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US 4,394,288 AGranted
Activated ammonium nitrate plastic foam blowing agent
AssigneeThe Dow Chemical Company
InventorSambasiva R. Allada
Life of this patent
Estimating the term…
Abstract
Ammonium nitrate activated or catalyzed with certain chromium compounds provides an excellent, low cost blowing or expanding agent(s) for many foamable polymers, including polyethylene(s), polystyrene(s), etc.
Claims4
A blowing agent system for foaming expandable resinous thermoplastic material masses, comprising an intimate, generally "fluffy" and finely divided powder composition of:
- (a) ammonium nitrate;
- and
- (b) up to about 10 parts per hundred by weight, based on total composition weight, of a chromium compound selected from the group consisting of:
- inorganic and organic salts of chromium;
- oxides of chromium excepting the crystalline sesquioxide but including amorphous forms thereof;
- and mixtures of same;
- said composition having an average particle size range on the order of between about 1/2 and about 50 microns;
- (c) up to about 4 percent by weight, based on total composition weight of a surfactant or soap additament.
5 more elements
Dependencies are inferred from the claim text.