METHOD FOR MEASURING CROSSLINKING DENSITY OF MOLDED ARTICLE OF CROSSLINKED THERMOPLASTIC POLYMER FOAM AND MOLDED ARTICLE OF CROSSLINKED FOAM

WIPO Patent Application WO/2012/018140

A1

The present invention relates to a molded article of a crosslinked ethylenic polymer foam. The molded article of a crosslinked ethylenic polymer foam has a crosslinking density of 0.30 mol/kg or higher as determined using a relaxation modulus based on a stress relaxation measurement obtained by measuring the stress relaxation of the molded article of the crosslinked foam when the molded article of the crosslinked foam is subjected to compressive deformation under conditions of a measurement temperature of 60ºC, compressive strain of 50%, and a measurement time of 1,800 seconds. The present invention also relates to a method for measuring the crosslinking density of a molded article of a crosslinked thermoplastic polymer foam, the method comprising: a step for heating the molded article of the crosslinked thermoplastic polymer foam to a predetermined temperature; a step for applying pressure to the molded article of the crosslinked thermoplastic polymer foam, which is maintained at the predetermined temperature, in order to induce compressive deformation of the molded article of the crosslinked foam, and for measuring the stress relaxation of the molded article of the crosslinked foam while the compressive strain of the molded article of the crosslinked foam is maintained at a constant level; a step for determining a relaxation modulus (Gc) from the stress relaxation; and a step for calculating the crosslinking density of the crosslinked thermoplastic polymer foam from Gc using the following formula in which Gc is the elastic modulus when the stress of the molded article of the crosslinked foam is at a constant level: n = Gc/RT (n: crosslinking density, R: gas constant, T: measurement temperature).

JPS6045216	[Title of the Invention] A fireproofing agent for poly-urethan forms
JP5305247	Sheet-shaped polyurethane resin molded product having a two-layer structure and its manufacturing method
JPS5690842	AMINE TERMINAL REACTIVE LIQUID POLYMER EPOXY FOAM

YAMADA KATSUHIRO (CN)
TOYODA HIROSHI (JP)

PCT/JP2011/068210

February 09, 2012

August 03, 2011

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SUMITOMO CHEMICAL CO (JP)
YAMADA KATSUHIRO (CN)
TOYODA HIROSHI (JP)

C08J9/06; A43B13/02; A43D25/06; A43D86/00; G01N3/08

JP2010077421A	2010-04-08
JP2007238783A	2007-09-20
JPH03213515A	1991-09-18

THE SOCIETY OF POLYMER SCIENCE, NYUMON KOBUNSHI TOKUSEI KAISEKI, 10 June 1984 (1984-06-10), JAPAN, pages 199 - 209

NAKAYAMA, Tohru et al. (JP)
Nakayama 亨 (JP)

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