Process for improving the color of selectively hydrogenated bloc

Details Process for improving the color of selectively hydrogenated bloc Process for improving the color of selectively hydrogenated bloc

1993-07-29

1995-04-11

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525301, 525338, C08F26704

Patent

active

054059143

ABSTRACT:
A process for improving the color of selectively hydrogenated block copolymers modified with acid compound or derivatives thereof which comprises:
(a) anionically polymerizing at least one conjugated diene, and, optionally, at least one vinyl aromatic hydrocarbon, to produce a block copolymer,
(b) selectively hydrogenating the block copolymer,
(c) subjecting the block copolymer to an acid wash,
(d) subjecting the acid washed block copolymer to high efficiency water washing at a residence time of not less than 50 minutes and a water to polymer cement weight ratio of more than 0.2, and
(e) grafting an acid compound or a derivative thereof onto the block copolymer.

REFERENCES:
patent: Re27145 (1971-06-01), Jones
patent: 3792005 (1974-02-01), Harlan
patent: 4134928 (1979-01-01), Moczygemba
U. K. Search Report dated 4 Nov. 1994.

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