Foamed thermo-elastic article
AssigneeDsm N.V.
InventorsRyszard Brzoskowski, Mohammad R. Sadeghi, Yungdong Wang
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Abstract
Foamed thermoplastic polyolefin elastomer is formed by heating a foamable thermoplastic polyolefin elastomer-containing polymeric composition containing each of a first water-releasing blowing agent which is at least one of metal hydroxide and water hydrate of a salt of a metal of Group 1 or Group 2 of the Periodic Table and a second blowing agent which is neither a metal hydroxide nor a water hydrate of a salt of a metal of Group 1 or Group 2 of the Periodic Table, to a temperature above the melting point of the polyolefin elastomer. The second blowing agent may be a chemical blowing agent and may release, water, a mixture of water and carbon dioxide or another gas, including carbon monoxide, carbon dioxide, and nitrogen.
Claims21
Process for preparing a foamed polymeric article comprising heating a polymeric composition, said composition comprising a thermoplastic polyolefin elastomer, a first blowing agent and a second blowing agent, to a temperature at which the first blowing agent releases water, to foam said thermoplastic polyolefin elastomer, said temperature being above the melting point of the thermoplastic polyolefin elastomer, wherein said first blowing agent is a water releasing chemical compound selected from the group consisting of a metal hydroxide, a Group 1 or 2 or the Periodic Table metal salt containing hydrate water or mixture thereof, and wherein said second blowing agent is not a metal hydroxide or a Group 1 or 2 of the Periodic Table metal salt containing hydrate water.
Foamable polymeric composition comprising a thermoplastic polyolefin elastomer, a first blowing agent which is at least one of water releasing compound selected from metal hydroxide or a salt of a metal of Group 1 or 2 of the Periodic Table containing hydrate water, and a second blowing agent which is other than a metal hydroxide or salt of a metal of Group 1 or 2 of the Periodic Table containing hydrate water.
Dependencies are inferred from the claim text.