Blends of copolyesters having recycled content and high heat resistance
A technology of blends and copolyesters, applied in the field of polymer compositions, can solve problems such as limited use
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[0144] The polymer composition according to the invention and its preparation are further illustrated by the following examples.
[0145] Unless otherwise stated, the glass transition temperature (T g ), melting temperature (T m ), heat of crystallization, heat of fusion, and percent crystallinity were determined as follows: according to ASTM D3418-15, using differential scanning calorimetry (DSC), using a TA Instruments DSC Q2000 instrument with a standard aluminum sample pan, from 0-300 °C The first and second heating were performed at a ramp rate of 20 °C / min, the sample pan containing 3 g of sample cut from a molded bent bar (216 x 12.7 x 3.2 mm). Each sample was sealed in an aluminum pan and heated to 300°C at a rate of 20°C / minute. The sample was then cooled below its glass transition temperature at a rate of about 20°C / min to produce an amorphous sample. Melting temperature T m Corresponds to the endothermic peak observed during the scan.
[0146] Unless otherwise ...
example 1
[0167] Example 1: Copolyester 1+ (PET or rPET) blend
[0168] Copolyester 1 was blended with PET or rPET in various proportions, as shown in Table 1. The blends were prepared by melt blending, and as described below, for each of blends A to F, molded Prepare test products.
[0169] Table 1: Blend ratio of copolyester 1 and PET
[0170] blend Blend ratio A Copolyester 1+10% PET9921 B Copolyester 1+20% PET9921 C Copolyester 1+25% PET9921 D Copolyester 1+25% PolyQuestrPET E Copolyester 1+40% PolyQuestrPET F Copolyester 1+50% PolyQuestrPET
[0171] Blending and Molding Conditions for Blends A-F:
[0172] A. Copolyester 1 and 10% Eastman PET 9921 were compounded using a 40 mm co-rotating intermeshing twin screw extruder. Copolyester 1 was co-fed with PET. The temperature distribution is as follows, zone 1 is 200°C, zone 3-8 is 260°C, and 2-hole mold is 260°C. The screw speed was 260 RPM and the feed rate was 150 lb / hr. The e...
example 2
[0183] Example 2: Copolyester 2+ (PET or rPET) blend.
[0184] Copolyester 2 was blended with PET or rPET in various ratios, as shown in Table 3. The blends were prepared by melt blending and, for each of blends G through Q, test articles were molded as described below.
[0185] Table 3: Copolyester 2 and PET blends
[0186] blend Blend ratio G Copolyester 2+10% PET9921 H Copolyester 2+20% PET9921 I Copolyester 2+20% PET9921 J Copolyester 2+25% PET9921 K Copolyester 2+30% PET9921 L Copolyester 2+37% PET9921 M Copolyester 2+40% PET9921 N Copolyester 2+40% PET9921 O Copolyester 2+50% PET9921 P Copolyester 2+53% PET9921 Q Copolyester 2+25% PolyQuestrPET
[0187] Blending and Molding Conditions for Blends G-Q:
[0188] G. Copolyester 2 and 10% Eastman PET 9921 were mixed using a 40 mm co-rotating intermeshing twin screw extruder. Copolyester 2 was co-fed with PET. The temperature distribution is ...
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