| abstract |
Synthetic fibres, films &c. containing a polyoxymethylene are made by shaping a mixture of (A) 10 to 98% by weight of a high molecular weight polyoxymethylene and (B) 90 to 2% by weight of a substance of melting point below 250 DEG C., which substance may be (i) a homopolymer, (ii) a copolymer with another copolymerizable monomer, (iii) a homopolymer or copolymer saponification product, (iv) a homopolymer or copolymer saponification product derivative (or two or more of types (i) to (iv)) of an organic acid vinyl ester. The polyoxymethylene may have a molecular weight of at least 10,000. Its terminal -OH groups may be modified by esterification, etherification or urethanization. Substance (i) may be chosen from list A or from list B. Substance (iii) may be a saponification product of a substance of List A or List B. Substance (iv) may be chosen from list C. In examples polyoxymethylene diacetate is used and in one example polyoxymethylene dimethyl ether mixed with benzalized polyvinyl alcohol. In the examples in which polyoxymethylene diacetate is used the other component is either formalized ethylenevinylacetate copolymer, polyvinyl alcohol which has been reacted with formaldehyde and -aminobutyraldehyde, formalized polyvinyl alcohol, polyvinyl formate, or an ethylene-vinyl alcohol copolymer. |