US5496496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyurethane elastomers
Assignee: Mitsui Chemicals Polyurethanes Inc
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Filing: 1993-02-10
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Granted: 1996-03-05
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Expires: 2013-02-10
Abstract
Abstract A method for producing a polyurethane elastomer which comprises reacting (1) either a polyisocyanate and a polyol or an isocyanate-terminated prepolymer obtainable by reacting said polyisocyanate with said polyol with (2) a diol of general formula <IMAGE> wherein A1 and A2 are the same or different and each represents a bond, -O- or -COO-; R1 and R2are the same or different and each represents C1-6 alkylene; X1 and X2 are the same or different and each represents H or hydroxyalkyl and (3) a triol having a hydroxyl equivalent of 60 to 500, gives a polyurethane elastomer with improved tensile strength, tear strength and other mechanical properties.
Inventors
- 👤 Yasuyuki Kajita
- 👤 Tsutomu Kubota
- 👤 Kenji Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6511; C08G18/6517; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3203; C08G18/3215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A polyurethane elastomer curing composition which consists of a diol of the general formula ##STR4## wherein A 1 and A 2 are the same or different and each represents a bond, --O-- or --COO--; R 1 and R 2 are the same or different and each represents C 1-6 alkylene; and X 1 and X 2 are the same or different and each represents H or hydroxylalkyl, and a triol having a hydroxyl equivalent weight of 60 to 500 and being selected from the group consisting of (a) a trifunctional polyether polyol obtained by random or block addition reaction between at least one of trimethylolpropane or glycerol and at least one alkylene oxide, (b) a trifunctional polyester polyol obtained by addition reaction between at least one of trimethylolpropane or glycerol and at least one cyclic ester and (c) a hydroxyl-containing fatty acid ester which is the product of condensation between at least one of trimethylolpropane and glycerol and at least one hydroxyl-containing fatty acid, the weight ratio of the diol and the triol being 1:0.05 to 1.5.
Claim 2
Dependent Claim
177 words
A polyurethane elastomer curing composition which consists of a diol of the general formula ##STR4## wherein A 1 and A 2 are the same or different and each represents a bond, --O-- or --COO--; R 1 and R 2 are the same or different and each represents C 1-6 alkylene; and X 1 and X 2 are the same or different and each represents H or hydroxylalkyl, and a triol having a hydroxyl equivalent weight of 60 to 500 and being selected from the group consisting of (a) a trifunctional polyether polyol obtained by random or block addition reaction between at least one of trimethylolpropane or glycerol and at least one alkylene oxide, (b) a trifunctional polyester polyol obtained by addition reaction between at least one of trimethylolpropane or glycerol and at least one cyclic ester and (c) a hydroxyl-containing fatty acid ester which is the product of condensation between at least one of trimethylolpropane and glycerol and at least one hydroxyl-containing fatty acid, the weight ratio of the diol and the triol being 1:0.05 to 1.5.
References Cited (Backward Citations)
US3839284A
Cited
US3892713A
Cited
USRE31671E
Cited
US4119594A
Cited
JPS5657817A
Cited
US4732957A
Cited
US4739027A
Cited
US4695618A
Cited
US4877856A
Cited
US5066762A
Cited
EP0316150A2
Cited
US5021534A
Cited
US4956439A
Cited
GB2220670A
Cited
US4925732A
Cited
US4868223A
Cited
EP0449331A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |