METHOD FOR DECOMPOSING CROSSLINKED RUBBER

WIPO Patent Application WO/2023/153379

A1

The present invention addresses the problem of providing a method for decomposing a crosslinked rubber, with which monomer yield can be improved. A means for solving this problem is a method for decomposing a crosslinked rubber, the method being characterized by including: a first decomposition step for carrying out decomposition using a catalyst represented by general formulae (1) to (3): [In the formulae, M is ruthenium, molybdenum, or the like, X1 and X2 and L1, L2 and L3 each independently denote a ligand, R1, R2 and R3 each independently denote hydrogen, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, or the like (here, these groups may be substituted with one or more alkyl groups, halogens, alkoxy groups, or the like), and L1 and L2, R1 and R2 or L1 and R1 may bond to each other to form a ring]; and a second decomposition step in which the decomposition product obtained in the first decomposition step is thermally decomposed at 300-450°C in an inert gas atmosphere in the absence of a catalyst.

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HOJO MASAHIRO (JP)
OKUNO AKIRA (JP)
KUNO MARINO (JP)
YOSHIOKA TOSHIAKI (JP)
KUMAGAI SHOGO (JP)
FUKAYA NORIHISA (JP)
WAHYU SATPRIYO PUTRO (JP)
CHOI JUN-CHUL (JP)
MIFTAH FARIED (JP)
YAMASHITA HIROSHI (JP)
FUJITANI TADAHIRO (JP)
HATORI MAKIKO (JP)
SUGIKI MAKOTO (JP)

PCT/JP2023/003873

August 17, 2023

February 06, 2023

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BRIDGESTONE CORP (JP)
UNIV TOHOKU (JP)
AIST (JP)

C08J11/18; B01J31/22; B01J31/24; C08C19/08; C08J11/12

WO2014148612A1

2014-09-25

CN110922510A	2020-03-27
US5446102A	1995-08-29
US20060116431A1	2006-06-01
JP2009106929A	2009-05-21
JPH07316227A	1995-12-05

SMITH R. F., BOOTHROYD S. C., THOMPSON R. L., KHOSRAVI E.: "A facile route for rubber breakdown via cross metathesis reactions", GREEN CHEMISTRY, ROYAL SOCIETY OF CHEMISTRY, GB, vol. 18, no. 11, 3 March 2016 (2016-03-03), GB , pages 3448 - 3455, XP093083687, ISSN: 1463-9262, DOI: 10.1039/C5GC03075G
CRAIG S W, ET AL: "Highly efficient acyclic diene metathesis depolymerization using a ruthenium catalyst containing a N-heterocyclic carbene ligand", MACROMOLECULES, AMERICAN CHEMICAL SOCIETY, US, vol. 34, 1 January 2001 (2001-01-01), US , pages 7929 - 7931, XP002303492, ISSN: 0024-9297, DOI: 10.1021/ma011188p
SADAKA FATEN; CAMPISTRON IRÈNE; LAGUERRE ALBERT; PILARD JEAN-FRANÇOIS: "Telechelic oligomers obtained by metathetic degradation of both polyisoprene and styrene–butadiene rubbers. Applications for recycling waste tyre rubber", POLYMER DEGRADATION AND STABILITY, BARKING, GB, vol. 98, no. 3, 28 December 2012 (2012-12-28), GB , pages 736 - 742, XP028577456, ISSN: 0141-3910, DOI: 10.1016/j.polymdegradstab.2012.12.018

SUGIMURA Kenji (JP)

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