CROSSLINKED FOAM

• Main Authors: MONGAKI KAZUMI, MORINO KATSUAKI
• Format: Patent
• Language: English
• Published: 29.06.1999
• Edition: 6
• 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; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; 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

PROBLEM TO BE SOLVED: To provide a low-cost crosslinked foam suitable as a shoe sole material, having a high wet-skid resistance and a low shrinkage after crosslinking foaming. SOLUTION: The foam is obtained by crosslinking foaming a rubber composition containing (A) 1,2-polybutadiene wherein the vinyl bond content is 70% or larger, the crystallinity is 5% or larger and the intrinsic viscosity [η] (determined in a toluene solvent at 30 deg.C) is 0.5 dl/g or larger, (B) at least one chosen from a natural rubber, a diene synthetic rubber except the 1,2-polybutadiene of (A) and a block copolymer of an aromatic vinyl compound and a conjugated diene compound here, the weight ratio of components (A) to (B) [(A)/(B)] is from 30/70 to 90/10}, (C) a foaming agent and (D) a crosslinking agent, through injection molding or transfer molding.