Maro Publications

Antioxidants

Patents with Abstracts

*10/25/2012

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Patents with Abstracts

5. 8,288,460 
Derivatives of native lignin from hardwood feedstocks
 
Balakshin et al of Lignol Innovations Ltd., California, extracted  hardwood lignin derivatives having an aliphatic hydroxyl content of from about 5.2 mmol/g to about 7 mmol/g lignin.  The lignin derivatives have a desired antioxidant activity characterized by the normalized radical scavenging index (RSI). This material can be used as antioxidant in polymeric materials.  (RDC 11/1/2012)

4. 8,287,765 
Systems and compositions for color stabilization of polymer
 
DeMassa of R.T. Vanderbilt Company, Inc., Connecticut, developed a three component antioxidant blend for extending color and clarity of a thermoplastic polymer. The antioxidant blend includes a zinc dithiocarbamate, a phenolic and a thioether with a weight ratio range of about 1-2:1-2:1-2. A loading level of the antioxidant blend is from about 0.01 wt. % to about 1 wt. % of the systems and compositions. (RDC 10/24/2012)

3. 8,258,214 
Polymers with low gel content and enhanced gas-fading
 
Zahalka of Chemtura Corporation, Connecticut, developed a polymer stabilizing composition consisting of a sterically hindered phenol and a phosphite that provides low gel content and enhanced resistance to gas-fading. The stabilizer composition is particular useful for stabilizing polyethylene homopolymers and copolymers, such as linear low density polyethylenes produced from metallocene catalyst. The sterically hindered phenol is, for example, selected from the group consisting of 1,3,5-tris-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 1,3,5-tris-(3,5-dicyclohexyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-Triazine-2,4,6-(- 1H,3H,5H)-trione, and 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene. (RDC 9/19/2012)

2. 8,242,230 
Macromolecular antioxidants based on sterically hindered phenols and phosphites
 
Cholli and Kumar of Polnox, Massachusetts, developed sterically hindered phenol and phosphite based polymers as antioxidants in a wide range of materials including, but not limited to, food, plastics, elastomers, composites and petroleum based products.  These polyemrs generally have higher oxidative induction time, higher thermal stability and lower change of Melt flow or viscosity than commercially available antioxidants  Without wishing to be bound by theory it is believed that the enhanced molecular activity comes from the synergistic chemistry between the two main integral components (phenolic and phosphite components) of these macromolecular antioxidants. (RDC 8/30/2012)

1. 8,178,017 
Method for producing granular composition
 
Awa, Arai and Shinomiya of Sumitomo Chemical Company, Japan, produced a granular antioxidant by stirring and granulating a mixture containing 3 to 80 parts by weight of a phenolic compound and 3 to 20 parts by weight of a binder and cracking the granular agglomerate at a temperature of not lower than 25.degree. C. and lower than10.degree. C. lower than the melting point of the binder, through a cracking machine equipped with a separation mechanism capable of recovering a granule having a particle size not more than 5 mm, and a cracking mechanism, to obtain a granule. (RDC 5/24/2012)

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 5/24/2012.