Low unsaturation polyoxyalkylene polyether polyols

C - Chemistry – Metallurgy – 08 – G

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C08G 65/26 (2006.01) C08G 65/28 (2006.01) C08G 65/32 (2006.01)

Patent

CA 2193254

There is now provided an isocyanate reactive polyoxyalkylene polyether polymer having a structure as follows: the nucleus of an initiator compound, an internal block of oxypropylene groups, and a second block of oxyalkylene groups; the internal block of oxypropylene groups being between the nucleus of the initiator and the second block, the second block containing at least some oxyalkylene groups derived from at least a C4 or higher alkylene oxide. This structure allows one to make a polyether polymer having a low degree of unsaturation, adjust the degree of hydrophobicity to a wide range of values, and may be simply manufactured without depending upon the use of exotic catalysts. The amount of the internal block of oxypropylene groups is advantageously from 25 weight percent to 80 weight percent based on the weight of all oxyalkylene groups and initiator compound. The amount of the second block containing a C4 or higher alkylene oxide should be effective to reduce the unsaturation of the polyether polyol to 0.06 meq KOH/g of polyol or less.

n fournit un polymère de polyoxyalkylène-polyéther à groupement réactif isocyanate ayant la structure suivante : le noyau d'un composé initiateur, un bloc interne de groupes oxypropylène et un second bloc de groupes oxyalkylène; le bloc interne de groupes oxypropylène étant situé entre le noyau de l'initiateur et le second bloc, le second bloc contenant au moins certains groupes oxyalkylène dérivés d'un oxyde d'alkylène en C4 ou plus. Cette structure permet de fabriquer une polyéther polymérique ayant un faible degré d'insaturation et d'ajuster le degré d'hydrophobicité selon une gamme étendue de valeurs; de plus, sa fabrication est simple puisqu'il n'est pas nécessaire d'utiliser des catalyseurs exotiques. Le bloc interne de groupes oxypropylène représente 25 à 80 % en poids, par rapport au poids de tous les groupes oxyalkylène et du composé initiateur. Le second bloc contenant un oxyde d'alkylène en C4 ou plus devrait être présent en quantité suffisante pour réduire le degré d'insaturation du polyéther-polyol à 0,06 mEq KOH/g de polyol ou moins.

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