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Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)

A technology of polyethylene terephthalate and polybutylene terephthalate, which is used in the preparation of polybutylene terephthalate (PET) from polyethylene terephthalate (PET). PBT) field

Inactive Publication Date: 2009-04-22
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The known technology does not provide a meaningful solution to the long-felt need for new thermoplastic compositions containing fillers, PBT derived from PET, and having a highly useful comprehensive and highly valuable physical properties

Method used

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  • Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)
  • Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)
  • Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Small scale method (BDO:PET=2.9:1)

[0113] Green recycled PET pellets were obtained from supplier St. Jude in North America. Post-consumer recycled PET pellets have an iv specification of 0.68-0.78 and a melting point specification of 245-255°C. Butanediol was obtained from BASF with a purity specification of >99.5 wt%. The TPT catalyst is a commercial Tyzor grade from Dupont.

[0114] In a 500 ml reactor, 100 g of recycled PET pellets were mixed with 134 g of butanediol (2.9:1 molar ratio). The temperature of the oil bath (for the kettle) was increased from 180°C to 255°C. The stirrer speed was set at 20 rpm. At this point, 0.2 ml of TPT catalyst was also added to the reaction mixture. The reaction mass reached 227°C (the boiling point of butanediol) and the BDO was refluxed at this temperature for 2 hours. This is called the PET diol alcoholysis stage.

[0115] To carry out the polymerization stage, the reflux condensate was removed and vacuum was applied to t...

Embodiment 2

[0117] Pilot plant method (BDO:PET=2.9:1)

[0118] Modified polybutylene terephthalate random copolymers are produced on a large scale from polyethylene terephthalate components in a helicone reactor. The helical reactor has a capacity of 40 liters and is fitted with specially designed pairs of oppositely arranged helical blades with a twist of 270 degrees; constructed of 316SS with a 16g polished finish. The blade speed can be from 1 to 65 rpm. The stirrer was connected to a 7.5HP ConstantTorque Inverter Duty Motor operating at 230 / 460 VAC, 3PH and 60Hz. These agitators provide excellent surface area to the polymer melt to build molecular weight. The spiral reactor can also be designed with an overhead condenser to condense vapors from the glycolysis, transesterification (if any) and polymerization stages.

[0119] The screw reactor was charged with 25 lbs (11.4 kg) recycled PET pellets and 35 lbs (15.9 kg) butanediol (2.9:1 molar ratio). 4.6 ml (100 ppm as Ti) of TPT cat...

Embodiment 3-10

[0122] These examples are primarily intended to understand the effect of the presence of higher levels of ethylene glycol in PET derived PBT. The examples were carried out on laboratory scale as well as on pilot plant scale in order to study the effect of ethylene glycol residues on the performance of PBT. Use virgin PET as well as recycled PET as feedstock to convert to PET-derived PBT. Examples 3, 7, 10 and 11 used recycled PET pellets, while Examples 4, 5 and 6 used virgin PET. In Examples 8 and 10, additional ethylene glycol had to be added to the reaction mixture in order to be able to obtain a PET-derived PBT copolymer with a high ethylene glycol content.

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Abstract

The invention relates to a process for making modified polybutylene terepththalate random copolymers from a polyethylene terephthalate component. In one embodiment, the invention relates to a two step process in which a 1,4-butane diol component reacts with a polyethylene terephthalate component under conditions that depolymerize the polyethylene terephthalate component into a molten mixture and the molten mixture is placed under subatmospheric conditions that produce the modified polybutylene terepththalate random copolymers. In another embodiment, the invention relates to a three step process in which a diol component selected from the group consisting of ethylene glycol, propylene glycol, and combinations thereof reacts with a polyethylene terephthalate component under conditions sufficient to depolymerize the polyethylene terephthalate component into a first molten mixture; and where the first molten mixture is combined with 1,4-butane diol under conditions that create a second molten mixture that is subsequently placed under subatmospheric conditions that produce the modified polybutylene terepththalate random copolymers. The invention also relates to compositions made from processes of the invention.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application Serial No. 60 / 763093, filed January 27, 2006, and U.S. Provisional Application Serial No. 60 / 820463, filed July 26, 2006, the entire contents of which are incorporated by reference incorporated into this application. Background of the invention [0003] Polyethylene terephthalate (also called "PET") is a polyester of terephthalic acid and ethylene glycol, and can be polycondensed by dimethyl terephthalate and ethylene glycol, and Obtained by polycondensation of dicarboxylic acid and ethylene glycol. PET exists as amorphous (transparent) and semi-crystalline (opaque and white) thermoplastics. In general, it has beneficial chemical resistance to mineral oils, solvents and acids, but no chemical resistance to bases. Semi-crystalline PET has good strength, ductility, rigidity and hardness. Amorphous PET has better ductility, but less rigidity and hardness. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/00
CPCY02W30/62
Inventor 肯尼思·F·米勒加尼什·坎南桑迪普·K·达万达瓦尔·沙克里斯滕·科洪罗伯特·R·加卢西
Owner SABIC INNOVATIVE PLASTICS IP BV
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