Laminate preform for a multi-layer polyester bottle

• US 4,741,936 A
• Filed: 12/02/1986
• Issued: 05/03/1988
• Est. Priority Date: 12/27/1983
• Status: Expired due to Fees

• Current Assignee: TOYO Seikan Kaisha Limited
• Original Assignee: TOYO Seikan Kaisha Limited
• Inventors: Sakano, Kozaburo, Matsuo, Junichi, Sugimoto, Takeshi, Nohara, Shigezo, Ohkubo, Yoshimichi
• Primary Examiner(s): Bueker, Richard R.
• Assistant Examiner(s): Seidleck, James J.
• Application Number:
  US06/937,177
• Time in Patent Office: 518 Days
• Field of Search: 215/1 C, 428/35, 428/36, 428/213, 428/215, 428/483, 428/542.8, 264/515
• US Class Current: 428/36.7
• CPC Class Codes: B29C 2949/072 having variable wall thickness
• CPC Class Codes: B29C 2949/0722 at neck portion
• CPC Class Codes: B29C 2949/0723 at flange portion
• CPC Class Codes: B29C 2949/0724 at body portion
• CPC Class Codes: B29C 2949/073 having variable diameter
• CPC Class Codes: B29C 2949/0731 at neck portion
• CPC Class Codes: B29C 2949/0732 at flange portion
• CPC Class Codes: B29C 2949/0733 at body portion
• CPC Class Codes: B29C 2949/0773 Threads
• CPC Class Codes: B29C 2949/0777 Tamper-evident band retaining ring
• CPC Class Codes: B29C 2949/078 characterised by the bottom
• CPC Class Codes: B29C 2949/0811 Wall thickness
• CPC Class Codes: B29C 2949/082 Diameter
• CPC Class Codes: B29C 2949/0862 Crystallinity
• CPC Class Codes: B29C 2949/0872 Weight
• CPC Class Codes: B29C 2949/3008 at neck portion
• CPC Class Codes: B29C 2949/3012 at flange portion
• CPC Class Codes: B29C 2949/3016 at body portion
• CPC Class Codes: B29C 2949/302 at bottom portion
• CPC Class Codes: B29C 2949/3026 having two or more components
• CPC Class Codes: B29C 2949/303 : having more than three components
• CPC Class Codes: B29C 2949/3034 : having two or more components being injected
• CPC Class Codes: B29C 2949/3038 : having more than three components being injected
• CPC Class Codes: B29C 2949/3042 : having two or more components being extruded
• CPC Class Codes: B29C 2949/3046 : having more than three components being extruded
• CPC Class Codes: B29C 2949/3092 : by using adhesives
• CPC Class Codes: B29C 48/09 : Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/21 : the layers being joined at their surfaces
• CPC Class Codes: B29C 48/3366 : using a die with concentric parts, e.g. rings, cylinders
• CPC Class Codes: B29C 48/908 : characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
• CPC Class Codes: B29C 48/91 : Heating, e.g. for cross linking
• CPC Class Codes: B29C 48/9115 : of hollow articles
• CPC Class Codes: B29C 48/919 : using a bath, e.g. extruding into an open bath to coagulate or cool the material
• CPC Class Codes: B29C 49/04 : Extrusion blow-moulding
• CPC Class Codes: B29C 49/071 : Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
• CPC Class Codes: B29C 49/22 : using multilayered preforms or parisons
• CPC Class Codes: B29D 22/003 : Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2995/0069 : non-permeable
• CPC Class Codes: B32B 1/08 : Tubular products
• CPC Class Codes: B32B 2307/7244 : Oxygen barrier
• CPC Class Codes: B32B 2310/0472 : inert gas
• CPC Class Codes: B32B 2367/00 : Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/306 : comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: Y10T 428/1383 : Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]
• CPC Class Codes: Y10T 428/2495 : Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers

Abstract

A process for the production of a multi-layer pipe to be used for formation of a bottle by draw-blow-forming, comprising forming by co-extrusion a pipe having inner and outer layers of a polyester composed mainly of ethylene terephthalate units and an intermediate layer of an oxygen-barrier resin interposed between the inner and outer layers, an adhesive resin layer is preferably interposed between every two adjacent layers. The co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is sized is uniform. The process continues by cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas or an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe A.

Multi-layer pipe prepared according to this process is excellent in the transparency and the draw-formability into a multi-layer drawn bottle.

Claims

1. A multi-layer polyester bottle formed of a laminate comprising (i) inner and outer layers of a polyester composed mainly of ethylene terephthalate units, (ii) an intermediate layer of an oxygen-barrier resin and (iii) an adhesive resin layer interposed between every two adjacent layers, said bottle being obtaining by (I) co-extruding said resin into a pipe comprising said laminate, said pipe having the thickness ratio of the inner polyester layer to the outer polyester layer of from 1/1.1 to 1/5, (II) solidifying the extruded pipe by cooling, (III) cutting the solidified pipe into a predetermined size, (IV) forming a closed bottom on one end of the cut pipe, (V) heating the obtained preform at a drawing temperature and (VI) biaxially stretch-blow-forming the heated preform into the bottle.

2. A vessel according to claim 1, wherein the thickness ratio of the inner polyester layer to the outer polyester layer is from 1/2 to 1/3.

3. A vessel according to claim 1, wherein said adhesive layer is from a group consisting of a copolyester type adhesive, a polyester-ether type adhesive, an epoxy-modifified thermoplastic resin and an acid-modified thermoplastic resin.

4. A vessel according to claim 1, wherein the thickness ratio of the outer polyester layer to the adhesive layer is from 5/1 to 100/1.

5. A vessel according to claim 1, wherein the inner and outer layers are polyethylene terephthalate (PET).

6. A vessel according to claim 1, wherein the oxygen-barrier resin is an ethylene/vinyl alcohol copolymer.

7. A vessel according to claim 6, wherein the ethylene/vinyl alcohol copolymer is one having an ethylene content of 15 to 50 mole % and a saponification degree of at least 96%.

8. A vessel according to claim 6, wherein the ethylene/vinyl alcohol copolymer is one having an ethylene content of 25 to 45 mole % and a saponification degree of at least 90%.