Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1997-03-07
2002-03-19
Niland, Patrick D. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S507000, C524S539000, C524S589000, C524S591000, C525S123000, C525S127000, C525S128000, C525S131000, C525S452000, C525S453000, C525S454000, C525S455000, C525S457000, C525S458000, C525S459000, C528S044000, C528S045000, C528S048000, C528S049000
Reexamination Certificate
active
06359059
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to paint compositions, and more particularly to automotive paint compositions having low volatile organic content (VOC).
Automotive paint compositions according to the present invention comprise pigmented single stage topcoat formulations and clear coat formulations which contain reactive urea/urethanes (RUU's) that can be made to contain low VOC.
BACKGROUND OF THE INVENTION
The present invention is directed to automotive paint compositions, particularly those that have a high solids content and low VOC properties. Typically, low VOC coatings have been found to exhibit below average drying and curing properties when compared to conventional automotive coatings with long dust-free and tack-free times and short pot and shelf life. According to one aspect of the present invention, improved low VOC coating compositions with improved drying, curing and durability are disclosed.
Any substrate material can be coated with the coating composition according to the present invention. These substrate materials include such things as glass, ceramics, paper, wood, and plastic. The coating system of the present invention is particularly adapted for metal substrates, and specifically as an automotive re-finish system. The substrate may be uncoated material or can be primed. The substrate may also be coated with paint products applied at the time of manufacture. The coating composition can be applied using conventional spray equipment or high volume low pressure spray equipment resulting in a high quality finish. Other modes of application are roller coating, brushing, sprinkling, flow coating, dipping, electrostatic spraying, or electrophoresis. Exemplary metal substrates include such things as steel, aluminum, copper, zinc, magnesium and alloys thereof. The components of the compositions can be varied to suit the temperature tolerance of the substrate material. For example, the components can be constituted for air drying (e.g. less than 100° F.), low temperature cure (e.g.100° F.-180° F.), or high temperature cure ( e.g. over 180° F.).
SUMMARY OF THE INVENTION
The present invention relates to a novel coating composition comprising:
a) 5-65 percent by total weight of a crosslinkable co-vehicle,
b) 10 to 50 percent by total weight of an organic solvent,
c) 1 to 90 percent by total weight of a reactive urea/urethane,
d) 0 to 30 percent by total weight of a reactive diluent,
e) 10 to 50 percent by total weight isocyanate crosslinker,
f) 0 to 10 percent by total weight of additives,
g) 0 to 35 percent by total weight pigments.
According to one aspect of the present invention, improved low VOC coating compositions with improved drying, curing, durability are disclosed.
The coating compositions of the present invention can be used as the basecoat of pigmented basecoat/clearcoat coating, as a pigmented single stage colorcoat, or as the clearcoat of a basecoat/clearcoat coating. It is preferred to use the coatings of the present invention as a single stage colorcoat and the clearcoat of a basecoat/clearcoat coating. Although the single stage colorcoat and the clearcoat of a basecoat/clearcoat coating is preferred, it will be appreciated that the coatings described herein are not intended to limit the utility of the reactive urea/urethane.
The coating composition useful to form the single stage topcoat formulation as well as basecoat formulations and clearcoat formulations are typically made from copolymer compositions characterized as polymerization products of ethylenically unsaturated monomers containing hydroxyl groups and other vinyl monomers wherein the copolymer components are combined in such a manner to give a polymer with a moderate glass transition temperature preferably between about −3° C. to about 35° C. (using the Fox method of Tg calculation) and a relative weight average molecular weight of less than 10,000. The molecular weight is preferably from about 1,000-7,000 based on GPC using polystyrene standards. The hydroxyl number is preferably between 75 and 175 (mg KOH per gram of non-volatile resin). The acid number is preferably between 0 and 10 (mg KOH per gram of non-volatile resin). The ethylenically unsaturated monomers may be selected from, but are not limited to the group essentially consisting of: ethylene and/or ethylenically unsaturated alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, 2-propyl (meth)acrylate, butyl (meth)acrylate, 2-butyl(meth)acrylate, 2-methylpropyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, lauryl (meth)acrylate, octyl (meth)acrylate, decyl (meth)acrylate, stearyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, and isobornyl (meth)acrylate; aryl monomers such as styrene, alpha-methyl styrene, vinyl toluene, t-butyl styrene, benzyl (meth)acrylate, and 2-benzylethyl (meth)acrylate; hydroxy monomers such as hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, sec-hydroxybutyl (meth)acrylate, and hydroxyoctyl (meth)acrylate; acid functional monomers such as acrylic acid and methacrylic acid as described in related copending U.S. application Ser. No. 353,990 filed May 19, 1989 and incorporated herein by reference, hereinafter described as acrylic solution #1.
DESCRIPTION OF PREFERRED EMBODIMENT
The present invention relates to a novel coating composition comprising:
a) 5-65 percent by total weight of a crosslinkable co-vehicle,
b) 10 to 50 percent by total weight of an organic solvent,
c) 1 to 90 percent by total weight of a reactive urea/urethane,
d) 0 to 30 percent by total weight of a reactive diluent,
e) 10 to 50 percent by total weight isocyanate crosslinker,
g) 0 to 10 percent by total weight of additives,
h) 0 to 35 percent pigments.
According to one aspect of the present invention, improved low VOC coating compositions with improved drying, curing, durability are disclosed.
It is preferred to use the coatings of the present invention as a single stage colorcoat and the clearcoat of a basecoat/clearcoat coating. Although the single stage colorcoat and clearcoat is preferred, it will be appreciated that the coatings described herein are not intended to limit the utility of the reactive urea/urethanes.
Especially preferred are low VOC single stage topcoats comprising about 25 to 50 percent crosslinkable co-vehicle, 10 to 50 percent solvents, 1 to 60 percent reactive urea/urethane, 0 to 30 percent reactive diluent, 10 to 50 percent crosslinking agents, 0 to 10 percent additives such as accelerators, mar and slip agents, flow modifiers, anti-settle agents, wetting agents, ultra-violet light absorbers and stabilizers and 0.1 to 35 percent pigments and low VOC clearcoats comprising about 25 to 50 percent crosslinkable co-vehicle, 10 to 50 percent solvents, 1 to 60 percent reactive urea/urethane, 0 to 30 percent reactive diluent, 10 to 50 percent crosslinking agents, and 0 to 10 percent additives such as accelerators, mar and slip agents, flow modifiers, anti-settle agents, wetting agents, ultra-violet light absorbers and stabilizers.
Preferred crosslinkable co-vehicles, when crosslinked with isocyanate crosslinker, form coatings which have excellent physical properties with short tack-free and dust-free time, excellent pot-life, and no strong odor. A useful crosslinkable co-vehicle can essentially consist of the polymerization product of ethylenically unsaturated monomers containing hydroxyl groups and other vinyl monomers wherein the copolymer components are combined in such a manner to give a polymer with a moderate glass transition temperature preferably between about −3° C. to about 35° C. (using the Fox method of Tg calculation) and a relative weight average molecular weight of less than 10,000. The molecular weight is preferably from about 1,000-7,000 based on GPC using polystyrene standards. The hydroxyl number is preferably between 75 and 175 (mg KOH per gram of non-volatile resin). The acid number is preferably between 0 and 10 (mg KOH per
Braun David W.
Dantiki Sudhakar
Mormile Patrick J.
Shepler Stewart
BASF Corporation
Niland Patrick D.
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