This paper describes a new Baytec® MAX (MDI amine crosslinked) prepolymer product line, consisting of novel polyester and polyether prepolymers produced from diphenylmethanediisocyanate. These prepolymers demonstrate reactivities similar to that of corresponding, free-monomer stripped 2,4- TDI prepolymers when extended with diamine co-reactants such as MbOCA and MCDEA, and produce polyurethaneurea elastomers with comparable physical properties.

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This technical brochure describes the process of producing Baytec® MAX elastomers from Desmodur VP.PU MS and Desmodur VP.PU ME line of prepolymers and diamine curing agents. Selected formulations and corresponding elastomeric properties are provided. We recommend a careful review of this brochure prior to production so as to avoid mistakes commonly encountered during elastomer production.

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Solid polyurethane elastomers that resist permanent deformation when subjected to compressive loads are widely used in applications such as gaskets, sealing rings, and load-bearing pads. These are usually obtained from high performance elastomers such as Vulkollan® and those based on prepolymers of MDI and TDI. These elastomers are characterized by a high degree of phase separation of the soft and hard segments and show very low compression sets besides their high resilience, abrasion resistance and overall superior mechanical properties.

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