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
2007-03-06
2007-03-06
Choi, Ling-Sui (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S332800, C525S333200, C525S940000, C502S103000, C502S117000, C502S152000
Reexamination Certificate
active
11086915
ABSTRACT:
A process for hydrogenation of an unsaturated polymer. The conjugated diene polymer in an inert organic solvent is brought into contact with hydrogen in the presence of a hydrogenation catalyst composition to selectively hydrogenate the unsaturated double bonds in the conjugated diene units of the conjugated diene polymer. The hydrogenation catalyst composition includes: (a) a titanium compound; (b) a compound represented by formula (II) or formula (III):wherein L1is a Group IVA element, L2is a Group IVA element, R3is C1–C12alkyl or C1–C12cycloalkyl, R4is C2–C12alkyl or C3–C12cycloalkyl, and X1, X2, and X3can be the same or different and are C1–C12alkyl, C1–C12alkoxy, C1–C12cycloalkoxy, phenyl, or phenoxy; and (c) a trialkylaluminum compound.
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Lin Fu
Liu Shun-An
Tsai Chih-Kuang
Tsai Jing-Cherng
Birch, Stewart, Kolasch & Stewart, LLP
Choi Ling-Sui
TSRC Corporation
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