Cyclohexane dimethanol polyesters

FIGURE 13 Cumulative release of -nitroacetanilide (PNAC) from polyester discs prepai ed from 3,9-bis(ethylidene-2,4,8,10-tetraoxas-piro[5,5]undecane) and a 60 10 30 mole ratio of trans-cyclohexane dimethanol, 1,6-hexanediol, and triethylene glycol at pH 7.4 and 37 C. PNAC content 2 wt% (o) 0 mol%, ( ) 0.25 mol%, ( ) 0.50 mol% 9,10-dihydroxystearic acid. (From Ref. 23.)... 

The SSP process is obviously limited by the melting point of the prepolymer and the equilibrium temperature of the polymer process. The SSP reaction becomes too slow at temperatures below 190 °C in commercial processing. Temperatures below this level are only of scientific interest or applicable in the case of thermally sensitive polyesters. The increase in IV for the most common polyesters decreases in relation to the glycolic component, as shown in Figure 5.15 however, this figure does not show the behavior of cyclohexane dimethanol (CHDM) and PEN [30],... 

In the engineering polymer blends, a number of advances in the technology and the commercial areas have been realized in the past decade. New commercial polymers have been manufactured by various combinations of preexisting polymers. One of the major areas has been with polyesters and polycarbonates (polybutyleneterephthalate/ polycarbonate polyethyleneterephthalate/polycar-bonate polyarylate/polycarbonate cyclohexane dimethanol based polyesters/polycarbonate). 

A cross-linkable embossed film containing polyester stilbene has been prepared [140]. The substrate film comprised a copolyester consisting of repeating units derived from stilbene dicarboxylic acid (1-40 mol%), 1,4-cyclohexane dicar-boxylic acid (60-99 mol%), and 1,4-cyclohexane dimethanol (50-100 mol%). UV-curable polyesters containing stilbene structural unit with good thermal stability... 

Polycyclohexylendeimethylene tere-phthalate [PCT, poly( cyclohexane-1,4-dimethylene terephthalate)] n. The newest member of the commercial thermoplastic-polyester family, PCT is produced by reacting 1,4-cyclohexane dimethanol with dimethyl terephthalate. It is superior to its siblings (PET and PBT) in that it can serve... 

Eastman PA-l-2CNCp is a cyclohexane dimethanol, neopentyl glycol, 1,6 hexane diol, isophthalic acid, terephthalic acid, 1,4-cyclohexane dicarboxylic acid polyester of acid value 4 and 60% solids in Solvesso 150 solvent. The formulation is available from Eastman Chemical (publication N-330B). Eastman C-11 ketone is a ketone solvent blend with BR 200-240 °C supplied by Eastman Chemical. 

Another property recently reported in detail for polyarylate is in the polymer blend area. An early French patent [33] noted that Bisphenol A polyarylate and poly(ethylene terephthalate) yield interesting mixtures. Further studies by Kimura et al. [34] and Robeson [35] found that with modest ester-exchange polyarylate and poly(ethylene terephthalate) form miscible mixtures (thus transparent with Tg values between the constituent values). Polyarylate and poly(butylene terephthalate) were noted to be miscible without ester-exchange [36]. Miscibility of three different cyclohexane dimethanol based polyesters with polyarylate was observed under minimum time and temperature exposure conditions [35]. 

PETG polyester based on cyclohexane dimethanol/ethylene glycol/terephthalic acid... 

Figure 3.12 Gas chromatograms of hydrolysates of (a) silyl derivative of polyethylene terephthalate, (b) silyl derivative of ethylene glycol 1,4 butane diol and trans isomers of 1,4 cyclohexane diol dimethanol and (c) silyl derivative of iso- phthalic and terephthalic acids derived from a polyester. Reproduced with permission from B.J. Allen, G.M. Elser, K.P. Keller and H.D. Kinder, Analytical Chemistry, 1977, 49, 741. 1977, ACS...

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