Patent EP0213466A2 successfully refreshed from Google Patents.
EP0213466A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for preparing sulfonated polycarbonates and their use as flame retardants
Assignee: General Electric Co
•
Filing: 1986-08-11
•
Granted: —
•
Expires: 2006-08-11
Abstract
Abstract Polycarbonate resins are sulfonated by reaction with a sulfur trioxide-phosphate ester complex, preferably a 2:1 complex of sulfur trioxide with triethylphosphate. The sulfonated polymer is preferably converted to a salt, typically by reaction with a metal salt of a β-diketone in a non-polar medium. The resulting sulfonate salts are useful as flame retardant agents for aromatic polycarbonates.
Inventors
- 👤 John Bennie Yates Iii
- 👤 David John Smith
- 👤 John Robert Campbell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 13:12
CPC Classifications
C; C08; C08L; C08L69/00; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/081; C08G64/42
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
49 words
A method for sulfonating a polymer containing structural units of the formula wherein A 1 is a divalent aromatic hydrocarbon radical, which comprises reacting said polymer with a complex of sulfur trioxide with a phosphate ester having the formula wherein R is a lower alkyl or lower aryl radical.
Claim 2
Independent Claim
49 words
A method for sulfonating a polymer containing structural units of the formula wherein A 1 is a divalent aromatic hydrocarbon radical, which comprises reacting said polymer with a complex of sulfur trioxide with a phosphate ester having the formula wherein R is a lower alkyl or lower aryl radical.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein R is a straight chain alkyl radical having up to 4 carbon atoms.
Claim 4
Dependent Claim
20 words
A method according to claim 2 which also includes the step of neutralizing the sulfonated polymer in a non-aqueous medium.
Claim 5
Dependent Claim
45 words
A method according to claim 3 wherein A 1 has the formula wherein each of A 2 and A3 is a single-ring divalent aromatic radical and Y is a bridging radical in which one or two 2 3 atoms separate A from A 3 .
Claim 6
Dependent Claim
32 words
A method according to claim 4 wherein the molar ratio of sulfur trioxide to phosphate ester in the complex is 2:1 and the reaction temperature is in the range of about 10-50°C.
Claim 7
Dependent Claim
10 words
A method according to claim 5 wherein R is ethyl.
Claim 8
Dependent Claim
24 words
A method according to claim 6 wherein neutralization is achieved by contacting the sulfonated polymer with a metal salt of at least one β-diketone.
Claim 9
Dependent Claim
13 words
A method according to claim 7 wherein the metal is zinc or potassium.
Claim 10
Dependent Claim
21 words
A method according to claim 8 wherein the polymer has a weight average molecular weight within the range of about 10,000-100,000.
Claim 11
Dependent Claim
13 words
A method according to claim 9 wherein the polymer is a polycarbonate homopolymer.
Claim 12
Dependent Claim
19 words
A method according to claim 10 wherein each of A 2 and A3 is p-phenylene and Y is isopropylidene.
Claim 13
Dependent Claim
11 words
A method according to claim 11 wherein the a-diketone is 2,4-pentanedione.
Claim 14
Dependent Claim
29 words
A flame-resistant resinous composition comprising a major proportion of at least one aromatic polycarbonate and a minor proportion of a sulfonated polymer prepared by the method of claim 4.
Claim 15
Dependent Claim
14 words
A composition according to claim 13 wherein the polycarbonate is a bisphenol A polycarbonate.
Claim 16
Dependent Claim
42 words
A composition according to claim 14 wherein A has the formula wherein each of A 2 and A 3 is a single-ring divalent aromatic radical and Y is a bridging radical in which one or two atoms separate A from A .
Claim 17
Dependent Claim
16 words
A composition according to claim 15 wherein the sulfonated polymer is a zinc or potassium salt.
Claim 18
Dependent Claim
22 words
A composition according to claim 16 wherein the sulfonated polymer has a weight average molecular weight within the range of about 10,000-100,000.
Claim 19
Dependent Claim
14 words
A composition according to claim 17 wherein the sulfonated polymer is a polycarbonate homopolymer.
Claim 20
Dependent Claim
19 words
A method according to claim 18 wherein each of A 2 and A3 is p-phenylene and Y is isopropylidene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.