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Overview

The McMurry-reaction allows the coupling of 2 carbonyl groups under reductive conditions using low valent Ti forming an alkenylene group.The so formed double bond acts as a link between the repeating units.Several diketones were converted into unsaturated polymers by reductive coupling in different ethers.First results of the synthesis of some derivatives of the classes of polypropenylenes, polybutadienes, polypentenamers, polyhexenamers and polydodecenamers are described.Synthesis of such polymers via common polymerization or ROMP succeeds only in few cases.

Metallocene PE sealant layers for packaging films

Author: Ruhland, Reinhard ; Lund, K. ; Kaschel, G.

Sealing layers are especially important in supplying the characteristic features of a flexible multilayer film structure.PE-sealant layers constantly have to meet more difficult requirements.Lower seal initiation temperature and better hot-tack allow for higher packaging speed and therefore a more efficient food productionImproved secondary seal as well as higher puncture resistance assure better product safety and minimize the usage of packaging materials.A taste-and odorless packaging material as well as excellent optical properties are equally important to the food manufacturer.Sealant layers made out of polymers produced with the metallocene catalyst technol. contain such pos. properties.Therefore, modern co-extrusion technol. for blown- and cast film production is able to offer a wide variety of base webs and lid stocks in order to fulfill the manyfolded demands of the food packaging industry.

Cellulose esters

Author: Balser, Klaus ; Astheimer, Hans-Joachim ; Wandel, Martin ; Hoppe, Lutz ; Eicher, Theo ; Steinmeier, Hans

A review on the preparation, manufacture, structure, and properties of cellulose esters, with special emphasis on manufacture of cellulose acetate and cellulose acetate fibers.

100 Deals associated with Dow Wolff Cellulosics GmbH & Co. KG

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100 Translational Medicine associated with Dow Wolff Cellulosics GmbH & Co. KG

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