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...
Reexamination Certificate
2006-12-05
2006-12-05
Gorr, Rachel (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...
C528S064000
Reexamination Certificate
active
07144969
ABSTRACT:
The present invention relates to a polyureaurethane wherein the prepolymer comprising said polyureaurethane has a NCO to OH equivalent ratio of from 2.0 to less than 2.5. In an embodiment, the polyureaurethane prepolymer comprises a polyisocyanate and at least one OH-containing material, which can be reacted with an amine-containing curing agent to produce the polyureaurethane of the present invention.
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Z87.1-200X, Sep. 12, 2002, Committee Ballot Draft Revision of ANSI Z 87.1-1989 (R1998), Sections 7.5.2.1 “High Velocity Impact” and 14.3 “Test for High Impact Prescription Lenses”.
Altman Deborah M.
Gorr Rachel
Marmo Carol A.
PPG Industries Ohio Inc.
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