Aliphatic oligocarbonate polyols prepared in the presence of a catalyst and a process for preparing the same
AssigneeBayer Aktiengesellschaft
InventorsSteffen Hofacker, Christoph Gurtler, Jorg Tillack
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Abstract
The present invention relates to aliphatic oligocarbonate polyols prepared by the transesterification of organic carbonates with aliphatic polyols in the presence of at least one catalyst which contains i) at least one rare earth metal or compounds thereof or ii) at least one metal of group III B of the periodic table of the elements or compounds thereof or iii) mixtures of i) and ii) and to a process for preparing the same.
Claims17
A process for preparing an aliphatic oligocarbonate polyol which has a molecular weight of from 500 to 5000 comprising:
- reacting
- A) at least one organic carbonate;
- and
- B) at least one aliphatic polyol;
- in the presence of
- C) at least one catalyst comprising
- i) at least one rare earth metal, complex, organic or inorganic compound or salt thereof or mixtures thereof;
- or
- ii) at least one metal of group III B of the periodic table of the elements, complex, organic or inorganic compound or salt thereof or mixtures thereof;
- or
- iii) mixtures of i) and ii);
- provided that the rare earth metal or metal of group III B of the periodic table of the elements is not cerium, a cerium compound or lanthanum hydroxide.
An aliphatic oligocarbonate polyol which has a molecular weight of from 500 to 5000 which comprises the reaction product of:
- A) at least one organic carbonate;
- and
- B) at least one aliphatic polyol;
- wherein A) and B) have been reacted in the presence of
- C) at least one catalyst comprising
- i) at least one rare earth metal, complex, organic or inorganic compound or salt thereof or mixtures thereof;
- or
- ii) at least one metal of group III B of the periodic table of the elements, complex, organic or inorganic compound or salt thereof or mixtures thereof;
- or
- iii) mixtures of i) and ii);
- provided that the rare earth metal or metal of group III B of the periodic table of the elements is not cerium, a cerium compound or lanthanum hydroxide.
Dependencies are inferred from the claim text.