Thixotropic agent for use in coating compositions
AssigneeByk-Mallinckrodt Chemische Produkte GmbH
InventorsKarlheinz Haubennestel, Rainer Mehren
Life of this patent
Estimating the term…
Abstract
Thixotropic compositions comprising a solution of a urea urethane having the formula as hereinafter set out dissolved in a polar aprotic solvent containing 0.1-2.0 mol LiCl per urea group: R--O--CO--NH--R'--NH--CO--NH--R"--NH--CO--NH--R'--NH--CO--OR wherein R represents C.sub.n H.sub.2n+1 -- or C.sub.m H.sub.2m+1 (C.sub.p H.sub.2p O).sub.r --; n represents an integer having a value of from 4 to 22; m represents an integer having a value of from 1 to 18; p represents an integer having a value of from 2 to 4; and r represents an integer having a value of from 1 to 10. ##STR1## The solids content in the aprotic solvent amounts to 10-75 wt. % and preferably to from 40-60 wt. %.
Claims13
Thixotropic compositions which manifest thixotropic properties only upon subsequent introduction into coating compositions, comprising urea urethanes of the following formula dissolved in a polar aprotic solvent containing 0.1 to 2.0 mol LiCl per urea group
- R--O--CO--NH--R'--NH--CO--NH--R"--NH--CO--NH--R'--NH--CO--OR
- wherein R represents C.sub.n H.sub.2n+1 -- or C.sub.m H.sub.2m+1 (C.sub.p H.sub.2p O).sub.r --;
- n represents an integer having a value of from 4 to 22;
- m represents an integer having a value of from 1 to 18;
- p represents an integer having a value of from 2 to 4;
- and r represents an integer having a value of from 1 to 10, ##STR3##
Dependencies are inferred from the claim text.