Process for producing a foam body by crosslinking vinyl chloride resin

Patent · Tue Sep 30 04:00:00 EDT 1969

OSTI ID:4336093

Nishikawa, A; Hosokawa, M; Honda, T

A crosslinked vinyl chloride foam body is economically provided that is self-fire extinguishing, elastic, heat resistant, insoluble in solvent, and capable of secondary processing properties as well as the inherent properties of vinyl chloride by the action of ionizing radiation on a composition consisting of a foaming agent of usual decomposition type and one of the copolymers consisting of vinyl chlorides and ethylene or polyethylenes, subsequently the composition is heated above the decomposition temperature of the foaming agent. The efficiency of cross-linking is particularly excellent within the range between 1 and 40%, preferably between 5 and 20%, of polyethylene or ethylene for polyvinyl chloride resin. In one example, 100 pads by weight of vinyl chloride and ethylene copolymer, 10 parts of vinyl acetate and ethylene copolymer, 2 pads of basic lead sulfite, 0.5 parts of calcium stearate, 30 parts of dioctyl phthalate and l5 parts of azodicarbonamide as a foaming agent were mixed and extruded into a sheet of 2 mm in thickness and 120 mm in width out of a 40 mm extruder at 130 deg C. The sheet was caused to generate foam by electron-beam irradiation in air at 220 deg C for 3 min at a dose of 3, 6, or 12 M rad. The produced foams were independent of one another and excellent in cushion performance. (JA)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-29-029120
• OSTI ID: 4336093
• Report Number(s): JP 734863
• Country of Publication: Japan
• Language: Japanese

Related Subjects

*POLYVINYL CHLORIDE-- CHEMICAL RADIATION EFFECTS
*RESINS-- CHEMICAL RADIATION EFFECTS
ACETIC ACID ESTERS
CHLORINATED ALIPHATIC HYDROCARBONS
COPOLYMERIZATION
CROSS-LINKING
ETHYLENE
FOAMS
GAMMA RADIATION
IONIZING RADIATIONS
N40300* --Chemistry--Radiation Chemistry
POLYETHYLENES
PVC
VINYL MONOMERS