Patent · US Expired

Impregnating agent and its use

US4826948A · kind A · utility

2Cited by

1References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Bernhard Jansen · Cologne, DE
Hanns P. Muller · Leverkusen, DE
Roland Richter · Cologne, DE
Dietmar Schapel · Cologne, DE
Rudolf Schmidt · Giengen an der Brenz, DE

Key dates

Filing date	May 20, 1988
Grant date	May 2, 1989
Priority date	—
Expiry date	May 20, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/78
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Impregnating agents are provided consisting essentially of PA0 (a) an NCO-prepolymer or NCO-semi-prepolymer which is curable by atmospheric moisture, with an NCO content of 2 to 25% by weight, based on PA1 (a1) an organic polyisocyanate PA2 and PA1 (a2) a compound with at least 2 alcohol hydroxyl groups, PA0 (b) a solvent which is inert with respect to isocyanate groups in which the (a1) organic polyisocyanate is a polyisocyanate with exclusively aliphatically or cycloaliphatically bound isocyanate groups and the a2) polyhydroxyl compound is a polysiloxane of the molecular weight range of 300 to 5000 which has at least 2 alcoholically bound hydroxyl groups. A method of impregnating mineral substrates with such impregnating agents is also provided.

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