Uniroyal Inc.

Uniroyal Chemical Company, Inc.

Byron A Hunter

Donald G Rowland

Franklin H Barrows

Lee D Hansen

Warren J Peascoe

Irwin A Prager

John W Zukel

Robert W Brown

Gerald J Hollmann

Foamed elastomeric compositions are produced by a process comprising the steps of (A) forming a blend comprised of (1) a foamable, curable elastomer; (2) a curative; and (3) a blowing agent composition consisting essentially of (i) azodicarbonamide and (ii) at least one member selected from the group consisting of zinc salt of C.sub.1 -C.sub.6 organic acids and C.sub.1 -C.sub.6 carboxamides; and (B) heating such blend to between about 130.degree. C. and about 170.degree. C. for a period of time sufficient to foam and cure such blend.

Process for producing foamed elastomeric compositions

A blowing agent composition, comprising: (i) azodicarbonamide; (ii) zinc oxide and/or zinc carbonate; and (iii) at least one member selected from the group consisting of zinc salts of C.sub.1 -C.sub.6 organic acids, and C.sub.1 -C.sub.6 organic carboxamides characterized by a high gas evolution rate. The blowing agent composition may be used in effective amounts in formulations containing a foamable polymer to yield an efficiently gas expanded polymeric composition upon exposure to heat. Suitable C.sub.1 -C.sub.6 organic acids for said zinc salts include straight-chain carboxylic acids, and useful organic carboxamides include formamide.

Blowing agent composition

The present invention relates to an improved nitro urea compound specifically the zinc salt of nitro urea useful as a blowing agent composition, its preparation and its use.

Nitro-urea based blowing agents

Nitro urea based blowing agents

A blowing agent composition is provided comprising:

Blowing agent composition containing zinc formate and metal salt

Sulfonyl carbazates containing at least one group of:

Sulfonyl carbazates

N,N'-disubstituted sulfonyl hydrazine with the following structural formula are disclosed:

N,N-Disubstituted sulfonyl hydrazines

Novel blowing agents are disclosed comprising 3,3'-carbonylbis(organo carbazates). The organo group may be alkyl, cycloalkyl, aryl or aralkyl moieties. In the preferred embodiment the organo group is an alkyl group selected from the group consisting of methyl, isopropyl, secondary butyl or tertiary butyl. The blowing agents find utility in the preparation of expanded organoplastic materials such as rubbers, thermosetting resins and thermoplastic resins.

3,3-Carbonylbis(carbazates) as blowing agents

Sulfonyl carbazates as blowing agents

Hydrocarbylsulfonyl carbohydrazides of the following structural formulae are disclosed for use as blowing agents: ##STR1## The compounds wherein the R groups are alkyl are novel, as are the polymeric products.

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Woodbridge, CT, United States of America

Byron A Hunter