Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-11-07
2009-12-01
Nutter, Nathan M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S250000, C525S327300, C525S331900, C525S332600, C525S332800, C525S333100
Reexamination Certificate
active
07625983
ABSTRACT:
A process for the preparation of a functionalized, coupled or starred block copolymer which is usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, one at least of said blocks consisting of a polyisoprene and at least one other block consisting of a diene elastomer other than a polyisoprene the molar ratio of units originating from one or more conjugated dienes of which is greater than 15%. The process includes the steps of: (i) copolymerization of one or more monomers comprising a conjugated diene other than isoprene using a catalytic system comprising a hydrocarbon solvent, a compound A of a metal of group IIIA, a compound B of an alkaline-earth metal and a polymer initiator C comprising a C—Li bond which is formed of a monolithiated polyisoprene intended to form the polyisoprene, said polyisoprene block(s) having a number-average molecular weight Mn1of between 2,500 and 20,000 g/mol, so that said block(s) other than a polyisoprene has/have a content of trans-1,4 linkages equal to or greater than 70% and a number-average molecular weight Mn2of between 65,000 and 350,000 g/mol, and (ii) addition to the product of copolymerization of a functionalizing, coupling or starring agent comprising one, two or at least three epoxy groups respectively, so that said block other than a polyisoprene is functionalized, coupled or starred.
REFERENCES:
patent: 4080492 (1978-03-01), de Zarauz
patent: 4092268 (1978-05-01), de Zarauz
patent: 4129705 (1978-12-01), de Zarauz
patent: 5134199 (1992-07-01), Hattori et al.
patent: 5773524 (1998-06-01), Coolbaugh et al.
patent: 6133376 (2000-10-01), Hsieh et al.
patent: 6150487 (2000-11-01), Zhang et al.
patent: 6624267 (2003-09-01), Favrot et al.
patent: 6800582 (2004-10-01), Favrot et al.
patent: 7205360 (2007-04-01), Robert et al.
patent: 2003/0212223 (2003-11-01), Favrot et al.
patent: 0856522 (1998-08-01), None
patent: 1018521 (2000-08-01), None
patent: 1516861 (1975-12-01), None
patent: 1525381 (1978-09-01), None
patent: 2333298 (1999-07-01), None
patent: WO 03/037946 (2003-05-01), None
Buchanan & Ingersoll & Rooney PC
Michelin-Recherche et Technique S.A.
Nutter Nathan M
LandOfFree
Process for the preparation of block copolymers for tire... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of block copolymers for tire..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of block copolymers for tire... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4140608