US4373084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-modified polypropylene ether glycols, a method for preparing them, and polyurethanes prepared therefrom
Assignee: EIDP Inc
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Filing: 1981-07-07
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Granted: 1983-02-08
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Expires: 2001-07-07
Abstract
Abstract Polypropylene ether glycol is modified so that it contains 1-25%, by weight of β,β'-dihydroxyalkyl sulfide moieties. These modified polypropylene ether glycols have enhanced resistance to degradation by heat and oxygen. The invention also relates to a method of making the modified PPG's, to their use as stabilizers against the degradation of the polyether chain, and to polyurethanes made with them.
Inventors
- 👤 Ivan M. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/52; C08G18/48; C08G18/50; C08G18/5072; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
Polypropylene ether glycol modified so that it contains in its chain 1-25%, by weight, of moieties represented by the structure ##STR3## where R is hydrogen, an alkyl radical of 1-3 carbon atoms or phenyl, and the oxygen atom is linked to a hydrogen atom or a carbon atom.
Claim 2
Dependent Claim
48 words
Polypropylene ether glycol modified so that it contains in its chain 1-25%, by weight, of moieties represented by the structure ##STR3## where R is hydrogen, an alkyl radical of 1-3 carbon atoms or phenyl, and the oxygen atom is linked to a hydrogen atom or a carbon atom.
Claim 3
Dependent Claim
16 words
The polypropylene ether glycol of claim 1 having an oxygen/sulfur atom ratio of 3/1 or greater.
Claim 4
Dependent Claim
27 words
The polypropylene ether glycol of claims 1 or 2 in which the moieties are represented by the structure --O--CH 2 CH 2 --S--CH 2 CH 2 --.
Claim 5
Dependent Claim
18 words
The copolyether glycol of claims 1, 2 or 3, which has a number average molecular weight of 500-10,000.
Claim 6
Dependent Claim
22 words
A mixture of unmodified polypropylene ether glycol and 0.4-20%, by weight of the mixture, of the polypropylene ether glycol of claim 1.
Claim 7
Dependent Claim
22 words
A mixture of unmodified polypropylene ether glycol and 0.4-20%, by weight of the mixture, of the polypropylene ether glycol of claim 2.
Claim 8
Dependent Claim
22 words
A mixture of unmodified polypropylene ether glycol and 0.4-20%, by weight of the mixture, of the polypropylene ether glycol of claim 3.
Claim 9
Dependent Claim
22 words
A mixture of unmodified polypropylene ether glycol and 0.4-20%, by weight of the mixture, of the polypropylene ether glycol of claim 4.
Claim 10
Dependent Claim
29 words
A polyurethane which is the reaction product of (a) the polypropylene ether glycol of claim 1, 2, 3 or 4; (b) an organic polyisocyanate; and (c) a chain extender.
Claim 11
Dependent Claim
27 words
A polyurethane which is the reaction procuct of (a) the mixture of claim 5, 6, 7 or 8; (b) an organic polyisocyanate; and (c) a chain extender.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |