US4824887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impact rubber modified polystyrene and polyphenylene ether resins containing the same
Assignee: General Electric Co
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Filing: 1986-12-19
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Granted: 1989-04-25
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Expires: 2006-12-19
Abstract
Abstract Disclosed are thermoplastic compositions of improved mold flow comprising a polyphenylene ether resin and novel rubber modified polystyrenes containing dispersed rubbery particles having a maximum mean diameter of about 2.0 microns and a ratio of the volume average particle size/number average particle size of from not substantially less than 2.00 up to 3.20. Articles molded from the composition have vastly improved surface gloss and ductile impact strength in comparison with conventional polyphenylene/high impact rubber modified polystyrene compositions.
Inventors
- 👤 David F. Aycock
- 👤 Peter H. Shu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/04; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; C08L69/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
45 words
A thermoplastic composition comprising: (a) a polyphenylene ether resin; and (b) a rubber modified polystyrene containing dispersed rubbery particles having a maximum mean diameter of about 2.0 microns and a ratio of the volume average particle size/number average particle size of 2.00 to about 3.20.
Claim 2
Dependent Claim
45 words
A thermoplastic composition comprising: (a) a polyphenylene ether resin; and (b) a rubber modified polystyrene containing dispersed rubbery particles having a maximum mean diameter of about 2.0 microns and a ratio of the volume average particle size/number average particle size of 2.00 to about 3.20.
Claim 3
Dependent Claim
24 words
The thermoplastic composition of claim 1 wherein the ratio of the volume average particle size/number average particle size is about 2.75 to about 3.00.
Claim 4
Dependent Claim
21 words
The thermoplastic composition of claim 1 wherein the volume average particle size of the rubber particles is up to 2.0 microns.
Claim 5
Dependent Claim
27 words
The thermoplastic composition of claim 1 wherein the rubber modified polystyrene has a ratio of weight average molecular weight/number average molecular weight of at least about 2.5.
Claim 6
Dependent Claim
18 words
The thermoplastic composition of claim 1 wherein the composition has a swell index of less than about 11.0.
Claim 7
Dependent Claim
18 words
The thermoplastic composition of claim 1 wherein the composition has a gel concentration of greater than about 19%.
Claim 8
Dependent Claim
107 words
The thermoplastic composition of claim 1, wherein polyphenylene ether resin (a) is a homopolymer or copolymer containing structural units of the formula ##STR6## in which for each of these units independently each Q 1 is hydrogen, halogen, primary or secondary lower alkyl having up to seven carbon atoms, phenyl, haloalkyl or aminoalkyl wherein at least two carbon atoms separate the halogen or nitrogen atom from the benzene ring, 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 9
Dependent Claim
13 words
The thermoplastic composition of claim 1, wherein polyphenylene ether resin is poly(2,6-dimethyl-1,4-phenylene ether).
Claim 10
Dependent Claim
29 words
The thermoplastic composition of claim 8, wherein the poly(2,6-dimethyl-1,4-phenylene ether) has an intrinsic viscosity of from about 0.4 to about 0.5 deciliters per gram in chloroform at 25° C.
Claim 11
Dependent Claim
14 words
The thermoplastic composition of claim 1, wherein polyphenylene ether resin (a) is poly(2,6-dimethyl-co-2,3,6-trimethyl-1,4-phenylene ether).
Claim 12
Dependent Claim
33 words
The thermoplstic composition of claim 1 wherein the polyphenylene ether resin is present in an amount of from about 10 to about 90% by weight based on the overall weight of the composition.
Claim 13
Dependent Claim
32 words
The thermoplastic composition of claim 11 wherein the polyphenylene ether resin is present in an amount of from about 20 to 80% by weight based on the overall weight of the composition.
Claim 14
Dependent Claim
37 words
The thermoplastic composition of claim 12 wherein the polyphenylene ether resin is present in an amount of from about 50 to about 80 parts and the polystyrene is present in an amount of 20 to about 50.
Claim 15
Dependent Claim
16 words
The thermoplastic composition of claim 1 wherein the rubber of the rubber modified polystyrene is polybutadiene.
Claim 16
Dependent Claim
80 words
The thermoplastic composition of claim 1 wherein the styrene resin has at least 25% by weight of polymer units derived from a compound having the formula ##STR7## wherein R 1 and R 2 are selected from lower alkyl or alkenyl groups having 1 to 6 carbon atoms and hydrogen; and R 3 , R 4 , R 5 and R 6 are selected from chloro, bromo, hydrogen and lower alkyl or alkenyl groups having from 1 to 6 carbon atoms.
Claim 17
Dependent Claim
18 words
The thermoplastic composition of claim 1 further comprising a flame retardant effective amount of a flame retardant agent.
Claim 18
Dependent Claim
31 words
The thermoplastic compositions of claim 16 wherein the flame retardant agent comprises an aromatic phosphate, a halogenated vinyl aromatic polymer, a halogenated polycarbonate or a mixture of any of the foregoing.
Claim 19
Dependent Claim
56 words
The thermoplastic composition of claim 1 wherein component (b) has a number molecular weight of about 61,000, a weight average molecular weight of about 195,000, a number average rubber particle size of about 0.60, a volume average rubber particle size of about 1.60, a swell index of about 9.9 and a gel content of about 21.3%.
Claim 20
Dependent Claim
10 words
A shaped article produced from the composition of claim 1.
Claim 21
Dependent Claim
32 words
A thermoplastic composition of claim 12 wherein the polyphenylene ether is present in an amount of from about 40% to about 59% by weight based upon the overall weight of the composition.
Claim 22
Dependent Claim
21 words
A thermoplastic composition of claim 2 wherein the ratio of the volume average particle size/number average particle size is about 2.86.
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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |