Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2006-05-16
2006-05-16
Gorr, Rachel (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C528S076000, C528S077000, C528S061000, C002S167000, C128S844000, C428S036800
Reexamination Certificate
active
07045573
ABSTRACT:
Isocyanate-functional polyurethane prepolymers and aqueous dispersions therefrom which are useful for the production of flat materials having excellent resistance to alcoholic solvents are described. The prepolymers are prepared by reacting:A) an isocyanate selected from the group consisting ofi) an aliphatic and/or a cycloaliphatic isocyanate,ii) a mixture of an aromatic isocyanate and an aliphatic and/or a cycloaliphatic isocyanate,B) a di- or polyhydroxy compound having a number average molecular weight of from 700 to about 16,000, andC) optionally, a dihydroxy and/or polyhydroxyl compound having a number average molecular weight of less than 700, with the provisos thata) at least one of components A), B or C) has a functionality of more than 2 andb) if both component A) and component B) are difunctional, component C) cannot be a trihydroxy component of the formula:in-line-formulae description="In-line Formulae" end="lead"?R—(OH)3in-line-formulae description="In-line Formulae" end="tail"? where R is a saturated straight chain or branched chain aliphatic group of from 2 to 8 carbon atoms.
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Berezkin Yuliya
Crisci Mary A.
Mayer Eduard
Muenzmay Thomas
Roesler Richard R.
Bayer MaterialScience AG
Bayer MaterialScience LLC
Gil Joseph C.
Gorr Rachel
Roy Thomas W.
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