Blowing agents and their use in preparations of polyester foams

C - Chemistry – Metallurgy – 08 – J

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403/57

C08J 9/06 (2006.01)

Patent

CA 1208850

ABSTRACT OF THE DISCLOSURE Quaternary ammonium borohydrides of the formula Image wherein R1, R2 and R3 may be the same or different and each is selected from alkyl, alkenyl, cycloalkyl, aryl, alkaryl and aralkyl groups and R4 is selected from alkyl and alkenyl groups having from 1 to 30 carbon atoms, are useful as blow- ing agents in foamable polyester compositions. Compounds of the above formula in which R1, R2, R3 and R4 are not all alkyl or R1, R2 or R3 is not benzyl when the remainder of R1, R2, R3 and R4 are all methyl or ethyl are believed to be novel. The new borohydrides are prepared by either mixing a borohydride salt and a quaternary ammonium salt in alkaline aqueous solution and extracting the resulting quaternary amine borohydride with an organic solvent or by reacting finely divided borohydride salt with an organic solution of quaternary ammonium salt.

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