US4525501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection against soiling
Assignee: National Foam System Inc
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Filing: 1981-10-05
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Granted: 1985-06-25
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Expires: 2001-10-05
Abstract
Abstract Water-resistant articles such as automobile surfaces are protected against soiling from asphalt undercoating, paint overspray and the like, by applying a pre-coat film of polymer that is readily flushed off with water after the soiling exposure is terminated. Pre-coat is preferably applied from aqueous dispersion and has sufficient levelling agent content to keep it from separating into droplets when applied on a heavily waxed surface. Fluorinated surfactants, by themselves or mixed with silicone surfactants, are effective levelling agents. Alginate and half-acid half-amide 3-dimethylaminopropylamine-reacted ethylene-maleic anhydride polymers are very good film-formers, although others can be used. The film-formers are preferably heavily plasticized with glycerine or other water-soluble plasticizer.
Inventors
- 👤 Edward C. Norman
- 👤 Howard A. Dowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:22
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/008; B; B08; B08B; B08B17/00; B08B17/02; C09D123/00; C09D123/02; C09D123/04; C09D123/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A protective composition that deposits a solid protective coating film which can be flushed off with water, said composition being an aqueous dispersion of a water-dispersed film former containing about 1/4% to about 10% of the film former by weight, a hydrophilic plasticizer for the film former, the amount of such plasticizer being more than twice that of the film former by weight, the composition containing a levelling agent for the plasticized film former, the agent being in an amount that causes the composition to essentially uniformly wet a water-repellent surface, the composition being removable by flushing with a water jet after drying and then standing in the hot sun for several days, and the composition also containing not over 2% total surfactant.
Claim 2
Dependent Claim
123 words
A protective composition that deposits a solid protective coating film which can be flushed off with water, said composition being an aqueous dispersion of a water-dispersed film former containing about 1/4% to about 10% of the film former by weight, a hydrophilic plasticizer for the film former, the amount of such plasticizer being more than twice that of the film former by weight, the composition containing a levelling agent for the plasticized film former, the agent being in an amount that causes the composition to essentially uniformly wet a water-repellent surface, the composition being removable by flushing with a water jet after drying and then standing in the hot sun for several days, and the composition also containing not over 2% total surfactant.
Claim 3
Dependent Claim
23 words
The composition of claim 1 in which the amount of plasticizer is at least 7 times that of the film former by weight.
Claim 4
Dependent Claim
12 words
The composition of claim 1 in which the plasticizer is essentially glycerine.
Claim 5
Dependent Claim
31 words
The composition of claim 1 in which the film former is essentially an ethylene-maleic anhydride polymer that has been converted to a water-soluble half-acid half-amide, by reaction with N,N-dimethyl trimethylene diamine.
Claim 6
Dependent Claim
14 words
The composition of claim 1 in which the film former is essentially an alginate.
Claim 7
Dependent Claim
77 words
In an aqueous surfactant-containing dispersion of a film-former for application to a surface to form a temporary protective film that can be subsequently flushed off with water, the improvement according to which the dispersion contains not over 1% total surfactant, but contains at least 0.02% fluorinated surfactant leveling agent to cause the dispersion to form a relatively level coating film over essentially all of a heavily waxed or shined hydrophobic surface to which the dispersion is applied.
Claim 8
Dependent Claim
77 words
In an aqueous surfactant-containing dispersion of a film-former for application to a surface to form a temporary protective film that can be subsequently flushed off with water, the improvement according to which the dispersion contains not over 1% total surfactant, but contains at least 0.02% fluorinated surfactant leveling agent to cause the dispersion to form a relatively level coating film over essentially all of a heavily waxed or shined hydrophobic surface to which the dispersion is applied.
Claim 9
Dependent Claim
23 words
The combination of claim 6 in which the aqueous dispersion also contains silicone surfactant leveling agent that improves the leveling of the coating.
Claim 10
Dependent Claim
76 words
In an aqueous surfactant-containing dispersion of film-former for application to a surface to form a temporary protective film that can be subsequently flushed off with water, the improvement according to which at least about two-thirds of the film-former is water-soluble alginate, the dispersion contains not over 1% total surfactant and also contains a hydrophilic plasticizer for the film produced by the film-former, the amount of plasticizer being more than three times the weight of the film-former.
Claim 11
Dependent Claim
76 words
In an aqueous surfactant-containing dispersion of film-former for application to a surface to form a temporary protective film that can be subsequently flushed off with water, the improvement according to which at least about two-thirds of the film-former is water-soluble alginate, the dispersion contains not over 1% total surfactant and also contains a hydrophilic plasticizer for the film produced by the film-former, the amount of plasticizer being more than three times the weight of the film-former.
Claim 12
Dependent Claim
24 words
The combination of claim 8 in which the plasticizer is glycerine and is in a concentration at least seven times that of the film-former.
References Cited (Backward Citations)
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US4055441A
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Cited
US4089804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |