Polyester compositions for calendering
First Claim
1. A polyester composition for calendering, comprising:
- (a) a polyester comprising diacid residues, diol residues, and about 0.1 to about 0.3 weight percent branching monomer residues, based on the total weight of said polyester, wherein said polyester is a random copolymer having a crystallization half time from a molten state of at least 5 minutes and an inherent viscosity of about 0.6 to about 0.7 deciliters/gram (dL/g); and
(b) an additive effective to prevent sticking of said polyester to calendering rolls.
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Accused Products
Abstract
Polyester compositions that provide a higher throughput in calendering processes may be prepared from a polyester having crystallization half time of at least 5 minutes, an inherent viscosity of about 0.55 to about 0.75 dL/g, a branching monomer, and a release additive. The polyester compositions show a combination of excellent melt strength with good shear response that permits higher calendering line speeds before melt fracture occurs. Also disclosed are processes for film or sheet by calendering the above compositions and the film or sheet produced therefrom. The polyester compositions, film, or sheet also may include plasticizers and/or flame retardants to increase their flexibility and enable their use in commercial applications requiring flame resistance. The film and sheet have excellent appearance and can be used in a wide range of decorative and packaging applications.
89 Citations
33 Claims
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1. A polyester composition for calendering, comprising:
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(a) a polyester comprising diacid residues, diol residues, and about 0.1 to about 0.3 weight percent branching monomer residues, based on the total weight of said polyester, wherein said polyester is a random copolymer having a crystallization half time from a molten state of at least 5 minutes and an inherent viscosity of about 0.6 to about 0.7 deciliters/gram (dL/g); and (b) an additive effective to prevent sticking of said polyester to calendering rolls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A polyester composition for calendering, comprising:
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(a) a polyester having a crystallization half time from a molten state of at least 30 minutes and an inherent viscosity of about 0.6 to about 0.70 dL/g, wherein said polyester is a random copolymer comprising (i) diacid residues comprising at least 90 mole percent, based on the total moles of diacid residues, of one or more residues of;
terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, or isophthalic acid;(ii) diol residues comprising about 20 to about 70 mole percent, based on the total moles of diol residues, of one or more residues of;
1,4-cyclohexanedimethanol, neopentyl glycol, or diethylene glycol, and about 30 to about 80 mole percent of the residues of one or more diols selected from ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 1,3-cyclohexanedimethanol, bisphenol A, and polyalkylene glycol; and(iii) branching monomer residues comprising about 0.1 to about 0.3 wt %, based on the total weight of said polyester, of one or more residues of;
trimellitic anhydride, pyromellitic dianhydride, glycerol, sorbitol, 1,2,6-hexanetriol, pentaerythritol, trimethylolethane, or trimesic acid; and(b) about 0.1 wt % to about 10 wt %, based on the total weight of said polyester composition, of an additive effective to prevent sticking of said polyester to calendering rolls, wherein said additive comprises one or more fatty acid amides, metal salts of organic acids, fatty acids, fatty acid salts, fatty acid esters, hydrocarbon waxes, ester waxes, phosphoric acid esters, chemically modified polyolefin waxes;
glycerin esters, talc, or acrylic copolymers. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A process for film or sheet, comprising calendering a polyester composition at calendar roll temperature of about 160°
- C. to about 190°
C. said polyester composition comprising;(a) a polyester having a crystallization half time from a molten state of at least 30 minutes and an inherent viscosity of about 0.6 to about 0.7 dL/g, wherein said polyester is a random copolymer comprising (i) diacid residues comprising at least 80 mole percent, based on the total moles of diacid residues, of one or more residues of;
terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, or isophthalic acid;(ii) diol residues comprising about 10 to about 100 mole percent, based on the total moles of diol residues, of the residues of 1,4-cyclohexanedimethanol and 0 to about 90 mole percent of the residues of one or more diols selected from ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, diethylene glycol, 1,6-hexanediol, 1,8-octanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 1,3-cyclohexanedimethanol, bisphenol A, and polyalkylene glycol; and (iii) branching monomer residues comprising about 0.01 to about 0.3 weight percent (wt %), based on the total weight of said polyester, of the residues of one or more of monomers having 3 or more carboxyl substituents, hydroxyl substituents, or a combination thereof; and (b) an additive effective to prevent sticking of said polyester to calendering rolls. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33)
- C. to about 190°
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32. A film or sheet, comprising:
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(a) a polyester having a crystallization half time from a molten state of at least 30 minutes and an inherent viscosity of about 0.6 to about 0.70 dL/g, wherein said polyester is a random copolymer comprising (i) diacid residues comprising at least 90 mole percent, based on the total moles of diacid residues, of one or more residues of;
terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, or isophthalic acid;(ii) diol residues comprising about 10 to about 100 mole percent, based on the total moles of diol residues, of one or more residues of;
1,4-cyclohexanedimethanol, neopentyl glycol, or diethylene glycol, and 0 to about 90 mole percent of one or more residues of diols selected from ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 1,3-cyclohexanedimethanol, bisphenol A, and polyalkylene glycol; and(iii) branching monomer residues comprising about 0.1 to about 0.3 wt %, based on the total weight of said polyester, of one or more residues of;
trimellitic anhydride, pyromellitic dianhydride, glycerol, sorbitol, 1,2,6-hexanetriol, pentaerythritol, trimethylolethane, or trimesic acid; and(b) about 0.1 wt % to about 10 wt %, based on the total weight of said polyester composition, of an additive effective to prevent sticking of said polyester to calendering rolls, wherein said additive comprises one or more fatty acid amides, metal salts of organic acids, fatty acids, fatty acid salts, fatty acid esters, hydrocarbon waxes, ester waxes, phosphoric acid esters, chemically modified polyolefin waxes;
glycerin esters, talc, or acrylic copolymers;wherein said film or sheet is prepared by a calendering process.
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Specification