ES328326A1 - A procedure for preparing a segmented polymer. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A process for preparing a long-chain, fiber-forming segmented polymer, in which the polymer molecules consist essentially of 50 to 95% by weight of periodic soft segments and 3 to 50% by weight of periodic hard segments, the soft and hard segments are bonded together by urethane linkages, the soft segments being the remainder that remains after separating the terminal functional groups from an amorphous polymer with a melting point below 60º C and a molecular weight greater than 600, constituting the hard segments the rest of the polymeric molecules remaining between the urethane bonds and containing at least one repeated unit of a nitrogenous polymer which in its range of fiber-forming molecular steps has a melting point higher than about 200º C and in which The hard segments in the polymer molecules have the formula: ** (See formula) ** where Q is a radical obtained by removing a hydrogen atom from each of the two functional groups of a polyfunctional compound, Q and p being selected so that at least 90 mole% of the radicals within the brackets have the formula: ** (See formula) ** R is an organic radical containing more than 1 carbon atom and is free of substituents that react with the isocyanate, with at least 55 mole% of the radicals R of formula: ** (See formula) ** where R "is selected from the group consisting of methyl, ethyl and n-propyl, X is a radical selected from (a) p-phenylene, (b) p-xilileno, (c) 1,4-cyclohexylene, (d) 4-,4'-bifenileno, (e) 1,4-naftileno, (f) 1,5-naftileno, (g) 2,6-naftileno, (h) (see formula) where -Y- is selected from the class consisting of -CH2-, -CH2-CH2-, -O-, (ver fºrmula), -S-, -SO- y -SO2-, e (i) radicals as defined in (a), (b), (c), (d), (e), (f), (g) and (h) having at least one substituent in the ring the class formed by methyl, methoxy and ethyl; q is a positive integer from 1 to 8 approximately; and p is zero or 1, wherein said process is characterized by reacting a difunctional polymer with a molecular weight of between about 600 and 5000 and an excess molar amount of a polyisocyanate, said polyisocyanate containing at least part of one or more hindered tertiary compounds, with a chain extender containing, at least in part, 1,3-diaminocyclohexane. (Machine-translation by Google Translate, not legally binding)