Patent US5657818A successfully refreshed from Google Patents.
Patent US4156068A successfully refreshed from Google Patents.
US4156068A
Expired / Lapsed
US
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High molecular weight polyethersulfones
Assignee: Zeneca Inc
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Filing: 1978-05-17
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Granted: 1979-05-22
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Expires: 1998-05-17
Abstract
Abstract High molecular weight polyether-sulfones are prepared by reacting a 3,3',5,5'-tetraalkyl-4,4'-dihydroxybiphenyl with 4,4'-dihalodiphenyl sulfone and from about 0 to 30 percent stoichiometric excess of an alkali metal carbonate or bicarbonate compound in the presence of a dipolar aprotic solvent. The polyethersulfone polymers and products made therefrom possess low density and high glass transition temperatures while maintaining good solvent resistance and good tensile, flexural, and hardness properties.
Inventors
- 👤 Ludwig A. Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:47
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
53 words
A process to prepare polyethersulfone polymers having a molecular weight from between 20,000 to 125,000 which comprises reacting substantially equimolar amount of a 3,3,'5,5'-tetraalkyl-4,4'-dihydroxybiphenyl and a dihalodiphenylsulfone compound in the presence of a dipolaraprotic solvent and from about 1 to 1.33 moles of an alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 2
Dependent Claim
53 words
A process to prepare polyethersulfone polymers having a molecular weight from between 20,000 to 125,000 which comprises reacting substantially equimolar amount of a 3,3,'5,5'-tetraalkyl-4,4'-dihydroxybiphenyl and a dihalodiphenylsulfone compound in the presence of a dipolaraprotic solvent and from about 1 to 1.33 moles of an alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 3
Dependent Claim
12 words
A process as claimed in claim 1 wherein the dihalodiphenylsulfone is 4,4'dichlorodiphenylsulfone.
Claim 4
Dependent Claim
12 words
A process as claimed in claim 1 wherein the biphenol is 3,3'5,5'-tetramethyl-4,4'-dihydroxybiphenyl.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1 wherein the alkali metal carbonate is potassium carbonate.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 4 wherein the amount of potassium carbonate is from 1.05 to 1.26 moles of alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 7
Dependent Claim
30 words
A process as claimed in claim 4 wherein the amount of potassium carbonate is from about 1.1 to 1.20 moles of alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 8
Dependent Claim
25 words
A process as claimed in claim 1 wherein the dipolar aprotic solvent is selected from the class consisting of dimethylacetamide, hexamethylphosphoramide, sulfolane, tetramethylurea and diphenylsulfone.
Claim 9
Dependent Claim
12 words
A process as claimed in claim 7 wherein the solvent is dimethylacetamide.
Claim 10
Dependent Claim
37 words
A process as claimed in claim 1 which comprises reacting a substantially equimolar amount of a 3,3',5,5'-tetramethyl-4,4'-dihydroxybiphenyl and 4,4'dichlorodiphenylsulfone in the presence of dimethylacetamide as a solvent and from about 0-30 percent stoichiometric excess of potassium carbonate.
Claim 11
Dependent Claim
32 words
A polyethersulfone polymer prepared by the method of claim 1 derived from 3,3',5,5'-tetraalkyl-4,4'-dihydroxybiphenyl said polymer having a molecular weight of 20,000 to 125,000 and a density of no more than 1.20 gm/cc.
Claim 12
Dependent Claim
12 words
A polymer as claimed in claim 10 wherein the biphenol is 3,3',5,5'-tetramethyl-4,4'-dihydroxybiphenyl.
Claim 13
Dependent Claim
11 words
A shaped article containing a polymer as claimed in claim 10.
Claim 14
Dependent Claim
11 words
An article as claimed in claim 12 which is a film.
Claim 15
Dependent Claim
18 words
A polymer as claimed in claim 10 which has been purified by spontaneous reprecipitation from a cyclic ether.
Claim 16
Dependent Claim
13 words
A polymer as claimed in claim 14 wherein the cyclic ether is dioxane.
Claim 17
Dependent Claim
19 words
A shaped article as claimed in claim 12 having a flexural strength of from about 14,000 to 21,000 psi.
Claim 18
Dependent Claim
16 words
A shaped article as claimed in claim 12 having a tensile strength of about 8900 psi.
Claim 19
Dependent Claim
20 words
A shaped article as claimed in claim 12 having a tensile strength of from about 8900 to about 12,400 psi.
Claim 20
Dependent Claim
12 words
An article as claimed in claim 12 which is a molded part.
Claim 21
Dependent Claim
82 words
A process to prepare polyethersulfone polymers having a molecular weight from between about 20,000 to about 125,000 and a minimum glass transition temperature of 250° C. which polymers are useful in the manufacture of shaped articles having a density of no more than 1.20 gm/cc which comprises reacting substantially equimolar amount of a 3,3',5,5'-tetraalkyl-4,4,'-dihydroxybiphenyl and a dihalodiphenylsulfone compound in the presence of a dipolar aprotic solvent and from about 1-1.33 moles of an alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 22
Dependent Claim
82 words
A process to prepare polyethersulfone polymers having a molecular weight from between about 20,000 to about 125,000 and a minimum glass transition temperature of 250° C. which polymers are useful in the manufacture of shaped articles having a density of no more than 1.20 gm/cc which comprises reacting substantially equimolar amount of a 3,3',5,5'-tetraalkyl-4,4,'-dihydroxybiphenyl and a dihalodiphenylsulfone compound in the presence of a dipolar aprotic solvent and from about 1-1.33 moles of an alkali metal carbonate or bicarbonate per mole of dihydroxybiphenyl.
Claim 23
Dependent Claim
24 words
A process as claimed in claim 20 which further comprises the step of purifying the polymers by the spontaneous reprecipitation from a cyclic ether.
Claim 24
Dependent Claim
14 words
A process as claimed in claim 21 wherein the cyclic ether is a dioxane.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |