Patent US4053448A successfully refreshed from Google Patents.
US4053448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester based patching composition
Assignee: Individual
•
Filing: 1976-06-21
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Granted: 1977-10-11
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Expires: 1996-06-21
Abstract
Abstract Patching compositions suitable for repairing imperfections in metal surfaces, and particularly dented automobile bodies, are prepared from thermosetting unsaturated polyester resins having incorporated therein a minor amount of inorganic hollow microspheres and a major amount of a filler admixture containing silica and an alkaline inorganic powder having a pH greater than 7.
Inventors
- 👤 Arthur William Holle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/28; Y; Y10; Y10S; Y10S524/00; Y10S524/919
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
A thermosetting patching composition for the filling of dents, holes and similar imperfections in metal surfaces comprised of ( 1) about 35 to about 55 percent by weight of a binder component comprised of a mixture of an unsaturated polyester resin and a vinylidene monomer solvent copolymerizable with the polyester; (2) about 35 to about 55 percent by weight of a filler component comprised of an admixture of silica and an alkaline inorganic powder having a pH greater than 7, the silica and the alkaline inorganic powder being present at a weight ratio ranging from 1:3 to 3:1 and (3) about 3 to about 10 percent by weight of inorganic hollow microspheres.
Claim 2
Dependent Claim
112 words
A thermosetting patching composition for the filling of dents, holes and similar imperfections in metal surfaces comprised of ( 1) about 35 to about 55 percent by weight of a binder component comprised of a mixture of an unsaturated polyester resin and a vinylidene monomer solvent copolymerizable with the polyester; (2) about 35 to about 55 percent by weight of a filler component comprised of an admixture of silica and an alkaline inorganic powder having a pH greater than 7, the silica and the alkaline inorganic powder being present at a weight ratio ranging from 1:3 to 3:1 and (3) about 3 to about 10 percent by weight of inorganic hollow microspheres.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein the unsaturated polyester resin is the reaction product of maleic anhydride, phthalic anhydride and diethylene glycol.
Claim 4
Dependent Claim
34 words
The composition of claim 1 wherein the vinylidene monomer is present in the composition in an amount ranging from about 10 to about 60 percent by weight based on the weight of the polyester.
Claim 5
Dependent Claim
11 words
The composition of claim 3 wherein the vinylidene monomer is styrene.
Claim 6
Dependent Claim
25 words
The composition of claim 1 wherein the filler admixture contains silica and the alkaline inorganic powder at a weight ratio ranging from 1:2 to 2:1.
Claim 7
Dependent Claim
11 words
The composition of claim 5 wherein the silica is amorphous silica.
Claim 8
Dependent Claim
13 words
The composition of claim 5 wherein the alkaline inorganic powder is magnesium silicate.
Claim 9
Dependent Claim
14 words
The composition of claim 5 wherein the alkaline inorganic powder is CaCO 3 .
Claim 10
Dependent Claim
20 words
The composition of claim 5 wherein the pH of the alkaline inorganic powder ranges from about 8.5 to about 10.5.
Claim 11
Dependent Claim
21 words
The composition of claim 5 wherein the particle size of the filler particles ranges from about 1 to about 40 microns.
Claim 12
Dependent Claim
13 words
The composition of claim 1 wherein the inorganic hollow microspheres are glass microspheres.
Claim 13
Dependent Claim
27 words
The composition of claim 11 wherein the microspheres have diameters in the range of 30 to 100 microns and densities in the range of 0.14 to 0.38.
Claim 14
Dependent Claim
23 words
The composition of claim 1 wherein about 0.5 to about 5.0 percent by weight of a cross-linking catalyst is incorporated in the composition.
Claim 15
Dependent Claim
12 words
The composition of claim 13 wherein the cross-linking catalyst is benzoyl peroxide.
References Cited (Backward Citations)
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US3763084A
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US3798174A
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US3844995A
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US4009145A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |