Poly(terephthalic acid diester)-poly(isophthalic acid diester) resin formulations having improved gas barrier properties
AssigneeArteva North America S.A.R.L.
InventorsAudrey C. Wu, Xiaoyan Huang, Jim Schwietert
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Abstract
The invention is directed to improved poly(terephthalic acid diester)-poly(isophthalic acid diester) resins, and in particular to improved polyethylene terephthalate-polyethylene isophthalate resin formulations, the improved formulations containing nucleating and chain-branching agents. The improved formulations of the invention have particular utility in the manufacture of plastic bottles.
Claims52
A resin composition comprising:
- about 1 mole % to about 30 mole % polyisophthalic acid diester, about 70 mole % to about 99 mole % polyterephthalic acid diester, about 250 ppm to about 5000 ppm chain-branching agent, and about 50 ppm to about 5000 ppm nucleating agent, wherein said nucleating agent is selected from the group consisting of:
- silica, fumed silica, clay, colloidal silica, silica beads and organic carboxylic acid salts.
A resin composition comprising about 8 mole % to about 20 mole % polyethylene isophthalate, about 80 mole % to about 92 mole % polyethylene terephthalate, about 250 to about 5000 ppm chain-branching agent, and about 50 ppm to about 5000 ppm nucleating agent, and an intrinsic viscosity of about 0.7 to about 1.2, wherein said nucleating agent is selected from the group consisting of:
- silica, fumed silica, clay, colloidal silica, silica beads and organic carboxylic acid salts.
A resin composition comprising about 8mole % to about 20mole % polyethylene-isophthalate, about 80mole % to about 92mole % polyethylene terephthalate, about 1200 to about 3000 ppm ethoxylated trimethylolpropane, and about 50 to about 2000 ppm nucleating agent selected from the group consisting of
- (a) the sodium and potassium salts of a C.sub.16 -C.sub.20 aliphatic monocarboxylic acid, benzoic acid, methylbenzoic acid, dimethylbenzoic acid and napthanoic acid, and
- (b) fumed silica;
- wherein the resin composition has an intrinsic viscosity of about 0.85 to about 1.0.
A resin composition comprising about 8mole % to about 12mole % polyethylene-isophthalate, about 88mole % to about 92mole % polyethylene terephthalate, about 1200 to about 3000 ppm ethoxylated trimethylolpropane, and about 0.05mole % to about 0.2mole % nucleating agent selected from the group consisting of
- (a) the sodium and potassium salts of a C.sub.16 -C.sub.20 aliphatic monocarboxylic acid, benzoic acid, methylbenzoic acid, dimethylbenzoic acid and napthanoic acid, and
- (b) fumed silica;
- wherein the resin composition has an intrinsic viscosity of about 0.85 to about 1.0.
A process for making a polyethylene terephthalate-polyethylene isophthalate resin compositions useful for forming shaped articles, said process comprising:
- (a) mixing in a batch or continuous reactor vessel substances comprising:
- (i) about 8mole % to about 20mole % polyethylene isophthalate;
- (ii) about 80mole % to about 92mole % polyethylene terephthalate;
- (iii) about 250 to about 5000 ppm of a chain-branching agent selected from the group consisting of:
- (a) polyfunctional alcohols having three or more hydroxyl functional groups;
- (b) pentaerythritol;
- and
- (c) polycarboxylates, and their acid precursors and anhydrides;
- (iv) about 1mole % to about 2mole % diethylene glycol or diethylene glycol dimethyl ether;
- and
- (v) selected amounts of catalysts selected from the group consisting of cobalt, manganese and antimony;
- (b) reacting for a selected time and at a selected temperature the mixture of step (a) to form a homogeneous polyethylene isophthalate-polyethylene terephthalate resin composition,
- wherein optionally during said reaction, volatile substances are removed from the reaction mass, either continuously or periodically, by application of reduced pressure;
- (c) stabilizing the reaction of step (b) by addition of a selected quantity of a selected phosphorus-containing stabilizing agent;
- and
- (d) optinalyy, solid-stating the product of step (c) to obtain a polyethylene isophthalate-polyethylene terephthalate resin composition having an intrinsic viscosity of about 0.85 to about 0.95;
- wherein from about 50 to about 3000 ppm of a nucleating agent is added to either of steps (a) or (d), said nucleating agent being selected from the group consisting of:
- (a) the alkali and alkaline-earth metals salts of C.sub.8 -C.sub.20 aliphatic and C.sub.7 -C.sub.10 aromatic monocarboxylic acids, and
- (b) fumed silica.
A process for making a polyethylene terephthalate-polyethylene isophthalate resin compositions useful for forming shaped articles, said process comprising:
- (a) mixing in a batch or continuous reactor vessel substances comprising:
- (i) about 8mole % to about 20mole % a substance selected from the group consisting of terephthalic acid and non-polymeric diesters thereof;
- (ii) about 80mole % to about 92mole % of a substance selected from the group consisting of isophthalic acid and non-polymeric diesters thereof,
- (iii) a diol in sufficient quantity to react with the total molar amount of (i) and (ii),
- (iv) about 250 to about 5000 ppm of a chain-branching agent selected from the group consisting of:
- (a) polyfunctional alcohols having three or more hydroxyl functional groups;
- (b) pentaerythritol;
- and
- (c) polycarboxylates, and their acid precursors and anhydrides;
- (v) about 1% to about 2% diethylene glycol or diethylene glycol dimethyl ether;
- and
- (vi) selected amounts of catalysts selected from the group consisting of cobalt, manganese and antimony;
- (b) reacting for a selected time and at a selected temperature the mixture of step (a) to form a homogeneous polyethylene isophthalate-polyethylene terephthalate resin composition,
- wherein optionally during said reaction, volatile substances are removed from the reaction mass, either continuously or periodically, by application of reduced pressure;
- (c) stabilizing the reaction of step (b) by addition of a selected quantity of a selected phosphorus-containing stabilizing agent;
- and
- (d) optionally, solid-stating the product of step (c) to obtain a poly(isophthalate-terephthalate) resin composition having an intrinsic viscosity of about 0.85 to about 1.0;
- wherein from about 50 to about 3000 ppm of a nucleating agent is added to either of steps (a) or (d), said nucleating agent being selected from the group consisting of:
- (a) the alkali and alkaline-earth metals salts of C.sub.8 -C.sub.20 aliphatic and C.sub.7 -C.sub.10 aromatic monocarboxylic acids, and
- (b) fumed silica;
- and
- wherein using the product of step (d) is used in a selected process to make a shaped article.
Dependencies are inferred from the claim text.