Patent US3725348A successfully refreshed from Google Patents.
US3725348A
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US
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Polyester modified with metal salts of sulfoisophthalic acid esters and poly(ethylene oxide) end capped with alkyl groups
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-12-23
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Granted: 1973-04-03
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Expires: 1990-12-23
Abstract
Abstract Copolyesters of improved affinity for dyestuffs are manufactured by incorporating a poly(alkylene oxide) into a copolyester of which a proportion of the structural units are organic radicals containing at least one sulphonate group as the metal salt.
Inventors
- 👤 A Harrison
- 👤 J Mather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/922
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A glycol selected from the group consisting of ethylene glycol and 1:4 bis(hydroxymethyl)cyclohexane, and
Claim 2
Dependent Claim
17 words
The fiber of claim 1, wherein said acid is terephthalic acid and said glycol is ethylene glycol.
Claim 3
Dependent Claim
10 words
The fiber of claim 2, wherein said metal is sodium.
Claim 4
Dependent Claim
87 words
the alkali metal or alkaline earth metal salt(s) of dimethyl-5-sulfo-isophthalate, from about 0.5 to 10 structural units per 100 total structural units of said fiber-forming material of said copolyester being organic radicals derived from said alkali metal or alkaline earth metal salts of dimethyl-5-sulfoisophthalate; and b. said copolyester is physically admixed with from about 1 to about 15 weight based upon the weight of the total mixture percent of a double end-capped alkyl terminated poly (ethylene oxide) which has a molecular weight of from 500 to 20,000.
Claim 5
Dependent Claim
23 words
The fiber of claim 3, wherein said alkyl is methyl and said methyl terminated poly(ethylene oxide) has a molecular weight of about 1540.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |