Block copolymer grafting process

Details Block copolymer grafting process Block copolymer grafting process

1989-08-24

1990-10-02

Short, Patricia

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

Synthetic resins

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

525 92, 525171, 525242, 525314, 525316, C08F 810, C08C 1928

Patent

active

049608312

ABSTRACT:
Elastomeric polymers comprising at least one alkali metal atom are modified by incorporating at least one group capable of sterically hindering coupling reactions which frequently occur when functional groups are subsequently incorporated into such polymers. In general, the group capable of sterically hindering coupling reactions may be incorporated by reacting the elastomeric polymer comprising at least one alkali metal atom with a compound containing a group capable of reacting with the elastomeric polymer at one end and at least one pendant group larger than hydrogen at the other. Groups that will react with elastomeric polymers comprising at least one alkali-metal atom are of course, well known, in the art, and include groups containing sulfur, oxygen, nitrogen and the like and ethylenically and acetylenically unsaturated groups. Compounds containing terminal ethylenically unsaturated groups are particularly useful in preparing the modified elastomeric polymers of this invention. Terminal groups capable of sterically hindering coupling reactions, generally, include all groups larger than hydrogen. Hydrocarbon groups are, however, particularly useful since these generally do not alter the properties which are characteristic of the elastomeric polymers. Aromatic groups containing at least 6 carbon atoms or cyclic hydrocarbon groups containing at least 5 carbon atoms are particularly effective. 1,1-diphenyl ethylene is particularly preferred in the present invention. Elastomeric polymers which have been modified in accordance with this invention may then be functionalized with less risk of undesirable coupling.

REFERENCES:
patent: 3005807 (1961-10-01), Schutze
patent: 3448176 (1969-06-01), Balas
patent: 3632681 (1972-01-01), Pope
patent: 3912793 (1975-10-01), Horiie
patent: 4068050 (1978-01-01), Danzig
patent: 4687815 (1987-08-01), Wong

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