Patent US5021534A successfully refreshed from Google Patents.
US5021534A
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US
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Thermosetting urethane elastomer
Assignee: Nippon Polyurethane Industry Co Ltd
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Filing: 1990-06-27
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Granted: 1991-06-04
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Expires: 2010-06-27
Abstract
Abstract A thermosetting urethane elastomer is prepared from: (a) a prepolymer having isocyanate groups at terminal ends obtained by allowing p-phenylene diisocyanate to react with a compound having 2 or more active hydrogens, and (b) curing agents of 1,4-bis(2-hydroxyethoxy)benzene and trimethylolpropane or 1,4-bis(2-hydroxyethoxy)benzene and a polyol having isocyanurate ring.
Inventors
- 👤 Masahiro Kawasaki
- 👤 Yukio Ohbuchi
- 👤 Yoshiaki Maeda
- 👤 Susumu Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/08; C08G18/0895; C08G18/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
64 words
A thermosetting urethane elastomer having improved heat resistance and compression set properties prepared from: (a) a prepolymer having isocyanate groups at terminal ends obtained by allowing p-phenylene diisocyanate to react with a compound having 2 or more active hydrogens, and (b) a curing agent selected from the group consisting of i. 1,4-bis(2-hydroxyethoxy)benzene and trimethylolpropane, and ii. 1,4-bis(2-hydroxyethoxy)benzene and a polyol having an isocyanurate ring.
Claim 2
Dependent Claim
64 words
A thermosetting urethane elastomer having improved heat resistance and compression set properties prepared from: (a) a prepolymer having isocyanate groups at terminal ends obtained by allowing p-phenylene diisocyanate to react with a compound having 2 or more active hydrogens, and (b) a curing agent selected from the group consisting of i. 1,4-bis(2-hydroxyethoxy)benzene and trimethylolpropane, and ii. 1,4-bis(2-hydroxyethoxy)benzene and a polyol having an isocyanurate ring.
Claim 3
Dependent Claim
26 words
A thermosetting urethane elastomer according to claim 1, wherein the polyol having isocyanurate ring is represented by the formula (1): ##STR2## where l, m, n=0-1, 0≦l+m+n≦3.
Claim 4
Dependent Claim
23 words
A thermosetting urethane elastomer according to claim 1, wherein the content of isocyanate groups in the prepolymer is 2 to 20% by weight.
Claim 5
Dependent Claim
23 words
A thermosetting urethane elastomer according to claim 1, wherein the content of isocyanate groups in the prepolymer is 3 to 10% by weight.
Claim 6
Dependent Claim
24 words
A thermosetting urethane elastomer according to claim 1, wherein the NCO equivalent in the prepolymer:OH equivalent in the curing agents is 1:0.8 to 1:0.95.
Claim 7
Dependent Claim
20 words
A thermosetting urethane elastomer according to claim 1, wherein the mole ratio of 1,4-bis(2-hydroxyethoxy)benzene to trimethylolpropane is 9.5:0.5 to 1:9.
Claim 8
Dependent Claim
24 words
A thermosetting urethane elastomer according to claim 1, wherein the mole ratio of 1,4-bis(2-hydroxyethoxy)benzene to the polyol containing isocyanurate ring is 9.5:0.5 to 1:9.
Claim 9
Dependent Claim
27 words
A thermosetting urethane elastomer according to claim 1 wherein the compound having 2 or more active hydrogens has an average molecular weight of between 62 and 6000.
Claim 10
Dependent Claim
27 words
A thermosetting urethane elastomer according to claim 1 wherein the compound having 2 or more active hydrogens has an average molecular weight of between 1000 and 3000.
Claim 11
Dependent Claim
39 words
A thermosetting urethane elastomer according to claim 8 wherein the compound having 2 or more active hydrogens is selected from the group consisting of a polyester polyol, a polyether polyol, a polycarbonate polyol, a polyacrylic polyol and a polyamine.
Claim 12
Dependent Claim
21 words
A thermosetting urethane elastomer according to claim 10 wherein the compound having 2 or more active hydrogens is a polyester polyol.
Claim 13
Dependent Claim
23 words
A thermosetting urethane elastomer according to claim 11 wherein the polyester polyol is obtained by polycondensation of a glycol with a dibasic acid.
Claim 14
Dependent Claim
87 words
A thermosetting urethane elastomer according to claim 12 wherein the glycol is selected from the group consisting of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,2-dimethyl-1,3 propane diol, diethylene glycol, 1,5-pentene diol, 3-methyl-1,5-pentane diol, 1,6-hexane diol, cyclohexane-1,4-diol, cyclohexane-1,4-dimethanol and the dibasic acid is selected from the group consisting of succinic acid, maleic acid, adipic acid, glutaric acid, pimellic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, hexahydrophthalic acid, hexahydroisophthalic acid, esters of the acids and halides of the acids.
Claim 15
Dependent Claim
40 words
A thermosetting urethane elastomer according to claim 10 wherein the polycarbonate polyol is obtained by reacting a carbonate which is selected from the group consisting of a dialkyl carbonate, a diaryl carbonate, and an alkylene carbonate with a hydroxyl compound.
Claim 16
Dependent Claim
24 words
A thermosetting urethane elastomer according to claim 14 wherein the hydroxyl compound is selected from the group consisting of 1,4-butylene glycol and 1,6-hexane diol.
Claim 17
Dependent Claim
17 words
A thermosetting urethane elastomer according to claim 10 wherein the polyester polyol is a lactone type polyol.
Claim 18
Dependent Claim
21 words
A thermosetting urethane elastomer according to claim 10 wherein the compound having 2 or more active hydrogens is a polyether polyol.
Claim 19
Dependent Claim
16 words
A thermosetting urethane elastomer according to claim 17 wherein the polyether polyol is a polytetramethylene glycol.
References Cited (Backward Citations)
US3016364A
Cited
US3658746A
Cited
US3716519A
Cited
JPS4925427A
Cited
US4086211A
Cited
JPS6059249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |