US4243760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction injection molded polyurethane
Assignee: Huntsman Corp
•
Filing: 1979-05-23
•
Granted: 1981-01-06
•
Expires: 1999-05-23
Abstract
Abstract Covers a polyurethane elastomer of improved moldability, particularly useful in RIM applications which comprises the reaction product of an aromatic polyisocyanate, a high molecular weight polyether triol containing an internal mixed propylene oxide-ethylene oxide segment comprising 2-35% ethylene oxide by weight and 65-98% by weight of propylene oxide and an ethylene oxide cap such that said polyol has a primary hydroxyl content greater than 50% and preferably greater than 90%, and a chain-extending agent. Also covers the method of making said elastomer.
Inventors
- 👤 Kenneth G. McDaniel
- 👤 Doris M. Rice
- 👤 Michael Cuscurida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G2120/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A reaction injection molded polyurethane elastomer having improved moldability and other improved properties comprising the reaction product of an aromatic polyisocyanate, a high molecular weight triol containing an internal mixed propylene oxide-ethylene oxide segment comprising 2-35% by weight of ethylene oxide and 65-98% by weight of propylene oxide and an ethylene oxide cap such that said triol has a primary hydroxyl content greater than 50% and a chain-extending agent.
Claim 2
Dependent Claim
69 words
A reaction injection molded polyurethane elastomer having improved moldability and other improved properties comprising the reaction product of an aromatic polyisocyanate, a high molecular weight triol containing an internal mixed propylene oxide-ethylene oxide segment comprising 2-35% by weight of ethylene oxide and 65-98% by weight of propylene oxide and an ethylene oxide cap such that said triol has a primary hydroxyl content greater than 50% and a chain-extending agent.
Claim 3
Dependent Claim
14 words
The polyurethane of claim 1 wherein said triol has an equivalent weight of 1300-3000.
Claim 4
Dependent Claim
12 words
The polyurethane of claim 1 wherein said aromatic polyisocyanate is methylene bis(4-phenylisocyanate).
Claim 5
Dependent Claim
12 words
The polyurethane of claim 1 wherein said chain-extending agent is ethylene glycol.
Claim 6
Dependent Claim
11 words
The polyurethane of claim 1 wherein said chain-extending agent is 1,4-butanediol.
Claim 7
Dependent Claim
23 words
The polyurethane of claim 1 wherein said high molecular weight triol is a polyether triol having a primary hydroxyl content greater than 90%.
Claim 8
Independent Claim
91 words
A method of making a polyurethane elastomer of improved moldability which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation and demolding the molded article, said formulation being the reaction product of an aromatic polyisocyanate, a high molecular weight triol containing an internal mixed propylene oxide-ethylene oxide segment comprising 2-35% by weight of ethylene oxide and 65-98% by weight of propylene oxide and an ethylene oxide cap such that said triol has a primary hydroxyl content greater than 50%, and a chain-extending agent.
Claim 9
Independent Claim
91 words
A method of making a polyurethane elastomer of improved moldability which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation and demolding the molded article, said formulation being the reaction product of an aromatic polyisocyanate, a high molecular weight triol containing an internal mixed propylene oxide-ethylene oxide segment comprising 2-35% by weight of ethylene oxide and 65-98% by weight of propylene oxide and an ethylene oxide cap such that said triol has a primary hydroxyl content greater than 50%, and a chain-extending agent.
Claim 10
Dependent Claim
22 words
The method of claim 7 wherein said high molecular weight triol has an equivalent weight of from about 1500 to about 3000.
Claim 11
Dependent Claim
13 words
The method of claim 7 wherein said aromatic polyisocyanate is methylene bis (4-phenylisocyanate).
Claim 12
Dependent Claim
11 words
The method of claim 7 wherein chain-extending agent is ethylene glycol.
Claim 13
Dependent Claim
11 words
The method of claim 7 wherein said chain-extending agent is 1,4-butanediol.
Claim 14
Dependent Claim
23 words
The method of claim 7 wherein said high molecular weight is a polyether triol and has a primary hydroxyl content greater than 90%.
References Cited (Backward Citations)
US3535307A
Cited
US3630973A
Cited
US3857800A
Cited
US4065410A
Cited
US4125505A
Cited
US4126742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |