Patent US4829125A successfully refreshed from Google Patents.
US4829125A
Expired / Lapsed
US
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Method of producing an olefin thermoplastic resin composition
Assignee: LG Corp
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Filing: 1988-05-23
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Granted: 1989-05-09
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Expires: 2008-05-23
Abstract
Abstract A given amount of crystalline polypropylene resin is blended with an olefin copolymer rubber to prepare a preblend comprising an olefin copolymer rubber/crystalline polypropylene and then the preblend is melt-blended with a crystalline polypropylene resin in the presence of peroxide. The present invention is based upon the fracture mechanism occurring between the crystalline polypropylene and rubber and is accomplished by the reciprocal combination of the reactions such as cross-linking reaction, random scission reaction of the polymer main chain, graft reaction and blocking reaction to form a cell structure. An object of the present invention is to provide a method which results in a product having better homogeneity, better heat-resistance, higher impact-resistance and greater flowabilty than heretofore known methods of preparation.
Inventors
- 👤 Jong K. Yeo
- 👤 Jong M. Oh
- 👤 Suk K. Chang
- 👤 Eon S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; C08K; C08K5/00; C08K5/04; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/16; C08J2323/00; C08J2323/02; C08L23/12; C08L23/14; C08L23/142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A method of producing an olefin thermoplastic resin composition, which comprises blending an olefin copolymer rubber and a crystalline polypropylene in the ratio of 1:0.01-0.5 to prepare a preblend in which the crystalline polypropylene is dispersed into the olefin copolymer rubber and then melt blending 10-75 parts by weight of said preblend and 90-25 parts by weight of the crystalline polypropylene in the presence of an organic peroxide in a blending extruder.
Claim 2
Independent Claim
72 words
A method of producing an olefin thermoplastic resin composition, which comprises blending an olefin copolymer rubber and a crystalline polypropylene in the ratio of 1:0.01-0.5 to prepare a preblend in which the crystalline polypropylene is dispersed into the olefin copolymer rubber and then melt blending 10-75 parts by weight of said preblend and 90-25 parts by weight of the crystalline polypropylene in the presence of an organic peroxide in a blending extruder.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein said olefin copolymer rubber is an ethylene-propylene copolymer rubber or ethylene-propylene-non-conjugated diene rubber.
Claim 4
Dependent Claim
19 words
A method according to claim 2, wherein said non-conjugated diene is dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylidene norbornene or ethylidene norbornene.
Claim 5
Dependent Claim
19 words
A method according to claim 1, wherein said crystalline polypropylene is a homopolymer or copolymer with an α-olefin monomer.
Claim 6
Dependent Claim
17 words
A method according to claim 4, wherein said α-olefin monomer is ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene or 1-hexene.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said crystalline polypropylene is isotactic polypropylene or an ethylene-propylene random copolymer.
Claim 8
Dependent Claim
29 words
A method according to claim 1, wherein said organic peroxide is dicumyl peroxide, di-tert-butyl peroxide, 1,3-bis(tert-butyl peroxy isopropyl) benzene, 2,5-dimethyl-2,5-di(tert-butyl peroxide) hexane, benzoyl peroxide, p-chlorobenzoyl peroxide or 2,4-dichlorobenzoyl peroxide.
Claim 9
Dependent Claim
13 words
A method according to claim 1, wherein said preblend is a pellet form.
Claim 10
Dependent Claim
18 words
A method according to claim 1, wherein said blending extruder is Banbury Kneader, Twin screw extruder or Co-kneader.
Claim 11
Dependent Claim
18 words
A method according to claim 4, wherein said crystalline polypropylene is isotactic polypropylene or an ethylene-propylene random copolymer.
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |