Homo- and co-polythioureas having recurring units of the formula: ##SPC1## Wherein R is hydrogen or methyl, are useful in the preparation of shaped articles (particularly fibers).
Thermally-reversible polymer compositions, and method of preparing said compositions, comprising amine-modified polymer cross-linked with thiourea units of the formula ##SPC1## In which R is an organic radical in which a non-aromatic carbon atom is linked to the adjacent nitrogen atoms, R' is hydrogen, aliphatic or cycloaliphatic group and n is an integer of 1 or more, are described.
Ether-linked amine-terminated polyethers are produced by reacting (1) a polyether polyol in which substantially all of the hydroxyl groups have been replaced with good leaving groups with (2) an aminoalcohol and/or aminothiol and (3) a deprotonating agent. The aminopolyethers obtained by this process are characterized by low viscosities and excellent reactivities over a wide range of molecular weights and functionalities.
