Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ethylenically unsaturated reactant admixed with a preformed...
Reexamination Certificate
2002-05-10
2004-06-22
Acquah, Samuel A. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ethylenically unsaturated reactant admixed with a preformed...
C525S010000, C525S055000, C525S063000, C525S064000, C525S069000, C525S070000, C525S071000, C525S074000, C525S075000, C525S078000, C525S088000
Reexamination Certificate
active
06753378
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a branched polyolefin wherein at least one olefin chain is linked to a position other than both ends of another olefin chain having an olefin composition which is the same as or different from that of the previous olefin chain, and relates to a process for preparing the branched polyolefin and a thermoplastic resin composition containing the branched polyolefin.
BACKGROUND OF THE INVENTION
Since polyolefins have excellent processability, chemical resistance, electrical properties and mechanical properties, they are processed into extruded articles, injection molded articles, blow molded articles, films, sheets, etc., and applied to various uses.
In recent years, property requirements for polyolefins have been diversified, and polyolefins of various properties, e.g., polyolefins of excellent heat resistance and polyolefins having soft touch such as non-rigid polyvinyl chloride, are desired.
As methods to improve the properties of polyolefins, there are a method of controlling the type of a monomer or the molar ratio between monomers, a method of changing monomer arrangement, such as random or block arrangement, etc., and various methods have been attempted heretofore.
It is generally known that with respect to polyolefins containing ethylene as a main component, the polymer of a branched structure exhibits specific melt properties and is advantageous in the polymer molding. On this account, with respect to polyolefins containing an olefin of 3 or more carbon atoms as a main component, also the polymer of a branched structure is expected to have specific melt properties. When the composition of the olefin chain of the main chain is different from that of the olefin chain of the side chain, the polymer is also expected to function as a compatibilizing agent.
Under such circumstances as described above, the present inventors have studied, and as a result the inventors have found that a branched polyolefin wherein at least one olefin chain obtained from an olefin of 2 to 20 carbon atoms is linked to a position other than both ends of another olefin chain having an olefin composition which is the same as or different from that of the previous olefin chain has various excellent properties. Based on the finding, the present invention has been accomplished.
That is to say, it is an object of the present invention to provide a branched polyolefin having various excellent properties and a process for preparing the same. It is another object of the invention to provide a thermoplastic resin composition containing the branched polyolefin.
DISCLOSURE OF THE INVENTION
The branched polyolefin of the invention is a branched polyolefin comprising an olefin chain (A) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms and olefin chain(s) (B) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms and having an olefin composition which is the same as or different from that of the olefin chain (A), wherein the olefin chain (B) is linked to a position other than both ends of the olefin chain (A) through a bond having a carbonyl group, and at least one olefin chain (B) per one olefin chain (A) is present.
The branched polyolefin of the invention is, for example,
a polyolefin wherein the weight-average molecular weight (Mw) of the olefin chain (B) is not less than 5,000,
a polyolefin wherein the bond having a carbonyl group is an ester bond and/or an amide bond,
a polyolefin wherein one of the olefin chain (A) and the olefin chain (B) is a crystalline polyolefin and the other is a non-crystalline polyolefin,
a polyolefin wherein both the olefin chain (A) and the olefin chain (B) are polypropylene, or
a polyolefin wherein both the olefin chain (A) and the olefin chain (B) have stereoregularity.
The process for preparing a branched polyolefin of the invention comprises allowing a functional group-containing polyolefin (C) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms and having one or more carboxyl groups and/or acid anhydride groups at positions other than both ends to react with a terminal modified polyolefin (D) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms, having an olefin composition which is the same as or different from that of the functional group-containing polyolefin (C) and having at least one group capable of reacting with a carboxyl group or an acid anhydride group at only the position of chain end to prepare the above-mentioned branched polyolefin.
The process for preparing a branched polyolefin of the invention is, for example,
a process wherein the functional group-containing polyolefin (C) is a maleic anhydride-modified homopolymer or copolymer of ethylene and/or propylene,
a process wherein the terminal modified polyolefin (D) is a one-side-end modified polyolefin having a group capable of reacting with a carboxyl group or an acid anhydride group at only one-side-end, or
a process wherein the terminal modified polyolefin (D) is a maleic anhydride-modified homopolymer or copolymer of ethylene and/or propylene.
The thermoplastic resin composition of the invention contains the above-mentioned branched polyolefin in a content of 0.01 to 50% by weight.
PREFERRED EMBODIMENTS OF THE INVENTION
The branched polyolefin of the invention, the process for preparing the same and the thermoplastic resin composition containing the branched polyolefin are described in detail hereinafter.
The branched polyolefin of the invention comprises an olefin chain (A) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms and olefin chain(s) (B) having, as main constituent units, recurring units obtained from at least one olefin selected from olefins of 2 to 20 carbon atoms and having an olefin composition which is the same as or different from that of the olefin chain (A), and the olefin chain (B) is linked to a position other than both ends of the olefin chain (A) through a bond having a carbonyl group.
The meaning of the expression “composition is the same” is as follows. When the olefin chain (A) is for example a homopolymer, the olefin chain (B) is a homopolymer composed of the same olefin as that of the olefin chain (A), and when the olefin chain (A) is for example a copolymer, the olefin chain (B) is a copolymer composed of the same combination of olefins as that of the olefin chain (A) and having almost the same comonomer content as that of the olefin chain (A). The meaning of the expression “composition is different” is as follows. At least one condition selected from the monomer type for forming the olefin chain, the comonomer type and the comonomer content is different. In the present invention, it is preferable that the composition is different.
The composition of the olefin chain (A) and the composition of the olefin chain (B) do not include the bond having a carbonyl group for linking the olefin chain (A) to the olefin chain (B).
The olefin of 2 to 20 carbon atoms is, for example, a straight-chain or branched &agr;-olefin or a cycloolefin.
Examples of the straight-chain &agr;-olefins include those of 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms, such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicosene.
Examples of the branched &agr;-olefins include those of 4 to 20 carbon atoms, preferably 5 to 10 carbon atoms, such as 3-methyl-1-butene, 4-methyl-1-pentene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4,4-dimethyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4-ethyl-1-hexene and 3-ethyl-1-hexene.
Examples of the cycloolefins include those of 3 to 20 carbon atoms, preferably 3 to 10 carbon atoms, such as cyclopentene, cycloheptene, norbornene, 5-met
Kashiwa Norio
Kojoh Shin-ichi
Matsugi Tomoaki
Acquah Samuel A.
Birch & Stewart Kolasch & Birch, LLP
Mitsui Chemicals Inc.
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