Process for producing foamed body of polycarbonate resin and foamed body obtained thereby
US5854294A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Jan 14, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/507
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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: EQU 0.ltoreq..alpha..ltoreq.2.0 EQU 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.