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US 4,065,401 AGranted
Blowing agent mixture
AssigneeBayer Aktiengesellschaft
InventorsWolfgang Cohnen, Gerhard Apel
Life of this patent
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Abstract
The invention refers to a blowing agent composition consisting of 1,4 butan-diol-bis-(carbonic acid ester-benzoic acid anhydride) and silicon dioxide. Silicon dioxide reduces the decomposition temperature of the anhydride while at the same time increasing the yield of gas substantially.
Claims3
Blowing agent mixture consisting of from 85 - 60%, by weight, of 1,4-butanediol bis-(carbonic acid ester-benzoic acid anhydride) and from 15 - 40%, by weight, of silicon dioxide.
Dependencies are inferred from the claim text.