Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
2007-12-18
2007-12-18
Zimmer, Marc S. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S026000, C528S038000, C528S044000, C528S067000, C528S069000, C528S076000, C528S085000
Reexamination Certificate
active
10539218
ABSTRACT:
A process for preparing a moisture-curable, polyether urethane containing terminal cyclic urea/reactive silane groups by reacting at an NCO:OH equivalent ratio of 1.5:1 to 2.5:1a) a hydroxyl component containing i) a polyether containing two hydroxyl groups and one or more polyether segments, wherein the polyether segments have a number average molecular weight of at least 3000 and a degree of unsaturation of less than 0.04 milliequivalents/g, and ii) a polyether containing one hydroxyl group and one or more polyether segments having a number average molecular weight of 1000 to 15,000, withb) an isocyanate component containing i) a compound containing two isocyanate groups, and ii) a compound containing one isocyanate group, and subsequently reacting this reaction product at an equivalent ratio of isocyanate groups to isocyanate-reactive groups of 0.8:1 to 1.1:1 withc) a compound containing an aspartate group and a reactive silane group to form an intermediate polyether urethane containing terminal non-cyclic urea/reactive silane groups and converting the non-cyclic urea groups to cyclic urea groups by reacting the intermediate polyether urethane.
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Crawford Derek L.
Roesler Richard R.
Bayer MaterialScience LLC
Cheung Noland J.
Whalen Lyndanne M.
Zimmer Marc S.
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