Abstract: An electro-optic method and device fabricated with a metastable phase of BTO. The metastable tetragonal crystalline phase of BTO is preserved using direct wafer bonding on a thick SiO2 lower cladding layer for optical confinement in the active BTO.

Abstract: Polyvinyl acetals are obtained in a cost-effective and environmentally advantageous manner by employing as at least a portion of the aqueous acetalization medium, the mother liquor from a previous acetalization reaction.

Abstract: The invention relates to a method for producing polyvinylacetals that can be obtained by saponifying a vinylester polymer and subsequently acetalizing the polyvinyl alcohol, which is obtained therewith, with one or more aldehydes selected from the group consisting of aliphatic and aromatic aldehydes having 1 to 15 C atoms, whereby: a) the polyvinyl alcohol is present in an aqueous medium; b) a pH value of <1 is set optionally by adding acid; c) the acetalization is initiated by adding the aldehyde constituent, and; d) the precipitated polyvinylacetal is separated from the filtrate by filtration. The inventive method is characterized in that 10 to 100% by weight of the aqueous medium consists of the filtrate of a previous preparation, and the filtrate produced in d) is optionally reused in another preparation.

Abstract: Modified polyvinyl acetals are prepared by saponification of 1-alkylvinyl acetate-vinyl acetate copolymers, which contain 1-alkylvinyl acetate/vinyl acetate in a weight ratio of 1/99-40/60 and subsequent acetalization the saponification products containing at least 80% units of vinyl alcohol and 1-alkyl vinyl alcohol with one or more aliphatic aldehydes with 1-6 C atoms under acid catalysis in an aqueous and/or organic medium; as well as to a method for the manufacture and the use thereof, especially in printing inks.