Polypropylene adipate

To improve the low temperature properties, a different backbone needs to be used. A mixture of polyethylene and polypropylene adipates has been found to be suitable. The physical properties are not as good as with the single polyol. 

Cyclohexylamine Laurate 2223-93-0 Cadmium Stearate 25101-03-5 Polypropylene Adipate... 

Phthalates are the most frequently used esters. Dibutylphthalate (DBP) tends to give soft compounds with tack dioctylphthalate (DOP) is less volatile and tends to produce harder compounds because of its higher molecular weight. Polymeric esters such as polypropylene adipate (PPA) are used when low volatility is required along with good heat resistance. 

All of the above are polypropylene adipates. Wypych G (2002) Plasticizer s data base. Noyes Publication, New York. James F (ed) (1993) Whittington s dictionary of plastics. Technomic Publishing Co. Inc., Carley. 

Polypropylene adipate (polypropylene glycol adipate) n. A polymeric plasticizer for vinyl chloride polymers and co-polymers formed by reacting propylene glycol and adipic acid. 

Polymeric plasticisers such as polypropylene adipate, azelate, glutarate and sebacate (or mixtures of these substances) are much less volatile than ordinary low molecular weight plasticisers. They are not easily extracted, and they weather well, but they cost more than phthalates and are not as easily processed, being mostly high viscosity substances. They are often blended with phthalates as a compromise. The polyester adipates are the most widely used. 

For compositions containing polypropylene adipate, which is only partly extracted by ether, Haslam and Squirrell [14] used a 6 hour ether extraction, followed by an 18 hour methanol extraction. The ether extract was 34.5% from a composition containing 36.1 % of a mixture of equal parts phthalate and tritolyl phosphate, but only 33.1% from a composition containing 45.7% of a mixture of equal parts of dioctyl phthalate, tritolyl phosphate and polypropylene adipate. 

The combined ether and methanol extracts amounted to 34.7% and 44.3%, respectively. Wake [15] quotes the results of some unpublished work carried out at the laboratories of RAPRA - methanol extracted 40.5% and 36.8% from compositions containing 42.3% polypropylene sebacate and 36.4% polypropylene adipate, respectively. The extracts contained PVC equivalent to 0.6% and 0.9%, respectively. Clarke and Bazill [16] extracted with ether for 15 hours then with methanol for 8 hours. They state that ether removes plasticisers whose molecular weight is less than 1000. 

Polypropylene adipate Dioctylphthalate Tritolylphtha late Diethyl ether then methanol extraction, weighing [14]... 

Polypropylene sebacate Polypropylene adipate Methanol extraction [15]... 

In these compounds, different plasticizers may give improved low temperature properties, but many are likely to be leached out in hot oil. PPA (polypropylene adipate) plasticizers are retained, but confer flexibility only at normal temperatures. 

Validation studies carried out by analysing mixtures of DOP (di-2-ethylhex-yl phthalate), calcium carbonate and blank PVC and of polypropylene adipate, calcium carbonate and blank PVC have given quantitative recoveries, as shown in Table 2.4. 

As shown in Table 2.4 this procedure will quantitatively extract monomeric plasticisers such as DOP, but for polymeries such as PPA (polypropylene adipate) only 94% was found to be extracted and therefore the dried polymer is Soxhlet extracted with ethanol for 18 h to remove the rest. The validation was carried out by weighing the plasticiser and filler into a 600 ml beaker together with sufficient blank PVC to give a total of 2 g, dissolving in 40 ml of THF and proceeding as described. 

Polyethylene, HDPE Polyethylene, LDPE Polyethylene, MDPE Polymethylpentene (PMP) Polypropylene Polypropylene Adipate Polypropylene Sebacate Polypropylene, Expandable... 

Polyamide, Nylon 11 Polyester, PCT Polyamide, Nylon 6 Polyester, PET Polyester, PETG MMA Butadiene Styrene (MBS) Ethylene Vinyl Alcohol (EVOH) Polymethylpentene (PMP) Polypropylene Adipate Naphthalenesulfonic Acid Trixylenyl Phosphate Sodium Dodecylbenzenesulfonate Tetrabromoethane... 

To get improved chemical resistance replace a monomeric plasticizer, such as dioctyl phthalate (DOP), with a polymeric type, for example, polypropylene adipate (PPA) or polypropylene sebacate (PFS). PPAis useful for oil and fuel contact and PPS resist soaps and detergents. 

---