Method of producing aliphatic polyester and product obtained thereby
AssigneesNational Institute of Advanced Industrial Science and Technology, Takashi Masuda
InventorsTakashi Masuda, Amin Cao
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Abstract
A method of producing an aliphatic polyester, including polycondensing an aliphatic diol and an aliphatic dicarboxylic acid compound, or a prepolymer thereof in the presence of a metal-containing ester interchange catalyst and a phosphorus-containing co-catalyst such as an ammonium, calcium or magnesium salt of hydrogen-containing phosphoric acid or an organic phosphinic acid. An oxycarboxylic acid compound or its prepolymer may also be used as a raw material.
Claims10
A method of producing an aliphatic polyester, comprising polycondensing a raw material selected from the group consisting of
- (A1) mixtures of an aliphatic diol and at least one aliphatic dicarboxylic acid compound selected from the group consisting of aliphatic dicarboxylic acids, diesters of aliphatic dicarboxylic acids and aliphatic dicarboxylic acid anhydrides,
- (A2) prepolymers of mixtures (A1),
- (A3) oxycarboxylic acid compounds,
- (A4) prepolymers of oxycarboxylic acid compounds (A3),
- (A5) mixtures of (a) an aliphatic diol, (b) at least one aliphatic dicarboxylic acid compound selected from the group consisting of aliphatic dicarboxylic acids, diesters of aliphatic dicarboxylic acids and aliphatic dicarboxylic acid anhydrides and (c) at least one auxiliary compound selected from the group consisting of aliphatic compounds and aromatic compounds having at least two functional groups which are reactive with at least one of (a) and (b),
- (A6) prepolymers of mixtures (A5),
- (A7) mixtures of (d) at least one oxycarboxylic acid compound and (e) at least one auxiliary compound other than oxycarboxylic acid compounds and selected from the group consisting of aliphatic compounds and aromatic compounds having at least two functional groups which are reactive with (d), and
- (A8) prepolymers of mixtures (A7) in the presence of a metal-containing ester interchange catalyst and MgHPO4.3H2O as a co-catalyst
- wherein said co-catalyst is present in an amount providing an atomic ratio of the phosphorus of said co-catalyst to the metal of said metal-containing ester interchange catalyst of 0.0 1-0.8.
Dependencies are inferred from the claim text.