Improved polyester-ether resin blends
A technology of polyester and composition, applied in the field of polyester-ether resin composition
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Embodiment 1
[0166] Example 1 - Copolyester-Ether (COPE) Preparation
[0167] Preparation of the base resin copolyester-ether (COPE) using continuous polymerization: terephthalic acid (PTA) and monoethylene glycol were carried out in a primary esterification reactor at 250-260 °C and atmospheric pressure in the presence of titanium catalyst C94 Direct esterification of diol (EG) with a slight molar excess of ethylene glycol (approximately 1.10:1 EG:PTA molar ratio). Add about 35% by weight based on final copolyester-ether polymer weight after esterification PTMEG 1400 and the mixture was stirred for about 1 hour. will later 4050 was added to the esterification reaction mixture and polycondensation started shortly thereafter.
[0168] In the polycondensation step, removal of ethylene glycol under reduced pressure was initiated, and the final polycondensation temperature was in the range of 255-260°C. The final polycondensation pressure is about 1 mbar. Excess ethylene glycol was di...
Embodiment 2
[0172] Example 2 -Cobalt stearate masterbatch (Co-MB) preparation
[0173] The PTA-based polymer as used herein is a commercial polyethylene terephthalate (PET) polyester product from INVISTA Resins and Fibers under the product designation " Polyester 7090". Prepared according to a similar direct esterification method as described in Example 1 Polyester 7090. The PET polymer resin was dried at 150-160°C under vacuum with dry air (<-30°C dew point) for 4-6 hours to a residual moisture content of 50 ppm (maximum).
[0174] Cobalt stearate, sodium stearate (or sodium acetate), magnesium stearate and suitable colorant dyes are added directly in the melt extrusion step. The melt extruder used was a co-rotating, 27 mm extruder screw diameter with a screw length to diameter (L:D) ratio of 36:1, eg a Leistritz Micro 27 36D melt extruder. The polymer processing rate was about 8 kg / hr. The step-by-step operating temperature is: room temperature water (T 0 ), 230°C (T 1 ), 254°...
Embodiment 3
[0176] Example 3 (a-e) - Cobalt stearate masterbatch (Co-MB) with different metals
[0177] The Co-MB composition of Example 3 was prepared according to the method described in Example 2. Individual metal compounds are added to the composition to obtain various metal levels in the final composition. Table 2 below represents Co-MB compositions prepared according to the present disclosure. Table 2 also presents the measured intrinsic viscosity (IV) data for the prepared final Co-MB compositions comprising different metals in ppm by weight measured relative to the final Co-MB composition content.
[0178] Table 2
[0179]
[0180] In Table 2, the cobalt metal level was maintained at about 2250 ± 150 ppm by weight, with the exception of Example 3(e), where the cobalt metal level was almost doubled to 4290 ppm by weight relative to the final Co-MB composition. Individual Mg and Na levels were varied by adjusting individual metal compounds in the Co-MB preparation.
[0181...
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