Container and method of making container from polyethylene naphthalate and copolymers thereof

• US 5,780,130 A
• Filed: 12/31/1996
• Issued: 07/14/1998
• Est. Priority Date: 10/27/1994
• Status: Expired due to Fees

• Current Assignee: The Coca-Cola Company
• Original Assignee: The Coca-Cola Company
• Inventors: Osakada, Kunio, Myers, Michael J., Hansen, Jeffrey E.
• Primary Examiner(s): DYE, RENA
• Application Number:
  US08/775,309
• Time in Patent Office: 560 Days
• Field of Search: 215/379, 215/382, 215/375, 215/374, 428/35.7, 428/36.92, 428/480, 428/542.8, 428/220, 428/910, 428/36.9, 428/532, 428/537
• US Class Current: 428/35.7
• CPC Class Codes: B29C 2049/7862 characterised by temperature values or ranges
• CPC Class Codes: B29C 2049/7879 Stretching, e.g. stretch rod
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/08 Biaxial stretching during blow-moulding
• CPC Class Codes: B29C 49/087 Means for providing controlled or limited stretch ratio
• CPC Class Codes: B29C 49/6605 Heating the article, e.g. for hot fill
• CPC Class Codes: B29K 2067/00 Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B65D 1/0207 characterised by material, e.g. composition, physical features
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article
• CPC Class Codes: Y10T 428/1397 Single layer [continuous layer]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

The present invention is directed to a pourable, hot wash, refillable container comprising a base, a cylindrical body having an average side wall thickness of at least 0.635 mm, a shoulder portion, and a neck portion, the pourable, hot wash, refillable container being composed of polyethylene napthalate or a copolymer thereof, the refillable container being capable of undergoing multiple trips through a washing, filling, shipping and consumer use cycle, and the base of the container having sufficient impact resistance so that the container will not break when dropped one meter onto a concrete surface when filled with water at both 4.4° C. and 22.2° C. The invention is further directed to a method for manufacturing a pourable, hot wash, refillable container, which comprises the steps of forming a preform of the container composed of polyethylene napthalate or a copolymer thereof, and molding said preform to form a pourable, hot wash, refillable container.

Claims

1. A pourable, hot wash, refillable container comprising a base, a cylindrical body having an average side wall thickness of at least 0.635 mm, a shoulder portion, and a neck portion, said pourable, hot wash, refillable container comprising polyethylene napthalate homopolymer, said container being capable of undergoing multiple trips through a washing, filling, shipping and consumer use cycle, and said base of said container being oriented and having sufficient impact resistance so that said container will not break when dropped one meter onto a concrete surface when filled with water at both 4.4°

C. and 22.2°

C., said base of said container being oriented by the process of blow-molding a preform wherein the preform stretch ratio is in the range of 5 to 9.

2. The refillable container according to claim 1, wherein said container is a bottle.

3. The refillable container according to claim 1, wherein the container is a blow-molded biaxially-oriented container.

4. The refillable container according to claim 1, wherein the container has an average side wall thickness of about 0.635 mm to about 0.813 mm.

5. The refillable container according to claim 1, wherein the stretch ratio is in the range of 7-9.

6. The refillable container according to claim 1, wherein said container is a 1.5 liter bottle.

7. A pourable, hot wash, refillable container comprising a base, a cylindrical body having an average wall thickness of at least 0.635 mm, a shoulder portion, and a neck portion, said pourable, hot wash, refillable container being composed of a copolymer of polyethylene napthalate comprising at least about 51% dimethyl-2,6-naphthalene-dicarboxylate as an acid component and 49% or less of another acid component, said refillable container being capable of undergoing multiple trips through a washing, filling, shipping and consumer use cycle, and said base of said container being oriented and having sufficient impact resistance so that said container will not break when dropped one meter onto a concrete surface when filled with water at both 4.4°

C. and 22.2°

C., said base of said container being oriented by the process of blow-molding a preform wherein the preform stretch ratio is in the range of 5 to 9.

8. The refillable container according to claim 7, wherein the container comprises a copolymer of polyethylene napthalate containing 8% or less of an acid component other than dimethyl-2,6-naphthalene-dicarboxylate.

9. The refillable container according to claim 7, wherein said refillable container is a bottle.

10. The refillable container according to claim 7, wherein the container is a blow-molded biaxially-oriented container.

11. The refillable container according to claim 7, wherein the copolymer includes 6% or less of an acid component other than dimethyl-2,6-naphthalene-dicarboxylate.

12. The refillable container according to claim 7, wherein the container has an average side wall thickness of about 0.635 mm to about 0.813 mm.

13. The refillable container according to claim 7, wherein the copolymer of polyethylene napthalate includes 3% or less of an acid component other than dimethyl-2,6-naphthalene-dicarboxylate.

14. The refillable container according to claim 7, wherein the stretch ratio is in the range of 7-9.

15. The refillable container according to claim 7, wherein said container is a 1.5 liter bottle.

16. A pourable, hot wash, refillable container comprising a base, a cylindrical body having an average wall thickness of at least 0.635 mm, a shoulder portion, and a neck portion, said pourable, hot wash, refillable container being composed of a copolymer of polyethylene napthalate comprising at least about 97% dimethyl-2,6-naphthalene-dicarboxylate as an acid component and 3% or less of another acid component, said refillable container being capable of undergoing multiple trips through a washing, filling, shipping and consumer use cycle, and said base of said container being oriented and having sufficient impact resistance so that said container will not break when dropped one meter onto a concrete surface when filled with water at both 4.4°

C. and 22.2°

C., said base of said container being oriented by the process of blow-molding a preform wherein the preform stretch ratio is in the range of 5 to 9.

17. The refillable container according to claim 16, wherein the stretch ratio is in the range of 7-9.

18. The refillable container according to claim 16, wherein said container is a 1.5 liter bottle.