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Pigment dispersions exhibiting improved compatibility in polyurethane systems
| Details |
Inventors: Wildeman, George F.; Virant, Allen J.;
Assignee: Plasticolors, Inc. (Ashtabula, OH)
Primary Examiner: Willis; Prince E.
Assistant Examiner: Thompson; Willie J.
Attorney, Agent or Firm: Renner, Otto, Boisselle & Lyon
A method is described for improving the compatibility of pigments and, optionally, stabilizers in the polyol-containing component of two- and three-component polyurethane systems. The method comprises (A) preparing a dispersion comprising at least one pigment in at least one glycol, and (B) blending said dispersion with the polyol component. In a preferred embodiment, the glycol of the dispersion is identical to the glycol used as the chain extender in the polyol component of the urethane system. The pigment dispersions also may contain at least one stabilizer for the urethane including heat stabilizers and ultraviolet light stabilizers. Compositions are described which comprise at least one pigment and at least one heat and/or ultraviolet light stabilizing compound dispersed in a glycol. Such dispersions exhibit improved compatibility with the polyol component thereby minimizing settling of the pigment resulting in a reduction in the clogging of filters used in the urethane reaction. The improved compatibility also results in the reduction or elimination of color streaking in the urethane product. |
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DETAILED DESCRIPTION We claim: 1.
A method for improving the compatibility of pigments in the polyol-containing component of a two-component polyurethane system comprising (A) preparing a dispersion comprising at least one pigment in at least one glycol, and (B) blending said dispersion with the polyol component.
2.
The method of claim 1 wherein the dispersion comprises from about 10% to about 75% of pigment and from 25% to about 90% of glycol.
3.
The method of claim 1 wherein the glycol is ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, or 1,6-hexanediol.
4.
The method of claim 1 wherein the glycol is ethylene glycol.
5.
The method of claim 1 wherein the pigments are color pigments.
6.
The method of claim 1 wherein the polyol component contains at least one polyester polyol or polyether polyol.
7.
The method of claim 1 wherein the polyol component contains a polyester polyol and a glycol chain extender.
8.
The method of claim 7 wherein the chain extender is ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol or 1,6-hexanediol.
9.
The method of claim 7 wherein the glycol chain extender is ethylene glycol.
10.
The method of claim 7 wherein the glycol chain extender is ethylene glycol and the glycol used to form the pigment dispersion is ethylene glycol.
11.
The method of claim 1 wherein at least one heat and/or ultraviolet stabilizer is incorporated into the pigment dispersion prior to mixing with the polyol component.
12.
The method of claim 11 wherein the heat and/or ultraviolet stabilizers are (1) hindered amine light stabilizers, (2) formamidines of the formulae ##STR14## wherein R.
sub.
1 is an alkyl group containing 1 to about 5 carbon atoms; Y is a H, OH, Cl or an alkoxy group; R.
sub.
2 is a phenyl group or an alkyl group containing 1 to about 9 carbon atoms; X is selected from the group consisting of H, carboalkoxy, alkoxy, alkyl, dialkylamino and halogen; and Z is selected from the group consisting of H, alkoxy and halogen, or ##STR15## wherein A is --COOR, --COOH, --CONR'R", --NR'COR, --CN, or a phenyl group; and wherein R is an alkyl group of from one to about 8 carbon atoms; R' and R" are each independently hydrogen or lower alkyl groups of from 1 to about 4 carbon atoms, or (3) hindered phenolic antioxidants, or mixtures of two or more of (1), (2) and (3)
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Quantum Computing 
