Mitsubishi Chemical Corporation

Yoko Nakagawa

Yoshikazu Kanamori

Kazunao Kusano

Kaori Yano

Yusuke Izawa

Nobuyuki Kobayashi

Ryo Yamashita

Takanori Taniguchi

Kazuki Wakabayashi

Takayuki Yamanaka

The present invention relates to a polycarbonate diol comprising a structural unit derived from a compound represented by the following formula (A) and a structural unit derived from a compound represented by the following formula (B), wherein the hydroxyl value is from 20 to 450 mg-KOH/g:HO&#x2014;R&#x2014;OH&#x2003;&#x2003;(A)HO&#x2014;R&#x2014;OH&#x2003;&#x2003;(B)

Polycarbonate diol and polyurethane using same

The present invention provides a high-molecular-weight polyether polyol ensuring that when used as a polyurethane raw material, a polyurethane having excellent flexibility and elastic recovery can be obtained; and a method for producing, with high productivity, a polyether polyol having a higher number average molecular weight and a narrower molecular weight distribution than those of the raw material polyether polyol, and the polyether polyol of the present invention has a number average molecular weight of 3,500 to 5,500 and a molecular weight distribution of 1.7 to 3.0.

Polyether polyol, method for producing polyether polyol, polyester elastomer and polyurethane

The present invention relates to a method for producing a polycarbonate diol, comprising subjecting a compound represented by the following formula (A) containing from 0.01 to 1.0 wt % of an aldehyde derivative, a compound represented by the following formula (B), and a carbonate compound to polycondensation by a transesterification reaction in the presence of a catalyst to produce a polycarbonate diol having a number average molecular weight of 250 to 5,000:HO&#x2014;(CH)&#x2014;OH&#x2003;&#x2003;(A)HO&#x2014;R&#x2014;OH&#x2003;&#x2003;(B)wherein in the formula (B), Rrepresents a substituted or unsubstituted divalent alkylene group having a carbon number of 3 to 20, wherein the compound of the formula (A) is not included by the formula (B).

Method for producing polycarbonate diol, polycarbonate diol and polyurethane using same

Growing community of inventors

Mie, Japan

Yoko Nakagawa