Patent US4035343A successfully refreshed from Google Patents.
US4035343A
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Flame resistant synthetic linear polyesters and shaped structures made thereof
Assignee: Hoechst AG
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Filing: 1973-08-23
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Granted: 1977-07-12
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Expires: 1993-08-23
Abstract
Abstract Permanently flame-resistant synthetic linear polyesters are obtained by irporating by condensation into the polyester composed of the usual dicarboxylic acid and diol units an alkylphosphine oxide of the formula ##SPC1## Wherein the radicals R to R 4 represent organic radicals of which R 2 , R 3 and Z may be substituted by 2 hydroxyl groups altogether, R 2 , R 3 and R 4 may also represent hydrogen and a is zero or a whole number of from 1 to 4. The flame-resistant polyesters are processed into shaped structures such as fibers, filaments, sheets, injection and compression molded articles characterized by good flameproofness and dyeing properties.
Inventors
- 👤 Ulrich Bollert
- 👤 Hans-Jerg Kleiner
- 👤 Franz Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/692; C08G63/6924; C08G63/6926; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
Flame-resistant, synthetic, linear and phosphorus-containing polyesters consisting essentially of dicarboxylic acid and diol units and wherein 4 to 15 mole % of the diol units are derived from a diol of the formula ##SPC9## wherein R and R 1 are alkyl or cycloalkyl radicals of up to 12 carbon atoms, R 2 and R 3 are hydrogen or an alkyl radical of 1 to 4 carbon atoms which may be substituted by hydroxyl, R 4 is hydrogen or an alkyl radical of 1 to 4 carbon atoms, Z is an alkyl radical of 1 to 4 carbon atoms substituted by 1 or 2 hydroxyl groups, a is zero to 4, and the total number of hydroxyl groups on the radicals R 2 , R 3 and Z is 2.
Claim 2
Dependent Claim
129 words
Flame-resistant, synthetic, linear and phosphorus-containing polyesters consisting essentially of dicarboxylic acid and diol units and wherein 4 to 15 mole % of the diol units are derived from a diol of the formula ##SPC9## wherein R and R 1 are alkyl or cycloalkyl radicals of up to 12 carbon atoms, R 2 and R 3 are hydrogen or an alkyl radical of 1 to 4 carbon atoms which may be substituted by hydroxyl, R 4 is hydrogen or an alkyl radical of 1 to 4 carbon atoms, Z is an alkyl radical of 1 to 4 carbon atoms substituted by 1 or 2 hydroxyl groups, a is zero to 4, and the total number of hydroxyl groups on the radicals R 2 , R 3 and Z is 2.
Claim 3
Dependent Claim
29 words
Shaped structures such as fibers, filaments, sheets, injection and compression molded articles and hollow bodies made from flame resistant, synthetic, linear and phosphorus-containing polyesters as defined in claim 1.
Claim 4
Dependent Claim
31 words
Flame-resistant, synthetic, linear and phosphorus-containing polyester consisting essentially of dicarboxylic acid and diol units and wherein 4 to 15 mole % of the diol units are units of the formula ##SPC10##
Claim 5
Dependent Claim
31 words
Flame-resistant, synthetic, linear and phosphorus-containing polyester consisting essentially of dicarboxylic acid and diol units and wherein 4 to 15 mole % of the diol units are units of the formula ##SPC10##
Claim 6
Dependent Claim
22 words
Flame-resistant, synthetic, linear and phosphorus containing polyesters as claimed in claim 3, containing 5 to 10 mole % of the phosphorus-containing units.
Claim 7
Dependent Claim
36 words
Flame-resistant synthetic linear and phosphorus-containing polyesters as claimed in claim 3, wherein the dicarboxylic acid units are essentially terephthalic acid units and at least 85 mole % of the diol units are units of ethylene glycol.
Claim 8
Dependent Claim
12 words
Shaped articles made from the flame-resistant polyesters as claimed in claim 3.
References Cited (Backward Citations)
BE771302A
Cited
US3629365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |