Cross-linked plastics based on cyanic acid esters and method of production thereof
AssigneeBayer Aktiengesellschaft
InventorsRudolf Sundermann, Gunther Rottloff, Ernst Grigat
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Abstract
The present invention relates to novel, substantially insoluble and infusible plastics which are cross-linked by way of triazine rings and, optionally, by way of tri-substituted bis-oxymethylene urea groups or urethane groups.
Claims17
A process for the production of crosslinked plastics based on cyanic acid esters comprising:
- (A) reacting organic polyhydroxyl compounds with polycyanic acid esters at temperatures of from 30.degree. to 150.degree. C. to form partially crosslinked organic solvent-soluble prepolymers, and
- (B) hardening said prepolymer by heating it to from 100.degree. to 350.degree. C.
A process for the production of crosslinked plastics based on cyanic acid esters comprising:
- (A) reacting organic polyhydroxyl compounds with polycyanic acid esters at temperatures of from 30.degree. to 150.degree. C. to form partially crosslinked, organic solvent-soluble prepolymers, and
- (B) reacting it with an organic polyisocyanate.
Soluble prepolymers which are stable in storage at room temperature and which contain hydroxyl groups, triazine rings, iminocarboxylic acid ester groups, and optionally free cyanate groups obtained by reacting organic polyhydroxyl compounds with polycyanic acid esters at temperatures of from 30.degree. to 150.degree. C. to form partially crosslinked, organic solvent-soluble prepolymers.
In a process for the production of crosslinked polyurethane plastic by reacting a reaction mixture comprising:
- (A) relatively high molecular weight compounds containing isocyanate-reactive hydrogen atoms and
- (B) organic polyisocyanates, the improvement wherein said component (A) containing soluble prepolymers which are stable in storage at room temperature and which contain hydroxyl groups, triazine rings, iminocarboxylic acid ester groups, and optionally free cyanate groups obtained by reacting organic polyhydroxyl compounds with polycyanic acid esters at temperatures of from 30.degree. to 150.degree. C. to form partially crosslinked, organic solvent-soluble prepolymers.
A process for the production of crosslinked plastics based on cyanic acid esters comprising:
- (A) reacting polypropylene glycol with bis-2,2-(4-cyanatophenyl)-propane at temperatures of from 30.degree. to 150.degree. C. to form a partially crosslinked, organic solvent-soluble prepolymer, and
- (B) hardening said prepolymer by heating it to from 100.degree. to 350.degree. C.
A process for the production of crosslinked plastics based on cyanic acid esters comprising:
- (A) reacting organic polyhydroxyl compounds with or polyfunctional cyanic acid esters at temperatures of from 30.degree. to 150.degree. C. to form a partially crosslinked, organic solvent-soluble prepolymer, and
- (B) hardening said prepolymer (i) by heating it to from 100.degree. to 350.degree. C., and (ii) by reacting it with polyisocyanates.
Dependencies are inferred from the claim text.