Patent US3404804A successfully refreshed from Google Patents.
US4448931A
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US
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Polyphenylene ether resin
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1982-04-16
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Granted: 1984-05-15
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Expires: 2002-04-16
Abstract
Abstract A resin composition comprising a polyphenylene ether resin and a rubber-modified polystyrene resin, wherein at least 80% of the rubber particles based on the total number of rubber particles in the elastomeric phase of the rubber-modified polystyrene resin have a particle diameter in the range of 0.5 to 4 microns, and the elastomeric phase has a particle size distribution index, SDI, defined by the equation ##EQU1## wherein x is the diameter in microns of the particles, and n is the number of particles having a particle diameter of x microns, of not more than 1.9.
Inventors
- 👤 Akitoshi Sugio
- 👤 Masanobu Masu
- 👤 Akikazu Amagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:16
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/04; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A resin composition comprising a polyphenylene ether resin and a rubber-modified polystyrene resin, wherein at least 80% of the rubber particles based on the total number of rubber particles in the elastomeric phase of the rubber-modified polystyrene resin have a particle diameter in the range of 0.5 to 4 microns, and the elastomeric phase has a particle size distribution index, SDI, defined by the equation ##EQU3## wherein x is the diameter in microns of the particles, and n is the number of particles having a particle diameter of x microns, of not more than 1.9.
Claim 2
Dependent Claim
95 words
A resin composition comprising a polyphenylene ether resin and a rubber-modified polystyrene resin, wherein at least 80% of the rubber particles based on the total number of rubber particles in the elastomeric phase of the rubber-modified polystyrene resin have a particle diameter in the range of 0.5 to 4 microns, and the elastomeric phase has a particle size distribution index, SDI, defined by the equation ##EQU3## wherein x is the diameter in microns of the particles, and n is the number of particles having a particle diameter of x microns, of not more than 1.9.
Claim 3
Dependent Claim
28 words
The composition of claim 1 wherein at least 90% of the rubber particles in the elastomeric phase have a diameter in the range of 0.5 to 4 microns.
Claim 4
Dependent Claim
20 words
The composition of claim 2 wherein the elastomeric phase has a particle size distribution index of not more than 1.5.
Claim 5
Dependent Claim
26 words
The resin composition of claim 1 wherein the rubber-modified polystyrene resin is a two-phase system resin composed of a polystyrene resin matrix and rubber dispersed therein.
Claim 6
Dependent Claim
61 words
The resin composition of claim 1 wherein the polystyrene resin is a homopolymer or copolymer containing at least 25% by weight of structural units of the formula ##STR5## wherein R 1 represents a hydrogen atom or a lower alkyl group, Z represents a halogen atom or a lower alkyl group, and p is 0 or an integer of 1 to 5.
Claim 7
Dependent Claim
57 words
The resin composition of claim 1 wherein the rubber-modified polystyrene resin is an interpolymer of a styrene monomer of the formula ##STR6## wherein R 1 represents a hydrogen atom or a lower alkyl group, Z represents a halogen atom or a lower alkyl group, and p is 0 or an integer of 1 to 5, with rubber.
Claim 8
Dependent Claim
16 words
The resin composition of claim 6 wherein the rubber is natural rubber or a synthetic rubber.
Claim 9
Dependent Claim
28 words
The resin composition of claim 6 wherein the synthetic rubber is a diene-type rubber, a copolymer of a diene monomer and a styrene monomer, or a monovinyl-type rubber.
Claim 10
Dependent Claim
60 words
The resin composition of claim 1 wherein the polyphenylene ether resin is a homopolymer or copolymer having at least 50 structural units represented by the formula ##STR7## wherein R 2 and R 3 represent an alkyl group having 1 to 3 carbon atoms, and R 4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
Claim 11
Dependent Claim
40 words
The resin composition of any one of claims 1 to 9 wherein the proportion of the polyphenylene ether resin is 10 to 90% by weight based on the total weight of the polyphenylene ether resin and the rubber-modified polystyrene resin.
Claim 12
Dependent Claim
35 words
The resin composition of claim 1 wherein the proportion of the polyphenylene ether resin is 25 to 75% by weight based on the total weight of the polyphenylene ether resin and the rubber-modified polystyrene resin.
Claim 13
Dependent Claim
20 words
The composition of claim 1 wherein the elastomeric phase has a particle size distribution index of not more than 1.5.
References Cited (Backward Citations)
US4128602A
Cited
US4128602B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |