Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-04-10
1999-08-17
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253337, 5253339, 5253341, 5253593, 525383, 525386, C08F 800
Patent
active
059394951
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing a polyolefin having a functional group at its terminal.
BACKGROUND ART
The polyolefin having a functional group at its terminal is advantageously used as, for example, a compatibilizer for a polymer blend, a paint coating property improver or a starting material in molecular designing. The conversion of a terminal group of the polyolefin to a functional group enables improving coating and adherence properties of the polyolefin.
For producing the above polyolefin having a functional group at its terminal, for example, a process using the living polymerization is described in Japanese Patent Laid-open Publication No. 63(1988)-113003. In this process, the polymerization step must be conducted at such low temperatures that the productivity is poor and high cost is inevitable in industrial mass production.
Moreover, Japanese Patent Laid-open Publication No. 2(1990)-218705 describes a process for producing a polyolefin having a functional group at its terminal being represented by the formula P-X wherein P is a polymer chain and X is a functional group, which process comprises step (a) preparing a terminal-modified polyolefin of the formula P-ZnRR' wherein P is as defined above and R and R' are hydrocarbon groups and step substituting the --ZnRR' with a functional group. However, the step (a) must be conducted at low temperatures, for example, about 15 to 25.degree. C., so that it is presumed that the productivity would be poor and high cost would be inevitable in industrial mass production.
The present invention has been made taking the above prior art into account, and the object of the present invention is to provide a process in which a polyolefin having a functional group at its terminal can be obtained with industrial advantages.
DISCLOSURE OF THE INVENTION
The process for producing a polyolefin having a functional group at its terminal according to the present invention comprises: copolymerization of an olefin of the formula CH.sub.2 .dbd.CHR.sup.3 in which R.sup.3 is a group or an atom selected from among hydrocarbon groups having 1 to 10 carbon atoms, a hydrogen atom and halogen atoms and each of R.sup.1 and R.sup.2 independently represents a group or an atom selected from among hydrocarbon groups having 1 to 10 carbon atoms, a hydrogen atom and halogen atoms, titanium catalyst component (a) including titanium, halogen and magnesium as essential components and an organoaluminum compound catalyst component (b) or an olefin polymerization catalyst composed of the above components (a) and (b) and an organosilicon compound (c); and copolymerization of an olefin of the formula CH.sub.2 .dbd.CHR.sup.3 in which R.sup.3 is a group or an atom selected from among hydrocarbon groups having 1 to 10 carbon atoms, a hydrogen atom and halogen atoms and X represents a functional group or a group having at least one functional group, the terminal-modified polyolefin obtained in the above step (A) and a compound having a functional group structure or by first conducting a substitution reaction between -AlR.sup.1 R.sup.2 group of the terminal-modified polyolefin obtained in the above step (A) and a compound having such a structure that a functional group is formed by solvolysis and thereafter conducting solvolysis.
The present invention enables producing the polyolefin having a functional group at its terminal by an industrially advantageous process.
In the present invention, it is preferred that, in the formula (I), P represent a polymer chain obtained by a homopolymerization or copolymerization of at least 20 olefin monomer units, especially, 50 to 10,000 olefin monomer units. Further, it is preferred that, in the step (A), an olefin be polymerized at 70.degree. C. or higher. Still further, it is preferred that, in the formula (II), X represent --COOR or --OR, each of these Rs being a hydrocarbon group having 1 to 10 carbon atoms or a hydrogen atom, or a halogen and that the polyolefin represented by the formula (II) have an Mw/Mn ratio of a
REFERENCES:
patent: 5185401 (1993-02-01), Rendina et al.
patent: 5247021 (1993-09-01), Fujisawa et al.
"Ziegler-Natta Catalysts and Polymerization",Boor, Jr.,Academic Press, Inc., New York, 1979,pp. 247-251, 1979.
Abstract of Japanese Laid-Open Patent Appln. No. 63-113003 (May, 18, 1988).
Abstract of Japanese Laid-Open Patent Appln. No. 2-218705 (Aug. 31, 1990).
Shiono, et al. "Synthesis of terminally halogenated isotactic poly(propylene)s using hydroalumination", Die Makromolekulare Chemie, Rapid Communications, 13 (1992) Aug., No. 8, pp. 371-376.
Kioka Mamoru
Kojo Shinichi
Lipman Bernard
Mitsui Chemicals Inc.
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