Claims
- 1. A polyether ester elastomer comprising a copolymer of:(A) at least one aromatic dicarboxylic acid or an ester-forming derivative thereof; (B) at least one diol selected from the group consisting of an aliphatic diol and an alicyclic diol, each having 2 to 10 carbons; and (C) a polyoxytetramethylene glycol (PTMG), wherein said polyether ester elastomer contains PTMG units in an amount of from 10 to 90% by weight, based on the weight of said polyether ester elastomer, said PTMG having the following characteristics (1) to (4): (1) a number average molecular weight of from 500 to 4000; (2) a molecular weight distribution of 2.0 or less in terms of the Mw/Mn ratio, wherein Mw represents the weight average molecular weight of PTMG and Mn represents the number average molecular weight of PTMG; (3) a content of high molecular weight PTMG molecules of 10% by weight or less, based on the total weight of all PTMG molecules, wherein said high molecular weight PTMG molecules are defined as PTMG molecules having molecular weights which are at least six times as large as the number average molecular weight of all PTMG molecules; and (4) a heteropolyacid content of from 10 to 900 ppb by weight.
- 2. The polyether ester elastomer according to claim 1, wherein the number average molecular weight of said PTMG is 700 to 3000.
- 3. The polyether ester elastomer according to claim 1, wherein the molecular weight distribution of said PTMG is not more than 1.75.
- 4. The polyether ester elastomer according to claim 1, wherein the content of high molecular weight PTMG molecules is 2 to 5% by weight.
- 5. The polyether ester elastomer according to claim 1, wherein the heteropolyacid content of said PTMG is 10 to 500 ppb by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-233014 |
Aug 1999 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/JP00/05563 which has an International filing date of Aug. 18, 2000, which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP00/05563 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/14447 |
3/1/2001 |
WO |
A |
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