Abstract:
NOVEL ALDIMINES AND KETIMINES WHICH CONTAIN HYDROXYMEHTYL GROUPS ARE PROVIDED. THESE NEW COMPOUNDS ARE PREPARED BY REACTING SCHIFF''S BASES WHICH HAVE ACTIVE HYDROGEN ATOMS IN A-POSITION TO THE $C=N-GROUP WITH SOLVENTS ARE REQUIRED. THE REACTION PROCEEDS EXOTHERMICALLY AT TEMPERATURES AS LOW AS 0*C. AND THE PROCESS MAY ING AGENTS FOR THE PREPARATION OF POLYURETHANE PLASTICS.
Abstract:
Novel aldimines and ketimines which contain hydroxy methyl groups are provided. These new compounds are prepared by reacting Schiff''s bases which have active hydrogen atoms in Alpha position to the C N-group with formaldehyde or formaldehyde yielding compounds. The new compounds can, e.g., be used as plasticizing chain lengthening agents for the preparation of polyurethane plastics.
Abstract:
NOVEL ALDIMINES AND KETIMINES WHICH CONTAIN HYDROXYMETHYL GROUPS ARE PROVIDED. THESE NEW COMPOUNDS ARE PREPARED BY REACTING SCHIFF''S BASES WHICH HAVE ACTIVE HYDROGEN ATOMS IN A-POSITION TO THE >C=N GROUP WITH FORMALDEHYDE OR FORMALDEHYDE YIELDING COMPOUNDS. THE NEW COMPOUNDS CAN BE USED AS PLASTICIZING AGENTS FOR THE PREPARATION OF POLYURETHANE PLASTICS.
Abstract:
Imines substituted in the Alpha -position are obtained by reacting mono- or polyimines (ket- and aldimines) with an electrophilic olefin (i.e., acrylic and metacrylic acid derivatives) at a temperature between 10* and 150* C, optionally under pressure and optionally in the presence of an inert solvent. The imines modified by the process of the invention have many possible uses and represent valuable intermediates for many organic syntheses. The new compounds obtainable according to the process can be used in the preparation of elastic moulding masses.
Abstract:
The invention relates to new polyamines, preferably containing polyether segments, a process for their preparation and their use as starting components for the production of polyurethane resins. The process involves producing ketimines, aldimines or enamines containing hydroxyl groups by reacting a hydroxyl amine with an aldehyde or ketone and removing the water by product. The ketimine, aldimine, or enamine is then reacted with an NCO prepolymer wherein the hydroxyl group of the material reacts with the isocyanate group without disturbing the blocked amine. This polyaddition product is then hydrolyzed to unblock the high molecular weight polyamine.
Abstract:
The invention relates to new polyamines, preferably containing polyether segments, a process for their preparation and their use as starting components for the production of polyurethane resins. The process involves producing ketimines, aldimines or enamines containing hydroxyl groups by reacting a hydroxyl amine with an aldehyde or ketone and removing the water by product. The ketimine, aldimine, or enamine is then reacted with an NCO prepolymer wherein the hydroxyl group of the material reacts with the isocyanate group without disturbing the blocked amine. This polyaddition product is then hydrolyzed to unblock the high molecular weight polyamine.
Abstract:
The present invention relates to a process for the production of polyurethane ureas from a prepolymer which contains isocyanate groups and a mixture of hardeners containing amino groups, in the presence of water, and optionally in the presence of solvents, characterized in that the mixture of hardeners comprises compounds corresponding to the following general formulae: