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US 11,104,641 B2Granted
Biscarbodiimides and polycarbodiimides and method for their preparation
AssigneeDow Global Technologies LLC
InventorsAndrew M. Camelio, Arkady L. Krasovskiy
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Abstract
The present disclosure describes a method of synthesizing carbodiimides comprising providing an alkylisothiourea, providing a thiophilic reagent to the reaction mixture and reacting under conditions sufficient to provide the carbodiimide, and wherein the carbodiimide is a polycarbodiimide or a biscarbodiimide. The present disclosure further describes methods for isolating the carbodiimides. The present disclosure additionally describes isolated carbodiimide compositions.
Claims8
A method of synthesizing polycarbodiimides or biscarbodiimides comprising:
- (a) providing an alkylisothiourea of formula (1) to a reaction mixture;
- where:
- R1═H;
- (C1-C40)hydrocarbyl;
- R2═(C1-C40)hydrocarbyl;
- R3═H;
- (C1-C40)hydrocarbyl;
- R4═H;
- or absent;
- R5═H;
- or absent;
- R6═(C1-C40)alkyl;
- R7═H;
- (C1-C40)hydrocarbyl;
- a is 0 or 1;
- b is from 1 to 10;
- and
- c is from 1 to 10;
- (b) providing a thiophilic reagent to the reaction mixture and reacting under conditions sufficient to provide the polycarbodiimide or the biscarbodiimide, wherein the thiophilic reagent comprises halide, amine, nitrile, triflate, nitrate, acetate, acetylacetonate, carbonate, oxalate, oxide, phosphate, sulfite, sulfate of copper, zinc, gold, molybdenum, mercury, tungsten, nickel, silver, iron, cobalt, or manganese.
16 more elements
Dependencies are inferred from the claim text.