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US 10,767,041 B2Granted
Polymer compositions and substrates for high temperature transparent conductive film applications
AssigneeEastman Chemical Company
InventorWayne Ken Shih
Life of this patent
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Abstract
Described are polymer compositions that include a blend of copolyester polymers based on monomers that include on terephthalic acid (TPA), isophthalic acid (IPA) and 1,4-cyclohexanedimethanol (CHDM), wherein the blend includes a first copolyester that is semi-crystalline and a second copolyester that is amorphous; and films made from the polymer compositions useful for transparent high temperature conductive film applications.
Claims19
A polymer composition comprising a blend of a first PCTA copolyester and a second PCTA copolyester,
- said first PCTA copolyester comprising:
- (a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues;
- and
- (b) diol residues comprising at least 85 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- said second PCTA copolyester comprising:
- (a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues;
- and
- (b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- wherein the first PCTA copolyester is semi-crystalline;
- wherein the second PCTA copolyester is amorphous;
- and
- wherein the blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.
9 more elements
A polyester film comprising a melt formed polyester blend, wherein said polyester blend comprises a first PCTA copolyester and a second PCTA copolyester,
- said first PCTA copolyester comprising:
- (a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues;
- and
- (b) diol residues of 100 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- said second PCTA copolyester comprising:
- (a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues;
- and
- (b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- wherein the first PCTA copolyester is semi-crystalline;
- wherein the second PCTA copolyester is amorphous;
- wherein said blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- and
- wherein the film has a thickness in the range from about 25 to about 250 microns.
10 more elements
A method of making a biaxially oriented polyester film, said method comprising blending a first PCTA copolyester and a second PCTA copolyester;
- forming a melt processable polymer composition from the blend;
- melt forming the melt processable polymer composition to form a sheet;
- and biaxially stretching the sheet to form a film, wherein said polyester blend comprises a first PCTA copolyester and a second PCTA copolyester,
- said first PCTA copolyester comprising:
- (a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues;
- and
- (b) diol residues comprising at least 85 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- said second PCTA copolyester comprising:
- (a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues;
- and
- (b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
- wherein the first PCTA copolyester is semi-crystalline;
- wherein the second PCTA copolyester is amorphous;
- wherein said blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.
11 more elements
Dependencies are inferred from the claim text.