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Title: Process for the production of polyolefin foam sheets containing pore regulators

Abstract: A process for producing a continuous foam sheet of a synthetic resin having a polyolefin base which comprises admixing an organic peroxide, a blowing agent, and a pore regulator with the synthetic resin, finely distributing said peroxide, blowing agent and pore regulator within said resin at a temperature below the decomposition temperature of the peroxide and the blowing agent in the thermoplastic range, shaping the resulting admixture into a sheet or panel and thereafter effecting thermal crosslinking and foaming of the resin. The pore regulator comprises an oligomeric and/or polymeric saturated dicarboxylic acid ester or a mixture of such esters having average molecular weights of from between 500 and 40,000, and flow points and/or melting ranges that are below the decomposition temperature of the peroxide and of the blowing agent.


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Inventors: Kuhnel, Werner (Neunkirchen, DE, US)
Spielau, Paul (Troisdorf-Eschmar, DE, US)

Application Number: 726604
Filing Date: 1976-09-27
Publication_date: 1979-07-31
Assignee: Dynamit Nobel AG (DE)
Primary Class(es): 521/96 264/54, 264/211, 264/DIG13, 264/DIG18, 521/97, 521/138, 521/143, 521/144, 521/189
Other Classes:
US Patent Ref:
3306875Feb, 1967Hay528/215.
3927159Dec, 1975Tomikawa260/2.
3965054Jun, 1976Nojiri et al.260/2.
3966651Jun, 1976Kleiner et al.260/2.

Other Refs:
Primary Examiner: Anderson, Harold D.
Assistant Examiner:
Attorney: Craig and Antonelli