Catalysts for the preparation of carbodiimide foams and elastomers

Claim 2

A process for the preparation of a polyurethane containing carbodimide and/or isocyanurate structures which process comprises reacting an organic polyisocyanate with a compound containing at least two active hydrogen containing groups group in the presence, as catalyst, of an effective amount of a boronium salt containing a quaternary ammonium cation.

Claim 3

A process as claimed in claim 1 for the preparation of a foamed polyurethane wherein the process is effected in the presence of a blowing agent.

Claim 4

A process as claimed in claim 1 wherein the process is effected in the presence of a urethane-forming catalyst.

Claim 5

A process as claimed in claim 1 wherein the process is effected in the presence of a surfactant.

Claim 6

A process as claimed in claim 1 wherein the polyisocyanate is an isocyanate terminated prepolymer obtained by the reaction of an organic polyisocyanate with a compound having at least 2 active hydrogen atoms.

Claim 7

A process for preparing a compound containing carbodiimide and/or isocyanurate structures which process comprises condensing an organic poly-isocyanate in the presence as catalyst of an effective amount of boronium salt containing a quaternary ammonium cation and which salt has one of the following general formulae: ##STR9## where R a and R b : are the same or different divalent organic groups containing from 2 to 8 carbon atoms; R c , R d , R e and R f : are the same or different monovalent-organic groups having 1 to 20 carbon atoms R g , R h , R i and R j : are each a monovalent organic group having 1 to 20 atoms.

Claim 8

A process for preparing a compound containing carbodiimide and/or isocyanurate structures which process comprises condensing an organic poly-isocyanate in the presence as catalyst of an effective amount of boronium salt containing a quaternary ammonium cation and which salt has one of the following general formulae: ##STR9## where R a and R b : are the same or different divalent organic groups containing from 2 to 8 carbon atoms; R c , R d , R e and R f : are the same or different monovalent-organic groups having 1 to 20 carbon atoms R g , R h , R i and R j : are each a monovalent organic group having 1 to 20 atoms.

Claim 9

A process for the preparation of a foamed resin containing carbodimide and optionally isocyanurate structures which process comprises condensing an organic polyisocyanate in the presence, as catalyst, of an effective amount of a boronium salt of claim 6 containing a quaternary ammonium cation, the foaming action being effected by carbon dioxide gas generated in the reaction.

Claim 10

A process for the preparation of a film which comprises coating a substrate with a solution of an isocyanate terminated pre-polymer in the presence of an effective amount of a boronium catalyst which is a boronium salt containing a quaternary ammonium cation and which salt has one of the following general formulae: ##STR10## where R a and R b : are the same or different divalent organic groups containing from 2 to 8 carbon atoms; R c , R d , R e and R f : are the same or different monovalent-organic groups having 1 to 20 carbon atoms; R g , R h , R i and R j : are each a monovalent organic group having 1 to 20 atoms and allowing a cured film to form.

Claim 11

A process for the preparation of a film which comprises coating a substrate with a solution of an isocyanate terminated pre-polymer in the presence of an effective amount of a boronium catalyst which is a boronium salt containing a quaternary ammonium cation and which salt has one of the following general formulae: ##STR10## where R a and R b : are the same or different divalent organic groups containing from 2 to 8 carbon atoms; R c , R d , R e and R f : are the same or different monovalent-organic groups having 1 to 20 carbon atoms; R g , R h , R i and R j : are each a monovalent organic group having 1 to 20 atoms and allowing a cured film to form.