摘要:
Described is a method for preparing a polybenzazole filament which comprises extruding a polybenzazole dope filament, drawing the filament across an air gap, coagulating and washing the filament, and drying the filament, characterized in that a solution of a compound selected from the group consisting of ferrocenes, ruthocene, iodide-, cobalt-, and copper-containing compounds, dyes, and mixtures thereof is contacted with a filament subsequent to the washing step and prior to the drying step. This method provides a means to improve the tensile strength retention of damaged polybenzazole filaments following exposure to sunlight.
摘要:
A fireproof linear aromatic polyester having a high stability to ultraviolet rays and heat contains a unit of the formula: ##STR1## WHEREIN R.sub.1 and R.sub.2 are each a straight or branched alkylene group having 1 to 5 carbon atoms and n.sub.1 and n.sub.2 are each an integer of from 1 to 4. The addition of an organic pentavalent phosphorus compound may improve the fireproof properties of products prepared from said polyesters.
摘要:
A polyester composition having high fireproofness is obtained by blending a copolymerized polyester comprising a polyalkylene terephthalate containing in the main chain thereof binding units of the formula: ##STR1## (WHEREIN, Y denotes -O-, an alkylidene radical having 1 to 6 carbon atoms or a cycloalkylidene radical having 3 to 6 carbon atoms) with a high molecular weight organic phosphorus compound of the formula: ##STR2## (WHEREIN, R.sub.1 denotes a monovalent hydrocarbon radical of 1 to 18 carbon atoms having or not having one or more substituents, R.sub.2 denotes a divalent hydrocarbon radical of 2 to 20 carbon atoms having or not having one or more substituents, x and z each denote 0 or 1 and n denotes an integer having the value of not less than 3) in an amount corresponding to 0.05 to 1.0% by weight of phosphorus atoms.