Coupled polymers and process for preparing the same

Details Coupled polymers and process for preparing the same Coupled polymers and process for preparing the same

1998-12-07

2000-10-24

Seidleck, James J.

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

Synthetic resins

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

525108, 525 98, 525423, C08F 0808

Patent

active

061369217

ABSTRACT:
The present invention provides a coupled polymer, which is prepared by reacting a living alkali metal-terminated polymer with a particular coupling agent. The coupling agent has the formula ##STR1## where R1, R3 are independently selected from the group consisting of aliphatic alkyl and alkenyl, and hydrogen, and R.sub.2 is alkylene, alkenylene, divalent cycloalkylene, divalent arenyl, or a C.sub.1-17 divalent hydrocarbyl containing ether or ketone group. By means of the particular coupling agent, the coupling efficiency is relatively high, and no harmful materials will be generated to corrode the pipes. The coupled polymer obtained has a coupling number of less than 3, and good rubbery physical properties, transparency, and wear resistance.

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Preliminary Search Report, Republic of France, Aug. 11, 1999 for application Nos. FA 566749 and FR9816043.

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