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US5037890A
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Process for producing graft-modified α-olefin copolymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-10-28
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Granted: 1991-08-06
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Expires: 2008-10-28
Abstract
Abstract A copolymer of an α-olefin with an aromatic diolefin such as divinylbenzene produced by means of Ziegler-Natta polymerization and having a vinylphenyl moiety is subjected to polymerization with an ethylenically unsaturated monomer by means of anion polymerization or free radical polymerization, whereby a graft-modified α-olefin copolymer is obtained.
Inventors
- 👤 Masuzo Yokoyama
- 👤 Shinichi Yamauchi
- 👤 Hiroshi Nakano
- 👤 Michiharu Kihira
- 👤 Hiroshi Omori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
C; C08; C08F; C08F255/00; C08F257/00; C08F257/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A process for producing a graft-modified α-olefin copolymer, which comprises the following step (a) and step (b): Step (a): the step of copolymerizing with the use of a Ziegler-Natta catalyst on an α-olefin having 2 to 20 carbon atoms with a dialkenylbenzene represented by the formula: ##STR7## Wherein, R 1 represents a methyl group or a hydrogen atom, R 2 represents a hydrocarbyl group having 1 to 6 carbon atoms and n represents 0 or 1; and Step (b): the step of graft-polymerizing by a radical polymerization a radical polymerizable monomer onto said olefin copolymer obtained in the step (a); thereby to produce a graft-modified α-olefin copolymer having a gel content of 5% or less, the gel content being determined by a method wherein the graft-modified olefin copolymer is subjected, after bromine is added to it to saturate the unreacted alkenyl groups not used for the graft reaction, to the Soxhlet's extraction by use of xylene, and the residual amount after extraction is defined as the gel content.
Claim 2
Dependent Claim
168 words
A process for producing a graft-modified α-olefin copolymer, which comprises the following step (a) and step (b): Step (a): the step of copolymerizing with the use of a Ziegler-Natta catalyst on an α-olefin having 2 to 20 carbon atoms with a dialkenylbenzene represented by the formula: ##STR7## Wherein, R 1 represents a methyl group or a hydrogen atom, R 2 represents a hydrocarbyl group having 1 to 6 carbon atoms and n represents 0 or 1; and Step (b): the step of graft-polymerizing by a radical polymerization a radical polymerizable monomer onto said olefin copolymer obtained in the step (a); thereby to produce a graft-modified α-olefin copolymer having a gel content of 5% or less, the gel content being determined by a method wherein the graft-modified olefin copolymer is subjected, after bromine is added to it to saturate the unreacted alkenyl groups not used for the graft reaction, to the Soxhlet's extraction by use of xylene, and the residual amount after extraction is defined as the gel content.
Claim 3
Dependent Claim
22 words
The process according to claim 1, wherein the α-olefin is a straight or branched aliphatic α-olefin having 2 to 8 carbon atoms.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein the dialkenylbenzene is selected from the group consisting of divinylbenzene, isopropenylstyrene, divinyltoluene and divinylnaphthalene.
Claim 5
Dependent Claim
43 words
The process according to claim 1, wherein the Ziegler-Natta catalyst comprises a compound of a metal of the groups IV to VI of the Periodic Table and an organometallic compound of a metal of the groups I to III of the Periodic Table.
Claim 6
Dependent Claim
27 words
The process according to claim 4, wherein the compound of a metal of the groups IV to VI of the Periodic Table is a compound of titanium.
Claim 7
Dependent Claim
22 words
The process according to claim 1, wherein the organometallic compound is selected from organometallic compounds of lithium and organometallic compounds of aluminum.
Claim 8
Dependent Claim
25 words
The process according to claim 1, wherein a copolymer with a dialkenylbenzene content of 0.001 to 10% by weight is obtained by the step (a).
Claim 9
Dependent Claim
54 words
The process according to claim 1, wherein the monomer used in the step (b) is selected from the group consisting of C 1 -C 10 alkyl esters of acrylic acid or methacrylic acid, styrenes which may or may not have a lower alkyl substituent on the nucleus or in the side chain, and vinylsilanes.
References Cited (Backward Citations)
US3435096A
Cited
DE2656231A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |