US4190711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyether polyurethane elastomers
Assignee: Lyondell Chemical Technology LP
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Filing: 1977-09-29
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Granted: 1980-02-26
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Expires: 1997-09-29
Abstract
Abstract Thermoplastic polyether polyurethane elastomers are provided by reacting and forming: (a) a novel liquid polyurethane quasi-prepolymer having a free NCO content of from about 16 percent to about 25 percent; (b) a reactive poly(oxypropylene-oxyethylene) diol; and (c) as an extender, a short chain diol in the presence of (d) a catalyst. The elastomers can be either solid or microcellular, and they are suitable for production using Reaction Injection Molding (RIM) or conventional casting technology. The elastomers are useful in the production of automotive body panels, gears, seals and the like, and, since the elastomers are thermoplastic, any excess elastomer ("scrap") can be reused.
Inventors
- 👤 Richard J. Zdrahala
- 👤 Frank E. Critchfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/08; C08G18/10; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0066; C08G2120/00; Y; Y10; Y10S; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
151 words
A process for producing a solid or microcellular polyether polyurethane elastomer which comprises reacting a reaction mixture containing: (a) a liquid polyurethane quasi-prepolymer having a free NCO content of from about 16 percent to about 25 percent in an amount that provides from 0.8 to 1.1 isocyanato groups per active hydrogen group in the reaction mixture, produced by reacting a poly(oxypropylene-oxyethylene)diol having a molecular weight of at least 500 with an aromatic diisocyanate, (b) a poly(oxypropylene-oxyethylene) diol having a molecular weight of at least 1000, having terminal oxyethylene groups, and having a primary hydroxyl content of at least 50 mole percent, (c) from 5 to 75 parts by weight of a diol extender selected from the group consisting of short-chain alkane diols and short-chain oxyalkylene glycols per 95 to 25 parts by weight of (b), and (d) a catalytic amount of catalyst for curing the reaction mixture to produce the elastomer.
Claim 2
Dependent Claim
151 words
A process for producing a solid or microcellular polyether polyurethane elastomer which comprises reacting a reaction mixture containing: (a) a liquid polyurethane quasi-prepolymer having a free NCO content of from about 16 percent to about 25 percent in an amount that provides from 0.8 to 1.1 isocyanato groups per active hydrogen group in the reaction mixture, produced by reacting a poly(oxypropylene-oxyethylene)diol having a molecular weight of at least 500 with an aromatic diisocyanate, (b) a poly(oxypropylene-oxyethylene) diol having a molecular weight of at least 1000, having terminal oxyethylene groups, and having a primary hydroxyl content of at least 50 mole percent, (c) from 5 to 75 parts by weight of a diol extender selected from the group consisting of short-chain alkane diols and short-chain oxyalkylene glycols per 95 to 25 parts by weight of (b), and (d) a catalytic amount of catalyst for curing the reaction mixture to produce the elastomer.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the reaction mixture also contains: (e) a blowing agent in an amount sufficient to produce a microcellular structure in the elastomer.
Claim 4
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 2.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein the poly(oxypropylene-oxyethylene) diol is a polymer/poly(oxypropyleneoxyethylene) diol.
Claim 6
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 4.
Claim 7
Dependent Claim
12 words
The process of claim 2 wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 8
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 6.
Claim 9
Dependent Claim
13 words
The process of claim 2 wherein the extender is a short-chain alkane diol.
Claim 10
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 8.
Claim 11
Dependent Claim
11 words
The process of claim 8 wherein the alkane diol is 1,4-butanediol.
Claim 12
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 10.
Claim 13
Dependent Claim
13 words
The process of claim 2 wherein the extender is a short-chain oxyalkylene glycol.
Claim 14
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 12.
Claim 15
Dependent Claim
13 words
The process of claim 1 wherein the reaction mixture contains no blowing agent.
Claim 16
Dependent Claim
10 words
A solid elastomer produced by the process of claim 14.
Claim 17
Dependent Claim
13 words
The process of claim 14 wherein the poly(oxypropylene-oxyethylene) diol is a polymer/poly(oxypropyleneoxyethylene) diol.
Claim 18
Dependent Claim
10 words
A solid elastomer produced by the process of claim 16.
Claim 19
Dependent Claim
12 words
The process of claim 14 wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 20
Dependent Claim
10 words
A solid elastomer produced by the process of claim 18.
Claim 21
Dependent Claim
13 words
The process of claim 14 wherein the extender is a short-chain alkane diol.
Claim 22
Dependent Claim
10 words
A solid elastomer produced by the process of claim 20.
Claim 23
Dependent Claim
11 words
The process of claim 20 wherein the alkane diol is 1,4-butanediol.
Claim 24
Dependent Claim
10 words
A solid elastomer produced by the process of claim 22.
Claim 25
Dependent Claim
13 words
The process of claim 14 wherein the extender is a short-chain oxyalkylene glycol.
Claim 26
Dependent Claim
10 words
A solid elastomer produced by the process of claim 24.
Claim 27
Dependent Claim
24 words
The process of claim 1 wherein the liquid polyurethane quasi-prepolymer has a free NCO content of from about 18 percent to about 22 percent.
Claim 28
Dependent Claim
10 words
A solid elastomer produced by the process of claim 26.
Claim 29
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 26.
Claim 30
Dependent Claim
20 words
The process of claim 1 wherein the reaction mixture also contains: (f) a minor amount of a block copolymer surfactant.
Claim 31
Dependent Claim
16 words
The process of claim 29 wherein the block copolymer surfactant is a polyoxyalkylene block copolymer surfactant.
Claim 32
Dependent Claim
17 words
The process of claim 30 wherein the polyoxyalkylene block copolymer surfactant is a polyoxypropylenepolyoxyethylene block copolymer surfactant.
Claim 33
Dependent Claim
15 words
The process of claim 29 wherein the block copolymer surfactant is a siloxane-polyoxyalkylene block copolymer.
Claim 34
Dependent Claim
38 words
A liquid polyurethane quasi-prepolymer having a free NCO content of from about 16 percent to about 25 percent that is produced by reacting a poly(oxypropyleneoxyethylene) diol having a molecular weight of at least 500 with an aromatic diisocyanate.
Claim 35
Dependent Claim
38 words
A liquid polyurethane quasi-prepolymer having a free NCO content of from about 16 percent to about 25 percent that is produced by reacting a poly(oxypropyleneoxyethylene) diol having a molecular weight of at least 500 with an aromatic diisocyanate.
Claim 36
Dependent Claim
12 words
The quasi-prepolymer of claim 37 wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 37
Dependent Claim
20 words
The quasi-prepolymer of claim 32 wherein the poly(oxypropylene-oxyethylene) diol has a molecular weight of from about 1,500 to about 2,500.
Claim 38
Dependent Claim
19 words
The quasi-prepolymer of claim 33 having a free NCO content of from about 18 percent to about 22 percent.
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |