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 Polyisocyanates

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  • Polyisocyanates: Species possessing free isocyanate groups and derived from monomeric isocyanates either by directly linking these monomeric units (a homopolymer) or by reacting these monomers with di- or poly-functional alco­hols or amines (a copolymer).
  • For highly elastic coatings with resistance to accelerated and outdoor weathering; combination with suitable polyisocyanates allows variation of the elasticity using the same polyol mill base Polyurethanes based on aliphatic polyisocyanates are well known for their outstanding properties, especially for their exceptional resistance to weathering.
  • Polyisocyanates - Quantifying polyisocyanates is much more complex.There are currently three potential approaches used to quantify and express concentrations of polyisocyanates; the pure product mass, the NCO group concentration or mass, and the monomer equivalent mass.
  • Polyisocyanate which is also insoluble in water.
  • Isocyanates are chemicals containing the highly reactive isocyanate group. When there are two or more isocyanate groups on a molecule (diisocyanates or polyisocyanates), they can link together with certain other molecules to form long chained polymers called polyurethanes.
  • Polyisocyanates may elicit four major types of reactions in the lower respiratory tract:
    1. Toxic bronchitis with asthma, also called reactive airways dysfunction syndrome (RADS), caused by very high exposure levels.
    2. Bronchial asthma caused by sensitization to diisocyanates, where very low exposure levels may provoke symptoms.
    3. Accelerated decline in FEV1
    4. Extrinsic allergic alveolitis like e.g. in “bathtub refinisher´s lung”
  • The polyisocyanate Compositions Are Useful in the Preparation Of Elastomeric Products

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