OLIGOMERS WITH PERFLUOR ALKYL END GROUPS THAT CONTAIN MERCAPTO GROUPS, PROCESS FOR THEIR PREPARATION AND THEIR USE AS SUFACE-ACTIVE SUBSTANCES AND AS ADDITIVES IN FIRE-EXTINGUISHING COMPOSITIONS

摘要

1. An oligomer of the formula Rf -E-S-[M1 ]-x -[M2 ]-y H wherein Rf is a straight or branched chain perfluoroalkyl of 4 to 18 carbon atoms, perfluoroalkyloxyalkylene of 5 to 19 carbon atoms, or mixtures thereof, E is a straight or branched chain alkylene of 1 to 12 carbon atoms, -CON(R')-E'-, -SO2 N(R')-E'-, -E"-CON(R')-E'-, -E"-S-E'-, -E"N(R')-E ; or -E"-SO2 N(R')-E'-, where R' is hydrogen or alkyl of 1 to 6 carbon atoms, E' is alkylene of 2 to 8 carbon atoms and E" is alkylene of 1 to 4 carbon atoms ; -[M1 ]- represents a hydrophilic monomer unit derived from a hydrophilic vinyl monomer and -[M2 ]- represents a hydrophobic monomer unit derived from hydrophobic vinyl monomer, x is an integer of 4 to 500, y is zero or an integer of up to 250, the sum of x and y is between 4 and 500 ; and x/x + y is between 1 and 0.5.