Process for hydrogenating block copolymers

Details Process for hydrogenating block copolymers Process for hydrogenating block copolymers

2006-05-30

2006-05-30

Teskin, Fred (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...

C525S332900, C525S940000, C528S482000, C528S485000

Reexamination Certificate

active

07053156

ABSTRACT:
Disclosed is a process for hydrogenating a block copolymer comprising admixing a block copolymer cement with hydrogen in the presence of a heterogeneous hydrogenation catalyst wherein the heterogeneous hydrogenation catalyst is a metal catalyst on a porous alumina support, the porous alumina support having the properties: (a) from about 40 to about 60 percent of the pore volume of the support have a diameter greater than 1000 nm; (b) from about 50 to about 70 percent of the pore volume of the support have a diameter greater than 100 nm; and (c) the support has a multi-modal pore structure with from about 5 to about 20 percent of the total pore volume of the porous alumina support being within a pore mode having a diameter in the range of from about 3000 nm to about 5000 nm. It is also disclosed that alumina can be used to remove a polymerization catalyst, such as Lithium, from a block copolymer cement.

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