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Non-flammable and optionally electrically conductive organo-silicate polymers and process for preparing same
| Details |
Inventors: Hilterhaus, Karl H.; Reuter, Franz G.; Menzel, Tankred;
Assignee: Metallgesellschaft A.G. (all of, DE1); Reuter Technologie GmbH (all of, DE1); Chemie-Anlagenbau Bischofsheim GmbH (all of, DE1)
Primary Examiner: Ivy; C. Warren
Assistant Examiner:
Attorney, Agent or Firm: Larson, Taylor and Hinds
This invention relates to a process for preparing organosilicate polymers by reaction of a water glass solution with a compound having at least two isocyanate groups. The reaction is carried out in the presence of a zwitterion compound acting as catalyst and optionally in the presence of propellants and/or water glass hardening agents, the zwitterion compound having in the molecule at least one group with positive charge, at least one group with negative charge, and additionally at least one hydrogen atom with Zerewitinov activity. |
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DETAILED DESCRIPTION What we claim is: 1.
In a process for preparing organosilicate polymers by reaction of a water glass solution with an isocyanate compound having at least two isocyanate groups, the improvement which comprises admixing with the water glass solutions prior to the introduction of said isocyanate compound into the reaction mixture, a zwitterion compound having in the molecule at least one group with positive charge, at least one group with negative charge, and additionally at least one hydrogen atom with Zerewitinov activity, the zwitterion compound being a tertiary amino compound of the general formula ##STR7## wherein the radicals R.
sub.
1, R.
sub.
2 and R.
sub.
3 stand for hydrogen atoms or a radical of the general formula ##STR8## wherein n is an integer from 1 to 25 and the radicals X.
sub.
1 and X.
sub.
2 are hydrogen atoms and/or alkyl radicals with 1 to 25 carbon atoms, the radicals R.
sub.
1, R.
sub.
2 and R.
sub.
3 may be different, at best two of the radicals R.
sub.
1, R.
sub.
2 or R.
sub.
3 may be hydrogen atoms, and the alkyl radicals may bear primary and/or secondary hydroxyl groups.
2.
Process according to claim 1 characterized in that the ratio of solids in the water glass solution employed to the isocyanate groups employed is within a range of 0.
1 to 6, based on the percentage of NCO groups and the dry weight of the water glass.
3.
Process according to claim 1 characterized in that as catalyst a tertiary amino compound of the general formula ##STR9## is used wherein the radicals R.
sub.
1, R.
sub.
2 and R.
sub.
3 stand for hydrogen atoms or a radical of the general formula ##STR10## wherein the radicals X.
sub.
1 and/or X.
sub.
2 are hydrogen atoms, alkyl radicals having from 1 to 25 carbon atoms, or the radical --(CH.
sub.
2).
sub.
m OH with m being an integer from 0 to 25, at best two of the radicals R.
sub.
1, R.
sub.
2 or R.
sub.
3 may be hydrogen atoms, and at least one of the radicals R.
sub.
1, R.
sub.
2, R.
sub.
3 must bear a hydroxyl group.
4.
Process according to claim 1 characterized in that the reaction is carried out in the presence of 2,4,6-tris(dimethylaminomethyl)phenol or of 2,4,6-tris(ethyl-2-hydroxy-ethyl-aminomethyl)phenol and optionally dibutyltin dilaurate
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