Celanese Emulsions Gmbh

Celanese Sales Germany Gmbh

Lummus Novolen Technology Gmbh

Stefan Nogai

Martin Jakob

Andreas Winter

Yvonne Denkwitz

Oliver Schuster

Alistair McLennan

A process for the polymerization of propylene is disclosed. The process may include contacting, in a gas phase polymerization reactor, propylene and optionally one or more comonomers with a catalyst system comprising a Ziegler-Natta catalyst and an external electron donor system comprising di(bicyclo[2.2.1]heptan-2-yl)dimethoxysilane.

Sterically demanding dialkokxydialkylsilanes as external donors for Ziegler catalysts for the polymerization of propylene

A copolymer dispersion is described comprising a copolymer derived from a monomer mixture comprising: (a) 88.5 to 94% by weight of at least one vinyl ester of a saturated carboxylic acid; (b) 5 to 10.5% by weight of ethylene; (c) 0.5 to 5% by weight of at least one ethylenically unsaturated acid and/or an anhydride thereof and/or a salt thereof; and (d) 0.5 to 5% by weight of at least one ethylenically unsaturated monomer having at least one crosslinkable functional unit. The weight ratio of vinylester units to ethylene units in the copolymer is between 89:11 and 94:6 and the dispersion is stabilized with at least 1% by weight of an emulsifier, wherein the amounts of monomers and emulsifier refer to the total amount of monomers in the copolymer.

Polymer dispersions and their use in pigmented coating compositions

The invention relates to novel cross-linkable monomers that may be polymerized with ethylenically unsaturated comonomers to form cross-linkable copolymers. Said copolymers may particularly be used in the form of aqueous dispersions as formaldehyde-free adhesives or as coatings with good water resistance. The cross-linkable monomer is a compound in acid or salt form comprising an anion of the formula (I) and one or more cations for producing electrical neutrality, where Rand Rrepresent, independently of one another, hydrogen alkyl, cycloalkyl, aryl, aralkyl, &#x2014;COOR, &#x2014;COOcator &#x2014;CON(RR), Rand Rrepresent, independently of one another, hydrogen, alkyl, or aryl, catrepresents a monovalent cation, and one of the groups Ror Rmay also represent a group &#x2014;X&#x2014;R&#x2014;CR(OH)(SO&#x2014;), wherein X, R, and Rassume one of the meanings listed below, Rrepresents hydrogen, alkyl, or aryl, X is selected from the group of direct C&#x2014;C bond, &#x2014;O&#x2014;, &#x2014;CH&#x2014;O&#x2014;, &#x2014;CH&#x2014;NR&#x2014;, &#x2014;COO&#x2014; or &#x2014;CONR&#x2014;, Rrepresents hydrogen, alkyl, or aryl, Rrepresents alkylene, polyoxyalkylene, cycloalkylene, or arylene, and Rrepresents hydrogen, alkyl, cycloalkyl, or aryl.

Cross-linkable monomers and polymers and the use thereof

The invention relates to novel cross-linkable monomers that may be polymerized with ethylenically unsaturated comonomers to form cross-linkable copolymers. Said copolymers may particularly be used in the form of aqueous dispersions as formaldehyde-free adhesives or as coatings with good water resistance. The cross-linkable monomer is a compound in acid or salt form comprising an anion of the formula (I) and one or more cations for producing electrical neutrality, where Rand Rrepresent, independently of one another, hydrogen alkyl, cycloalkyl, aryl, aralkyl, &#x2014;COOR, &#x2014;COOcator &#x2014;CON(RR), Rand Rrepresent, independently of one another, hydrogen, alkyl, or aryl, catrepresents a monovalent cation, and one of the groups Ror Rmay also represent a group &#x2014;X&#x2014;R&#x2014;CR(OH)SO), wherein X, R, and Rassume one of the meanings listed below, Rrepresents hydrogen, alkyl, or aryl, X is selected from the group of direct C&#x2014;C bond, &#x2014;O&#x2014;, &#x2014;CH&#x2014;O&#x2014;, &#x2014;CH&#x2014;NR&#x2014;, &#x2014;COO&#x2014; or &#x2014;CONR&#x2014;, Rrepresents hydrogen, alkyl, or aryl, Rrepresents alkylene, polyoxyalkylene, cycloalkylene, or arylene, and Rrepresents hydrogen, alkyl, cycloalkyl, or aryl. 

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Heidelberg, Germany

Stefan Nogai