| abstract |
Foaming a polyolefin, such as a polyethylene composition, using as a nucleating agent a combination of (A) azodicarbonamide and (B) a mixture of the first component of (1) and the second component of (2) A method of preparing: (1) a first component consisting of at least one of citric acid and alkali metal citrate, and (2) alkali metal citrate, di-alkali metal hydrogen citrate, alkali metal di-hydrogen citrate, and alkali A second component comprising at least one of a metal bicarbonate, with the proviso that the mixture does not consist solely of alkali metal citrate. |