Polyoxytetramethylene glycol and method for producing the same

C - Chemistry – Metallurgy – 08 – G

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Details

C08G 65/20 (2006.01) C08G 65/26 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2376397

Disclosed is a high heat resistance and low viscosity polyoxytetramethylene glycol (PTMG) having the following characteristics (1) to (4): (1) a number average molecular weight of from 500 to 3000; (2) a molecular weight distribution of 1.8 or less in terms of the Mw/Mn ratio; (3) a content of high molecular weight PTMG molecules of from 2 to 5 % by weight, wherein the high molecular weight PTMG molecules are 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.

Cette invention se rapporte à un polyoxytétraméthylène-glycol (PTMG) ayant des caractéristiques améliorées de résistance thermique et de faible viscosité et possédant les propriétés suivantes: (1) son poids moléculaire moyen en nombre est compris entre 500 et 3000, (2) la distribution du poids moléculaire, qui est le rapport entre le poids moléculaire moyen en poids Mw, et le poids moléculaire en nombre Mn, Mw/Mn est égale ou inférieure à 1,8; (3) la teneur en molécules de PTMG ayant un poids moléculaire égal à 6 fois au moins le poids moléculaire moyen en nombre est comprise entre 2 et 5 % en poids, calculée sur la base de la quantité totale de toutes les molécules de PTMG; et (4) la teneur en hétéropolyacides est comprise entre 10 et 900 ppb en poids.

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