US4303755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety fuel tank containing reticulated polyurethane foam mixture of poly(oxypropylene-(oxyethylene)polyetherpolyols
Assignee: Bridgestone Corp
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Filing: 1979-11-16
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Granted: 1981-12-01
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Expires: 1999-11-16
Abstract
Abstract A safety fuel tank for automobiles and the vehicles, wherein substantially skeletal reticulated flexible polyurethane foam is integrally foamed, is produced by reacting a mixture of (a) poly(oxypropylene-oxyethylene)polyetherpolyol having 51-98% by weight of ethylene oxide component and (b) poly(oxypropylene-oxyethylene)polyetherpolyol having not less than 51% by weight of propylene oxide component as the polyhydroxyl compound with an organic polyisocyanate in the presence of a catalyst, a foaming agent, a surfactant and an additive in a fuel tank.
Inventors
- 👤 Toshio Yukuta
- 👤 Kazuo Yagura
- 👤 Nobuhisa Fuchigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; B; B60; B60K; B60K15/00; B60K15/03; B60K15/03177; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/281; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3829; C08G18/40; C08G18/48; C08G18/4804; C08G18/4833; C08G18/4837; C08G18/65; C08G18/66; C08G18/6666; C08G18/6692; C08J9/0023; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; C08G2390/00; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A safety fuel tank wherein substantially skeletal reticulated flexible polyurethane foam is integrally foamed, which is obtained by reacting a mixture of (a) poly(oxypropylene-oxyethylene)polyetherpolyol having 51-98% by weight of ethylene oxide component and (b) poly(oxypropylene-oxyethylene)polyetherpolyol having not less than 51% by weight of propylene oxide component as the polyhydroxyl compound with an organic polyisocyanate in the presence of a catalyst, a foaming agent, a surfactant and an additive in a fuel tank.
Claim 2
Dependent Claim
72 words
A safety fuel tank wherein substantially skeletal reticulated flexible polyurethane foam is integrally foamed, which is obtained by reacting a mixture of (a) poly(oxypropylene-oxyethylene)polyetherpolyol having 51-98% by weight of ethylene oxide component and (b) poly(oxypropylene-oxyethylene)polyetherpolyol having not less than 51% by weight of propylene oxide component as the polyhydroxyl compound with an organic polyisocyanate in the presence of a catalyst, a foaming agent, a surfactant and an additive in a fuel tank.
Claim 3
Independent Claim
92 words
A method for producing a safety fuel tank, the entire space of which is filled with substantially skeletal reticulated flexible polyurethane foam, which comprises feeding a given amount of a compounding liquid for a flexible polyurethane foam consisting of polyhydroxyl compounds consisting of a mixture of (a) poly(oxypropylene-oxyethylene)polyetherpolyol having 51-98% by weight of ethylene oxide component and (b) poly(oxypropylene-oxyethylene)polyetherpolyol having not less than 51% by weight of propylene oxide component; an organic polyisocyanate; a catalyst; a foaming agent; a surfactant and an additive into a fuel tank, and foaming said compounding liquid.
Claim 4
Independent Claim
92 words
A method for producing a safety fuel tank, the entire space of which is filled with substantially skeletal reticulated flexible polyurethane foam, which comprises feeding a given amount of a compounding liquid for a flexible polyurethane foam consisting of polyhydroxyl compounds consisting of a mixture of (a) poly(oxypropylene-oxyethylene)polyetherpolyol having 51-98% by weight of ethylene oxide component and (b) poly(oxypropylene-oxyethylene)polyetherpolyol having not less than 51% by weight of propylene oxide component; an organic polyisocyanate; a catalyst; a foaming agent; a surfactant and an additive into a fuel tank, and foaming said compounding liquid.
Claim 5
Dependent Claim
26 words
A safety fuel tank as claimed in claim 1, wherein the mixture ratio by weight of said poly(oxypropylene-oxyethylene)polyetherpolyol (a) to said poly(oxypropylene-oxyethylene)polyether polyol (b) is 1:9-9:1.
Claim 6
Dependent Claim
27 words
A safety fuel tank as claimed in claim 1, wherein an average hydroxyl number of the mixture of the poly(oxypropylene-oxyethylene)polyetherpolyol (a) and the poly(oxypropylene-oxyethylene)polyetherpolyol (b) is 30-70.
Claim 7
Dependent Claim
44 words
A safety fuel tank as claimed in claim 1, wherein as the additive, at least one of organic carboxylic acids or the acid anhydrides thereof is used in a rate of 0.1-10 parts by weight per 100 parts by weight of the polyhydroxyl compound.
Claim 8
Dependent Claim
33 words
A safety fuel tank as claimed in claim 1, wherein as the additive, urea is used in a rate of 0.05-5 parts by weight per 100 parts by weight of the polyhydroxyl compound.
Claim 9
Dependent Claim
53 words
A safety fuel tank as claimed in claim 5, wherein said organic carboxylic acids or the acid anhydrides thereof are selected from the group consisting of acetic acid, propionic acid, butyric acid, caprylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, benzoic acid, phthalic acid and the acid anhydrides thereof.
Claim 10
Dependent Claim
25 words
A safety fuel tank as claimed in claim 1, wherein the catalyst is selected from the group consisting of organic tin compounds and amine compounds.
Claim 11
Dependent Claim
26 words
A safety fuel tank as claimed in claim 8, wherein the organic tin compounds are stannous octoate, stannous oleate, dibutyltin dilaurate, dibutyltin di-2-ethylhexanoate or dibutyltin diacetate.
Claim 12
Dependent Claim
34 words
A safety fuel tank as claimed in claim 9, wherein dibutyltin dilaurate is used in an amount of not more than 0.1 part by weight per 100 parts by weight of the polyhydroxyl compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |