Liquid properties of PEER Resins

PEER polymers can be cured with traditional radical initiators such as methyl ethyl ketone (MEK) peroxides and benzoyl peroxide (BPO). Curing can be carried out either at room temperature or at elevated temperature. A PEER polymer containing 30 % maleic anhydride can be cured at room temperature with MEK peroxides in 10 to 60 min, depending on the type of peroxide used (Table 22.2). To cure a PEER resin with MEK peroxides at room temperature, a co-catalyst is needed. The commonly used cobalt naphthenate works very well in this case, while another co-catalyst, dimethyl aniline, is very efficient for the BPO system. 

There was always the question about the effect of the different polyether polyol on the PEER polyester. Originally, it was suspected that high-ethylene-oxide-content polyethers may produce less fumarate in the polyester and thus will cure 

Polyol Gel time (min) Cure time (min) Exotherm (°F) Inhibitor (ppm) 

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PEER POLYMERS NEW UNSATURATED POLYESTERS 3.4 LIQUID PROPERTIES OF PEER RESINS... 

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