Mitsui Chemicals, Inc.

Mitsu Chemicals, Inc.

Kenichi Morizono

Keiji Okada

Masayoshi Yamaguchi

Toshiyuki Tsutsui

Hideki Sakai

Kazuyuki Takimoto

Hideo Toyoda

Masaaki Kawasaki

Terunori Fujita

Makoto Mitani

Junji Saito

Tetsuo Tojo

Masahide Tanaka

Ryoji Mori

Hideshi Kawachi

Tetsuhiro Matsumoto

Suguru Tokita

Ryousuke Kaneshige

Hideki Hirano

Kazuyoshi Kaneko

Hiromi Shigemoto

The present invention is intended to provide a soft syndiotactic polypropylene composition having a good balance of properties such as transparency, flexibility and heat resistance and a laminate having a layer comprising the composition and a layer comprising a thermoplastic resin. The composition (1) comprises a syndiotactic propylene polymer (A), an &agr;-olefin polymer (B), and a small amount of a crystal nucleating agent (C) and/or an ethylene-based polymer (D). The composition (2) comprises a syndiotactic propylene polymer (A), an &agr;-olefin polymer (B), an isotactic propylene polymer (E), and a small amount of a crystal nucleating agent (C) and/or an ethylene-based polymer (D). The composition (3) comprises a syndiotactic propylene polymer (A), an &agr;-olefin polymer (B), an isotactic propylene polymer (E), a copolymer (F) of polar group-containing vinyl and ethylene, and a small amount of an ethylene-based polymer (D).

Soft syndiotactic polypropylene composition and molded product

The present invention is intended to provide an ethylene copolymer having excellent mechanical properties and moldability, a process for preparing the copolymer, a resin composition containing the copolymer and uses thereof. The ethylene copolymer has the following properties: the copolymer comprises 90 to 99% by mol of ethylene constituent units and 1 to 60% by mol of C &agr;-olefin constituent units; the ratio (Mz/Mw) of a Z average molecular weight (Mz) to a weight-average molecular weight (Mw), each molecular weight being measured by GPC, is in the range of 10 to 30, and said ratio (Mz/Mw) and the ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn), each molecular weight being measured by GPC, satisfy the relation (Mz/Mw)>(Mw/Mn); the intrinsic viscosity is in the range of 0.5 to 9 dl/g; the ratio (n* /n* ) of a melt viscosity (&eegr;* ) at a shear rate of 0.01 rad/sec, as measured at 190&deg; C., to a melt viscosity (&eegr;* ) at a shear rate of 8 rad/sec, as measured at 190&deg; C., and the intrinsic viscosity (&eegr;) satisfy the relation (&eegr;* /&eegr;* )&gE;0.893&times;(&eegr;)&plus;1.0; and the absolute value of an activation energy (E ) of a shift factor of melt viscoelasticity is not more than 4&times;10 J/mol.K.

Ethylene copolymer and process for producing the same, resin composition containing the copolymer, and uses of these

Unsaturated copolymer which is a copolymer of an &agr;olefin of 2 to 12 carbon atoms and a conjugated diene monomer represented by the following formula (I-a) and has the properties: (a) in said copolymer, 1,2-addition units (including 3,4-addition units) derived from the conjugated diene monomer (I-a) form double bonds in the side chain of the copolymer, 1,4-addition units derived from the conjugated diene monomer (I-a) form double bonds in the main chain of the copolymer, and the quantity ratio of the double bonds of the side chain derived from the 1,2-addition units to the double bonds of the main chain derived from the 1,4-addition units (side chain double bonds derived from 1,2-addition units/main chain double bonds derived from 1,4-addition units) is in the range of 10/90 to 99/1 (b) five-membered rings are present in the main chain of said copolymer; and (c) the quantity ratio of the double bonds from all of the addition units to the five-membered rings (total of double bonds from all addition units/five-membered rings) is in the range of 20/80 to 90/10;

Unsaturated copolymers, processes for preparing the same, and compositions containing the same

A rubber composition useful as a tire side wall or tire tread is formed from an unsaturated olefin copolymer (A) or (A&prime;) and diene rubber (B). Copolymers (A) and (A&prime;) are each obtained from (i) ethylene, (ii) aromatic vinyl compound, (iii) non-conjugated polyene, and, optionally (iv) alpha-olefin having at least 3 carbon atoms. When used in forming a tire side wall, copolymer (A) has a molar ratio of (i)/(iv) from 100/0 to 40/60; molar ratio of &lsqb;((i)&plus;(iv))/(ii)&rsqb; from 98/2 to 60/40; an intrinsic viscosity, measured in decalin, at 135&deg; C., from 1.0 to 6.0 dl/g; and iodine value from 10 to 50. For use in tire tread, copolymer (A&prime;), has a molar ratio (i)/(iv) from 100/0 to 40/60; molar ratio &lsqb;((i)&plus;(iv)):(ii)&rsqb; from 99/1 to 85/15. The weight ratio (A&prime;)/(B) is from 1/99 to 50/50. The compositions for tire side wall are characterized by excellent strength properties and bending fatigue resistance and low fuel consumption. The compositions for tire tread are characterized by superior strength properties, abrasion resistance and braking performance on wet road (wet ski resistance) and small rolling resistance.

Rubber compositions for tires

A hot melt adhesive composition exhibiting excellent adhesive strength and which is useful as an adhesive for styrene resins contains (B) tackifier and (C) ethylene/C,-C,&agr;-olefin/aromatic vinyl compound random copolymer and, in some embodiments also (A) base polymer, such as polyolefin, polar group-containing polymer and aromatic vinyl compound/conjugated diene copolymer. A low molecular weight polyolefin may also be included in all embodiments. The randon copolymer (C) may be prepared by polymerizing the &agr;-olefin and aromatic vinyl compound in the presence of a metallocene containing catalyst. In addition to excellent adhesive strength the hot melt adhesives have improved workability.

Hot melt adhesive composition containing &agr;-olefin/aromatic vinyl compound random copolymer

Disclosed is an unsaturated elastomer composition comprising (A) an unsaturated olefin copolymer of at least one &agr;-olefin of 2 to 20 carbon atoms, a conjugated diene monomer represented by the following formula (I), and optionally, an aromatic vinyl compound, and (B) at least one rubber selected from a diene rubber and an ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber, a weight ratio of said component (A) to said component (B) ((A)/(B)) being in the range of 1/99 to 99/1;

Unsaturated elastomer compositions and their vulcanized rubbers

The present invention is directed towards a lubricating oil comprising a random copolymer of an &agr;-olefin/aromatic vinyl compound, wherein the copolymer has a viscosity falling within a specific range and comprises ethylene, an aromatic vinyl compound, and optionally an &agr;-olefin. The lubricating oil possesses excellent viscosity properties, thermal stability, oxidation stability, abrasion resistance, and compatibility with lubricating oil additives. The random copolymer having a different viscosity range is useful as a viscosity index improver and a compatibilizing agent for a lubricating oil. The invention also provides a lubricating oil composition comprising a base oil and the viscosity index improver or the compatibilizing agent. The invention further provides a fuel oil composition comprising a fuel oil fluidity improver based on the above random copolymer having a different viscosity range and a middle fraction fuel oil having a boiling point of 150 to 400&deg; C. The fuel oil composition prevents an increase in viscosity of the middle fraction fuel oil, lowers the clogging point and the flow point in a low-temperature filter, and inhibits the abrasion of a fuel jet nozzle.

Lubricating oil or lubricating oil composition and fuel oil composition

Heat-fixable developer for electrophotography

Disclosed herein is an olefin copolymer shrink film comprising an &agr;-olefin/aromatic vinyl compound random copolymer. This &agr;-olefin/aromatic vinyl compound random copolymer comprises 99.9 to 58 mol % of structural units derived from ethylene, 0 to 30 mol % of structural units derived from an &agr;-olefin having 3 to 20 carbon atoms (provided that the total of the structural units derived from ethylene and the structural units derived from an &agr;-olefin having 3 to 20 carbon atoms ranges from 99.9 to 88 mol %), and 0.1 to 12 mol % of structural units derived from an aromatic vinyl compound. The &agr;-olefin/aromatic vinyl compound random copolymer has an intrinsic viscosity &lsqb;&eegr;&rsqb;, as measured in decalin at 135&deg; C., of 0.1 to 10 dl/g and has a melting point, as measured by a differential scanning calorimeter, of 60 to 125&deg; C. The olefin copolymer shrink film is oriented in at least one direction. The olefin copolymer shrink film has excellent low-temperature shrinkability and transparency.

Olefin copolymer shrink film

Disclosed is an olefin thermoplastic elastomer composition obtained by dynamically heat treating, in the presence of an organic peroxide, a blend comprising 10 to 60 parts by weight of a crystalline polyolefin resin (A) and 40 to 90 parts by weight of an unsaturated olefin copolymer (B) of at least one .alpha.-olefin of 2 to 20 carbon atoms, a conjugated diene monomer represented by the following formula (I), and optionally, an aromatic vinyl compound, the total amount of said components (A) and (B) being 100 parts by weight; ##STR1## wherein R.sup.1 and R.sup.2 are each independently a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group, and at least one of R.sup.1 and R.sup.2 is a hydrogen atom. The composition has excellent moldability and can provide a molded product having excellent elastomeric properties, tensile strength properties and appearance.

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Waki-cho, Japan

Kenichi Morizono