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*8/1/2013
from 4/19/2012

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Patents with Abstracts

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5. Biodegradable Macromonomers

U.S. Patent 8,492,505 (July 23, 2013),”Branched Biodegradable Polymers, a Macromonomer, Processes for the Preparation of Same, and their Use,”
Jan Feijen, Zhiyuan Zhong, and Pieter Jelle Dijkstra (University of Twente, Enschede, Netherlands).

Branched biodegradable polymers are needed for medical and non-medical applications.  A bidogradable macromonomer is needed for preparing different biodegradable materials for specific applications.  Feijen, Zhong and Dijkstra developed branched biodegradable polymers by preparing a macromonomer by ring-opening polymerization of at least one cyclic ester, cyclic carbonate or cyclic carboxyanhydride with a branching agent and a catalyst followed by polycondensation of the macromonomer with other monomers by ring-opening polymerization to form the final material.

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4. 8,492,505 
Branched biodegradable polymers, a macromonomer, processes for the preparation of same, and their use 

Feijen, Zhong and Dijkstra of the University of Twente, Enschede, Netherlands, developed branched biodegradable polymers by (a) preparing a macromonomer by ring-opening polymerization of at least one cyclic ester, cyclic carbonate, and/or cyclic carboxyanhydride in the presence of a branching agent and optionally a catalyst; and (b) subsequent polycondensation of the macromonomer, to a process for the preparation of a macromonomer by ring-opening polymerization of at least one cyclic ester, carbonate and/or N-carboxyanhydride in the presence of a defined branching agent and optionally a catalyst. 

3. 8,431,662 
Polymacromonomer and process for production thereof

Polyolefins are of great interest in industry as they have many uses in many different areas. For example, polyolefins, such as polyethylene and polypropylene, are often used in everything from waxes and plasticizers to films and structural components. Of late many have been interested in modifying the architecture of such polyolefins in the hopes of obtaining new and better combinations of properties. One method of controlling polyolefin architecture is to select monomers that will impart specific characteristics or tailoring the monomers used. For example, several have tried to produce large "monomers" called "macromonomers" or "macromers" having amounts of vinyl, vinylidene or vinylene termination that can be polymerized with smaller olefins such as ethylene or propylene to impart long chain branching, structural properties, etc. to a polyolefin. Typically, vinyl macromonomers are found more useful or easier to use than vinylene or vinylidene macromonomers

Brant et al of Exxonmobile developed  a polymacromonomer consisting of a 0 to 20 wt % of a C2 to C12 comonomer with a vinyl termination of at least 70%.  The polymacromonomer has: a) a g value of less than 0.6, b) an Mw of greater than 30,000 g/mol, c) an Mn of greater than 20,000 g/mol, d) a branching index (g') vis of less than 0.5, e) less than 25% vinyl terminations, f) at least 70 wt % macromonomer, based upon the weight of the polymacromonomer, g) from 0 to 20 wt % aromatic containing monomer, based upon the weight of the polymacromonomer and h) optionally, a melting point of 50 C. or more.

2. 8,394,898 
In situ formation of hydroxy chain end functional polyolefins 

Hydroxy-terminated polymers, that is, polymers containing hydroxy end groups, are useful intermediates in the preparation of high-performance polymer products. Such intermediates can be useful, for example, in the production of fuel or lube oil additives, thermoplastic elastomers such as polyurethanes, poly(urethane-urea)s, or polyamides, network polymers, star branched polymers, and block copolymers. Thus, there is a need for hydroxyl-terminated polymers, as well as convenient methods of producing the same. Storey and Morgan of The University of Southern Mississippi, Hattiesburg, Mississippi, prepared telecheic polyisobutylene using a cationic initiator.  The initiator produces a quasiliving system which reacts with an acid to form the telechelic polymer.

1. 8,129,442 
Hydrophilic polysiloxane macromonomer, and production and use of the same
 
Ueyama, Ikawa and Iwata of CooperVision International Holding Company, Barbados, developed hydrophilic polysiloxane macromonomers containing polyoxyethylene as a hydrophilic side chains pendant to a polysiloxane main chain for imparting transparency, oxygen permeability, and hydrophilic properties to a contact lens is disclosed.  The properties of the material are controlled by regulating the length of the polysiloxane main chain, the length of the hydrophilic polyoxyethylene side chains, and the number of the side chains. (RDC 4/19/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

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Tel: 610 363 9920
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E-Mail: cornelrd@bee.net  

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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 4/19/2012.