C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/84, 260/541.
C08J 9/10 (2006.01) C07C 143/825 (1980.01)
Patent
CA 1100529
ABSTRACT OF THE DISCLOSURE Hydrocarbylsulfonyl carbohydrazides of the following structural formulae are disclosed for use as blowing agents: RSO2NHNH-?-NHNHSO2R and ?Y-SO2NHNH-?-NHNHSO2?n The compounds wherein the R groups are alkyl are novel, as are the polymeric products. This divisional application discloses an oligomeric(hydrocarbylsulfonyl) carbohydrazide of the formula Image wherein Y is a difunctional organic moiety selected from the group consisting of phenylene, alkarylene having 7 to 10 carbon atoms and a group of the structure -R1-A-R2- wherein A is selected from a single bond connecting R1 and R2, -O-, -S-, -SO-, -SO2-, alkylene with 1 to 6 carbon atoms, and alkylidene with 2 to 3 carbon atoms, wherein R1 and R2 are the same or different and are alkylene having 1 to 4 carbon atoms or phenylene, and wherein n is an integer of from 2 to about 50, as well as a method of expanding a gas-expandable polymeric material comprising heating a composition comprising a gas- expandable polymeric material and an oligomeric (hydrocarbyl- sulfonyl) carbohydrazide to a temperature in excess of the decomposition temperature of the oligomeric (hydrocarbylsulfonyl' carbohydrazide.
350317
Hunter Byron A.
Prager Irwin A.
Gowling Lafleur Henderson Llp
Uniroyal Inc.
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