Kuraray Co., Ltd.

Yu Nozasa

Yosuke Uehara

Satoshi Motoda

Yoshikazu Ueno

Masahiro Kashioka

Shuhei Kaneko

A modified liquid diene rubber (A) has a functional group (a) derived from an acid anhydride, and satisfies all the requirements (I) to (III) below: (I) The functional group equivalent weight of the functional groups (a) is in the range of 400 to 3,500 g/eq. (II) The polystyrene-equivalent number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is in the range of 5,000 to 20,000. (III) The melt viscosity at 38&#xb0; C. is not less than 3 Pa&#xb7;s and X (K) is not less than 6100 K wherein X is the slope of a linear line passing through two points in a graph in which the two points are values of melt viscosity &#x3b7; (Pa&#xb7;s) at 38&#xb0; C. and 60&#xb0; C. measured with a Brookfield viscometer which are plotted as Ln[&#x3b7;/(Pa&#xb7;s)] on ordinate versus 1/T (K) on abscissa (with the proviso that T is temperature (K)).

Growing community of inventors

Chiyoda-ku, Japan

Yu Nozasa