Turkey, determined the effect of tannin content of urea formaldehyde (UF) resin on the panel properties of medium density fiberboard (MDF). Tannin extracted from the bark of white oak (Quercus alba) was added to UF resin at different ratios (based on the resin) to decrease the free formaldehyde content of MDF panels in this study. It was determined that free formaldehyde values of MDF panels decreased when the ratio of tannin content in UF resin increased. However, the modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond strength (IB) of these panels were a little lower, and the thickness swelling (TS) (24 h) and water absorption (WA) (24 h) values were a little higher compared to the control MDF panels. (RDC 5/17/2012)
Roger D. Corneliussen
Maro Polymer Links
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Copyright 2012 by Roger D. Corneliussen.
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** Date of latest addition; date of first entry is 5/17/2012.