| http://www.w3.org/ns/prov#value | - In U.K. Patent Specification No. 1,044,397 published on Sept. 28, 1966, it is disclosed that as blowing agents for making foamed polyolefins, it is possible to employ all conventional inorganic and organic compounds which evolve a blowing gas, e.g. nitrogen or carbon dioxide, and it is further disclosed that the polyolefins to be foamed according to the invention have blowing agents which are know
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