US4746482A
Expired / Lapsed
US
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Method for the manufacture of a thermoplastic molding material containing polyphenylene ether
Assignee: Huels AG
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Filing: 1986-12-29
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Granted: 1988-05-24
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Expires: 2006-12-29
Abstract
Abstract The invention relates to a method for the manufacture of molding materials containing polyphenylene ether (PPE) and to the materials obtained according to this method. Molten PPE containing at least 0.1% volatile components is degasified until it reaches a residual content of volatile components of less than 500 ppm. Subsequently, additional molten polymers and/or additives are added to this molten mass at the lowest possible temperature and both components are mixed.
Inventors
- 👤 Wilfried Ribbing
- 👤 Hans Jadamus
- 👤 Hans-Eberhard von Portatius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/40; B29C48/50; B29C48/505; B29C48/57; B29C48/78; B29C48/80; B29C48/83; B29C48/832; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; C08L65/00; C08L77/00; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
A method for the manufacture of molding materials containing polyphenylene ether, comprising the steps of: (i) degasifying molten polyphenylene ether for a period of time from about 0.1 to about 3 minutes in a temperature range from about 290°-370° C.; (ii) adding at least one additional molten polymer to said degasified molten polyphenylene ether; and (iii) blending said degasified molten polyphenylene ether and said addittional molten polymer, wherein the residual content of volatile components in said degasified molten polyphenylene ether is less than 500 ppm.
Claim 2
Independent Claim
85 words
A method for the manufacture of molding materials containing polyphenylene ether, comprising the steps of: (i) degasifying molten polyphenylene ether for a period of time from about 0.1 to about 3 minutes in a temperature range from about 290°-370° C.; (ii) adding at least one additional molten polymer to said degasified molten polyphenylene ether; and (iii) blending said degasified molten polyphenylene ether and said addittional molten polymer, wherein the residual content of volatile components in said degasified molten polyphenylene ether is less than 500 ppm.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein said degasifying, adding and blending steps are performed in a forced conveyor.
Claim 4
Dependent Claim
13 words
The method of claim 2, wherein said forced conveyor is a double-screw kneader.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein X is the ratio between the viscosities of said degasified molten polyphenylene ether and said additional molten polymer and wherein 0.5>X>2.0.
Claim 6
Dependent Claim
7 words
The method of claim 4, wherein 0.8>X>1.2.
Claim 7
Dependent Claim
26 words
The method of claim 1, wherein said additional molten polymer contains additives selected from the group consisting of pigments, reinforcing materials and esters of phosphoric acid.
Claim 8
Dependent Claim
21 words
A molding material comprising polyphenylene ether and comprising less than 500 ppm volatile components, obtained by the method of claim 1.
Claim 9
Dependent Claim
17 words
The method of claim 1, wherein said temperature range is from about 320° to about 350° C.
Claim 10
Dependent Claim
19 words
The method of claim 1, wherein said additional polymer has a content of volatile components less than 200 ppm.
Claim 11
Dependent Claim
17 words
The method of claim 1, wherein the temperature of said blending step does not exceed 285° C.
Claim 12
Dependent Claim
13 words
The method of claim 10, wherein said temperature does not exceed 260° C.
Claim 13
Dependent Claim
16 words
The method of claim 1, wherein said molten polyphenylene ether comprises at least 0.1% volatile components.
Claim 14
Dependent Claim
14 words
The molding material of claim 7, further comprising less than 250 ppm volatile components.
References Cited (Backward Citations)
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |