Patent US2489056A successfully refreshed from Google Patents.
US4097556A
Expired / Lapsed
US
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PPO-Graft copolymer and process for producing the same
Assignee: Asahi Kasei Corp
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Filing: 1977-02-07
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Granted: 1978-06-27
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Expires: 1997-02-07
Abstract
Abstract A graft copolymer having enhanced moldability with high mechanical strength capable of forming a molded article having excellent gloss, transparency and color is prepared by grafting styrene polymer segments formed under specific conditions selected onto the backbone polymer of polyphenylene ether. Said styrene polymer segments are formed by melting and kneading continuously a mixture of (a) polyphenylene ether expressed by the general formula of: ##STR1## WHEREIN R 1 and R 2 represent an alkyl group having 1-4 carbon atoms or a halogen atom, respectively, and n represents the degree of polymerization and is 90-250, (b) a styrene polymer containing at least 80 weight % of styrene units and (c) styrene-containing monomers in the presence of a radical initiator at a temperature in the range from 160° to 300° C thereby to complete graft polymerization within a time ranging from 0.5 to 15 minutes, preferably under uniform mechanical shearing stress throughout said mixture during graft polymerization.
Inventors
- 👤 Kunio Toyama
- 👤 Isamu Shimizu
- 👤 Takeo Imamura
- 👤 Atsuo Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:01
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02; C08F283/00; C08F283/06; C08F283/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
117 words
A graft copolymer comprising polyphenylene ether having styrene polymer segments grafted thereon improved in moldability, said styrene polymer segments being formed by melting and kneading continuously a mixture of (a) polyphenylene ether expressed by the general formula of: ##STR3## wherein R 1 and R 2 represent an alkyl group having 1-4 carbon atoms or a halogen atom, respectively, and n represents the degree of polymerization and is 90-250, (b) a styrene polymer containing at least 80 weight % of styrene units and (c) styrene-containing monomers in the presence of a radical initiator at a temperature in the range from 160° to 300° C thereby to complete graft polymerization within a time ranging from 0.5 to 15 minutes.
Claim 2
Dependent Claim
117 words
A graft copolymer comprising polyphenylene ether having styrene polymer segments grafted thereon improved in moldability, said styrene polymer segments being formed by melting and kneading continuously a mixture of (a) polyphenylene ether expressed by the general formula of: ##STR3## wherein R 1 and R 2 represent an alkyl group having 1-4 carbon atoms or a halogen atom, respectively, and n represents the degree of polymerization and is 90-250, (b) a styrene polymer containing at least 80 weight % of styrene units and (c) styrene-containing monomers in the presence of a radical initiator at a temperature in the range from 160° to 300° C thereby to complete graft polymerization within a time ranging from 0.5 to 15 minutes.
Claim 3
Dependent Claim
14 words
The graft copolymer according to claim 1 wherein the polyphenylene ether is poly(2,6-dimethyl-1,4-phenylene ether).
Claim 4
Dependent Claim
14 words
The graft copolymer of claim 2 wherein the polyphenylene ether employed is a homopolymer.
Claim 5
Dependent Claim
29 words
The graft copolymer according to claim 2 wherein the polyphenylene ether employed is in the form of particles of not over 2 mm or less in weight-average particle diameter.
Claim 6
Dependent Claim
14 words
The graft copolymer according to claim 3 wherein the styrene polymer is preformed polystyrene.
Claim 7
Dependent Claim
13 words
The graft copolymer according to claim 2 wherein the styrene polymer is polystyrene.
Claim 8
Dependent Claim
28 words
The graft copolymer according to claim 2 wherein the styrene polymer is styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, styrene-α-methylstyrene copolymer, styrene-chlorostyrene copolymer, styrene-maleic anhydride copolymer, or styrene-acrylonitrile-methyl methacrylate copolymer.
Claim 9
Dependent Claim
14 words
The graft copolymer according to claim 2 wherein the monomers (c) consist of styrene.
Claim 10
Dependent Claim
43 words
The graft copolymer according to claim 2 wherein the monomers (c) consist of a mixture of styrene and less than 10 weight % of one or two compounds selected from the group consisting of acrylonitrile, methyl methacrylate, α-methylstyrene, and chlorostyrene and maleic anhydride.
Claim 11
Dependent Claim
29 words
The graft copolymer according to claim 2 wherein when (a) is a copolymer, the copolymerizable units are units from an alkyl phenol, a dialkyl phenol or a trialkyl phenol.
Claim 12
Dependent Claim
15 words
The graft copolymer according to claim 1 wherein the styrene polymer is formed in situ.
Claim 13
Dependent Claim
12 words
A thermoplastic resinous composition comprising the graft copolymer according to claim 1.
Claim 14
Dependent Claim
24 words
The graft copolymer as in claim 1 wherein the polystyrene segments are formed while placing the mixture under uniform shearing stress throughout said mixture.
Claim 15
Dependent Claim
49 words
The graft copolymer as in claim 13 wherein the mixture is permitted to pass through a zone of which the length perpendicular to the surface strain for imposing shearing stress is as small as 1 to 50 mm under a shear rate of 10 sec 31 1 or over.
Claim 16
Dependent Claim
16 words
The graft copolymer as in claim 14 wherein the mixture is melted and kneaded by extrusion.
Claim 17
Dependent Claim
33 words
The graft copolymer as in claim 1 wherein 0.5 part to 5 parts of a radical initiator per 100 parts of the total of the polyphenylene ether and the styrene polymer is used.
Claim 18
Dependent Claim
51 words
The graft copolymer according to claim 1 wherein the graft copolymer is formed from a mixture of 3-30 parts by weight of styrene-containing monomers per 100 parts by weight of resin, said resin consisting of 60-90 weight % of the polyphenylene ether and 40-10 weight % of the preformed styrene polymer.
Claim 19
Dependent Claim
23 words
The graft copolymer of claim 17 wherein the styrene-containing monomers are 5-20 parts by weight per 100 parts by weight of said resin.
Claim 20
Dependent Claim
17 words
The process of claim 18 wherein the graft copolymer is formed in the substantial absence of solvent.
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |