Polyethylene-2,6-naphthalene dicarboxylate resin and preform and bottle molded thereof

• US 6,228,447 B1
• Filed: 03/03/1998
• Issued: 05/08/2001
• Est. Priority Date: 03/06/1997
• Status: Expired due to Term

• Current Assignee: Teijin Limited
• Original Assignee: Teijin Limited
• Inventors: Suzuki, Minoru, Sato, Kimihiko
• Primary Examiner(s): Robinson, Ellis
• Assistant Examiner(s): RAYFORD, SANDRA M
• Application Number:
  US09/033,701
• Time in Patent Office: 1,162 Days
• Field of Search: 428/35.7, 428/542.8, 428/903.3, 528/275, 528/280, 528/285, 528/286, 528/298
• US Class Current: 428/35.7
• CPC Class Codes: C08G 63/189 containing a naphthalene ring
• CPC Class Codes: C08G 63/82 characterised by the catalyst used
• CPC Class Codes: C08G 63/866 Antimony or compounds thereof
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]

Abstract

A polyethylene-2,6-naphthalene dicarboxylate resin contains an antimony compound as a polycondensation catalyst, and has an intrinsic viscosity of 0.55 to 0.75 dl/g, a terminal carboxyl group content of 32 eq/ton or less, an acetaldehyde content of 8 ppm or less and a diethylene glycol component content of 0.8 to 3.0 wt %. A preform and a bottle made of the resin are also described.

Claims

1. A polyethylene-2,6-naphthalene dicarboxylate resin for molding a bottle,

which comprises 70 mol % or more of 2,6-naphthalenedicarboxylic acid as a main acid component and 70 mol % or more of ethylene glycol as a main glycol component;

contains an antimony compound as a polycondensation catalyst and a cobalt compound, a magnesium compound, a calcium compound and a phosphorous compound in such amounts that they satisfy the following expressions;

2. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, which has an intrinsic viscosity of 0.58 to 0.73 dl/g.

3. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, which has a terminal carboxyl group content of 30 eq/ton or less.

4. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, which has an acetaldehyde content of 6 ppm or less.

5. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, which has a diethylene glycol component content of 1.0 to 2.8 wt %.

6. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, wherein the amount of the cobalt compound satisfies the following expression:

7. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 1, wherein the amount of the antimony compound satisfies the following expression:

11. A preform for a bottle, which is formed from the polyethylene-2,6-naphthalene dicarboxylate resin of claim 1.

12. A bottle formed from the polyethylene-2,6-naphthalene dicarboxylate resin of claim 1.

8. A polyethylene-2,6-naphthalene dicarboxylate resin for molding a bottle,

which comprises 70 mol % or more of 2,6-naphthalenedicarboxylic acid as a main acid component and 70 mol % or more of ethylene glycol as a main glycol component;

contains an antimony compound as a polycondensation catalyst and a cobalt compound, a manganese compound and a phosphorous compound in such amounts that satisfy the following expressions;

9. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 8, wherein the amount of the cobalt compound satisfies the following expression:

10. The polyethylene-2,6-naphthalene dicarboxylate resin of claim 8, wherein the amount of antimony compound satisfies the following expression:

13. A preform for a bottle which is formed from the polyethylene-2,6-naphthalene dicarboxylate resin of claim 8.

14. A bottle formed from the polyethylene-2,6-naphthalene dicarboxylate resin of claim 8.