Maro Publications

Crosslinking Agents

Patent Abstracts

*5/31/2012

Maro Topics

* Date items entered.

Additives

Compounding

Crosslinking

Epoxy Crosslinking Agents

Reactions

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Patent Abstracts

6. 8,426,528 
Preparation of crosslinked polymers containing biomass derived materials 

Andrews, Figuly and  Chenault; of DuPont developed crosslinking agents from an aldaric acid, aldarolactone, aldarodilactone, aldarolactone ester, aldaric acid monoester, aldaric acid diester, or aldaramide, or salts thereof, for  polyallylamine, polyallylamine hydrochloride, branched polyethyleneimine, branched polyethyleneimine hydrochloride, poly(acryloyl chloride), poly(methacryloyl chloride), poly[N-(.omega.-aminoalkyl)acrylamide], polyglycosamine, carboxymethylchitosan, chitosan and chitosan hydrochloride.

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5. 8,404,758 
Stress relaxation in crosslinked polymers 

Bowman and Scott of the University of Colorado, Colorado, induced  reversible chain cleavage of polymer chains in a crosslinked polymeric material.  Reversible cleavage of the polymer backbone is capable of relieving stress in the polymeric material as the bonds reform in a less stressed state.  Reversible cleavage of the polymer backbone is enabled by incorporation of "reversible chain cleavage" groups or functionalities into the polymer backbone.  a reversible chain cleavage group is capable of both breaking and forming in-chain bonds. In an embodiment, the reversible chain cleavage group is a chain transfer group which undergoes addition-fragmentation type chain transfer.  Suitable addition-fragmentation functionalities or agents for use in the invention include conventional reversible addition-fragmentation chain transfer (RAFT) agents, allyl sulfides, dithiocarbamates, trithiocarbonates and thiuram disulfides.

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4. 8,403,904 
Superabsorbent polymer having a capacity increase 

Tian, Bergman, Jr. and Shi of Evonik Stockhausen, LLC., North Carolina, developed a particulate superabsorbent polymer consisting of a monomer and an internal crosslinker agent with a Centrifuge Retention Capacity Increase of 2 g/g.  The internal crosslinker agent is a silane compound with one vinyl group or allyl group attached to a silicon atom and at least one Si--O bond.

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3. 8,211,330 
Latent curing agent for epoxy resin and method for manufacturing the same
 
Masuko of Sony, Japan, developed a latent epoxy resin curing agent which can be manufactured without using an amphiphilic polymer compound requiring a painful trial and error selection process, showing excellent solvent resistance and low-temperature fast-curing ability. It contains an imidazole-based compound as a main component. (RDC 7/5/2012)

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2. 8,133,436 
Polyethylene cross-linked with an anthocyanin
 
He et al of Howmedica Osteonics Corp, New Jersey developed  an ultrahigh molecular weight polyethylene (UHMWPE) with dispersed anthocyanin for implants, where the implants have been machined out of UHMWPE blocks or extruded rods.  The implant is then exposed to gamma. ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear.  The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is then evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135.degree. C.-250.degree. C. and pressures in a range of approximately 2-70 MPa. Medical implants are made from the blocks. (RDC 4/25/2012)

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1. 8,129,449 
Crosslinking systems for hydroxyl polymers
 
Heinzman et al of Procter & Gamble, Ohio, developed crosslinking systems for hydroxyl polymers such as starh and cellulose based on ureas, thioureas, guanidines, diamides and dicarbamates crosslinking agents, crosslinking facilitators such as acetic acid or metal salts and plasticizers including glucose.  (RDC 4/19/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
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.