The invention relates to a solid catalyst system comprising a chromium compound, a metal compound, an aluminium compound and a silicon oxide support, wherein the silicon oxide support has an average particle diameter in the range between ≥20 and ≤50 μm, a pore volume in the range between ≥1.7 ml/g and ≤3 ml/g, and a surface area in the range between ≥400 m.sup.2/g and ≤800 m.sup.2/g, and wherein the aluminium alkoxide compound has the formula

R.sub.1—Al—OR.sub.2

wherein R.sub.1 is selected from (C.sub.1-C.sub.8) alkyl groups and OR.sub.2 is selected from (C.sub.1-C.sub.8) alkoxyl groups.

A tank including a liner; a reinforcing layer formed of fiber reinforced resin that is arranged on the liner; a label arranged on the reinforcing layer; and a surface layer formed of glass fiber reinforced resin that is arranged to cover the label. The reinforcing layer includes an inner layer, and an outer layer having a cover rate smaller than the inner layer and smaller than 100%, the cover rate being a percentage of a volume occupied by the fiber reinforced resin in space of the reinforcing layer, and the outer layer being arranged on the inner layer, and at least a part of the label is embedded in the reinforcing layer.

A fabric and elastomeric material (referred to as a fabric trilayer) combined with a sealant may be applied in such a fashion so as to eliminate or minimize air entrapment in an elastomeric composite structure that forms a seal-sealing volume. The performance of the self-sealing volume is dramatically improved with this minimizing of air entrapment. Surprisingly and unexpectedly, this construction approach may be accomplished without significantly adding to the weight or thickness of the volume and without affecting the outer dimension of the self-sealing volume. Thus, a method and system for forming a self-sealing volume are described. The system includes an elastomeric composite structure comprising at least one layer of an elastomeric material derived from a neat (no solvent) elastomeric material that does not substantially react at room temperature.

A support for connecting the upper and lower surfaces inside a fuel tank includes a connecting column. Each of the upper and lower sides of the connecting column is provided with an end surface. The end surface is coated with plastic. The connecting column is provided with a notch, and the number of the connecting column is at least one. The connecting column is configured in an I-shape, an H-shape, an M-shape, a W-shape or other shapes. The shape of the notch is V-shaped, U-shaped, semicircular or irregular. The notch is provided on a left side or a right side of the connecting column or in a middle of the connecting column.

Provided is a fuel tank made of resin, including: a fuel tank body that is enclosed by a bottom wall, side walls, and an upper wall, the fuel tank body including a first storage portion, a second storage portion, and a coupling portion, the coupling portion communicating an upper portion of the first storage portion and an upper portion of the second storage portion; a pump module disposed in the first storage portion; an open portion formed in the first storage portion; a strut provided in the first storage portion; a separator provided on the strut; a suction portion disposed in the second storage portion; a fuel transfer line that communicates the suction portion to the pump module; a holding portion and a provisional holding portion provided at the separator, the provisional holding portion being configured to removably hold the extra-length portion of the fuel transfer line.

A fuel container having walls defining a space in which fuel is to be contained, a layer of deformable material bonded to the external surfaces of the container walls, and a self-sealing layer of fuel-activated swellable material bonded to the deformable material, wherein said self-sealing layer is a latex foam, in particular a natural rubber latex foam, comprising a non-ionic associative thickener as rheology modifier and optionally other additives such as foam enhancers, foam stabilizers, accelerators and vulcanization components.

The present invention proposes a fuel tank comprising at least two shells weldable together, each of said at least two shells is made of a polymer composition comprising at least 45% by weight of at least one aromatic polyamide and at least 10% by weight of at least one aliphatic polyamide relative to the total weight of the polymer composition.

The invention relates to a method for producing a liquid con-tainer (2) for a motor vehicle, which is assembled from at least two shells (4, 6). Furthermore, the invention relates to a liquid container (2) for a motor vehicle.

A refueling port is provided and includes: a refueling port main body made of resin; an inlet fitting formed in a tubular shape and arranged at an inlet opening of the refueling port main body; a resin cover formed in a tubular shape, molded separately from the inlet fitting, mounted on the outer peripheral side of the inlet fitting, and fitted to the refueling port main body; and a ground fitting formed in a long shape and connected to the inlet fitting. The ground fitting includes: an exposed portion arranged to face the outer peripheral surface of the cover; and an insertion portion formed by folding back from a first end of the exposed portion on the inlet side, sandwiched between the outer peripheral surface of the inlet fitting and the inner peripheral surface of the cover, and coming into contact with the outer peripheral surface of the inlet fitting.

A liquid vehicle tank (1) having a wall made of a plastic material, the tank (1) comprising a component (3, 5) affixed to the wall, the component (3, 5) having a portion (10) embedded in the wall, the embedded portion (10) having an external surface (21) a part of which is chemically incompatible with the plastic material of the wall, wherein the tank (1) also comprises a strengthening element welded to the wall over the embedded portion (10) of the component (3, 5).