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AssigneeJsp Corporation
InventorsKuninori Hirosawa, Yoshihisa Ishihara, Takeshi Aoki, Yasushi Terui, Yoshinori Shimojo, Hiroyuki Gokuraku, Naochika Kogure
Estimating the term…
A polycarbonate resin-containing composition is extruded through a die together with a blowing agent to produce a foamed body. The composition has a storage modulus G'.sub.A dyn/cm.sup.2 at a temperature of 250.degree. C. and an angular frequency of 0.1 rad/sec and a storage modulus G'.sub.B dyn/cm.sup.2 at a temperature of 250.degree. C. and an angular frequency of 10 rad/sec, wherein the storage modulus G'.sub.A and storage modulus G'.sub.B satisfy the following conditions: 0.ltoreq..alpha..ltoreq.2.0 2.20.ltoreq..beta..ltoreq.5.70 where .alpha. represents (logG'.sub.B -logG'.sub.A)/2 and .beta. represents (logG'.sub.B+logG'.sub.A)/2.
A process for producing a foamed plate or sheet having a density of 0.03-0.35 g/cm.sup.3, said process comprising continuously extruding, through a die selected from circular extrusion dies and flat extension dies, a composition comprising a polycarbonate resin, a volatile organic blowing agent and an inorganic blowing agent, said composition having a storage modulus G'.sub.A dyn/cm.sup.2 at a temperature of 250.degree. C. and an angular frequency of 10 rad/sec, said storage modulus G'.sub.A and storage modulus G'.sub.B satisfying the following conditions:
An extruded foamed plate or sheet having a density of 0.03-0.35 g/cm.sup.3 and a composition comprising a polycarbonate resin, said composition having a storage modulus G'.sub.A dyn/cm.sup.2 at a temperature of 250.degree. and an angular frequency of 0.1 rad/sec and a storage modulus G'.sub.B dyn/cm.sup.2 at a temperature of 250.degree. and an angular frequency of 10 rad/sec, said storage modulus G'.sub.A and storage modulus G'.sub.B satisfying the following conditions:
Dependencies are inferred from the claim text.