US3963681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane elastomers prepared from polyethers having a certain molecular weight distribution
Assignee: Bridgestone Corp
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Filing: 1974-06-27
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Granted: 1976-06-15
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Expires: 1994-06-27
Abstract
Abstract Polyether urethane elastomer composition having improved mechanical properties has been prepared by using polyfunctional isocyanate, curing agent and polyether having active hydrogen terminal groups, wherein the weight average molecular weight of said polyether is within the range of 1,000 to less than 4,500 and the molecular weight distribution curve of said polyether has at least two peaks, at least one of which is located in the higher molecular weight region and at least another one of which is located in the lower molecular weight region than the rheological critical molecular weight of said polyether and wherein the equivalent ratio (d) of active hydrogen of a curing agent to the isocyanate group of said polyfunctional isocyanate is in the range of 0.9<d<1.2.
Inventors
- 👤 Yoshio Kaneko
- 👤 Yoji Watabe
- 👤 Tsutomu Matsunaga
- 👤 Shigeyuki Toki
- 👤 Yutaka Iseda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/08; C08G18/10; C08G18/12; C08G18/4808
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
Polyether urethane elastomer composition having improved mechanical properties prepared by using polyfunctional isocyanate, curing agent and polyether having active hydrogen terminal groups which can react with the isocyanate group, wherein weight average molecular weight of said polyether is within the range of 1,000 to less than 4,500 and the molecular weight distribution curve of said polyether has at least two peaks, at least one of which is located in the higher molecular weight region and at least another one of which is located in the lower molecular weight region than the critical molecular weight of said polyether and wherein the equivalent ratio (d) of active hydrogen of a curing agent to the isocyanate group of said polyfunctional isocyanate is in the range of 0.9<d<1.2.
Claim 2
Dependent Claim
124 words
Polyether urethane elastomer composition having improved mechanical properties prepared by using polyfunctional isocyanate, curing agent and polyether having active hydrogen terminal groups which can react with the isocyanate group, wherein weight average molecular weight of said polyether is within the range of 1,000 to less than 4,500 and the molecular weight distribution curve of said polyether has at least two peaks, at least one of which is located in the higher molecular weight region and at least another one of which is located in the lower molecular weight region than the critical molecular weight of said polyether and wherein the equivalent ratio (d) of active hydrogen of a curing agent to the isocyanate group of said polyfunctional isocyanate is in the range of 0.9<d<1.2.
Claim 3
Dependent Claim
63 words
Polyether urethane elastomer composition as claimed in claim 1, wherein the polyether component is prepared by mixing at least one polyether having the peak of its molecular weight distribution curve below the critical molecular weight of said polyether component and at least one other polyether having the peak of its molecular weight distribution curve above the critical molecular weight of said polyether component.
Claim 4
Dependent Claim
38 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said active hydrogen terminal group is at least one selected from the group consisting of terminal hydroxyl group, terminal amino group, terminal carboxyl group and terminal thiol group.
Claim 5
Dependent Claim
50 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said polyether is at least one selected from the group consisting of polyalkylene dicarboxylic acid, polyalkylene dithiol, polyalkylene diamine, their mixtures, and pre-extended polymers produced by subjecting such polyethers to reaction with a diisocyanate or diisocyanate prepolymer of such polyethers.
Claim 6
Dependent Claim
15 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said polyether is polyalkylene glycol.
Claim 7
Dependent Claim
21 words
Polyether urethane elastomer composition as claimed in claim 4, wherein said pre-extended polymer is prepared by reacting polyalkylene glycol with diisocyanate.
Claim 8
Dependent Claim
29 words
Polyether urethane elastomer composition as claimed in claim 5, wherein said polyalkylene glycol is selected from the group consisting of polyethylene glycol, polypropylene glycol, polytetramethylene glycol and their mixtures.
Claim 9
Dependent Claim
16 words
Polyether urethane elastomer composition as claimed in claim 5, wherein said polyalkylene glycol is polytetramethylene glycol.
Claim 10
Dependent Claim
29 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said polyfunctional isocyanate is at least one selected from the group consisting of aromatic diisocyanate, aliphatic diisocyanate and triisocyanate.
Claim 11
Dependent Claim
43 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said polyfunctional isocyanate is at least one selected from the group consisting of tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, naphthalene-1,5-diisocyanate, diphenyl-4,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, 1,6-hexamethylene diisocyanate, 1,3-, and 1,4-cyclohexyl diisocyanate, methylene-bis(4-cyclohexyl diisocyanate), 1,3- and 1,4-xylylene diisocyanate, and their mixtures.
Claim 12
Dependent Claim
26 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said curing agent is at least one selected from the group consisting of polyamine and polyol.
Claim 13
Dependent Claim
48 words
Polyether urethane elastomer composition as claimed in claim 1, wherein said curing agent is at least one selected from the group consisting of methylene bis(ortho-chloroaniline), naphthalene-1,5-diamine, ortho-, meta- and para-phenylenediamine, tolylene-2,4-diamine, dichlorobenzidine, diphenylether-4,4'-diamine, hydrazine, ethylenediamine, hexamethylene-1,6-diamine, piperazine, ethylene glycol, 1,3-propylene glycol, 1,3- and 1,4-butanediol, trimethylolpropane and their mixtures.
Claim 14
Dependent Claim
69 words
Process for preparation of the polyether urethane elastomer composition as claimed in claim 2, wherein after mixing the polyethers the mixture so obtained is subjected to reaction with polyfunctional isocyanate selected from the group consisting of aromatic diisocyanate and aliphatic diisocyanate and triisocyanate and then the mixture of polyethers and polyfunctional isocyanate is cured with at least one curing agent selected from the group consisting of polyamine and polyol.
Claim 15
Dependent Claim
58 words
Process for preparation of the polyether urethane elastomer composition as claimed in claim 2, wherein, after mixing the polyethers the polyether mixture is subjected to reaction with polyfunctional isocyanate selected from the group consisting of aromatic diisocyanate and aliphatic diisocyanate and triisocyanate and curing agent selected from the group consisting of polyamine and polyol at the same time.
References Cited (Backward Citations)
US3798200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |