Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
  • C08G63/78—Preparation processes
  • C08G63/82—Preparation processes characterised by the catalyst used
  • C08G63/83—Alkali metals, alkaline earth metals, beryllium, magnesium, copper, silver, gold, zinc, cadmium, mercury, manganese, or compounds thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
  • C08G63/78—Preparation processes
  • C08G63/82—Preparation processes characterised by the catalyst used
  • C08G63/85—Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof
  • C08G63/86—Germanium, antimony, or compounds thereof
  • C08G63/863—Germanium or compounds thereof

Definitions

• the invention relates to a process for producing a polyester or a copolyester from polyethylene terephthalate units by polycondensation by means of a mixed catalyst comprising several components, at least one component being a lithium salt or a germanium salt, the polyester 20 and the use thereof.
• polyester The production of a polyester is known.
• an acid component such as terephthalic acid or its methyl ester and a
• glycol component such as ethylene glycol directly esterified in a first process stage or subjected to a transesterification reaction and subjected to the actual polycondensation in a second process step. This requires catalysts from
• EP-A-0425215 describes a process in which an Mn / Li / Co / Sb catalyst is used in the polycondensation. Lithium in combination with antimony is said to accelerate the polycondensation massively.
• FR-A-2 570 077 mentions the use of lithium germanate as a catalyst for polycondensation. No embodiment is mentioned from what concentrations and how it works.
• the sodium germanate of the examples has been solubilized via the alkali metal oxide or carbonate by known reaction with germanium dioxide, the Na.Ge ratio being approximately 0.5: 1.
• the sodium germanate is used to accelerate the polycondensation in a reaction mixture which is incompletely inhibited with phosphate compounds.
• the object of the invention is the economical production of an antimony-free polyester without reducing the known quality of the polyester.
• a molar ratio of Li: Ge of about 12: 1 to 1: 1 has proven to be a polycondensation catalyst. proven to be particularly suitable.
• the polyester produced should contain less than 50 ppm Li, preferably 20-45 ppm Li and 20-50 ppm Ge.
• the invention will be explained using examples.
• glycol phase in which excess glycol is distilled off, 5.0 g of titanium dioxide (0.05%, Hombitan-LWS, trademark of Sachtleben, FRG) and 7.5 g of Irganox 1010 (0.075%, trademark) are used at 240 ° C from CIBA-GEIGY AG, Switzerland) dosed as a suspension in ethylene glycol.
• the glycol phase is terminated at 245 ° C.
• the granulated polymer is dried and crystallized in a double cone dryer using the following method:
• the 8-10 kg polymer are first heated to 90 ° C (1 h) and then 115 ° C (1 h) heated up. The heating continues: final temperature
• the dried and crystallized polymers are spun into dtex 55f24 threads using the following process:
• the threads are then drawn in a laboratory stretching system in one step to a residual elongation of 28 ⁇ 2%.
• the thread is passed over a heating surface with a temperature of 200 ° C.
• the temperature of the godet 1 is 85 ° C.
• the deduction godet is cold. It is stretched at a take-off speed of 100 m / min. The stretch ratio is approximately 3.3.
• lithium acetate is very well suited as a cocatalyst together with germanium for the polycondensation.
• the polycondensation time could be reduced so much that at the same time a reduction in the required amount of germanium was made possible.
• the germanium content could be reduced by more than half.
• the process is particularly suitable for the production of glossy polyester products.
• Example 7 Both the combination “a lot of lithium and a little germanium” (examples 1 and 2) and the combination “with almost the same amount of lithium and germanium” (example 7) show favorable polycondensation times.
• a disadvantage of Examples 1 and 2 is the excessive coloring in the yellow area on the thread (large Db value).
• Example 7 is both lighter (positive DL value) and more neutral in color (smaller Da and Db value).

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Polyesters Or Polycarbonates (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=4208378

Family Applications (1)

Country Status (11)

Families Citing this family (4)

Family Cites Families (2)

• 1993
  • 1993-04-21 CZ CZ94174A patent/CZ17494A3/cs unknown
  • 1993-04-21 WO PCT/CH1993/000105 patent/WO1993022367A1/de not_active Application Discontinuation
  • 1993-04-21 HU HU9400236A patent/HU212446B/hu not_active IP Right Cessation
  • 1993-04-21 CA CA 2111969 patent/CA2111969A1/en not_active Abandoned
  • 1993-04-21 JP JP5518809A patent/JPH06509386A/ja active Pending
  • 1993-04-21 SK SK90-94A patent/SK9094A3/sk unknown
  • 1993-04-21 AU AU38865/93A patent/AU3886593A/en not_active Abandoned
  • 1993-04-21 PL PL30637593A patent/PL306375A1/xx unknown
  • 1993-04-21 TW TW82103064A patent/TW227006B/zh active
  • 1993-04-21 EP EP93907749A patent/EP0591488A1/de not_active Withdrawn
  • 1993-04-26 AR AR32482293A patent/AR246751A1/es active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events