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Ambient or low-temperature curable coatings
| Details |
Inventors: Emmons, William D.;
Assignee: Rohm and Haas Company (Philadelphia, PA)
Primary Examiner: Lusignan; Michael R.
Assistant Examiner:
Attorney, Agent or Firm: Johnson; Lester E., Steinmeyer; Robert J., Vanderburgh; John E., Frieman; Robert S.
Ambient or low-temperature curable solutions or aqueous dispersions of (1) a polymer containing units polymerized from a monomer mixture of (a) from about 0.25% to about 30% by weight of a polymerizable aldehyde, and (b) at least one copolymerizable mono-ethylenically unsaturated monomer, with (2) a curing agent selected from the group of dicarboxylic acid bis-hydrazides, dicarboxylic acid bis-hydrazones, and acrylic oligomers and low molecular weight acrylic solution polymers containing a plurality of pendant hydrazide or hydrazone groups. The solutions or dispersions are useful as general industrial coatings, maintenance coatings, furniture and appliance coatings, heavy transportation coatings, automobile refinishes and plastics coatings. |
|
DETAILED DESCRIPTION What is claimed is: 1.
An ambient or low-temperature curable polymer composition adapted to coat a rigid substrate comprising: a.
a polymer polymerized from a monomer mixture comprising (1) from about 0.
25% to about 35% by weight of a polymerizable aldehyde, and (2) at least one copolymerizable mono-ethylenically unsaturated monomer selected from the group consisting of .
alpha.
,.
beta.
-ethylenically unsaturated carboxylic acid, (C.
sub.
1 -C.
sub.
24)alkyl methacrylates, (C.
sub.
1 -C.
sub.
24)alkyl acrylates, vinylidene halides, vinyl halides, (meth)acrylonitrile, vinyl esters, ethylene and alpha-olefins, acrylic and methacrylic acid esters of alcohol-ethers, vinyl ether, styrene and alkyl-substituted styrenes and vinyl aromatics, the combination of monomers being selected to provide a T.
sub.
g of the polymer of greater than about 0.
degree.
C.
; and b.
a curing agent comprising a member selected from the group consisting of a dicarboxylic acid bis-hydrazide represented by the formula, H.
sub.
2 N--NH--C(O)--R--C(O)--NH--NH.
sub.
2, and a dicarboxylic acid bis-hydrazone represented by the formula R.
sup.
1 R.
sup.
2 C.
dbd.
N--NH--C(O)--R--C(O)--NH--N.
dbd.
CR.
sup.
1 R.
sup.
2, and acrylic oligomers and low molecular weight acrylic solution polymers containing a plurality of pendant hydrazide groups of the formula --C(O)--NH--NH.
sub.
2 or hydrazone groups of the formula --(O)--NH--N.
dbd.
CR.
sup.
1 R.
sup.
2, wherein R is a member selected from the group consisting of a divalent alkylene group or alicyclic group having from 0 to 34 carbon atoms and a divalent aromatic ring and R.
sup.
1 and R.
sup.
2 are selected from the group consisting of H and (C.
sub.
1 -C.
sub.
6) alkyl and alicyclic groups, the amount of hydrazide or hydrazone compound being selected to provide a ratio of hydrazide or of hydrazone groups to aldehyde groups of the polymer in the dispersion of from about 1:2 to 2:1.
2.
The composition of claim 1 wherein the polymer component comprises an aqueous emulsion polymer containing from about 30% to about 60% by weight resin solids polymerized from a monomer mixture comprising (1) from about 0
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