US4666949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermochromic polyurethane foam
Assignee: Bridgestone Corp
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Filing: 1986-01-31
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Granted: 1987-05-19
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Expires: 2006-01-31
Abstract
Abstract A thermochromatic polyurethane foam comprising a polyol and a polyisocyanate as main components, and a thermochromic composition serving as a coloring agent and added to the main components singly or conjointly with a usual dye or pigment. The thermochromic composition comprises an electron-donating chromogenic material, an acidic substance and a solvent.
Inventors
- 👤 Goro Shimizu
- 👤 Yoshimi Hayashi
- 👤 Hajime Hasegawa
- 👤 Taiji Koga
- 👤 Atsuo Takei
- 👤 Tohru Okuyama
- 👤 Hideo Torigoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
A thermochromatic polyurethane foam characterized in that the foam comprises a polyol and a polyisocyanate as main components, and a thermochromic composition serving as a coloring agent and added to the main components singly or conjointly with a usual dye or pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 2
Dependent Claim
56 words
A thermochromatic polyurethane foam characterized in that the foam comprises a polyol and a polyisocyanate as main components, and a thermochromic composition serving as a coloring agent and added to the main components singly or conjointly with a usual dye or pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 3
Dependent Claim
31 words
A thermochromic polyurethane foam as defined in claim 1 wherein the electron-donating chromogenic material, the acidic substance and the solvent are conjointly enclosed in microcapsules to serve as the thermochromic composition.
Claim 4
Dependent Claim
16 words
A thermochromic polyurethane foam as defined in claim 1 wherein the acidic substance is a 1,2,3-triazole.
Claim 5
Dependent Claim
38 words
A thermochromic polyurethane foam as defined in claim 1 wherein the solvent is at least one member selected from the group consisting of alcohols, esters, azomethines and amides and having a boiling point of at least 150° C.
Claim 6
Dependent Claim
32 words
A thermochromic polyurethane foam as defined in claim 1 which comprises the thermochromic composition in an amount of 1 to 50 parts by weight per 100 parts by weight of the polyol.
Claim 7
Dependent Claim
55 words
A thermochromatic polyurethane foam comprising a polyol and a polyisocyanate as main components, and a thermochromic composition serving as a coloring agent and added to the main components at least singly, and at least one of a dye and a pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 8
Dependent Claim
55 words
A thermochromatic polyurethane foam comprising a polyol and a polyisocyanate as main components, and a thermochromic composition serving as a coloring agent and added to the main components at least singly, and at least one of a dye and a pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 9
Dependent Claim
27 words
A thermochromic polyurethane foam according to claim 6, including microcapsules enclosing the electron-donating chromogenic material, the acidic substance and the solvent to serve as the thermochromic composition.
Claim 10
Dependent Claim
15 words
A thermochromic polyurethane foam according to claim 7, wherein the acidic substance is a 1,2,3-triazole.
Claim 11
Dependent Claim
37 words
A thermochromic polyurethane foam according to claim 8, wherein the solvent is at least one member selected from the group consisting of alcohols, esters, azomethines and amides and having a boiling point of at least 150° C.
Claim 12
Dependent Claim
31 words
A thermochromic polyurethane foam according to claim 9, which comprises the thermochromic composition in an amount of 1 to 50 parts by weight per 100 parts by weight of the polyol.
Claim 13
Independent Claim
56 words
A method of making a thermochromic polyurethane foam comprising combining polyol and polyisocyanate as main components, with a thermochromic composition serving as a coloring agent and added to the main components singly or conjointly with at least one of dye and pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 14
Independent Claim
56 words
A method of making a thermochromic polyurethane foam comprising combining polyol and polyisocyanate as main components, with a thermochromic composition serving as a coloring agent and added to the main components singly or conjointly with at least one of dye and pigment, the thermochromic composition comprising an electron-donating chromogenic material, an acidic substance and a solvent.
Claim 15
Dependent Claim
11 words
A method according to claim 11, including microcapsulating the thermochromic composition.
Claim 16
Dependent Claim
21 words
A method according to claim 11, wherein the solvent is selected to have a boiling point of at least 150° C.
References Cited (Backward Citations)
US3560229A
Cited
US3539375A
Cited
US3741628A
Cited
US3705037A
Cited
US4028118A
Cited
US4086054A
Cited
GB1405701A
Cited
US4054684A
Cited
US4341565A
Cited
GB2093055A
Cited
US4425161A
Cited
US4421560A
Cited
US4502066A
Cited
US4501876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |