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US 4,334,030 AGranted
Thermoplastic foamable blends
AssigneeGeneral Electric Company
InventorJohn E. Kochanowski
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Abstract
Foamable blends are provided of high performance thermoplastic polymers such as polyphenylene oxides, polystyrenes, etc., and an effective amount of a first blowing agent which is an amide derivative of azodicarboxylic acid and a second blowing agent which is a dihydrooxadiazinone.
Claims17
A substantially uniform injection moldable foamable blend comprising:
- (i) a thermoplastic organic polymer;
- (ii) a dihydrooxadiazinone represented by the formula ##STR6## wherein n is an integer equal to 1 or 2;
- R is a monovalent radical when n is 1, and a divalent radical when n is 2, selected from a C.sub.(1-8) alkyl radical or alkylene radical, a C.sub.(6-30) aryl radical or arylene radical and halogenated derivatives thereof;
- R.sup.1 and R.sup.2 are independently selected from hydrogen, C.sub.(1-8) alkyl, alkylene, C.sub.(6-30) aryl, alkoxy and aryloxy radicals;
- and,
- (iii) amide derivatives of azodicarboxylic acid represented by the general formula ##STR7## wherein R.sup.3 and R.sup.4 are independently selected from hydrogen and C.sub.(1-10) alkyl radicals.
3 more elements
Dependencies are inferred from the claim text.