PROCESS FOR THE PREPARATION OF COPOLYESTERS BASED ON 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIOL AND 1,4-CYCLOHEXANEDIMETHANOL
First Claim
1. A process for the preparation of a copolyester, comprising:
- reacting a diester composition comprising at least one dialkyl terephthalic acid ester with a diol composition, said diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol, said reaction comprising (i) reacting said first diol component with said diester composition to form a polyester oligomer;
(ii) reacting said second diol component with said polyester oligomer of step (i) to form a modified polyester oligomer; and
(iii) heating said modified polyester oligomer to form a thermoplastic, random copolyester having an inherent viscosity of about 0.4 to about 1.0 dL/g;
wherein the molar ratio of all diols in said diol composition to all diesters in said diester composition is about 1.2 to about 1.5.
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Accused Products
Abstract
Disclosed is a process for the preparation of high molecular weight, thermoplastic copolyesters by reacting a diester composition comprising a dialkyl ester of terephthalic acid with a diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol. The diester composition can be reacted with the first diol component to produce a polyester oligomer that can be reacted further with the second diol component to produce a modified polyester oligomer. The modified polyester oligomer can then be heated to form a copolyester. The process reduces the precipitation of poly(1,4-cyclohexylene dimethylene) terephthalate in the reaction mixture.
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Citations
85 Claims
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1. A process for the preparation of a copolyester, comprising:
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reacting a diester composition comprising at least one dialkyl terephthalic acid ester with a diol composition, said diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol, said reaction comprising (i) reacting said first diol component with said diester composition to form a polyester oligomer;
(ii) reacting said second diol component with said polyester oligomer of step (i) to form a modified polyester oligomer; and
(iii) heating said modified polyester oligomer to form a thermoplastic, random copolyester having an inherent viscosity of about 0.4 to about 1.0 dL/g;
wherein the molar ratio of all diols in said diol composition to all diesters in said diester composition is about 1.2 to about 1.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A process for the preparation of a copolyester, comprising:
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reacting a diester composition, comprising at least one dialkyl terephthalic acid ester, with a diol composition, said diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol, said reaction comprising (i) reacting said first diol component with said diester component to form a polyester oligomer at a conversion of said 2,2,4,4-tetramethyl-1,3-cyclobutanediol of at least 50 mole percent, based on the total moles of said 2,2,4,4-tetramethyl-1,3-cyclobutanediol in said diol composition;
(ii) reacting said second diol component with said polyester oligomer of step (i) to form a modified polyester oligomer; and
(iii) heating said modified polyester oligomer to form a thermoplastic, random copolyester having an inherent viscosity of about 0.4 dL/g to about 1.0;
wherein the molar ratio of all diols in said diol composition to all diesters in said diester composition is about 1.1 to about 1.5. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. A process for the preparation of a copolyester, comprising:
reacting a diester composition comprising dimethyl terephthalate with a diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol, said reaction comprising (i) reacting said first diol component comprising about 100 mole percent of said 2,2,4,4-tetramethyl-1,3-cyclobutanediol, based on the total moles of 2,2,4,4-tetramethyl-1,3-cyclobutanediol in said diol composition, and 30 to about 80 mole percent of said 1,4-cyclohexanedimethanol, based on the total moles of 1,4-cyclohexanedimethanol in said diol composition, with said diester composition to form a polyester oligomer at a conversion of said 2,2,4,4-tetramethyl-1,3-cyclobutanediol of at least 50 mole percent, based on the total moles of said 2,2,4,4-tetramethyl-1,3-cyclobutanediol in said diol composition;
(ii) reacting said second diol component comprising about 20 to about 70 mole percent of said 1,4-cyclohexanedimethanol based on the total moles of 1,4-cyclohexanedimethanol in said diol composition, with said polyester oligomer of step (i) to form a modified polyester oligomer; and
(iii) heating said modified polyester oligomer to form a thermoplastic, random copolyester having an inherent viscosity of about 0.4 dL/g to about 1.0;
wherein the molar ratio of all diols in said diol composition to all diesters in said diester composition is about 1.1 to about 1.5. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
Specification