US4229565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyarylates from dihydric phenols, aromatic dicarboxylic acid and a chlorinating agent
Assignee: BP Corp North America Inc
•
Filing: 1979-05-14
•
Granted: 1980-10-21
•
Expires: 1999-05-14
Abstract
Abstract High molecular weight, thermally stable polyarylates are prepared directly from dihydric phenols, aromatic dibasic acids and a chlorinating agent without isolating an acyl halide intermediate. An organic phosphite can be added to reduce color formation.
Inventors
- 👤 Hugh C. Gardner
- 👤 Markus Matzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:58
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/16; C08G63/18; C08G63/19
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
A method for preparing polyarylates which comprises: (a) mixing at least one aromatic dicarboxylic acid having 8 to about 20 carbon atoms with a stoichiometric excess of a chlorinating agent, (b) heating the mixture from (a) at a temperature of about 25° to about 180° C., until essentially all of the dicarboxylic acid groups are reacted, (c) removing unreacted chlorinating agent, (d) determining the amount of active chlorine in the resultant mixture, (e) adding an approximately stoichiometric amount of at least one dihydric phenol, based on the amount of active chlorine present, and (f) polymerizing the mixture from step (e) until a polyarylate having a reduced viscosity of at least 0.4 in p-chlorophenol at 49° C. at a concentration of 0.2 g/dl. forms.
Claim 2
Independent Claim
123 words
A method for preparing polyarylates which comprises: (a) mixing at least one aromatic dicarboxylic acid having 8 to about 20 carbon atoms with a stoichiometric excess of a chlorinating agent, (b) heating the mixture from (a) at a temperature of about 25° to about 180° C., until essentially all of the dicarboxylic acid groups are reacted, (c) removing unreacted chlorinating agent, (d) determining the amount of active chlorine in the resultant mixture, (e) adding an approximately stoichiometric amount of at least one dihydric phenol, based on the amount of active chlorine present, and (f) polymerizing the mixture from step (e) until a polyarylate having a reduced viscosity of at least 0.4 in p-chlorophenol at 49° C. at a concentration of 0.2 g/dl. forms.
Claim 3
Dependent Claim
21 words
A method claimed as in claim 1 wherein the aromatic dicarboxylic acid is terephthalic acid, isophthalic acid or a mixture thereof.
Claim 4
Dependent Claim
17 words
A method claimed as in claim 1 wherein the aromatic dicarboxylic acid is a naphthalene dicarboxylic acid.
Claim 5
Dependent Claim
14 words
A method claimed as in claim 1 wherein the dihydric phenol is 2,2-bis(4-hydroxyphenyl) propane.
Claim 6
Dependent Claim
13 words
A method claimed as in claim 1 wherein the dihydric phenol is hydroquinone.
Claim 7
Dependent Claim
14 words
A method claimed as in claim 1 wherein the dihydric phenol is a biphenol.
Claim 8
Dependent Claim
26 words
A method claimed as in claim 1 wherein the chlorinating agent is selected from the group consisting of thionyl chloride, phosgene, phosphorous halides and chlorinated hydrocarbons.
Claim 9
Dependent Claim
38 words
A method claimed as in claim 1 wherein the polymerization is carried out in an inert organic solvent in the presence of a basic catalyst and an acid acceptor at a temperature of about 0° to 100° C.
Claim 10
Dependent Claim
16 words
A method as in claim 1 wherein the polymerization is carried out by an interfacial process.
Claim 11
Dependent Claim
38 words
A method as in claim 9 wherein the crude acid chloride in an inert organic solvent is stirred with an aqueous solution of a dialkali metal salt of a dihydric phenol in the presence of an emulsifying agent.
Claim 12
Dependent Claim
28 words
A method claimed as in claim 1 wherein the polymerization is carried out in an inert organic solvent at a temperature of about 150° to about 250° C.
Claim 13
Dependent Claim
60 words
A method claimed as in claim 1 wherein the chlorinating agent used contains about 0.05 to about 6 percent by weight of a trivalent phosphorous compound having the formula (Q) 3 P wherein Q is R or --OR and R is aryl having 6 to 18 carbons, optionally substituted with halogen or alkyl groups having 1 to about 4 carbons.
Claim 14
Dependent Claim
15 words
A method as claimed in claim 12 wherein the trivalent phosphorous compound is triphenyl phosphite.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |