Abstract: The present invention relates to a biodegradable copolyester of high molecular weight and narrow molecular weight distribution. The copolyester has a Mw of 100,000-600,000 g/mol, and a molecular weight distribution of 1.2-3.

Abstract: The invention relates to a multiple beam charged particle optical system, comprising an electrostatic lens structure with at least one electrode, provided with apertures, wherein the effective size of a lens field effected by said electrode at a said aperture is made ultimately small. The system may comprise a diverging charged particle beam part, in which the lens structure is included. The physical dimension of the lens is made ultimately small, in particular smaller than one mm, more in particular less than a few tens of microns. In further elaboration, a lens is combined with a current limiting aperture, aligned such relative to a lens of said structure, that a virtual aperture effected by said current limiting aperture in said lens is situated in an optimum position with respect to minimizing aberrations total.

Abstract: The present invention relates to a biodegradable, random and linear copolyester of high molecular weight and narrow molecular weight distribution, and to process for preparing it and use of the same. The present copolyester has a weight-average molecular weight Mw of 100,000-600,000 g/mol, and a molecular weight distribution of 1.2-3. The copolyester is widely used in the fields of profiles, films, fibers and coatings.