MANUFACTURE OF HIGHLY EXPANDED POLYOLEFINIC RESIN

• Main Authors: HOSHI KOURIKU, SAITOU KAZUAKI, NORO MASAJI
• Format: Patent
• Language: English
• Published: 17.08.1982
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PURPOSE:To simply manufacture a highly expanded polyolefinic resin by molding a polyolefinic resin under a condition that the resin is bridged at a gel fraction of 20% or less and a H.M.I. value of 15g/10min in the presence of an organic peroxide. CONSTITUTION:A polyolefinic resin is subjected to a cross-linking treatment by heating in the presence of an organic perxode to such an extent that gel fraction reaches 20% or less and H.M.I. reaches 15.0g/10min or less. Afterwards, the polyolefinic resin so treated is mixed with an organic solvent type blowing agnet of a low boiling point at a high temperature and a high pressure, and the mixture is extruded into a low-temperature and low-pressure region. Thus, a highly expanded polyolefinic resin can be manufactured economically by a simplified process.