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Star Copolymers
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Patent Abstracts

From 09/23/2014 through 6/27/2012

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Patents with Abstracts

4. 8,445,577 
 Amphiphilic multi-arm copolymers and nanomaterials derived therefrom

Lin and Pang of Ohio State University have eveloped amphiphilic multi-arm copolymers consisting of copolymer cores connected amphiphilic block copolymer arms.  Each block copolymer arm is substituted and includes at least one hydrophilic homopolymer subunit and at least one hydrophobic homopolymer subunit.  The core can be a cyclodextrin such as a beta-cyclodextrin (.beta.-CD).  Hydroxyl groups can be points of substitution leading to amphiphilic block copolymer arms.  The homopolymer subunits can include about 1 to 1,000,000 repeating units.  Any suitable polymerization method can be used including living polymerization, atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain-transfer (RAFT) polymerization, anionic polymerization, or coordination-insertion ring-opening polymerization.  [Star Copolymers, US Patent 8,445,577 (5/21/2013)]

3. 8,394,878 
Hyperbranched organic modifier, method of preparing thereof and organo-modified clay using the same 

Clay used in preparing polymer-clay nanocomposites has a layered-structure in which silicate plates are layered on a nanoscale by van der Waals' force. A polymer-clay nanocomposite makes the layered silicate structure exfoliated. This allows silicate to disperse uniformly on a nanoscale in polymer resins, so that the polymer resin can have better mechanical properties than conventional polymer resins and can achieve new properties such as gas shielding and thermal resistance that are not seen in conventional resins. However, the clay used in a nanocomposite is itself hydrophilic and it is mainly acquired by treating natural montmorillonite with a metal cation. Further, there are difficulties in exfoliation and dispersion of the layered-structure into hydrophobic polymer resins because strong van der Waals' force acts between layers of silicate plates.

Kim et al of Cheil Industries, South Korea, developed a hyperbranched polymer organic modifier which is stably dispersed in water and polar organic solvent. They reacted (a) a tertiary amine compound having at least two terminal hydroxyl groups with (b) at least one multifunctional monomer having at least two terminal functional groups capable of reacting with the hydroxyl groups.  The result is a hyperbranched organic modifier with a number average molecular weight of about 200 to about 30,000, about 5 to about 300 hydroxyl groups per polymer chain and about 0 to about 100 carbonyl groups of per polymer chain.  (RDC 4/3/2013)

2. 8,193,294 
Networks containing perfluorocarbon organosilicon hyperbranched polymers
 
Hu et al of the Michigan Molecular Institute, Michigan, developed hyperbranched copolymer networks containing hyperbranched copolymers that have perfluorocarbon and organosilicon entities that have high hydrophobicity, or high oleophobicity, or high thermal stability, or good adhesion to substrates, or any combinations thereof. This invention provides a further desirable combination of properties that include solubility before crosslinking, chemical resistance, and easy processibility. The copolymers may be crosslinked with a variety of crosslinking agents to give either rigid or elastomeric networks. (RDC 6/27/2012)

1. 8,193,286 
Acrylic star polymer
 
Matsumoto and Nakamura of Nippon Soda, Japan, producedd a star polymer having a controlled ratio of a weight average molecular weight of the star polymer to a number average molecular weight of the star polymer, by anionically polymerizing a (meth)acrylic ester having an alicyclic skeleton and a lactone ring in the presence of an anionic polymerization initiator to synthesize an arm polymer, reacting the arm polymer with a polyfunctional coupling agent, and reacting with an anionic polymerizable monomer. (RDC 6/27/2012)

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

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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 6/28/2012.