US4404353A
Expired / Lapsed
US
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Urethane elastomer for printing belts and process therefor
Assignee: Ricoh Printing Systems America Inc
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Filing: 1981-08-20
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Granted: 1983-09-13
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Expires: 2001-08-20
Abstract
Abstract A process for making an elastomer for use in printing/drive belts is disclosed wherein a mixture of approximately 2 equivalents of toluene diisocyanate consisting of about 88 wt. % of the 2,4 isomer and 12 wt. % of the 2,6 isomer is reacted with a polyether or polyester having difunctional primary hydroxyl groups to form a prepolymer. The prepolymer is then reacted with a diamine curing agent to form the elastomer.
Inventors
- 👤 Edwin C. Slagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; B; B41; B41N; B41N1/00; B41N1/16; B41N1/22; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
124 words
A process for making a urethane elastomer comprising the steps of: reacting a mixture of approximately 1.5 to 2.5 equivalents of toluene diisocyanate consisting essentially of approximately 84 wt.% to 96 wt.% 2,4 toluene diisocyanate and 16 wt.% to 4 wt.% 2,6 toluene diisocyanate, with approximately 1 equivalent of a member selected from the group consisting of polyethers having difunctional primary hydroxyl groups, saturated difunctional primary hydroxyl polyesters, and mixtures thereof, to form a urethane prepolymer, said member having a molecular weight selected such that the molecular weight of the resulting urethane prepolymer is between about 500 and 4,000; and reacting approximately 1 equivalent of said prepolymer with approximately 1 equivalent of a diamine curing agent having the formula: ##STR7## where n=2 through 6.
Claim 2
Dependent Claim
124 words
A process for making a urethane elastomer comprising the steps of: reacting a mixture of approximately 1.5 to 2.5 equivalents of toluene diisocyanate consisting essentially of approximately 84 wt.% to 96 wt.% 2,4 toluene diisocyanate and 16 wt.% to 4 wt.% 2,6 toluene diisocyanate, with approximately 1 equivalent of a member selected from the group consisting of polyethers having difunctional primary hydroxyl groups, saturated difunctional primary hydroxyl polyesters, and mixtures thereof, to form a urethane prepolymer, said member having a molecular weight selected such that the molecular weight of the resulting urethane prepolymer is between about 500 and 4,000; and reacting approximately 1 equivalent of said prepolymer with approximately 1 equivalent of a diamine curing agent having the formula: ##STR7## where n=2 through 6.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein said member is polytetramethylene ether glycol.
Claim 4
Dependent Claim
17 words
The process according to claim 1 or 2 wherein said diamine curing agent has the formula: ##STR8##
Claim 5
Dependent Claim
18 words
The process according to claim 3 wherein said toluene diisocyanate mixture comprises approximately 88 wt.% 2,4 toluene diisocyanate.
Claim 6
Dependent Claim
39 words
The process according to claim 4 wherein said toluene diisocyanate mixture is prepared by mixing 1.2 equivalents of a solution containing 80 wt.% 2,4 toluene diisocyanate and 20 wt.% 2,6 toluene diisocyanate, with 0.8 equivalents of 2,4 toluene diisocyanate.
Claim 7
Dependent Claim
18 words
The process according to claim 4 wherein said polytetramethylene ether glycol has a molecular weight of approximately 2,000.
Claim 8
Dependent Claim
35 words
The process according to claim 4 wherein said toluene diisocyanate mixture and said polytetramethylene ether glycol are reacted together for approximately 12 to 15 minutes at a temperature of approximately 184° F. to 187° F.
Claim 9
Dependent Claim
12 words
The process according to claim 1 wherein said member is poly(caprolactone) diol.
Claim 10
Dependent Claim
12 words
The process according to claim 1 wherein said member is a polyether.
Claim 11
Dependent Claim
34 words
The process according to claim 1 wherein said member is a polyester and said TDI mixture consists essentially of 65 wt.% to 75 wt.% 2,4 TDI and 35 wt.% to 25 wt.% 2,6 TDI.
Claim 12
Dependent Claim
103 words
A process for making a prepolymer for use in making a urethane elastomer comprising the steps of: reacting a mixture of approximately 1.5 to 2.5 equivalents of toluene diisocyanate consisting of approximately 84 wt.% to 96 wt.% 2,4 toluene diisocyanate and 16 wt.% to 4 wt.% 2,6 toluene diisocyanate, with approximately 1 equivalent of a member selected from the group consisting of polyethers having difunctional primary hydroxyl groups, saturated difunctional primary hydroxyl polyesters, and mixtures thereof to form a urethane prepolymer, said member having a molecular weight selected such that the molecular weight of the resulting prepolymer is between about 500 and 4,000.
Claim 13
Dependent Claim
103 words
A process for making a prepolymer for use in making a urethane elastomer comprising the steps of: reacting a mixture of approximately 1.5 to 2.5 equivalents of toluene diisocyanate consisting of approximately 84 wt.% to 96 wt.% 2,4 toluene diisocyanate and 16 wt.% to 4 wt.% 2,6 toluene diisocyanate, with approximately 1 equivalent of a member selected from the group consisting of polyethers having difunctional primary hydroxyl groups, saturated difunctional primary hydroxyl polyesters, and mixtures thereof to form a urethane prepolymer, said member having a molecular weight selected such that the molecular weight of the resulting prepolymer is between about 500 and 4,000.
Claim 14
Dependent Claim
13 words
The process according to claim 11 wherein said member is polytetramethylene ether glycol.
Claim 15
Dependent Claim
17 words
The process according to claim 12 wherein said toluene diisocyanate mixture comprises approximately 88% 2,4 toluene diisocyanate.
Claim 16
Dependent Claim
38 words
The process according to claim 13 wherein said toluene diisocyanate mixture is prepared by mixing 1.2 equivalents of a mixture containing 80% 2,4 toluene diisocyanate and 20% 2,6 toluene diisocyanate, with 0.8 equivalents of pure 2,4 toluene diisocyanate.
Claim 17
Dependent Claim
18 words
The process according to claim 13 wherein said polytetramethylene ether glycol has a molecular weight of approximately 2,000.
Claim 18
Dependent Claim
35 words
The process according to claim 13 wherein said toluene diisocyanate mixture and said polytetramethylene ether glycol are reacted together for approximately 12 to 15 minutes at a temperature of approximately 184° F. to 187° F.
Claim 19
Dependent Claim
13 words
The process according to claim 11 wherein said member is caprolactone ethtylene glycol.
Claim 20
Dependent Claim
12 words
The process according to claim 11 wherein said member is a polyether.
Claim 21
Dependent Claim
12 words
A product produced according to the process of claim 11 or 12.
Claim 22
Dependent Claim
12 words
A product produced according to the process of claim 13 or 14.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |