Polyether allophanates stable towards discolouration

Details Polyether allophanates stable towards discolouration Polyether allophanates stable towards discolouration

2006-05-02

2006-05-02

Sergent, Rabon (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C252S182200, C252S182210, C252S182220, C252S182290, C528S048000, C528S059000, C528S061000, C528S065000, C528S067000, C528S076000, C560S026000, C560S115000, C560S158000, C560S330000, C560S331000, C560S336000, C560S355000, C564S044000, C564S045000

Reexamination Certificate

active

07038003

ABSTRACT:
A process for preparing polyisocyanate prepolymers containing allophanate structural units that includes reactinga) one or more polyisocyanates withb) one or more polyetherpolyols containing less than or equal to 0.02 milliequivalent of unsaturated end groups per gram of polyol and having a polydispersity of from 1.0 to 1.5 and/or an OH functionality of greater than or equal to 1.9 to provide an NCO-functional polyurethane prepolymer containing urethane groups that are partly or fully allophanatized by further reaction withc) polyisocyanates, which may be different from those from a), andd) catalysts and optionally addinge) acidic additives before, during and/or after the allophanatization. The polyisocyanate prepolymers can be used to produce coatings, adhesive bonds and/or seals. The coatings include one or more of the polyisocyanate prepolymers, and at least one diol or polyol and/or at least one linear and/or cyclic, aliphatic, araliphatic and/or aromatic diamine or polyamine.

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