A process for reducing the amount of volatile and semi-volatile organic substances of a polypropylene composition to below 150 μg/g (VOC, VDA 278 October 2011) and below 350 μg/g (FOG, VDA 278 October 2011).

A process for reducing the amount of volatile and semi-volatile organic substances of a polypropylene composition to below 150 μg/g (VOC, VDA 278 October 2011) and below 350 μg/g (FOG, VDA 278 October 2011).

Provided is a method of preparing a graft polymer, which includes: polymerizing a monomer mixture comprising a carboxylic acid monomer and methyl acrylate, wherein the carboxylic acid monomer is included at 1.5 to 2.5 wt %, and thus preparing an acrylic coagulant having an average particle diameter of 60 to 70 nm; polymerizing diene-based monomers in the presence of an emulsifier containing a salt of a compound and thus preparing a first diene-based rubber polymer; enlarging the first diene-based rubber polymer using the acrylic coagulant and thus preparing a second diene-based rubber polymer; and graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to the second diene-based rubber polymer and thus preparing a graft polymer.

Provided is a method of preparing a graft polymer, which includes: polymerizing a monomer mixture comprising a carboxylic acid monomer and methyl acrylate, wherein the carboxylic acid monomer is included at 1.5 to 2.5 wt %, and thus preparing an acrylic coagulant having an average particle diameter of 60 to 70 nm; polymerizing diene-based monomers in the presence of an emulsifier containing a salt of a compound and thus preparing a first diene-based rubber polymer; enlarging the first diene-based rubber polymer using the acrylic coagulant and thus preparing a second diene-based rubber polymer; and graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to the second diene-based rubber polymer and thus preparing a graft polymer.

The devolatilization of plastomer pellets is undertaken using nitrogen that is recycled in the process. Volatile hydrocarbons are removed from the nitrogen in a hydrocarbon extraction vessel (e.g. an adsorbent bed). In an embodiment, the recycled nitrogen contains less than 300 ppm of volatile hydrocarbons after being treated in the adsorbent bed.

The devolatilization of plastomer pellets is undertaken using nitrogen that is recycled in the process. Volatile hydrocarbons are removed from the nitrogen in a hydrocarbon extraction vessel (e.g. an adsorbent bed). In an embodiment, the recycled nitrogen contains less than 300 ppm of volatile hydrocarbons after being treated in the adsorbent bed.

One aspect of the present invention is a method for producing an ethylene vinyl acetate hot-melt adhesive, comprising: introducing a liquid including at least one of water and alcohol into a heating kneader while or after kneading a hot-melt adhesive material in a liquid state, at an amount of 0.05 parts by mass or more with respect to 100 parts by mass of the hot-melt adhesive material; and performing vacuuming while heating stirring or dispersing the hot-melt adhesive material and the liquid so as to come into contact with each other.

One aspect of the present invention is a method for producing an ethylene vinyl acetate hot-melt adhesive, comprising: introducing a liquid including at least one of water and alcohol into a heating kneader while or after kneading a hot-melt adhesive material in a liquid state, at an amount of 0.05 parts by mass or more with respect to 100 parts by mass of the hot-melt adhesive material; and performing vacuuming while heating stirring or dispersing the hot-melt adhesive material and the liquid so as to come into contact with each other.

A deodorization method and apparatus are disclosed to eliminate, reduce or correct the odour of incoherent plastics, i.e. in the form of granules and/or microgranules and/or powder and/or flakes or the like, with a container of the incoherent plastics, an actuator for generating a process gas flow from a gas inlet to a gas outlet of said container, an olfactory sensor arranged to detect odorous emissions in the process gas exiting from said container, a controller configured to control at least one parameter of the process gas on the basis of an odour intensity measured by said olfactory sensor, with the aim of eliminating the substances that cause undesired odours from the incoherent plastics that is usable in a transformation process to make an end product.

The invention relates to a purification method for purifying a vinylidene fluoride polymer comprising at least one impurity, the method comprising the following steps: washing of the vinylidene fluoride polymer with a stream of supercritical fluid; and extraction of residual supercritical fluid from the vinylidene fluoride polymer.

The invention also relates to a vinylidene fluoride polymer, a fluid conveyance part comprising or consisting of said polymer; as well as the use of said fluid conveyance part.