TH56909B - The process of making a container from a polyester polymer particle with a minimal intrinsic viscosity gradient. - Google Patents

Abstract

DC60 (16/05/48) Nowadays, a polymer particle with lt.V., surface and center, where lt.V. at the particle surface is Less than 0.25 dl / g, higher than lt.V. in the middle of the particle. Crystalline polyester particles are preferred to Prevents particles from sticking while drying, and where required is less than 10 ppm acetaldehyde. A polyester container, suitable preform or beverage bottle, is made by particle feeding. Crystalline polyester with at least 0.70 dl / g lt.V. to the extrusion area, melting the particles in the extrusion area to form a polyester polymer composition. That is molten, and formed into sheets or cast parts From the extruded molten polyester polymer, where at least part of the polyester particle has lt.V. on its surface, which is not deformed from lt. .V. In the middle of it is greater than 0.25 dl / g, and the particles are not polymerized in the hardened state. Such polyester compositions have lt.V. suitable for containers, Loss of lt.V. during melting process Less than the existing polyester. At present, it has been supplied with lt.V. polymer particles with lt.V., surface and center, where lt.V. at the surface of the particle is less than 0.25 dl / g. Than lt.V. in the middle of the particle. Crystalline polyester particles are preferred to Prevents particles from sticking while drying, and where required is less than 10 ppm acetaldehyde. A polyester container, suitable preform or beverage bottle, is made by particle feeding. Crystalline polyester with at least 0.70 dl / g lt.V. to the extrusion area, melting the particles in the extrusion area to form a polyester polymer composition. That is molten, and formed into sheets or cast parts From the extruded molten polyester polymer, where at least part of the polyester particle has lt.V. on its surface, which is not deformed from lt. .V. In the middle of it is greater than 0.25 dl / g, and the particles are not polymerized in the hardened state. Such polyester compositions have lt.V. suitable for containers, Loss of lt.V. during melting process Less than the existing polyester.

Claims (52)

1. Polyester polymer particles composed of a polyester polymer containing: (a) a carboxylic acid component consisting of at least 90 mol% of terephthalic acid residue, terephthalic acid derivatives, naphthalene-2,6-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid derivatives, or a mixture of these; and (b) a hydroxyl component consisting of at least 90 mol% of ethylene glycol residue, relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl component residue in the polyester polymer, where such particles have a lt.V. of at least 0.70 dL/g, and the lt.V. at the particle surface is less than 0.25 dL/g, greater than the lt.V. at the particle center. 2. A particle of claim 1, where that particle has a lt.V of at least 0.74 dL/g. 3. The particle of claim 2, where the particle has a lt.V of at least 0.77 dL/g. 4. The particle of claim 2, where the lt.V at the particle surface is less than 0.20 dL/g, is greater than the lt.V at the center of the particle. 5. The particle of claim 1, where the lt.V. at the particle's surface is less than 0.15 dL/g, is greater than the lt.V. at the center of the particle. 6. Particles of Claim 1, where the particles have a degree of crystallinity of at least 25%. 7. Particles of Claim 1, where the particles contain less than 10 ppm acetaldehyde. 8. Polyester particles with an average weight of at least 1.0 g per 100 particles, where each particle is a polyester particle of claim 1. 9. Polyester particles of Claim 1, where such polyester particles are impurity-free polyester polymers. 10. Polyester particles of Claim 1, where the polyester polymer contains at least (a) a carboxylic acid component consisting of at least 92 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component consisting of at least 92 mol% of ethylene glycol residue, relative to 100 mol% of polycarboxylic acid component residue and 100 mol% of hydroxyl component residue in the polyester polymer. 11. A particle of claim 1, where the lt.V. of the particle at the surface does not vary from the lt.V. of the particle at the center by more than 0.10 dL/g. 12. A particle of claim 11, where the lt.V. of the particle at the surface does not vary from the lt.V. of the particle at the center by more than 0.20 dL/g. 13. Particles of claim 11, where the polyester polymer contains at least: (a) a carboxylic acid component consisting of at least 96 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component consisting of at least 96 mol% of ethylene glycol residue, relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl component residue in the polyester polymer. 14. Particles of claim 13, where the particles have a crystallinity of at least 25%. 15. A particle of claim 1, consisting of a total mass of such particles with a volume of at least 1 cubic meter. 16. Particles of claim 15, where the average lt.V. of the difference between the lt.V. of the surface of the particle and the lt.V. of the center of the particle in the aggregate mass is not greater than 0.20 dL/g. 17. The particle of claim 16, where the average lt.V. of the difference is not greater than 0.10 dL/g. 18. Blow-molded containers made from polyester polymer particles of any one of the patents 1-17. 19. Beverage bottles made from polyester particles, the polymer of claim 1. 20. Polyester particles with a crystallinity of at least 25% and a lt.V. of at least 0.70 dL/g, where the lt.V. at the surface and at the center of the particle is less than 0.25 dL/g and higher than the lt.V. at the center of the particle. 21. Particle of claim 20, where the polyester polymer contains: (a) a carboxylic acid component consisting of at least 90 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component consisting of at least 90 mol% of ethylene glycol residue, relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl residue in the polyester polymer. 22. Polyester particles of claim 21, where the degree of crystallinity is at least 35%, and the lt.V. of the particles is at least 0.74 dL/g. 23. Polyester particles of claim 21, where the difference between the lt.V. of the particle at its surface and its center is 0.15 dL/g or less. 24. Polyester particles of claim 23, where the difference is 0.05 dL/g or less. 25. Blow-molded containers obtained from polyester particles of Patent 1 with a crystallinity of at least 35%, and lt.V. of at least 0.77 dL/g, such blow-molded containers are obtained without pellet molecular weight increase by solid-state polymerization. 26. A process for making containers from polyester polymer, consisting of feeding polyester particles with a crystallinity level of at least 15%, and a lt.V. of at least 0.70 dL/g, into the extrusion zone; melting the particles in the extrusion zone to form a molten polyester polymer composition; and molding the molten polyester polymer into sheets or cast parts, where the polyester particles fed into the extrusion zone have a surface lt.V. less than 0.25 dL/g higher than the lt.V. at the center. 27. The process of claim 26, where the lt.V. at the surface of a particle is less than 0.20 dL/g higher than the lt.V. at its center. 28. The process of claim 27, where the difference between the lt.V. of a particle at its surface and its center is 0.10 dL/g or less. 29. The process of claim 28, where the difference is 0.05 dL/g or less. 30. The process under claim 26, where the cast part is a pre-formed shape of the vessel. 31. The process under claim 30, which involves blow molding to pre-form a beverage container. 32. The process pursuant to claim 31, where the container has a volume of 3 liters or less. 33. The process under claim 27, which involves drying the particles in a drying area at a temperature of at least 140°C before melting the particles in the extrusion area. 34. The process under claim 26, which involves drying the particles before feeding them into the extrusion area, where the particles are not polymerized in a solid state prior to drying. 35. The process according to claim 34, where particles have an acetaldehyde level of 10 ppm or less prior to melting in the extrusion area. 36. The process pursuant to claim 26, where the polyester polymer particles consist of: (a) a carboxylic acid component containing at least 90 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component containing at least 90 mol% of ethylene glycol residue relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl component residue in the polyester polymer, and at least 75% of the polyester polymer is impurity-free. 37. The process pursuant to claim 36, where the polyester polymer particles consist of: (a) a carboxylic acid component containing at least 92 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component consisting of at least 92 mol% of ethylene glycol residue relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl component residue in the polyester polymer. 38. The process pursuant to claim 37, where the crystallinity level is at least 25%. 39. The process according to claim 26, where the crystallinity level is at least 35%. 40. The process under claim 26, consisting of a total mass of such particles with a volume of at least 1 m³. 41. Particle of claim 40, where the average lt.V. of the difference between the lt.V. of the surface of the particle and the lt.V. of the center of the particle in the aggregate mass is not greater than 0.20 dL/g. 42. Particle of claim 41, where the average lt.V. of the difference is not greater than 0.10 dL/g. 43. Blow-molded containers derived from particles, as per claim 26. 44. Pre-formed material derived from particles of claim 26. 45. Polyester particles with a particle weight greater than 1.0 g per 100 particles and less than 100 g per 100 particles, such particles, consisting of at least 75% pure polyester polymer, containing: (a) a carboxylic acid component containing at least 90 mol% of terephthalic acid residue, or terephthalic acid derivatives, or a mixture of these, and (b) a hydroxyl component containing at least 90 mol% of ethylene glycol residue relative to 100 mol% of the carboxylic acid component residue and 100 mol% of the hydroxyl component residue in the polyester polymer, these particles have a level Crystallinity must be at least 25%, lt.V. at least 0.77 dL/g, lt.V. at the surface and lt.V. at the center where the lt.V. at the particle surface is no more than 0.15 dL/g higher than the lt.V. at the center, and an acetaldehyde level of 10 ppm or less. 46. Particle of claim 45, where the particle consists of an aggregate with a volume of at least 1.0 m³. 47. Particle of claim 46, where the average lt.V. of the difference between the lt.V. of the surface of the particle and the lt.V. of the center of the particle in the aggregate mass is not greater than 0.15 dL/g. 48. Particle of claim 47, where the average lt.V. of the difference is not greater than 0.10 dL/g. 49. Particle of claim 48, where the average lt.V. is no more than 0.05 dL/g. 50. Blow-molded containers derived from particles, as per claim 45. 51. Beverage bottles derived from particles of claim 45. 52. Pre-formed material derived from particles of claim 45.