Tonen Corporation

Toyota Jidosha Kabushiki Kaisha

Bridgestone Corporation

Tonen Chemical Corporation

Shigeyuki Toki

Yuji Fujita

Satoshi Ueki

Tetsuya Kawamura

Kouichi Yokoyama

Katsuyuki Yokomizo

Hiroyuki Furuhashi

Akira Kobayashi

Tatsuo Teraya

Eiji Kuchiki

Takao Nomura

Takeyoshi Nishio

Masahide Murata

Norio Inada

Isamu Imai

Toshihiro Yotsumoto

Maki Sato

Naomi Koyama

Kunio Iwanami

Ichiro Wada

Masatoshi Ohkura

Naohiro Mikawa

Tetsuya Morioka

A polypropylene resin composition including (A) 50-90 parts by weight of a polypropylene resin including (a) 3-30 weight % of stereoblock polypropylene having a weight-average molecular weight of 5,000-1,000,000, a percentage of five continuous propylene monomer units in which all propylene bonds are meso bonds and a percentage of five continuous propylene monomer units in which all propylene bonds are racemic bonds being 70% or more and 5% or more, respectively relative to the all propylene bonds, and (b) 70-97 weight % of an ultra-high stereospecific polypropylene having a melt flow rate of 0.1-1,000 g/10 minutes, an average meso chain length Nm calculated from a triad percentage determined from .sup.13 C-NMR spectrum by the following formula of Nm=2[mm]/[mr]+1, wherein [mm] is (isotactic triad/total triad).times.100 (%) and [mr] is (heterotactic triad/total triad).times.100 (%), meeting a relation of Nm&gt;250+29.5 log (MFR), and (B) 50-10 parts by weight of an olefinic rubber and/or a polyolefin other than (A).

Polypropylene resin composition

The thermoplastic resin composition of the present invention is made of:

Thermoplastic resin composition

An ethylene polymer which Is capable of being degraded by microorganisms is provided which comprises a recurring unit represented by the general formula ##STR1## in which R is a divalent hydrocarbon group containing 2 to 20 carbon atoms, R' is a divalent hydrocarbon group containing 1 to 20 carbon atoms and A is a polyethylene segment comprising a recurring unit represented by the formula --CH.sub.2.CH.sub.2 -- and having a number average molecular weight (Mn) of 300 to 300,000, and the ethylene polymer having a number average molecular weight (Mn) of 500 to 5,000,000.

Biodegradable ethylene polymer having ester bonds in the main chain and

A thermoplastic resin composition comprising (a) modified polyolefin produced by graft-polymerizing a polyolefin with a glycidyl compound represented by the following general formula: ##STR1## wherein R is a hydrogen atom or an alkyl group having 1-6 carbon atoms, Ar is an aromatic hydrocarbon group having 6-20 carbon atoms and containing at least one glycidyloxy group, and n is an integer of 1-4; and (b) a matrix polymer resin such as polyamide, polyester, polycarbonate etc.

Modified polyolefin-containing thermoplastic resin composition

Olefin polymerization catalyst

The modified polyolefin is produced by graft-polymerizing (a) 100 parts by weight of a polyolefin, with (b) 0.01-30 parts by weight of a glycidyl compound represented by the following general formula: ##STR1## wherein R is a hydrogen atom or an alkyl group having 1-6 carbon atoms, Ar is an aromatic hydrocarbon group having 6-20 carbon atoms and containing at least one glycidyloxy group, and n is an integer of 1-4. The glycidyl compound may be added stepwise to have a higher graft ratio. The modified polyolefin may be graft-copolymerized with polyesters at a high graft ratio.

Method of producing modified polyolefin

Rubber-reinforcing fiber cords are disclosed which are constituted by at least one kind of fibers selected from a group consisting of aromatic polyamide fibers, entire aromatic polyester fibers and polyvinylalcohol fibers having a tenacity of not less than 15 g/d. Spaces among filaments constituting the cord are each impreganted with a rubbery material. Radial tires are also disclosed which each comprise at least one pair of bead wires, at least one carcass ply cord layer and at least one belt ply cord layer. Carcass ply cords and/or belt ply cords are constituted by the above rubber-reinforcing fiber cords.

Heavy duty pneumatic radial tires using rubber reinforcing fiber cords

Growing community of inventors

Saitama, Japan

Shigeyuki Toki