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US 7,923,574 B2Granted
Prepolymers
AssigneeBayer MaterialScience AG
InventorsMarc Leimenstoll, Burkhard Köhler, Christos Karafilidis, Matthias Wintermantel
Life of this patent
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Abstract
The invention relates to novel prepolymers which are accessible from the formamides of oligomeric di- or polyamines (formamide-terminated oligomers) and di- or polyisocyanates.
Claims13
A prepolymer of diisocyanates and formamide-terminated oligomers, wherein said prepolymer is of formula (I)
- X—[—N(CHO)—CO—NH—R1—NCO]n (I)
- wherein
- R1 is a C6-C13-arylalkyl radical or a C4-C13-alkylene radical;
- n is a natural number from 2 to 4;
- X is an n-valent organic radical.
2 more elements
Dependencies are inferred from the claim text.