Polyester resin compositions for calendering

• US 20030065075A1
• Filed: 10/31/2002
• Published: 04/03/2003
• Est. Priority Date: 03/17/1998
• Status: Active Grant

• Current Assignee: Hubertus Jacobus Wilhelmus Moolenaar, Paul Mary Flynn, Richard Leon Mcconnell, Timothy Michael Sanders
• Original Assignee: Hubertus Jacobus Wilhelmus Moolenaar, Paul Mary Flynn, Richard Leon Mcconnell, Timothy Michael Sanders
• Inventors: McConnell, Richard Leon, Flynn, Paul Mary, Sanders, Timothy Michael, Moolenaar, Hubertus Jacobus Wilhelmus
• Granted Patent: US 6,846,440 B2
• Time in Patent Office: Days
• US Class Current: 524/394
• CPC Class Codes: C08G 63/181 Acids containing aromatic rings
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C08K 5/103 with polyalcohols
• CPC Class Codes: C08K 5/20 Carboxylic acid amides
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence

Abstract

A polyester resin composition is calendered to produce a film or a sheet. The polyester resin composition is a polyester having a crystallization half time from a molten state of at least 5 minutes combined with an additive for preventing sticking of the polyester to calendering rolls.

Claims

1. A polyester resin composition for calendering comprising (a) a polyester having a crystallization half time from a molten state of at least 5 minutes and (b) an additive for preventing sticking of the polyester to calendering rolls.

2. The polyester resin composition of claim 1 wherein the crystallization half time of the polyester is at least 12 minutes.

3. The polyester resin composition of claim 1 wherein the polyester is amorphous having a crystallization half time of infinity.

4. The polyester resin composition of claim 1 wherein the polyester comprises (i) at least 80 mole percent of a diacid residue component selected from terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, isophthalic acid and mixtures thereof and (ii) at least 80 mole percent of a diol residue component selected from diols containing 2 to about 10 carbon atoms and mixtures thereof, wherein the diacid residue component is based on 100 mole percent and the diol residue component is based on 100 mole percent.

5. The polyester resin composition of claim 4 wherein the diol residue component is selected from ethylene glycol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, and mixtures thereof

6. The polyester resin composition of claim 4 wherein the diol residue component comprises from about 10 to about 100 mole percent 1,4-cyclohexanedimethanol and from 90 to about 0 mole percent ethylene glycol.

7. The polyester resin composition of claim 1 wherein the additive is an internal lubricant, a slip agent or a mixture thereof.

8. The polyester resin composition of claim 1 further comprising (c) an oxidative stabilizer.

9. The polyester resin composition of claim 1 further comprising (d) a melt strength enhancer.

10. A process for preparing a film or a sheet comprising the step of calendering a polyester resin composition comprising (a) a polyester having a crystallization half time from a molten state of at least 5 minutes and (b) an additive for preventing sticking of the polyester to calendering rolls.

11. The process of claim 10 wherein the step of calendering, the polyester resin composition is passed through a compressive nip between at least two calendering rolls at temperatures of about 130°

C. to about 250°

C.

12. The process of claim 10 wherein the step of calendering, the polyester resin composition is passed through a compressive nip between at least two calendering rolls at temperatures of about 140°

C. to about 190°

C.

13. The process of claim 10 wherein prior to the step of calendering, the polyester resin composition is in molten, pellet or powder forms.

14. The process of claim 10 wherein the crystallization half time of the polyester is at least 12 minutes.

15. The process of claim 10 wherein the polyester is amorphous having a crystallization half time of infinity.

16. The process of claim 10 wherein the polyester comprises (i) at least 80 mole percent of a diacid residue component selected from terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, isophthalic acid and mixtures thereof and (ii) at least 80 mole percent of a diol residue component selected from diols containing 2 to about 10 carbon atoms and mixtures thereof, wherein the diacid residue component is based on 100 mole percent and the diol residue component is based on 100 mole percent.

17. The process of claim 16 wherein the diol residue component is selected from ethylene glycol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, and mixtures thereof.

18. The process of claim 16 wherein the diol residue component comprises from about 10 to about 100 mole percent 1,4-cyclohexane-dimethanol and from 90 to about 0 mole percent ethylene glycol

19. The process of claim 10 wherein the additive is an internal lubricant, a slip agent or a mixture thereof

20. The process of claim 10 wherein prior to the step of calendering, an oxidative stabilizer is added.

21. The process of claim 10 wherein prior to the step of calendering, a melt strength enhancer is added.

22. The film or sheet of claim 10 wherein the polyester resin composition has an inherent viscosity retention of greater than 90 percent after calendering as compared to prior to calendering.

23. The process of claim 22 wherein the viscosity retention is greater than 95 percent.

24. A film or sheet made by a process comprising the step of calendering a polyester resin composition comprising (a) a polyester having a crystallization half time from a molten state of at least 5 minutes and (b) an additive for preventing sticking of the polyester to calendering rolls.

25. The film or sheet of claim 24 wherein the step of calendering, the polyester composition is passed through a compressive nip between at least two calendering rolls at temperatures of about 130°

C. to about 250°

C.

26. The film or sheet of claim 24 wherein the crystallization half time of the polyester is at least 12 minutes.

27. The film or sheet of claim 24 wherein the polyester is amorphous having a crystallization half time of infinity.

28. The film or sheet of claim 24 wherein the polyester comprises (i) at least 80 mole percent of a diacid residue component selected from terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexane-dicarboxylic acid, isophthalic acid and mixtures thereof and (ii) at least 80 mole percent of a diol residue component selected from diols containing 2 to about 10 carbon atoms and mixtures thereof, wherein the diacid residue component is based on 100 mole percent and the diol residue component is based on 100 mole percent.

29. The film or sheet of claim 28 wherein the diol residue component is selected from ethylene glycol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, and mixtures thereof.

30. The film or sheet of claim 28 wherein the diol residue component comprises from about 10 to about 100 mole percent 1,4-cyclohexane-dimethanol and from 90 to about 0 mole percent ethylene glycol.

31. The film or sheet of claim 28 wherein the polyester resin composition has an inherent viscosity retention of greater than 90 percent after calendering as compared to prior to calendering

32. The process of claim 31 wherein the viscosity retention is greater than 95 percent.