Process and composition for producing open-cell cross linked polyolefin foam

Claim 1

A process for producing open-cell cross linked polyolefin foam which comprises forming a composition comprising 100 parts by weight of olefin resin, 1 to 20 parts by weight of blowing agent, 0.3 to 10 parts by weight of organic peroxide crosslinking agent, 0.1 to 10 parts by weight of trifunctional monomer, and 1 to 5 parts by weight of silicone oil or a derivative thereof having a viscosity lower than 10 cSt at room temperature, said organic peroxide having a 10-minute half-value temperature (T p ) of 110° C. to 170° C. and said blowing agent having a decomposition temperature (T f ) of 100° C. to 160° C., T p and T f satisfying the following equation: -10° C.≦T.sub.p -T.sub.f ≦50° C. molding said composition into pellets, powder, film or sheets, and subsequently heating said moldings in a single step.