CLOSED-CELL FOAM RUBBER SHEET, AND METHOD FOR PRODUCTION THEREOF

摘要

Disclosed is a closed-cell foam rubber sheet which is hardly deteriorated in a sealing property and exhibits an excellent water-proof property even when used for a long period. The closed-cell foam rubber sheet comprises a rubbery resin. The closed-cell foam rubber sheet is produced by: irradiating a foaming resin composition comprising the rubbery resin and a foaming agent with an ionized radioactive ray to crosslink the foaming resin composition; and foaming the crosslinked product. When the foaming resin composition contains 0.5 part by weight or more of a powdery additive other than the foaming agent relative to 100 parts by weight of the rubbery resin, it is preferred to add another rubbery resin which is in a liquid form at room temperature to the rubbery resin.