Easy-open end

• US 8,871,351 B2
• Filed: 02/09/2007
• Issued: 10/28/2014
• Est. Priority Date: 02/09/2006
• Status: Active Grant

• Current Assignee: TOYO Seikan Kaisha Limited
• Original Assignee: TOYO Seikan Kaisha Limited
• Inventors: Yaoi, Etsuko, Sato, Kazuhiro, Sue, Toshio, Fukui, Go
• Primary Examiner(s): Shosho, Callie
• Assistant Examiner(s): ENGLISH, PATRICK NOLAND
• Application Number:
  US12/162,670
• Publication Number:
  US 20090226745A1
• Time in Patent Office: 2,818 Days
• Field of Search: None
• US Class Current: 428/457
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B65D 17/4012 for opening partially by means of a tearing tab
• CPC Class Codes: B65D 2517/0014 pivot tab and push-down tear panel
• CPC Class Codes: B65D 2517/0062 and provided with an additional U-shaped peripheral channel
• CPC Class Codes: B65D 2517/0082 Coated or laminated metal
• CPC Class Codes: C23C 22/34 containing fluorides or complex fluorides
• CPC Class Codes: C23C 22/361 containing titanium, zirconium or hafnium compounds
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

An easy-open end which is excellent from the standpoint of sanitation and environmental friendliness yet satisfying both the close adhesion and the scratch resistance despite of using a bisphenol A-free primer. The easy-open end has a polyester film applied, via a primer, onto the inner surface of the end of an aluminum base sheet forming a surface-treating layer that contains a zirconium compound and/or a titanium compound and an organic compound, wherein the primer contains a polyester resin that contains not less than 30% by weight of a carboxyl group-introduced polyester resin, and a phenol resin at a weight ratio of 50:50 to 85:15.

Claims

1. An easy-open end having a score and a rivet, and having a polyester film applied, via a primer, onto an inner surface of an end of an aluminum base sheet on which a surface-treating layer has been formed, said surface-treating layer containing a zirconium compound and/or a titanium compound and an organic compound,

wherein said primer is composed of a polyester resin and a phenol resin in the range from a weight ratio of polyester resin:

phenol resin of 50;

50 to 85;

15, said polyester resin containing not less than 30% by weight of a carboxyl group-introduced polyester resin based on the weight of the polyester resin, said carboxyl group-introduced polyester resin is obtained by a ring-opening addition reaction of a compound having a carboxylic anhydride group with a polyester resin, the compound having a carboxylic anhydride group comprises carboxylic polyanhydride, and said carboxyl group-introduced polyester resin has not less than two carboxylic anhydride groups on a molecule thereof.

2. The easy-open end according to claim 1, wherein said carboxyl group-introduced polyester resin has an acid value of 150 to 800 meq/kg.

3. The easy-open end according to claim 1, wherein said phenol resin is an m-cresol resole phenol resin.

4. The easy-open end according to claim 1, wherein said surface-treating layer is an organic/inorganic composite surface-treating layer containing the zirconium compound in an amount of 2 to 20 mg/m² calculated as zirconium atoms, a phosphorus compound in an amount of 1 to 10 mg/m² calculated as phosphorus atoms, and the organic compound in an amount of 5 to 60 mg/m² calculated as carbon atoms, said organic compound is an organic polymer having a structural unit represented by the following formula (1),

5. The easy-open end according to claim 1, wherein said surface-treating layer is an organic/inorganic composite surface-treating layer containing the zirconium compound and/or the titanium compound in an amount of 4 to 30 mg/m² calculated as zirconium atoms and/or titanium atoms, an organic phosphonic acid compound in an amount of 0.2 to 9 mg/m² calculated as phosphorus atoms, and a tannin in an amount of 2 to 90 mg/m² calculated as carbon atoms.