Toyota Jidosha Kabushiki Kaisha

Tonen Chemical Corporation

Sho-bond Construction Co., Ltd.

Masatoshi Ohkura

Akihiro Yamaguchi

Takao Nomura

Takeyoshi Nishio

Satoshi Ueki

Shigeyuki Toki

Kunio Iwanami

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 pressure to the cracks in the concrete building and the like exerted by a binding material supplied thereinto is buffered by the expansion of a pressure buffering portion located somewhere between the supply pump and the supply pipe and after the supply pump is disconnected, the binding material supplying operation is succeeded by the pressure buffering portion which, having therein reserved the binding material by expansion, forces the binding material out into the cracks by contraction.

Method of filling a crack in concrete

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Tokyo, Japan

Masatoshi Ohkura