Polypropylene composition comprising a polypropylene base material, a carbon fibre and an adhesion promoter with an excellent impact/stiffness balance, its preparation, articles comprising the composition and the use of the composition.

A multilayer tube is provided which includes a layer including a specific aliphatic polyamide composition and a layer including a semi-aromatic polyamide composition including a semi-aromatic polyamide with a specific structure, these layers being adjacent to each other, wherein the aliphatic polyamide composition includes an aliphatic polyamide having a specific ratio of the number of methylene groups to the number of amide groups, a polyamide having a specific difference in absolute value of solubility parameter SP from the aliphatic polyamide, and an elastomer polymer including a structural unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.

A multilayer tube is provided which includes a layer including a specific aliphatic polyamide composition and a layer including a semi-aromatic polyamide composition including a semi-aromatic polyamide with a specific structure, these layers being adjacent to each other, wherein the aliphatic polyamide composition includes an aliphatic polyamide having a specific ratio of the number of methylene groups to the number of amide groups, a polyamide having a specific difference in absolute value of solubility parameter SP from the aliphatic polyamide, and an elastomer polymer including a structural unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.

The present invention relates to a polypropylene composite resin light diffusion plate. The polypropylene composite resin light diffusion plate obtained by mixing hollow spheres made of an inorganic material with an eco-friendly, inexpensive, low specific gravity polypropylene composite resin can improve thermal expansion characteristic (area expansion rate) to a level equal to or superior to those of polycarbonate (PC) and polystyrene (PS), enhance optical characteristics (transmittance, shielding rate), and reduce manufacturing costs. The polypropylene composite resin light diffusion plate according to the present invention is manufactured in a flat plate shape by mixing a plurality of hollow spheres with a polymer resin containing a polypropylene (PP) resin and has an area expansion rate of 0.4-0.7% at 60° C., relative to an area at room temperature, due to mutual bonding of the polypropylene (PP) resin and the plurality of hollow spheres by covalent bonding therebetween.

The present invention relates to a polypropylene composite resin light diffusion plate. The polypropylene composite resin light diffusion plate obtained by mixing hollow spheres made of an inorganic material with an eco-friendly, inexpensive, low specific gravity polypropylene composite resin can improve thermal expansion characteristic (area expansion rate) to a level equal to or superior to those of polycarbonate (PC) and polystyrene (PS), enhance optical characteristics (transmittance, shielding rate), and reduce manufacturing costs. The polypropylene composite resin light diffusion plate according to the present invention is manufactured in a flat plate shape by mixing a plurality of hollow spheres with a polymer resin containing a polypropylene (PP) resin and has an area expansion rate of 0.4-0.7% at 60° C., relative to an area at room temperature, due to mutual bonding of the polypropylene (PP) resin and the plurality of hollow spheres by covalent bonding therebetween.

The present disclosure provides a multilayer structure having a gas barrier layer and a polyurethane layer; a molded product having such a multilayer structure; and a method for producing the molded product.

The present disclosure provides a multilayer structure having a gas barrier layer and a polyurethane layer; a molded product having such a multilayer structure; and a method for producing the molded product.

A foamable polypropylene composition, and foamed polypropylene and a preparation method therefor are provided. The polypropylene composition comprises polypropylene, a polypropylene modifier, a foaming agent, and an optional nucleating agent. A preparation method for the polypropylene modifier comprises: enabling polar monomer grafted polypropylene to be in contact with a component A to react and carrying out extruding pelletizing, wherein a polar monomer in the polar monomer grafted polypropylene can chemically react with the component A; the polar monomer is selected from at least one of dimethylamino methacrylate, epoxy acrylate, trimeric acrylic isocyanurate, and acrylamide; and the component A is selected from at least one of polyisocyanate, polyethylene oxide, and an amido-containing substance. The foamed polypropylene has an obtained foaming ratio of 12 times or more, and also has high tensile and flexural properties.

A foamable polypropylene composition, and foamed polypropylene and a preparation method therefor are provided. The polypropylene composition comprises polypropylene, a polypropylene modifier, a foaming agent, and an optional nucleating agent. A preparation method for the polypropylene modifier comprises: enabling polar monomer grafted polypropylene to be in contact with a component A to react and carrying out extruding pelletizing, wherein a polar monomer in the polar monomer grafted polypropylene can chemically react with the component A; the polar monomer is selected from at least one of dimethylamino methacrylate, epoxy acrylate, trimeric acrylic isocyanurate, and acrylamide; and the component A is selected from at least one of polyisocyanate, polyethylene oxide, and an amido-containing substance. The foamed polypropylene has an obtained foaming ratio of 12 times or more, and also has high tensile and flexural properties.

An object is to provide a chlorinated polyolefin resin composition being superior in adhesion, solution stability, and chipping resistance. The chlorinated polyolefin resin composition contains a component (A): a polyolefin resin A having a melting point (Tm.sub.A) obtained with a differential scanning calorimeter (DSC) in the range of 90 to 160° C., and a component (B): a polyolefin resin B having a melting point (Tm.sub.B) obtained with a differential scanning calorimeter (DSC) in the range of 50 to 130° C., at least any one of the component (A) and the component (B), or a copolymer thereof being a chlorinated polyolefin resin (where |Tm.sub.A−Tm.sub.B|≥5° C.).