Low free MDI prepolymers for rotational casting

Low free MDI prepolymers for rotational casting

  • CN 104,736,586 A
  • Filed: 01/20/2014
  • Published: 06/24/2015
  • Est. Priority Date: 01/30/2013
  • Status: Active Application
First Claim
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1. a polyurethane prepolymer compositions, comprises:

  • A) a kind of isocyanate-terminated polyurethane prepolymer;

    Wherein, this isocyanate-terminated polyurethane prepolymer comprises a kind of organic diisocyanate monomer and a kind of reaction product being selected from the polyvalent alcohol of the group be made up of the following;

    ethylene glycol, Diethylene Glycol, dipropylene glycol, neopentyl glycol, 1,3-butyleneglycol, 1,4-butyleneglycol, polytetramethylene ether diol (PTMEG), polypropylene glycol and dihydroxyl polyesterThis organic diisocyanate monomer comprises 4,4'"'"'-bis-isocyanato ditane (MDI), and this prepolymer comprises the free MDI monomer being less than 1.0% based on this prepolymer gross weight by weight,AndB) solidifying agent, this solidifying agent comprises i) a kind of polyvalent alcohol;

    Ii) a kind of aromatic diamine;

    And a kind of thixotropic agent, iii) a kind of thixotropic aliphatic amide;

    And iv) a kind of thixotropic colloidal additive.

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