US4456745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes prepared from polycarbonates
Assignee: Ethyl Corp
•
Filing: 1983-07-11
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Granted: 1984-06-26
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Expires: 2003-07-11
Abstract
Abstract A process for the production of a polycarbonate glycol wherein a cyclic carbonate is catalyzed at elevated temperature by a cationic initiator. Compounds of structure (I) <IMAGE> (I) where R is alkylene, R' and R'' are independently hydrogen, alkyl, alkaryl, aralkyl, or aryl, are heated at an elevated temperature in the presence of cationic initiators such as trimethyl aluminum to form a polymer. Production of a glycol product is assured by subsequent heating at about 200 DEG -220 DEG C. to form a polymer containing carbonate units of <IMAGE> and having hydroxy end units bonded to a carbon not part of a carbonate function. The molecular weight of polycarbonate glycol is preferably at least about 1,000. Valuable new prepolymer mixes and polyurethanes may be prepared using the novel polycarbonate glycols of the invention.
Inventors
- 👤 Sundar J. Rajan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
26 words
A prepolymer composition comprising a polyisocyanate and a polycarbonate glycol formed in a process comprising heating a cyclic carbonate in the presence of a cationic initiator.
Claim 2
Dependent Claim
26 words
A prepolymer composition comprising a polyisocyanate and a polycarbonate glycol formed in a process comprising heating a cyclic carbonate in the presence of a cationic initiator.
Claim 3
Dependent Claim
42 words
A polyol composition comprising a polyol selected from polytrimethylene ether glycol, polytetramethylene ether glycol, polyethylene glycol, and a polyester glycol in admixture with a polycarbonate glycol formed by heating a cyclic carbonate in the presence of a catalytic amount of cationic initiator.
Claim 4
Dependent Claim
42 words
A polyol composition comprising a polyol selected from polytrimethylene ether glycol, polytetramethylene ether glycol, polyethylene glycol, and a polyester glycol in admixture with a polycarbonate glycol formed by heating a cyclic carbonate in the presence of a catalytic amount of cationic initiator.
Claim 5
Dependent Claim
41 words
A polyurethane which is the reaction product of: (a) a polycarbonate glycol formed by heating a cyclic carbonate in the presence of a cationic initiator; (b) an organic polyisocyanate; and (c) an organic chain extender having at least two isocyanate-reactive hydrogens.
Claim 6
Dependent Claim
41 words
A polyurethane which is the reaction product of: (a) a polycarbonate glycol formed by heating a cyclic carbonate in the presence of a cationic initiator; (b) an organic polyisocyanate; and (c) an organic chain extender having at least two isocyanate-reactive hydrogens.
Claim 7
Dependent Claim
11 words
A polyurethane of claim 3 wherein the cyclic carbonate is 5,5-dimethyl-1,3-dioxan-2-one.
Claim 8
Dependent Claim
28 words
The polyurethane of claim 3 wherein said cationic initiator is a member selected from the group consisting of Lewis Acids, aluminum alkyls, boron halides, and aluminum alkyl halides.
Claim 9
Dependent Claim
12 words
The polyurethane of claim 5 wherein said member is an aluminum alkyl.
Claim 10
Dependent Claim
12 words
The polyurethane of claim 6 wherein said aluminum alkyl is trimethyl aluminum.
Claim 11
Dependent Claim
12 words
The polyurethane of claim 6 wherein said aluminum alkyl is triethyl aluminum.
Claim 12
Dependent Claim
15 words
The polyurethane of claim 3 wherein the polymerization is carried out at about 50°-250° C.
Claim 13
Dependent Claim
15 words
The polyurethane of claim 9 wherein said polymerization is carried out at about 150°-200° C.
Claim 14
Dependent Claim
15 words
The polyurethane of claim 3 wherein the polymerization is carried out in an organic solvent.
Claim 15
Dependent Claim
12 words
The polyurethane of claim 11 wherein said solvent is hexane or xylene.
Claim 16
Dependent Claim
19 words
The polyurethane of claim 3 further comprising the subsequent step of heating the polymerized product at about 200°-220° C.
Claim 17
Dependent Claim
15 words
The polyurethane of claim 3 wherein said polycarbonate glycol is recovered from a basic solution.
Claim 18
Dependent Claim
46 words
The polyurethane of claim 3 wherein the polycarbonate glycol contains units of ##STR16## and said cyclic carbonate is of structure I: ##STR17## where R is an alkylene group of 2 or more carbon atoms, and R' and R" are independently hydrogen, alkyl, alkaryl, aralkyl, or aryl.
Claim 19
Dependent Claim
16 words
The polyurethane of claim 15 wherein said cyclic carbonate is a 1,3-dioxan-2-one of structure II: ##STR18##
Claim 20
Dependent Claim
15 words
The polyurethane of claim 8 wherein the cyclic carbonate is heated at about 135°-200° C.
Claim 21
Dependent Claim
18 words
The polyurethane of claim 17 and further comprising subsequently heating the product so formed at about 200°-220° C.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |