DE1019825B - Process for converting polyacroleins - Google Patents

Description

ANNOUNCEMENT OF THE APPLICATION AND ISSUE OF THE EDITORIAL: NOVEMBER 21, 1957

Addition to patent application D20095 IVb / 39-e (Interpretation document 1016 020)

Applicant: German gold and silver refinery

formerly Roessler, Frankfurt / M., Weißfrauenstr. 9

Dr. Otto Schweitzer, Königstein (Taunus), Dr. Werner Kern, Dr. Rolf Schulz

and Dipl.-Chem. Rudolf Holländer, Mainz, have been named as inventors

Procedure for implementation

Subject of the main patent application D 20095 IVb /
39 c is a process for converting polyacroleins,
based on which polyacroline, e.g. the so-called disacryl,
or copolymers of polyacrolein, which are predominantly
are made up of acrolein, in the acidic or alkaline 5
Medium to be implemented with compounds that with
Aldehyde groups can react. Such compounds are alcohols, thioalcohols, thiophenols,
Hydroxylamine compounds, bisulfites, hydrazine, semicarbazides, ammonia or aldehydes, for example io
called. These conversion products are characterized by
a better solubility compared to the polyacrolein.
In the further development of the process was now
found that it is possible to use macromolecular polymerization products of acrolein, e.g. B. disacryl, or 15
macromolecular polymerization products of acrolein substitution compounds or copolymers of acrolein or of substituted acrolein by treatment
with an aqueous solution of sulfur dioxide in a
Form that is soluble in this aqueous solution 20
is. The viscous solutions obtained in this way, the
can be created even at room temperature
evaporate, creating crystal-clear solid products.
During evaporation, the 2

used excess of sulfur dioxide largely 35

remove. When the concentration is increased, the usual aldehyde reactions are formed. Partially existing Al first clear, colorless, highly viscous solutions; those in dehydrated ethers are cleavable in the usual way, the complete drying remaining crystal-clear solid The solutions according to the invention or their already

Products are largely insoluble. They are resistant to the various mixtures mentioned above the majority of the known solvents 30 are suitable for the surface treatment of threads, films, and also towards water. Also with temperature artificial leather. They are also useful for treatment There is no significant change in the increase in animal hides and leather that has already been tanned. she Solubility a. This property, namely the formation, can be used in a pure state, but also in combination insoluble varnish is used by simply drying the nation with the usual tanning agents aqueous solution without heating is technically valuable. 35 become.

One can therefore use such solutions as an adhesive

turn, which after drying easily a single thread as well as only with the finished fabric result in a moisture-resistant adhesive film. to undertake. For the surface treatment of

A certain amount of tissue can often be found in the evaporated product, even a small percentage. It is also possible to use such solutions as a result of the chemically bound sulphurous acid. Of sulfur as an additive to aqueous solutions of urea or content may, for example, / ₀ are at 8.7 °. Melamine resins. They are also useful as a supplement

The aqueous solutions are miscible with soft for all types of aqueous solutions of natural Makers such as glycerine or other polyalcohols or protein products such as casein or gelatin, and to water them Derivatives. You can use fillers and pigmented solutions of corresponding synthesis products, ments are provided. They are also suitable for mixing phenolic resins with such solutions highly cuttable with solutions of water-soluble ones. They are also suitable as a supplement too molecular substances, with dispersions and emul- natural and synthetic rubber latex and sions. One can add the acidic hydroxyl groups of their concentrates and to plastic emulsions of all accumulated sulphurous acid with inorganic bases 50 Art.

or neutralize amines. One may also adjust as necessary the _pH value after the alkaline or acidic side. Most of the remaining aldehyde groups in polyaldehyde are accessible to everyone

The aldehyde groups remaining after such mixtures have dried from the dissolved acrolein fractions allow to a certain extent, even after the fixation, all other characteristics characteristic of the aldehyde group.

709 806/355

see implementations. These solutions are hereby a useful tool for many purposes.

It is possible, such a reaction product, in which only a limited part of the macromolecule with the sulphurous acid reacted to its remaining groups, d. H. the majority of its remaining reactive sites in the usual way, e.g. B. also according to patent application B 20 095 IVb / 39c, whole or partially implement.

example

7.5 parts of acrolein polymer are poured over with a solution of 18.5 parts of SO ₂ in 100 parts of water. After 3 × 24 hours the polymer is dissolved at room temperature. A hard, crystal-clear film forms on evaporation.

Claims (2)

Patent claims: 1. Further development of the process according to the main patent application D 20 095 IVb / 39c, thereby characterized in that macromolecular polymerization products of acrolem or of substituted Acrolein or copolymers of acrolein, ίο which are mainly composed of acrolein, are treated _{with an aqueous solution of SO 2.} 2. The method according to claim 1, characterized in that the treatment at room temperature is carried out.