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Elmet Technologies
Northstar Polymers MPA-221 Polyether Based MDI Prepolymer
Categories: Polymer; Thermoset

Material Notes: MPA-221 is polyether based MDI prepolymer with 1.9% free NCO. The composition mole ratio between MDI to polyol is approximately 2:1, which theoretically makes prepolymer with molecular structure having a long polyol chain sandwiched by two NCO groups. The theoretical functionality of MPA-221 is very close to 2.0. This makes MPA-221 a good prepolymer to modify full-prepolymer systems and moisture cure systems to yield softer films. The polyether polyol used in this formulation is more apolar, and it has good affinity to a wide range of prepolymer species and good moisture permeation for moisture-cure adhesives and coatings. The viscosity of MPA-221 can be reduced to the range easier to process by heating.

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Plastic

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Elmet Technologies
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