US4701476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers prepared from high molecular weight prepolymers
Assignee: Dow Chemical Co
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Filing: 1985-12-27
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Granted: 1987-10-20
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Expires: 2005-12-27
Abstract
Abstract This invention is an improvement in a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material. In another aspect, this invention is a quasi-prepolymer which comprises a solution of an isocyanate-terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
Inventors
- 👤 Donald J. Burchell, Jr.
- 👤 Richard D. Peffley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G2120/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
In a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated Quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the Quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
Claim 2
Dependent Claim
87 words
In a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated Quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the Quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said prepolymer has a isocyanate content of about 1 to about 8% by weight.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said Quasi-prepolymer has an equivalent weight of about 200 to about 525.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said prepolymer comprises the reaction product of an isocyanate-reactive material having an equivalent weight of about 700 to about 2000 and an aromatic polyisocyanate.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein said isocyanate-reactive material is a polyether polyol or amine-terminated polyether and the aromatic polyisocyanate comprises 2,4'-and/or 4,4'-diphenylmethanediisocyanate or derivatives thereof.
Claim 7
Dependent Claim
20 words
The process of claim 5 wherein said polyurethane and/or polyurea polymer has a density of at least about 0.95 g/cc.
Claim 8
Dependent Claim
21 words
The process of claim 4 wherein said active hydrogen containing composition comprises a relatively low equivalent weight active hydrogen containing material.
Claim 9
Dependent Claim
22 words
The process of claim 7 wherein said active hydrogen containing composition further comprises a relatively high equivalent weight active hydrogen containing material.
Claim 10
Dependent Claim
20 words
The process of claim 7 wherein about 0.95 to about 1.3 isocyanate groups are present per active hydrogen containing moiety.
Claim 11
Dependent Claim
30 words
The process of claim 3 wherein said prepolymer comprises the reaction product of an isocyanate-reactive material having an equivalent weight of about 700 to about 2000 and an aliphatic polyisocyante.
Claim 12
Dependent Claim
17 words
The process of claim 10 wherein said isocyanate-reactive material is a polyether polyol or an amine-terminated polyether.
Claim 13
Dependent Claim
55 words
A Quasi-prepolymer which comprises a solution of an isocyanate-terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
Claim 14
Dependent Claim
55 words
A Quasi-prepolymer which comprises a solution of an isocyanate-terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
Claim 15
Dependent Claim
20 words
The Quasi-prepolymer of claim 12 wherein said prepolymer has an isocyanate content of about 1 to about 8% by weight.
Claim 16
Dependent Claim
16 words
The Quasi-prepolymer of claim 13 which has an equivalent weight of about 200 to about 525.
Claim 17
Dependent Claim
30 words
The Quasi-prepolymer of claim 14 wherein said prepolymer comprises the reaction product of an isocyanate-reactive material having an equivalent weight of about 700 to about 2000 and an aromatic polyisocyanate.
Claim 18
Dependent Claim
27 words
The Quasi-prepolymer of claim 15 wherein said isocyanate-reactive material is a polyether polyol or amine-terminated polyether and the aromatic polyisocyanate comprises 2,4'- and/or 4,4'-diphenylmethanediisocyanate or derivatives thereof.
Claim 19
Dependent Claim
30 words
The Quasi-prepolymer of claim 14 wherein said prepolymer comprises the reaction product of an isocyanate-reactive material having an equivalent weight of about 700 to about 2000 and an aliphatic polyisocyante.
Claim 20
Dependent Claim
17 words
The Quasi-prepolymer of claim 17 wherein said isocyanate-reactive material is a polyether polyol or an amine-terminated polyether.
References Cited (Backward Citations)
US4327204A
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |