Patent US5496496A successfully refreshed from Google Patents.
US5496496A
Expired / Lapsed
US
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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 21:34
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.
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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) | 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 |