| 摘要 |
An elastomer consists essentially of 40 to 60 wt. per cent units (a) -O-G-O-, 5 to 25% units (b) -O-B-O- and 2 to 5 wt. per cent units (c) -D- all connected through the radical (d) -CO-Z-CO- and includes a polyamide segment (-D-CO-Z-CO-)n, where n>1. G and B are radicals obtained by removing the OH groups from (G) a polyether glycol of M.W. 800 to 3000 and (B) a glycol of M.W.<200; D is -CH2-CH2- or -(CH2)4-; and Z is a bivalent radical resulting from removal of amine hydrogens from piperazine or 2-methyl, 2,5-dimethyl or 2,3,5,6-tetra methyl piperazine. They may be prepared by reacting a diamine H-Z-H with the bishaloformates of the glycols HO-G-OH and HO-B-OH and the halide of the acid D-(COOH)2, e.g. by a solution/interfacial technique employing an aqueous solution of an acid acceptor and an inert water-immiscable solvent capable of dissolving the reaction product such as a halo-alkane. The elastomers may be compound with various conventional compounding ingredients, e.g. antioxidants, light stabilizers, pigments, fillers and plasticizers, and may be mixed with other polymers, e.g. polyamides, vinyl polymers and fluorocarbon polymers and telomers and may be shaped by various processes. They may also be used in the melt or solution as textile-treating materials or adhesives. Polyisocyanates are incorporated in the solvent adhesives. Various moulded and other articles which may be made from the elastomers are mentioned.
|
