1,4-Butanediol, 2,3-bis((gamma-omega-perfluoro-C4-18-alkyl)thio) derivs, polymers with 1,6-diisocyanato-2,2,4(or 2,4,4)-trimethylhexane and polyethylene-polypropylene glycol bis(2-aminomethylethyl) ether 68988-25-0