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Thermosetting vinyl chloride polymer powder coatings
| Details |
Inventors: Hagan, Joseph Weldon;
Assignee: Union Carbide Corporation (New York, NY)
Primary Examiner: Woodberry; Edward M.
Assistant Examiner:
Attorney, Agent or Firm: Fazio; Francis M.
Powder coating compositions of blends of (1) vinyl chloride polymers having pendant hydroxyl groups, (2) a suitable crosslinker and (3) cellulose acetate butyrate have been produced and applied to a substrate and cured to form smooth, uniform coatings. The compositions can also contain certain blocked catalysts for improved cure. |
|
DETAILED DESCRIPTION What I claim is: 1.
A thermosetting vinyl chloride polymer powder coating composition comprising finely divided particles; wherein the powder particles are of a blend of constitutents consisting essentially of: A.
40 to 90 percent by weight of said composition of a vinyl chloride polymer having pendant hydroxyl groups consisting essentially of i.
75 to 95 percent of weight, based on the weight of said vinyl chloride polymer, of vinyl chloride, ii.
2 to 20 percent by weight, based on the weight of said vinyl chloride polymer, of an hydroxyalkyl acrylate having from 2 to 6 carbon atoms in the alkyl group, or the vinyl alcohol moiety, iii.
0 to 23 percent by weight, based on the weight of said vinyl chloride polymer, of vinyl acetate; wherein the vinyl chloride polymer has a number average molecular weight of from 5,000 to 25,000 and a glass transition temperature above 40.
degree.
C.
; B.
3 to 60 percent by weight of said vinyl chloride polymer of a melamine formaldehyde resin, urea formaldehyde resin, phenol formaldehyde resin, or blocked isocyanate crosslinker; and C.
10 to 30 percent by weight of said composition of cellulose acetate butyrate having a butyral content of from 45 to 60 percent.
2.
A thermosetting vinyl chloride polymer powder coating composition as claimed in claim 1, wherein a blocked acid catalyst is additionally present at a concentration of from 0.
01 to 1 percent by weight, based on the weight of said composition.
3.
A thermosetting vinyl chloride polymer powder coating composition as claimed in claim 1, wherein component (A) is an 80/5/15 vinyl chloride/vinyl acetate/2-hydroxypropyl acrylate polymer.
4.
A thermosetting vinyl chloride polymer powder coating composition as claimed in claim 1, wherein component (B) is hexamethoxymethylmelamine.
5.
A thermosetting vinyl chloride polymer powder coating composition as claimed in claim 2, wherein the catalyst is an alkyl ester of p-toluene sulfonic acid having from 1 to 4 carbon atoms in the alkyl group.
Description:
BACKGROUND OF THE INVENTION The coatings industry is undergoing massive changes in its philosophy, a great deal thereof being the result of the ecological problems associated with the use of the conventional solvent-based coating compositions
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Molecular Biology 
