Abstract: A process for the preparation of a thin film having at least one layer of a predetermined thickness not exceeding 5 microns is provided such that the integrity of the thin film is preserved. The process for the preparation of such a thin film comprises the step of rolling at least one sheet. The step of rolling is preceded by a step of stacking at least one sheet on a substrate having a predetermined thickness. The process of stacking preferably includes the step of bonding at least one sheet to a substrate. The sheet is a metal, alloy or a combination thereof, the metal and the alloy being of metals selected from the groups IB, IIB, IIIA, IVA, IVB, VB and VIB.

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?—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).