Poly(1,3-propylene terephthalate)
AssigneeHoechst Celanese Corporation
InventorsMarvin L. Doerr, Joseph J. Hammer, J. R. Dees
Life of this patent
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Abstract
A process for producing poly(1,3-propylene terephthalate) from the reaction of either terephthalic acid or a lower dialkyl ester of terephthalic acid and 1,3-propanediol and polymerization of the monomer produced therefrom using a novel catalyst system. The novel catalyst composition includes employing an effective catalytic amount tin in the polycondensation reaction. Using the catalyst system and Hostaperm.RTM. pigments allows for the production of poly(1,3-propylene terephthalate) having yellowness of less than 4 and an IV of at least 0.80 dl/g.
Claims29
A process for making poly(1,3-propylene terephthalate) comprising steps of:
- a) reacting terephthalic acid or, dimethyl terephthalate, and 1,3-propanediol to produce a monomer and reaction byproduct;
- b) removing said reaction byproduct during said reaction;
- c) polymerizing the monomer by a polycondensation reaction to produce poly(1,3-propylene terephthalate) and 1,3-propanediol;
- and
- d) removing said 1,3-propanediol during the polycondensation reaction;
- wherein the improvement comprises adding an effective catalytic amount of tin for the polycondensation reaction.
A process for making poly(1,3-propylene terephthalate) comprising the steps of:
- a) reacting terephthalic acid or, dimethyl terephthalate and 1,3-propanediol to produce a monomer and a reaction byproduct;
- b) removing said reaction byproduct during said reaction;
- c) polymerizing the monomer by a polycondensation reaction to produce poly(1,3-propylene terephthalate) and 1,3-propanediol;
- and
- d) removing said 1,3-propanediol during the polycondensation reaction;
- wherein the improvement comprises adding an effective catalytic amount of a catalyst selected from the group consisting of titanium and tin before reaction a);
- and adding an effective catalytic amount of tin before the polycondensation reaction.
A process for making poly(1,3-propylene terephthalate) comprising steps of:
- a) reacting terephthalic acid or dimethyl terephthalate and 1,3-propanediol to produce a monomer and reaction byproduct;
- b) removing said reaction byproduct during said reaction;
- c) polymerizing the monomer by a polycondensation reaction to produce poly(1,3-propylene terephthalate) and 1,3-propanediol;
- and
- d) removing said 1,3-propanediol during the polycondensation reaction;
- wherein the improvement comprises adding an effective catalytic amount of catalyst selected from the group consisting of titanium and tin before reaction a);
- and adding an effective catalytic amount of tin and an effective amount of pigments before the polycondensation reaction.
Dependencies are inferred from the claim text.