US4390570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid roof system
Assignee: ELASTIC MATERIALS Inc
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Filing: 1981-12-21
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Granted: 1983-06-28
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Expires: 2001-12-21
Abstract
Abstract A fluid roof coating which is applied to a building. The coating is an aqueous air-drying composition preferably comprising, as a suspension: (a) a first polymer emulsion having a low enough Tg that it will not crystallize at subfreezing temperatures; (b) a second polymer emulsion which is harder than said first polymer emulsion, dries to a higher gloss finish than said first emulsion polymer, and has a Tg such that the resulting mixture will maintain a low enough Tg that it will not crystallize at subfreezing temperatures; and (c) non-polymeric solids including a pigment; wherein the composition contains at least 25% polymeric solids, no more than 35% non-polymeric solids, and a total solid content of 50% of percentage based on the weight of the composition. The composition when air-dried has a Shore hardness of at least 20, a tensile strength of at least 100 psi, and an elongation of at least 100% when measured at room temperature.
Inventors
- 👤 Irene L. Rehberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:07
CPC Classifications
E; E04; E04D; E04D7/00; D; D06; D06N; D06N3/00; D06N3/04; D06N3/042; E04D13/00; E04D13/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
258 words
A method of providing a roof coating to a structure, comprising the steps of providing an aqueous fluid suspension stable at high ambient temperatures comprising (A) a polymeric emulsion composed of an unreacted mixture of (i) a first self-plasticizing acrylic emulsion polymer having a first Tg low enough that it will not become brittle at subfreezing temperatures, and (ii) a second acrylic emulsion polymer which will dry in air to a harder, higher gloss finish than the first acrylic emulsion polymer and which has a different, second Tg such that the Tg of the resulting coating is low enough that it will not become brittle in subfreezing temperatures, and (B) non-polymeric solids, said polymeric emulsion providing polymeric solids constituting at least about 25% of the total weight of said suspension, said non-polymeric solids comprising no more than about 35% of the total weight of said suspension and said polymeric and non-polymeric solids together forming at least about 50% of the total weight of the fluid suspension, applying the fluid suspension onto a roof substrate in a thickness such that it will dry in the presence of air to a thickness of at least about 20 mils, and allowing the fluid suspension to dry in the presence of air to form an elastic coating on the roof substrate, said elastic coating having at least about a 20 Shore hardness, an elongation of at least about 100%, a tensile strength of at least about 100 psi, and a Tg such that the coating will not become brittle in subfreezing temperatures.
Claim 2
Independent Claim
258 words
A method of providing a roof coating to a structure, comprising the steps of providing an aqueous fluid suspension stable at high ambient temperatures comprising (A) a polymeric emulsion composed of an unreacted mixture of (i) a first self-plasticizing acrylic emulsion polymer having a first Tg low enough that it will not become brittle at subfreezing temperatures, and (ii) a second acrylic emulsion polymer which will dry in air to a harder, higher gloss finish than the first acrylic emulsion polymer and which has a different, second Tg such that the Tg of the resulting coating is low enough that it will not become brittle in subfreezing temperatures, and (B) non-polymeric solids, said polymeric emulsion providing polymeric solids constituting at least about 25% of the total weight of said suspension, said non-polymeric solids comprising no more than about 35% of the total weight of said suspension and said polymeric and non-polymeric solids together forming at least about 50% of the total weight of the fluid suspension, applying the fluid suspension onto a roof substrate in a thickness such that it will dry in the presence of air to a thickness of at least about 20 mils, and allowing the fluid suspension to dry in the presence of air to form an elastic coating on the roof substrate, said elastic coating having at least about a 20 Shore hardness, an elongation of at least about 100%, a tensile strength of at least about 100 psi, and a Tg such that the coating will not become brittle in subfreezing temperatures.
Claim 3
Dependent Claim
22 words
A method as set forth in claim 1 wherein said first emulsion polymer has a Tg of about -45° C. or less.
Claim 4
Dependent Claim
53 words
A method as set forth in claim 2 wherein said fluid suspension additionally contains an effective amount of at least one component selected from the group consisting of an anti-freeze ingredient, a pigment dispersant, a defoamer, a viscosity modified, an anti-yellowing agent, an extender, a microbicide, a pH control agent and mixtures thereof.
References Cited (Backward Citations)
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US3785860A
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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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |