Curable polyurethanes

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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Details

C525S126000, C525S455000, C525S460000, C528S070000, C528S076000

Reexamination Certificate

active

10177859

ABSTRACT:
Curable (per)fluoropolyether polyurethanes obtained by reaction in a first step ofa) (per)fluoropolyether diols having a number average molecular weight from 2,000 to 5,000;withb) diisocyanates of formulain-line-formulae description="In-line Formulae" end="lead"?OCN—R—NCO   (VIA)in-line-formulae description="In-line Formulae" end="tail"?wherein R is a hydrogenated and/or fluorinated radical;in a second step with the compoundc) saturated or unsaturated aliphatic hydrogenated diols, (alkyl)cycloaliphatic, aromatic; oligomers or polymers of butadiene with a number average molecular weight from 500 to 4,000 having end hydroxyl groups;provided that:when the diisocyanate b) is used and the radical R in formula (VIA) is: —Ph—CH2—Ph—, the hydrogenated diols c) are optional;when the radical R has a meaning different from that above mentioned, at least one of the used hydrogenated diols c) is selected from those belonging to the c2)-c6) groups;the sum of the equivalents of the compounds a) and c) being equal to the equivalents of the compound b).

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