| abstract |
A plasticized cellulose acetate is described with a content of a modified cellulose acetate A comprising a grafted oligomer of a cyclic ester, in particular in the form of epsilon -caprolactone, which comprises additionally a plasticizing agent in the form of an oligomer B of a cyclic ester, and the terminal carboxyl group of the oligomer is esterified with an alcohol or an alcohol derivative having at least one free hydroxyl group, with a boiling point of at least approximately 120 DEG C. and a melting point of no more than approximately 180 DEG C. and the ratio of weight of component A to B is represented by the formula (I) 0.3</=A/(A+B)</=0.95(I). This plasticized cellulose acetate can be produced advantageously for example when an oligomer B in the form of the reaction product of a cyclic ester, in particular in the form of epsilon -caprolactone, and a monofunctional and/or polyfunctional alcohol and/or an alcohol derivative comprising at least one free hydroxyl group, is reacted in the melt in the presence of a catalyst with a cellulose acetate comprising hydroxyl groups. This process is economical. Relative to known products, the product of this process exhibits a lower melting point and can be used for the production of filaments by spinning from the melt. |