Process for producing hydrogenated petroleum resin

Abstract

A hydrogenated compound (hydrogenated petroleum resin) which is a molten resin from which a hydrogenation solvent has been separated in a hydrogenation-solvent removal step is examined for a near-infrared absorption spectrum, and the aromatic content, bromine number, and softening point which are the values of properties of the hydrogenated compound are calculated on the basis of calibration curve data. Operation conditions concerning at least one of the temperature, pressure, reaction time, and hydrogen amount within a hydrogenation reaction part (3) are controlled so as to reduce both the difference between the aromatic content determined by the near-infrared analysis and the aromatic content of hydrogenated-petroleum-resin pellets to be produced and the difference between the bromine number determined by the analysis and the bromine number of the pellets. At least the temperature or the pressure of a thin-film evaporator (42) is controlled so as to reduce the difference between the softening point determined by the near-infrared analysis and the softening point of the hydrogenated-petroleum-resin pellets to be produced.

Description

technical field [0001] The invention relates to a method for preparing hydrogenated petroleum resin. Background technique [0002] Hot-melt adhesives are widely used in the production and binding of paper diapers, various packaging, and the like. For example, examples of the hot-melt adhesive include styrene-butadiene-styrene block copolymer (Styrene-Butadiene-Styrene block copolymer: hereinafter referred to as SBS), styrene-isoprene-styrene block copolymer (Styrene-Isoprene-Styrene block copolymer: hereinafter referred to as SIS.), Ethylene Vinyl Acetate block copolymer (hereinafter referred to as EVA.), Amorphous Poly Alpha-Olefin (Amorphous Poly Alpha-Olefin: hereinafter referred to as APAO. )Wait. Hydrogenated petroleum resin is blended as a tackifier in this base polymer. [0003] For example, as described in Patent Document 1, a hydrogenated petroleum resin is produced by a hydrogenation treatment in which a polymer obtained by polymerizing styrene monomer and cyclo...

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Problems solved by technology

[0005] However, in the batch process where it is appropriate to repeat the operation of adjusting the production conditions according to the analysis results of the product particles in order to produce hydrogenated petroleum resin particles having desired physical properties, the operation is time-consuming and complicated, so it is desired to simplify the production management.

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