Process for making a modified thermoplastic polyester

Details Process for making a modified thermoplastic polyester Process for making a modified thermoplastic polyester

2007-07-17

2007-07-17

Gulakowski, Randy (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C528S268000

Reexamination Certificate

active

10508034

ABSTRACT:
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═—NH2or another functional group reactive with the polyester, at a temperature T(a) between room temperature and the melting point Tmof 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 polymerized 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 polymerization 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 crystallization 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 crystallization rate may be made, whereas the amount of amino-compound used affects the degree of (crystallization) modification. Also other properties of the thermoplastic polyester may be modified, like its rheological behavior or its dyeability.

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English translation of JP 02-279737.
Patent Abstracts of Japan, Abstract of JP 00 291 249, filed May 18, 1988.

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