Prepolymer compositions and sealants made therefrom

Details Prepolymer compositions and sealants made therefrom Prepolymer compositions and sealants made therefrom

2006-01-24

2006-01-24

Gorr, Rachel (Department: 1711)

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

Synthetic resins

From silicon reactant having at least one...

C528S045000, C524S323000, C524S736000

Reexamination Certificate

active

06989429

ABSTRACT:
Prepolymer compositions for preparing a one-part, moisture-curable sealant, adhesive or coating, and a method of making such prepolymer compositions are provided. The prepolymer compositions comprise a polyurethane prepolymer that is end-capped with silane groups or a combination of silane groups and end capping groups that have been derived from an alcohol and an amount, referred to hereinafter as an “excess”, of unreacted aromatic alcohol having a molecular weight of less than 2000. The excess of unreacted aromatic alcohol in the composition is from greater than 0% to 15% by mole of the level of original NCO groups in the prepolymer. From 50 to 100% of the original NCO groups are end-capped with silane groups, and from 0 to 50% of the original NCO groups are end-capped with a end-capping group that has been derived from an aromatic alcohol, an aliphatic alcohol or both. Sealant compositions and coating compositions comprising the present prepolymer composition are also provided.

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patent: 4857623 (1989-08-01), Emmerling et al.
patent: 6162938 (2000-12-01), Hansen et al.
patent: 6498210 (2002-12-01), Wang et al.
patent: 0 343 523 (1989-11-01), None
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