| abstract |
A process for foaming a polyolefin composition, such as polyethylene, using as a nucleating agent a combination of (A) azodicarbonamide, and (B) a mixture of: (1) a first component, which Consisting of at least one of citric acid and an alkali metal citrate, and (2) a second component consisting of an alkali metal citrate, a dialkali metal hydrogen citrate, an alkali metal dihydrogen citrate and an alkali At least one of metal bicarbonates, with the proviso that the mixture consists solely of alkali metal citrates. |