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
2004-08-12
2009-10-27
Rábago, Roberto (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...
C526S169000, C526S281000, C526S283000, C526S336000
Reexamination Certificate
active
07608671
ABSTRACT:
A norbornene ring-opened polymer hydrogenated product having a syndiotactic structure and a process for producing the same are disclosed. The ring-opened polymer hydrogenated product contains a repeating unit originating from a polycyclic norbornene monomer with three or more rings in the polymer repeating units, having a weight average molecular weight of 500 to 1,000,000, and having a racemo diad proportion of 51% or more. The process comprises a step of polymerizing a polycyclic norbornene monomer having three or more rings by solution polymerization using a group 6 transition metal compound with a hydroxyl group-containing aryloxy group or the like bonded thereto as a polymerization catalyst to obtain a ring-opened polymer and a step of hydrogenating double bonds in the main chain of the ring-opened polymer.
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Hayano et al., “Stereospecific Ring-Opening Metathesis Polymerization of Cycloolefins Using Novel Molybdenum and Tungsten Complexes Having Biphenoalte Ligands. Development of Crystalline Hydrogenated Poly (endo-dicyclopentadiene) and Poly (norbornene)”, Macromolecules, vol. 36, pp. 7422-7431, XP002481951, Aug. 29, 2003.
Hayano Shigetaka
Tsunogae Yasuo
Birch & Stewart Kolasch & Birch, LLP
Rábago Roberto
Zeon Corporation
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