Patent · US Expired

Transparent cover for transparent substrates

US4826914A · kind A · utility

8Cited by

3References

6Claims

0Family size

Assignee

Saint-Gobain Vitrage · FR

Inventors

Helmer Raedisch
Gerhard Holzer · Aachen, DE
Udo Gelderie · Stolberg, DE
Kornelia Breuer · Aldenhoven, DE

Key dates

Filing date	Oct 6, 1987
Grant date	May 2, 1989
Priority date	—
Expiry date	Oct 6, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L75/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A transparent cover layer of a soft elastic polyurethane for windshields or other transparent glass or plastic substrates. In order to give the cover layer an anti-fogging effect, the polyol component of the reaction mixture for the manufacture of the cover layer contains a difunctional sulfonated polyether polyol or a difunctional polyether polyol containing sulfonate groups having 0.5 to 13.2 percent by weight of OH groups and an average molecular weight of about 250 to 6500 g/mol, a trifunctional polyol having 5.1 to 12.8 percent by weight of OH groups and an average molecular weight of from 400 to about 1000 g/mol, as well as a non-ionic polyetherpolysiloxane having an average molecular weight of from 500 to 2000 g/mol.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.