Wacker-chemie Gmbh

Norman Dorsch

August Schiller

Oswin Sommer

Wolfgang Hechtl

Alois Strasser

Erhard Bosch

Stefan Oberneder

Werner Graf

Rudolf Heinrich

Wolfgang Ziche

Karl Braunsperger

Michael Stepp

Eckhart Louis

Ernst Wohlfarth

Erich Pilzweger

Alfred Heinrich

Christian Finger

Ingo Craubner

Alfred Kurz

Susanne Straussberger

Christian Baumgartner

Owsin Sommer

Michel Dubois

The invention relates to a method for producing organopolysiloxane terminated with alkoxy groups, wherein A) organopolysiloxane terminated with HO is reacted with B) alkoxysilane having at least three alkoxy groups and/or whose partial hydrolysate is made to react in the presence of C) acid phosphoric acid ester of general formula (I): (HO) OP(&mdash;O&mdash;&lsqb;(CR ) &mdash;O&rsqb; &lsqb;(CR ) &rsqb; &mdash;L&mdash;M) , wherein a&equals;1 or 2; R and R &equals;a hydrogen, methyl or hydroxyl radical; b and d&equals;2 or 3; c&equals;integral values from 2 to 15; e&equals;0 or 1; L&equals;a radical from the group &mdash;O&mdash;, &mdash;COO&mdash;, &mdash;OOC&mdash;, &mdash;CONR &mdash;, &mdash;NR CO&mdash; and &mdash;CO&mdash;; R and R &equals;a hydrogen or a C -C -alkyl radical and M&equals;a monovalent, optionally a hydroxyl, fluorine, chlorine, bromine, C -C -alkoxylalkyl or cyano group substituted C - to C -hydrocarbon radical, provided that the radicals R and R can only be at one given time a hydroxyl radical in each hydrocarbon atom. The invention further relates to RTV-1-alkoxy masses comprising the reaction product containing organopolysiloxane terminated with alkoxy groups as the essential constituent.

Organopolysiloxane materials which can be cross-linked by cleaving alcohols into elastomers

Storage-stable organopolysiloxane compositions which can be crosslinked to give elastomers with elimination of alcohols

Cross-linkable organopolysiloxane materials formed into elastomers by separating alcohols

Organopolysilozane compositions crosslinkable with elimination of alcohols to give elastomer

Organopolysiloxane compounds cross-linkable by cleaving of alcohols to

The compositions proposed contain, as their main constituents,

Tin compound-containing compositions as one of the two components of two

Sealing compositions containing dispersions of polymers of ethylenically unsaturated monomers comprising

Sealing compositions containing polymers of ethylenically unsaturated

Organopolysiloxane compositions which crosslink at room temperature to form paintable elastomers containing (3) an organopolysiloxane having SiC-bonded radicals with a basic nitrogen and/or (4) a branched organopolysiloxane.

Paintable organopolysiloxane compositions which crosslink at room

Compositions which can be stored in the absence of moisture, but crosslink in the presence of moisture at room temperature to form elastomers comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound having at least three hydrolyzable groups bonded directly to silicon per molecule, an average of at least one acyloxy group being present as a hydrolyzable group per silicon atom in the silicon compound, and an organosilicon compound having at least one vicinal epoxy group, in which at least part of the organosilicon compound containing at least one vicinal epoxy group is a cyclic diorganopolysiloxane. These compositions are prepared by mixing under anhydrous conditions a diorganopolysiloxane having terminal condensable groups with a silicon compound having at least three hydrolyzable groups bonded directly to silicon per molecule, an average of at least one acyloxy group being present as a hydrolyzable group per silicon atom in the silicon compound and an organosilicon compound having at least one vicinal epoxy group, in which at least part of the organosilicon compound containing at least one vicinal epoxy group is a cyclic diorganopolysiloxane.

Compositions which crosslink in the presence of moisture at room

The invention relates to organopolysiloxane compositions which can be crosslinked to form elastomers with the elimination of alcohols and are stabilized by salts of the second main group or sub-group with branched-chain carboxylic acids having from 5 to 15 carbon atoms.

Organopolysiloxane compositions which can be crosslinked to form

Compositions which are stable when stored under anhydrous conditions, but which crosslink to form elastomers when exposed to moisture at room temperature are prepared by mixing (1) a diorganopolysiloxane having terminal condensable groups, with (2) a silicon compound containing at least three groups per molecule selected from amino groups which are bonded to silicon via nitrogen, oxime groups which are bonded to silicon via oxygen or mixtures thereof and (3) a product which is obtained from the reaction of (a) a silane containing as hydrolyzable groups at least two monovalent hydrocarbon radicals per molecule which are bonded to silicon via oxygen in which the monovalent hydrocarbon radicals may be interrupted by at least one ether-oxygen, or an oligomer thereof, with (b) a diorganotin diacylate, in which all the valences of the tin atom in the reaction product are saturated by SnC-bonded monovalent radicals or by oxygen atoms of the .tbd.SiOSn.tbd. group.

Organopolysiloxane compositions which are stable under anhydrous

Compositions which can be stored under anhydrous conditions but when exposed to moisture crosslink at room temperature to form elastomers, comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound containing at least three hydrolyzable groups per molecule which are bonded to silicon, and an alkylenediamine in which at least one hydrogen atom that is bonded to a nitrogen atom of the alkylenediamine is substituted with a polyalkylene oxide.

Organopolysiloxane compositions and elastomers formed therefrom

The invention relates to organopolysiloxane compositions which are stable when stored under anhydrous conditions, but when exposed to moisture cure to an elastomer containing (a) a diorganopolysiloxane having terminal condensable groups, (b) a silicon compound having 3 amino groups bonded to silicon via nitrogen and/or oxime groups bonded to silicon via oxygen per molecule and (c) a silicon compound having at least one thiol group selected from mercapto-functional silanes or siloxanes. The presence of the mercapto-functional silanes or siloxanes substantially retards the formation of skin but does not substantially extend the cure time of the organopolysiloxanes compositions. These compositions are useful in, for example, screen printing, where a long skin-over time is desired.

Organopolysiloxanes having retarded skin formation

Compositions which are stable when stored under anhydrous conditions, but when exposed to atmospheric moisture cross-link to form elastomers comprising (1) an organopolysiloxane having terminal condensable groups, (2) a silicon compound having at least 3 Si-bonded hydrolyzable groups per molecule and (3) from 30 to 100 percent by weight, based on the weight of the organopolysiloxane (1), of a powder obtained from the homopolymerization or copolymerization of an acrylonitrile in an aqueous medium.

This invention relates to compositions which can be stored under anhydrous conditions, but when exposed to atmospheric moisture cure at room temperature to form elastomers. These compositions contain a diorganopolysiloxane having terminal condensable groups, a silicon compound having at least one nitrogen atom and at least three hydrolyzable groups per molecule, a reinforcing filler and a phosphoric acid ester. These compositions have improved stability and improved flow properties. Elastomers prepared from these compositions when compared with known compositions, have lower modulus values at 100 percent elongation.

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Burghausen, Germany

Norman Dorsch