Polyurethane, method for production and use thereof

Details Polyurethane, method for production and use thereof Polyurethane, method for production and use thereof

2005-08-16

2005-08-16

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...

C528S080000

Reexamination Certificate

active

06930161

ABSTRACT:
A self-crosslinking, branched polyurethane preparable by reacting(A) at least one hydroxyl-terminated polyester with a number-average molecular weight of from 500 to 4000 daltons, containing based on the polyester (A)(a1) from 60 to 95% by weight of structural units derived from aliphatic starting products and(a2) from 5 to 40% by weight of structural units derived from aromatic starting productswith(B) at least one partially blocked polyisocyanate containing on average per molecule more than 1.5 and less than 3 free isocyanate groups,the equivalents ratio of free isocyanate groups in the polyisocyanate (B) to hydroxyl groups in the polyester (A) being >1, to give an isocyanato-terminated polyurethane prepolymer which is chain-extended and/or blocked with(C) at least one compound containing on average per molecule at least two isocyanate-reactive functional groups;process for its preparation, and its use as a binder in coating materials, adhesives, and sealing compounds.

REFERENCES:
patent: 4532177 (1985-07-01), Mahar
patent: 6583214 (2003-06-01), Haeberle et al.
patent: 6586523 (2003-07-01), Blum et al.
patent: 19914896 (1999-04-01), None
patent: 0583777 (1994-02-01), None
patent: 1280404 (1972-07-01), None
patent: 05005080 (1993-01-01), None

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