Patent US5504373A successfully refreshed from Google Patents.
US4760118A
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Polyphenylene ether capped with salicylic acid ester
Assignee: General Electric Co
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Filing: 1987-03-23
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Granted: 1988-07-26
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Expires: 2007-03-23
Abstract
Abstract Polyphenylene ethers are capped by reaction in the melt with an ester of salicylic acid, anthranilic acid or a substituted derivative thereof; esters of salicylic acid, and especially salicylic carbonate and linear polysalicylates, are preferred. The capping reaction typically takes place at a temperature in the range of about 225°-325° C., employing about 5-12% by weight of the ester based on polyphenylene ether.
Inventors
- 👤 Dwain M. White
- 👤 Laura A. Socha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:41
CPC Classifications
C; C08; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/126; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; C08L67/00; C08L69/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
29 words
A method for capping a polyphenylene ether which comprises reacting said polyphenylene ether in the melt with at least one ester of salicylic acid or a substituted derivative thereof.
Claim 2
Independent Claim
29 words
A method for capping a polyphenylene ether which comprises reacting said polyphenylene ether in the melt with at least one ester of salicylic acid or a substituted derivative thereof.
Claim 3
Dependent Claim
80 words
A method according to claim 1 wherein the polyphenylene ether comprises a plurality of structural units having the formula ##STR14## and in each of said units independently, each Q 1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonoxy, or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms; and each Q 2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q 1 .
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein about 3-12% by weight of said ester is employed, based on polyphenylene ether.
Claim 5
Dependent Claim
32 words
A method according to claim 3 wherein each Q 1 is methyl, each Q 2 is hydrogen and the reaction is effected at a temperature in the range of about 225°-325° C.
Claim 6
Dependent Claim
25 words
A method according to claim 4 wherein the ester is an ester of salicylic acid and about 6-10% thereof is employed, based on polyphenylene ether.
Claim 7
Dependent Claim
29 words
A method according to claim 5 wherein the polyphenylene ether contains end groups having at least one of the formulas ##STR15## wherein each R 2 is methyl or n-butyl.
Claim 8
Dependent Claim
15 words
A method according to claim 5 wherein there is also present at least one polystyrene.
Claim 9
Dependent Claim
37 words
A method according to claim 5 wherein the ester has the formula ##STR16## wherein each R 3 is independently hydrogen or an aliphatic, alicyclic or aromatic hydrocarbon radical, at least one R 3 being other than hydrogen.
Claim 10
Dependent Claim
12 words
A method according to claim 8 wherein the ester is phenyl salicylate.
Claim 11
Dependent Claim
12 words
A method according to claim 8 wherein the ester is acetylsalicylic acid.
Claim 12
Dependent Claim
45 words
A method according to claim 5 wherein the ester has the formula ##STR17## wherein each Y is hydrogen or Si(R 4 ) 3 , at least one Y being Si(R 4 ) 3 , and each R 4 is independently a C 1-4 alkyl radical.
Claim 13
Dependent Claim
13 words
A method according to claim 5 wherein the ester has the formula ##STR18##
Claim 14
Dependent Claim
19 words
A method according to claim 5 wherein the ester has the formula ##STR19## wherein n is 2 or 3.
Claim 15
Dependent Claim
23 words
A method according to claim 5 wherein the ester is a linear polysalicylate of the formula ##STR20## wherein n is at least 2.
Claim 16
Dependent Claim
11 words
A capped polyphenylene ether prepared by the method of claim 1.
Claim 17
Dependent Claim
11 words
A capped polyphenylene ether prepared by the method of claim 6.
Claim 18
Dependent Claim
83 words
A capped polyphenylene ether composition which comprises polymer molecules having end groups of at least one of the formulas ##STR21## ##STR22## wherein A is an unsubstituted or substituted o-phenylene radical; each Q 1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonoxy, or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms; and each Q 2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q 1 .
Claim 19
Dependent Claim
83 words
A capped polyphenylene ether composition which comprises polymer molecules having end groups of at least one of the formulas ##STR21## ##STR22## wherein A is an unsubstituted or substituted o-phenylene radical; each Q 1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonoxy, or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms; and each Q 2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q 1 .
Claim 20
Dependent Claim
20 words
A composition according to claim 17 wherein the polyphenylene ether comprises a plurality of structural units having the formula ##STR23##
Claim 21
Dependent Claim
18 words
A composition according to claim 18 wherein each Q 1 is methyl and each Q 2 is hydrogen.
Claim 22
Dependent Claim
10 words
A composition according to claim 19 wherein A is unsubstituted.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |