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
2006-08-30
2010-10-12
Zimmer, Marc S (Department: 1796)
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...
C525S038000, C525S453000, C528S026000, C528S025000, C528S028000, C528S065000, C528S038000
Reexamination Certificate
active
07812087
ABSTRACT:
The present invention relates to modified alkoxysilane-functional polyurethanes containing allophanate and/or biuret groups, wherein at least 10 mol % of the allophanate and/or biuret groups are formed from a monoisocyanate of the formula R—NCO, wherein R is an optionally heteroatom-containing alkyl, aralkyl or aryl radical having up to 20 carbon atoms, provided that these radicals do not contain any other reactive groups with the exception of the NCO group that is part of the allophanate structure and any alkoxysilyl groups present. The present invention also relates to a process for preparing alkoxysilane-functional prepolymers byA) reacting some or all of the urethane groups and/or urea groups of alkoxysilane-functional polyurethane prepolymers with monoisocyanates of the formula, R—NCO to form allophanate groups and/or biuret groups, orB) reacting some or all urethane groups and/or urea groups of alkoxysilyl-free polyurethane prepolymers with monoisocyanates of the formula R—NCO to form allophanate groups and/or biuret groups, the radical R having at least one alkoxysilyl group.The present invention further relates to sealants, adhesives, primers and coatings based on the polyurethane prepolymers of the invention.
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Adhesives Age, Apr. 1995, Dr. Ta-Min Feng et al, p. 30-32, “Silylated Urethane Polymers Enhance Properties of Construction Sealants”.
Ludewig Michael
Matner Mathias
Bayer MaterialScience AG
Cheung Noland J.
Frank Noah
Klemz Robert S.
Zimmer Marc S
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