US4517341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyphenylene oxide-rubber graft copolymers and products obtained thereby
Assignee: General Electric Co
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Filing: 1983-10-24
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Granted: 1985-05-14
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Expires: 2003-10-24
Abstract
Abstract By synthesizing a polyphenylene oxide using a catalyst comprising a primary or secondary amine and/or a manganese compound, the same can be grafted to an unsaturated compound such as an unsaturated rubber at high yield. A process for so modifying an unsaturated compound such as an unsaturated rubber and the product obtained thereby are disclosed.
Inventors
- 👤 Dwain M. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:45
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/025
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
132 words
A process for producing a polyphenylene oxide-rubber graft copolymer which comprises the steps of: (A) forming a polyphenylene oxide by oxidative coupling of at least one phenol in the presence of a catalyst which includes at least one compound selected from the group consisting of primary and secondary amines, said compound producing grafting sites on said polyphenylene oxide; (B) intimately contacting said polyphenylene oxide having grafting sites with at least one unsaturated rubber which is free from any substantial amount of crosslinking; and subsequently (C) heating the resulting blend at a temperature of about 250°-350° C. and a pressure of about 1,000-20,000 psig for a time sufficient to form said graft copolymer; said polyphenylene oxide being maintained at a temperature substantially below its glass transition temperature at all times prior to grafting.
Claim 2
Dependent Claim
132 words
A process for producing a polyphenylene oxide-rubber graft copolymer which comprises the steps of: (A) forming a polyphenylene oxide by oxidative coupling of at least one phenol in the presence of a catalyst which includes at least one compound selected from the group consisting of primary and secondary amines, said compound producing grafting sites on said polyphenylene oxide; (B) intimately contacting said polyphenylene oxide having grafting sites with at least one unsaturated rubber which is free from any substantial amount of crosslinking; and subsequently (C) heating the resulting blend at a temperature of about 250°-350° C. and a pressure of about 1,000-20,000 psig for a time sufficient to form said graft copolymer; said polyphenylene oxide being maintained at a temperature substantially below its glass transition temperature at all times prior to grafting.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the rubber is an aliphatic rubber.
Claim 4
Dependent Claim
47 words
The process of claim 2 wherein said amine has the formula R--NH--R' wherein R is linear alkyl, branched alkyl, aralkyl or heteroalkyl, R' can be the same as R and in addition H and R and R' can combine to form a cycloalkyl, cycloaralkyl or cycloheteroalkyl group.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said amine is selected from group consisting of ethylamine, dimethylamine, dibenzylamine, methylethylamine, butylamine, ethylpropylamine, propylamine, dipropylamine, ethoxyethylamine, dibutylamine, diisopropylamine, dicyclohexylamine, morpholine, piperazine and piperidine.
Claim 6
Dependent Claim
20 words
The process of claim 4 wherein the rubber is one which is substantially soluble in aromatic and chlorinated aliphatic solvents.
Claim 7
Dependent Claim
25 words
The process of claim 5 wherein step B is effected by dissolving said polyphenylene oxide and rubber in a solvent and said solvent is removed.
Claim 8
Dependent Claim
20 words
The process of claim 6 wherein solvent removal in step B is effected by coprecipitation of the polyphenylene oxide-rubber blend.
Claim 9
Dependent Claim
22 words
The process of claim 4 wherein the rubber is selected from the group consisting of natural rubber, polyisoprene rubbers and polybutadiene rubbers.
Claim 10
Dependent Claim
34 words
The process of claim 8 wherein 100 parts of said blend contain about 5 to about 80 parts by weight of polyphenylene oxide and about 95 to about 20 parts by weight of rubber.
Claim 11
Dependent Claim
14 words
The process of claim 9 wherein the phenol used in step A is 2,6-dimethylphenol.
Claim 12
Dependent Claim
26 words
The process of claim 9 wherein the amine is used in step A in the amount of 0.005 mol to 0.02 mol per mol of phenol.
Claim 13
Dependent Claim
12 words
A polyphenylene oxide-rubber graft copolymer produced by the process of claim 1.
Claim 14
Dependent Claim
12 words
A polyphenylene oxide-rubber graft copolymer produced by the process of claim 3.
Claim 15
Dependent Claim
12 words
A polyphenylene oxide-rubber graft copolymer produced by the process of claim 5.
Claim 16
Dependent Claim
12 words
A polyphenylene oxide-rubber graft copolymer produced by the process of claim 8.
Claim 17
Dependent Claim
12 words
A polyphenylene oxide-rubber graft copolymer produced by the process of claim 10.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |