Fluorinated polyurethanes endowed with improved mechanical properties, containing rubber-like polyoxyperfluoroalkylene-structure blocks and hydrogenated rigid blocks
US5026814A · kind A · utility
38Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Sep 15, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.