| 摘要 |
<p>The invention relates to a process for making a modified thermoplastic polyester by reacting a thermoplastic polyester with a nitrogen-containing compound, wherein the thermoplastic polyester is first contacted in the solid state with an inert gas atmosphere containing at least one amino-compound of formula H2N-R-(X)n, wherein n is an integer ≥ 0, R = a linear, branched or cyclo-aliphatic or aromatic residue comprising 1-24 C-atoms and optionally containing hetero atoms, X= -NH2 or another functional group reactive with the polyester, at a temperature T(a) between room temperature and the melting point Tm of the polyester, during at least 1 s; and then heated to a temperature T(b) between T(a) and Tm, during up to 10 hours; and thereafter solid state polymerised at a temperature T(c) between (Tm-50) and Tm, during up to 100 hours, where T (a) < T (b) < T (c). The process according to the invention allows making a modified thermoplastic polyester in a relatively simple way, and can easily be applied to an existing polyester polymerisation process, such that in addition to an unmodified thermoplastic polyester, a modified thermoplastic polyester can be produced starting from the same existing pre-polymer. With the process according to the invention properties like the crystallisation behaviour can be adjusted in a customized way. Depending on the type of amino-compound that is used, a thermoplastic polyester with higher or lower crystallisation rate may be made, whereas the amount of amino-compound used affects the degree of (crystallisation) modification. Also other properties of the thermoplastic polyester may be modified, like its rheological behaviour or its dyeability.</p> |
