초록 ▼

Disclosed is a multi-layer gas-barrier drawn polyester vessel, which comprises an open end portion, a barrel portion which is molecularly oriented in at least one axial direction and a closed bottom portion, said vessel having inner and outer layers composed of a thermoplastic polyester or copolyest

Disclosed is a multi-layer gas-barrier drawn polyester vessel, which comprises an open end portion, a barrel portion which is molecularly oriented in at least one axial direction and a closed bottom portion, said vessel having inner and outer layers composed of a thermoplastic polyester or copolyester and a gas-barrier intermediate layer composed of an ethylene/vinyl alcohol copolymer having an ethylene content lower than 50 mole %, wherein a copolymer nylon resin or a blend of a plurality of nylon resins is interposed as an adhesive between two adjacent layers.

대표청구항 ▼

A process for the preparation of a multi-layer gas-barrier drawn polyester bottle, which comprises (i) forming by co-extrusion a multi-layer pipe comprising (a) outer and inner layers of polyethylene terephthalate, (b) a gas-barrier intermediate layer of an ethylene-vinyl alcohol copolymer having an

A process for the preparation of a multi-layer gas-barrier drawn polyester bottle, which comprises (i) forming by co-extrusion a multi-layer pipe comprising (a) outer and inner layers of polyethylene terephthalate, (b) a gas-barrier intermediate layer of an ethylene-vinyl alcohol copolymer having an ethylene content of 15 to 50 mole % and (c) adhesive layers interposed between the gas-barrier intermediate layer and each of the outer and inner layers, each of said adhesive layers consisting of a nylon 6/nylon 6,6 copolymer having a nylon 6 content of 50 to 93 mole % and having a relative viscosity (h1.8 to 3.5 as measured at 20°C. with respect to a solution of 1 gram of the polymer in 10 cc of 98% sulfuric acid, and the copolyamide adhesive having such characteristics that the peel strength between the polyethylene terephthalate layer and the ethylene-vinyl alcohol copolymer layer is 20 to 800 g/20 mm of the width in the state of a bottle, (ii) forming a neck portion at one end of the multi-layer pipe and forming a bottom at another end of the multi-layer pipe to form a bottomed preform, and (iii) draw-blowing the bottomed preform to form a bottle molecularly oriented biaxially in the axial direction and hoop direction.