Patent US3937755A successfully refreshed from Google Patents.
US3937755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters having improved disperse dyeability
Assignee: Shell USA Inc
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Filing: 1975-01-23
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Granted: 1976-02-10
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Expires: 1995-01-23
Abstract
Abstract Polyethylene terephthalate block copolyesters having ethylene terephthalate blocks and hydantoin polymer blocks for improved disperse dyeability and improved antistatic properties. The copolyesters are prepared by conventional methods using blocks of low molecular weight polyethylene terephthalate and hydantoin polyester.
Inventors
- 👤 Maneung Hahn
- 👤 Leroy C. T. Lin
- 👤 William C. T. Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:16
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A polyethylene terephthalate block copolyester in which the copolyester comprises a polymer of a derivative of a hydantoin diacid and a hydantoin diol having the general formula ##EQU2## where R 1 and R 2 are hydrogen, alkyl, aryl, aralkyl and heterocyclic compounds, n and n' are integers from 1 to 10 and X is --OH in the hydantoin diol and --COOH in the hydantoin diacid said copolyester block being present in the polyethylene terephthalate block copolyester in an amount of from 1 to 20 percent by weight of said block copolyester.
Claim 2
Dependent Claim
91 words
A polyethylene terephthalate block copolyester in which the copolyester comprises a polymer of a derivative of a hydantoin diacid and a hydantoin diol having the general formula ##EQU2## where R 1 and R 2 are hydrogen, alkyl, aryl, aralkyl and heterocyclic compounds, n and n' are integers from 1 to 10 and X is --OH in the hydantoin diol and --COOH in the hydantoin diacid said copolyester block being present in the polyethylene terephthalate block copolyester in an amount of from 1 to 20 percent by weight of said block copolyester.
Claim 3
Dependent Claim
102 words
Block copolyester of claim 1 comprising blocks of polyethylene terephthalate and blocks of a copolyester formed by reacting a compound selected from the group consisting of (A) di(2-hydroxyethyl) dimethyl hydantoin, di(4-hydroxy butyl) dimethyl hydantoin, di(2-hydroxyethyl) diethyl hydantoin, di(2-hydroxyethyl) dipropyl hydantoin, di(2-hydroxyethyl) ditertiary butyl hydantoin, di(2-hydroxyethyl) diphenyl hydantoin, di(2-hydroxyethyl) phenyl hydantoin, and di(2-hydroxyethyl) methyl phenyl hydantoin, with a compound selected from the group consisting of (B) di(2-carboxymethyl) dimethyl hydantoin, di(2-carboxyethyl) dimethyl hydantoin, di(2-carboxyethyl) dimethyl hydantoin, di(4-carboxybuty) dimethyl hydantoin, di(2-carboxyethyl) diethyl hydantoin, di(2-carboxyethyl) dipropyl hydantoin, di(2-carboxyethyl) ditertiary butyl hydantoin, di(2-carboxyethyl) diphenyl hydantoin di(2-carboxyethyl) methyl phenyl hydantoin, di(2-carboxyethyl) benzyl hydantoin and di(2-carboxyethyl) methyl tryptophan hydantoin.
Claim 4
Dependent Claim
30 words
The block copolyester of claim 1 in which the copolyester is comprised of blocks of polyethylene terephthalate and blocks of a polymer of di(2-carboxyethyl) dimethyl hydantoin and di(2-hydroxyethyl) dimethyl hydantoin.
Claim 5
Dependent Claim
14 words
The polyethylene terephthalate block copolyester of claim 1 in the form of a fiber.
Claim 6
Dependent Claim
14 words
The polyethylene terephthalate block copolyester of claim 1 in the form of a film.
Claim 7
Dependent Claim
15 words
The polyethylene terephthalate block copolyester of claim 1 in the form of a molded product.
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) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |