Claims
- 1. A process for producing a profile by profile extrusion comprising the steps of:
(a) providing a melt of a polyester composition at a melt temperature, wherein the polyester composition has an inherent viscosity of at least 0.65 dl/g and comprises
(1) a diacid component comprising 100 to 98.0 mole percent of residues of a primary acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, isophthalic acid and mixtures thereof; (2) a glycol component comprising 100 to 98.0 mole percent of residues of a primary glycol selected from the group consisting of ethylene glycol, 1,4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol, and mixtures thereof; and (3) 0.05 to 2.0 mole percent of residues of a branching agent selected from the group consisting of an acidic branching agent comprising a tri-functional or greater monomer, an alcoholic branching agent comprising a tri-functional or greater monomer, and mixtures thereof; wherein the polyester composition is based on 100 mole percent of the diacid component and 100 mole percent of the glycol component; and the acidic branching agent comprises a portion of the diacid component and the alcoholic branching agent comprises a portion of the glycol component; (b) extruding the melt through a die to form a profile.
- 2. The process of claim 1 wherein the polyester composition has a melt strength of greater than 0 percent at the melt temperature.
- 3. The process of claim 2 wherein the melt strength at the melt temperature is greater than 20 percent.
- 4. The process of claim 1 wherein a power law index of the polyester composition is less than 0.6.
- 5. The process of claim 4 wherein the power law index is less than 0.575.
- 6. The process of claim 5 wherein the power law index is less than 0.5.
- 7. The process of claim 1 wherein the profile has a surface roughness of 5000 Angstroms or less.
- 8. The process of claim 7 wherein the surface roughness is 1000 Angstroms or less.
- 9. The process of claim 8 wherein the surface roughness is 500 Angstroms or less.
- 10. The process of claim 1 wherein the branching agent is present from 0.1 to 1.0 mole percent.
- 11. The process of claim 1 wherein the primary acid comprises at least 60 mole percent terephthalic acid and up to 40 mole percent isophthalic acid.
- 12. The process of claim 1 wherein the primary acid is modified by substituting one or more of the primary acids with up to 40 mole percent of a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 4 to 12 carbon atoms, cycloaliphatic dicarboxylic acids having 8 to 12 carbon atoms, and mixtures thereof.
- 13. The process of claim 12 wherein the dicarboxylic acid is selected from the group consisting of phthalic acid, cyclohexanedicarboxylic acid, cyclohexanediacetic acid, diphenyl-4,4′-dicarboxylic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and mixtures thereof.
- 14. The process of claim 1 wherein the branching agent is selected from the group consisting of trimellitic anhydride, pyromellitic dianhydride (PMDA), glycerol, sorbitol, hexane triol-1,2,6, pentaerythritol, trimethylolethane, trimesic acid, or mixtures thereof.
- 15. The process of claim 1 wherein the acidic branching agent is trimellitic anhydride and is present in the amount of 0.1 to 0.35 mole percent.
- 16. The process of claim 1 wherein the primary glycol comprises 0 to 100 mole percent ethylene glycol, 0 to 100 mole percent 1,4-cyclohexanedimethanol, and 0 to 40 mole percent neopentyl glycol.
- 17. The process of claim 1 wherein the primary glycol comprises 57 to 90 mole percent ethylene glycol, 10 to 40 mole percent 1,4-cyclohexanedimethanol or neopentyl glycol, and 0 to 3 mole percent diethylene glycol.
- 18. The process of claim 1 wherein the primary glycol is modified with up to 40 mole percent of diols selected from the group consisting of cycloaliphatic diols having 6 to 15 carbon atoms, aliphatic diols having 3 to 8 carbon atoms, and mixtures thereof.
- 19. The process of claim 1 wherein the branching agent is tri-functional, the polyester composition further comprises a chain terminator of a monofunctional acid or alcohol, and the chain terminator and branching agent are present at a ratio of 3:1.
- 20. The process of claim 19 wherein the chain terminator is selected from the group consisting of stearic acid and benzoic acid.
- 21. The process of claim 1 wherein the branching agent is tetra-functional, the polyester composition further comprises a chain terminator of a monofunctional acid or alcohol, and the chain terminator and branching agent are present at a ratio of 4:1.
- 22. In a process for producing a profile by profile extrusion of a thermoplastic resin wherein a melt of the thermoplastic resin at a melt temperature is extruded through a die to form the profile, the improvement comprising using as the thermoplastic resin a polyester composition having an inherent viscosity of at least 0.65 dl/g and comprising:
(a) a diacid component comprising 100 to 98.0 mole percent of residues of a primary acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, isophthalic acid and mixtures thereof; (b) a glycol component comprising 100 to 98.0 mole percent of residues of a primary glycol selected from the group consisting of ethylene glycol, 1,4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol, and mixtures thereof; and (c) 0.05 to 2.0 mole percent of residues of a branching agent selected from the group consisting of an acidic branching agent comprising a tri-functional or greater monomer, an alcoholic branching agent comprising a tri-functional or greater monomer, and mixtures thereof; wherein the polyester composition is based on 100 mole percent of the diacid component and 100 mole percent of the glycol component and the acidic branching agent comprises a portion of the diacid component and the alcoholic branching agent comprises a portion of the glycol component;
- 23. The process of claim 22 wherein the polyester composition has a melt strength of greater than 0 percent at the melt temperature.
- 24. The process of claim 22 wherein a power law index of the polyester composition is less than 0.6.
- 25. The process claim 22 wherein the profile has a surface roughness of 5000 Angstroms or less.
- 26. A profile made by profile extrusion comprising a polyester composition having an inherent viscosity of at least 0.65 dl/g and comprising:
(a) a diacid component comprising 100 to 98.0 mole percent of residues of a primary acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, isophthalic acid and mixtures thereof; (b) a glycol component comprising 100 to 98.0 mole percent of residues of a primary glycol selected from the group consisting of ethylene glycol, 1,4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol, and mixtures thereof; and (c) 0.05 to 2.0 mole percent of residues of a branching agent selected from the group consisting of an acidic branching agent comprising a tri-functional or greater monomer, an alcoholic branching agent comprising a tri-functional or greater monomer, and mixtures thereof; wherein the polyester composition is based on 100 mole percent of the diacid component and 100 mole percent of the glycol component and the acidic branching agent comprises a portion of the diacid component and the alcoholic branching agent comprises a portion of the glycol component.
- 27. The profile of claim 26 wherein a power law index of the polyester composition is less than 0.6.
- 28. The profile of claim 26 having a surface roughness of 5000 Angstroms or less.
- 29. The profile of claim 28 having a surface roughness of 1000 Angstroms or less.
- 30. The profile of claim 29 having a surface roughness of 500 Angstroms or less.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application Serial No. 60/139,285 filed Jun. 15, 1999 titled “Polyester Compositions for Profile Extrusion”.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60139285 |
Jun 1999 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09560455 |
Apr 2000 |
US |
Child |
10459670 |
Jun 2003 |
US |