Wacker Chemie Ag

Martin Bortenschlager

Peter Ball

Felicitas Schauer

Oliver Minge

Maria Leute

Thomas Frese

Manfred Hölzl

Susanne Hecher

Silvia Jung-Rossetti

The invention relates to the use of silane-modified polyvinyl alcohols for producing membranes, characterized in that the silane-modified polyvinyl alcohols can be obtained by a) radically initiated copolymerization of one or more vinyl esters from unbranched or branched carboxylic acids having 1 to 15 C-atoms and one or more ethylenically unsaturated silane compounds selected from the group comprising compounds of the general formulae CR2=CR&#x2014;B&#x2014;Si(OR')3-n(R&#x2033;)n (1), or CR2=CRC(&#x2550;O)-D-B&#x2014;Si(OR&#x2032;)3-n(R&#x2033;)n (2), wherein B is an aryl, heteroaryl or (CR2) m residue, wherein one or more non-neighboring CR2 groups can be replaced by heteroatoms as applicable, D is a heteroatom, R is a hydrogen atom, an alkyl or aryl residue or a heteroatom that is substituted as applicable by a hydrogen atom or an alkyl, aryl residue, OR is an alkoxy, alkylcarboxy or arylcarboxy residue, R&#x2033; is an alkyl or aryl residue and n 0, 1 or 2 and in 0 to 15, and b) subsequent saponification of the silane-modified vinyl ester copolymerizate obtained in step a).

Membranes based on polyvinyl alcohol

Composite materials contain a silicone addition crosslinkable silicone elastomer composition comprising an organopolysiloxane having aliphatic unsaturation, an Si&#x2014;H functional cyclic organopolysiloxane, a hydrosilylation catalyst, together with specific adhesion promoters, applied to a substrate material.

Self-adhesive silicone elastomers

The invention relates to a process for free-radically initiated heterophase polymerization, in which the polymerization of ethylenically monomers proceeds in a phase dispersed in the continuous phase, characterized in that one or more additives which are soluble in the continuous phase and insoluble in the disperse phase and stop the polymerization of the ethylenically unsaturated monomers in the continuous phase is/are added before or during the polymerization.

Free-radical polymerization process

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Bergkirchen, Germany

Martin Bortenschlager