Fluorinated polyurethanes endowed with improved mechanical prope

Details Fluorinated polyurethanes endowed with improved mechanical prope Fluorinated polyurethanes endowed with improved mechanical prope

1989-09-15

1991-06-25

Welsh, Maurice J.

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...

528 65, 528 70, C08G 1830

Patent

active

050268147

ABSTRACT:
The invention relates to polyurethanes comprising polyoxyperfluoroalkylene blocks of rubber-like nature and rigid segments derived from short-chain aliphatic diols, optionally from aliphatic diamines, and from aliphatic or cycloaliphatic or aromatic diisocyanate. The number of the rigid-type segments is equal to or greater than the number of the polyoxyperfluoroalkylene blocks. The polyurethane are characterized by a glass transition temperature lower than -80.degree. C., a tensile strength greater than 30 kg/cm.sup.2, a hardness between 50 Shore A and 75 Shore D, and good thermoforming characteristics.

REFERENCES:
patent: 4782130 (1988-11-01), Re et al.
patent: 4863986 (1989-09-01), Re et al.

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