|
Inventors: Nixon; Charles R.
Appl. No.: 311150
Filed: February 14, 1989
| Current
U.S. Class: |
524/188; 524/265;
524/546
|
| Intern'l
Class: |
C08K 005/54; C08L
027/18
|
| Field
of Search: |
524/546,261,262,506,188,265
427/13,387
|
References Cited
[Referenced By]
U.S. Patent
Documents
| 3560249 |
Feb., 1971 |
Chereshkevich
et al. |
427/13.
|
| 3925292 |
Dec., 1975 |
Holmes |
524/546.
|
| 3968069 |
Jul., 1976 |
Grimand et
al. |
524/546.
|
| 4104225 |
Aug., 1978 |
Combere |
524/546.
|
| 4284668 |
Aug., 1981 |
Nixon |
427/355.
|
Other
References
Dow Corning,
"A Guide to Dow Corning.RTM. Silicones for Polish
Formulators", Form No. 22-637A-79, 1979.
Dow Corning, "Information About Polish
Ingredients", Form No. 22-240A-78, 1978.
Dow Corning, Material Safety Data Sheet for "Dow
Corning.RTM. 531 Fluid", May 15, 1987.
Dow Corning, Material Safety Data Sheet for "Dow
Corning.RTM. 536 Fluid", Mar. 26, 1990.
Primary
Examiner: Lawrence; Evan
Attorney, Agent or Firm: Volpe & Koenig
Description
BACKGROUND OF
THE INVENTION
This invention
relates to sealants for metal or painted surfaces, including
the gel coat on fiberglass, to protect the surfaces from
corrosion and other damaging environmental effects. The
present invention is particularly useful as a paint sealant
for automobiles, airplanes or boats.
Unprotected
painted surfaces and unpainted metal surfaces are damaged by
exposure to the environment by the action of ultra-violet
and infra-red rays of the sun, acid rain, salt, insects and
other harmful elements. There have been numerous products
developed for protecting painted surfaces, such as waxes,
activated silicone polyethylene polymers and, as described
in U.S. Pat. No. 4,284,668, tetrafluoroethylene polymers.
SUMMARY OF THE
INVENTION
The present
invention is directed towards novel protective compositions
and a method of applying same to a painted surface,
including gel coats of fiberglass surfaces, or unpainted
metal surface. The protective composition comprises
negatively charged polytetrafluoroethylene (hereinafter
"PTFE") polymer resin particles, preferably in an
aqueous dispersion in the form of a hydrophobic colloid with
resin particles of about 0.05 to about 0.5 microns or larger
in size.
Before
application of the protective composition, the painted or
metal surface is positively charged, preferably with a novel
cleaning composition which removes any trapped sediments and
insolvents from the pores in the paint or metal surface and
which leaves the surface positively charged by virtue of
using a cationic surfactant containing electropositive ions.
The molecules of
PTFE resin, which are negatively charged, i.e. containing
negative ions, are pulled down into the pores in the surface
of the paint or metal in view of the electrostatic
attraction between the negatively charged molecules and the
positively charged surface. As the treated surface is
allowed to cure in a warm environment, the PTFE resin
molecules elongate, causing them to physically interlock
themselves to each other and fuse into the paint or metal
surface.
The PTFE is
inert to most harmful elements except halogen fluorene. In
particular the action of ultra-violet and infra-red rays,
photolysis, acidic and alkaline chemicals are resisted by
the PTFE protective coating. The present invention therefore
provides durability and resistance to the damaging effect of
environmental elements, in combination with a very simple
method of application.
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