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
2000-05-19
2003-03-11
Cain, Edward J. (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...
Reexamination Certificate
active
06531541
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to coating compositions suitable for sound and vibration dampening.
BACKGROUND OF THE INVENTION
Typically, precut asphalt- or rubber-based patches are used for lining floor pans, deck lids and doors of automobiles to dampen or reduce road and engine noise and vibrations, preventing them from permeating into the passenger compartment of the motor vehicle. Sprayable coatings which are capable of being applied by robotics are desirable to provide labor and cost savings, reduced part inventories and flexibility in design specifications for damping properties. Waterborne or high solids coatings are desirable in trim shop applications where only air dry cure is feasible. It is important that these coatings dry quickly, in about 2 to 3 hours after application, so that the coating does not transfer to other parts of the automobile during assembly operations.
Generally, any coating that contains a volatile component such as water must undergo a decrease in volume as the volatile component evaporates from the surface of the coating. As the volatile component leaves the coating, contraction forces act to pull the coating inward in all directions. However, without intending to be bound by any theory, it is believed that if the coating has sufficient cohesive strength, the coating will contract in only one dimension, that is, the coating thickness will decrease while the coating resists contraction in any direction parallel to the substrate surface. By contrast, if a coating lacks cohesive strength sufficient to resist contraction parallel to the substrate surface, contraction forces will cause the coating to break up into small flat segments that are separated by continuous linear voids. This surface defect is commonly referred to as “mudcracking”.
The automotive industry would derive a significant economic benefit from a coating composition which can be spray applied to form a coating which dries quickly, is essentially free of mudcracking and which provides sound and vibration dampening.
SUMMARY OF THE INVENTION
A coating composition according to the present invention is provided which comprises: (a) an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) a nitrile functional material; and (ii) a polyoxyalkylene acrylate; and (b) a filler material.
Another aspect of the present invention is a coating composition comprising: (a) an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) an amide functional material; and (ii) a polyoxyalkylene acrylate; and (b) a filler material.
Another aspect of the present invention is a coating composition comprising: (a) an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) a carbamate functional material; and (ii) a polyoxyalkylene acrylate; and (b) a filler material.
Another aspect of the present invention is a coating composition comprising: (a) an aqueous dispersion of polymeric microparticles having a glass transition temperature greater than 5° C. and being prepared from components comprising: (i) a nitrile functional material; and (ii) a hydroxy functional material; and (b) a filler material.
Another aspect of the present invention is a coating composition comprising: (a) a first aqueous dispersion of polymeric microparticles having a glass transition temperature greater than 5° C. and being prepared from a first nitrile functional material; (b) a second aqueous dispersion of polymeric microparticles having a glass transition temperature greater than 5° C. and being prepared from a second nitrile functional material, the polymeric microparticles of the first aqueous dispersion being different from the polymeric microparticles of the second aqueous dispersion; and (c) a filler material.
Yet another aspect of the present invention is a coating composition comprising: (a) a first aqueous dispersion of polymeric microparticles having a glass transition temperature greater than 5° C. and being prepared from a nitrile functional material; (b) a second aqueous dispersion of polymeric microparticles having a glass transition temperature greater than 5° C. and being prepared from a hydroxy functional material; and (c) a filler material.
Another aspect of the present invention is a coating composition comprising: (a) an aqueous dispersion of polymeric acrylic microparticles having a glass transition temperature greater than +10° C. and being prepared from components comprising: (i) a hydroxy functional material; (ii) an acid functional material; and (iii) an acrylate monomer; and (b) a filler material.
Still another aspect of the present invention is a coated substrate having a coating deposited upon a surface of the substrate comprising: (a) an at least partially dried residue of an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) a nitrile functional material; and (ii) a polyoxyalkylene acrylate; and (b) a filler material.
Yet another aspect of the present invention is a coated substrate having a coating deposited upon a surface of the substrate comprising: (a) an at least partially dried residue of an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) an amide functional material; and (ii) a polyoxyalkylene acrylate; and (b) a filler material.
Another aspect of the present invention is a coated substrate having a coating deposited upon a surface of the substrate comprising: (a) an at least partially dried residue of: (i) a first aqueous dispersion of polymeric microparticles prepared from a first nitrile functional material; and (ii) a second aqueous dispersion of polymeric microparticles prepared from a second nitrile functional material, the polymeric microparticles of the first aqueous dispersion being different from the polymeric microparticles of the second aqueous dispersion; and (b) a filler material.
Yet another aspect of the present invention is a coated substrate having a coating deposited upon a surface of the substrate comprising: (a) an at least partially dried residue of an aqueous dispersion of polymeric microparticles prepared from components comprising: (i) a nitrile functional material; and (ii) a hydroxy functional material; and (b) a filler material.
Another aspect of the present invention is a method for inhibiting sound transmission through a substrate, comprising: (a) applying to the substrate a coating composition comprising: (i) an aqueous dispersion of polymeric microparticles prepared from components comprising a nitrile functional material and a polyoxyalkylene acrylate; and (ii) a filler material; and (b) at least partially drying the coating composition to provide a coating upon the substrate for inhibiting sound transmission therethrough.
Yet another aspect of the present invention is a method for inhibiting sound transmission through a substrate, comprising: (a) applying to the substrate a coating composition comprising: (i) a first aqueous dispersion of polymeric microparticles prepared from a first nitrile functional material; (ii) a second aqueous dispersion of polymeric microparticles prepared from a second nitrile functional material, the polymeric microparticles of the first aqueous dispersion being different from the polymeric microparticles of the second aqueous dispersion; and (iii) a filler material; and (b) at least partially drying the coating composition to provide a coating upon the substrate for inhibiting sound transmission therethrough.
As used herein, unless otherwise expressly specified, all of the numerical ranges, amounts, values and percentages such as those for amounts of materials, times and temperatures of reaction, ratios of amounts, values for molecular weight (whether number average molecular weight (“M
n
”) to or weight average molecular weight (“M
w
”)), and others in the following portion of the specification may be read as if prefaced by the word “about” even though the term “about” may not expressly appear with the value, amount or range. Also, as used
Desai Umesh C.
Kania Charles M.
Palermo Anthony C.
Ragunathan Kaliappa G.
Swarup Shanti
Altman Deborah M.
Cain Edward J.
Miles Jacques B.
PPG Industries Ohio Inc.
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