US2005153084A1PendingUtilityA1

PET with stress cracking resistance, preform and container made therewith and method

38
Priority: Jan 9, 2004Filed: Jan 9, 2004Published: Jul 14, 2005
Est. expiryJan 9, 2024(expired)· nominal 20-yr term from priority
Inventors:Yu Shi
Y10T428/1352C08L 67/02C08L 51/04C08L 23/0853C08L 53/025C08L 23/0869C08L 53/02C08L 9/00C08L 55/02
38
PatentIndex Score
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Claims

Abstract

A preform comprising an open-ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion comprising a stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier. The preform is blow molded to form a corresponding container. Polyester compositions and methods are also disclosed. The impact modifier improves the stress cracking resistance of low IV PET such that the containers perform similar to those made of high IV PET.

Claims

exact text as granted — not AI-modified
1 . A preform comprising an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion and comprising a stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier.  
     
     
         2 . A preform as in  claim 1  wherein the impact modifier is an elastomer.  
     
     
         3 . A preform as in  claim 1  wherein the impact modifier is selected from the group consisting of polyethylene-based elastomers, butadiene-based elastomers, and isoprene-based elastomers.  
     
     
         4 . A preform as in  claim 1  wherein the impact modifier is a polyethylene-based elastomer.  
     
     
         5 . A preform as in  claim 1  wherein the impact modifier is a core-shell impact modifier.  
     
     
         6 . A preform as in  claim 1  wherein the impact modifier is ethylene-acrylate copolymer.  
     
     
         7 . A preform as in  claim 1  wherein the impact modifier is modified to increase compatibility of the impact modifier with poly(ethylene terephthalate) based resin.  
     
     
         8 . A preform as in  claim 1  wherein the impact modifier is modified to more closely match the reflective index of the poly(ethylene terephthalate) based resin.  
     
     
         9 . A preform as in  claim 1  wherein the impact modifier is present in an amount effective to enhance the stress cracking resistance of the stress cracking resistant polyester composition relative to a polyester composition not including the impact modifier.  
     
     
         10 . A preform as in  claim 1  wherein the impact modifier is present in an amount from about 1 to about 15% by weight of the stress cracking resistant polyester composition.  
     
     
         11 . A preform as in  claim 1  wherein the impact modifier is present in an amount from about 3 to about 10% by weight of the stress cracking resistant polyester composition.  
     
     
         12 . A preform as in  claim 1  wherein the impact modifier is present in an amount from about 3 to about 6% by weight of the stress cracking resistant polyester composition.  
     
     
         13 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin has an IV from about 0.65 to about 0.90 dL/g.  
     
     
         14 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin has an IV from about 0.65 to about 0.86 dL/g.  
     
     
         15 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin has an IV from about 0.65 to about 0.80 dL/g.  
     
     
         16 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin has an IV from about 0.68 to about 0.76 dL/g.  
     
     
         17 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin has an IV below about 0.76 dL/g.  
     
     
         18 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin comprises a comonomer for reducing the thermal crystallization rate.  
     
     
         19 . A preform as in  claim 18  wherein the comonomer is selected from the group consisting of naphthalene dicarboxylic acid, diethylene glycol, isophthalic acid, and 1,4-cyclohexanedimethanol.  
     
     
         20 . A preform as in  claim 1  wherein the poly(ethylene terephthalate) based resin comprises a diacid component having repeat units from terephthalic acid with less than about 5 mole percent modification and a diol component having repeat units from ethylene glycol with less than about 5 mole percent diol modification based on 100 mole percent diacid component and 100 mole percent diol component.  
     
     
         21 . A container made by blow molding the preform of  claim 1 , wherein the container comprises an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion.  
     
     
         22 . A container as in  claim 21  wherein the container is a carbonated soft drink container.  
     
     
         23 . A container comprising an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion and comprising a stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier.  
     
     
         24 . A stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin having an IV of from about 0.65 dL/g to less than about 0.86 dL/g and an impact modifier.  
     
     
         25 . A stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin having an IV of about 0.68 to about 0.76 dL/g and an impact modifier.  
     
     
         26 . A stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier in an amount from about 1 to about 10% by weight of the stress cracking resistant polyester composition.  
     
     
         27 . A stress cracking resistant polyester composition as in  claim 26  wherein the impact modifier is present in an amount from about 3 to about 10% by weight of the stress cracking resistant polyester composition.  
     
     
         28 . A stress cracking resistant polyester composition as in  claim 26  wherein the impact modifier is present in an amount from about 3 to about 6% by weight of the stress cracking resistant polyester composition.  
     
     
         29 . A method for making a stress cracking resistant container comprising blow molding a preform comprising an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion and comprising a stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier.  
     
     
         30 . A method for making a stress cracking resistant preform comprising an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion comprising the step of molding a stress cracking resistant polyester composition comprising poly(ethylene terephthalate) based resin and an impact modifier.  
     
     
         31 . A method for enhancing the stress cracking resistance of a polyester composition comprising blending an impact modifier into poly(ethylene terephthalate) based resin, the impact modifier present in an amount from about 1 to about 15% by weight of the polyester composition.  
     
     
         32 . A method for enhancing the stress cracking resistance of a polyester composition comprising blending an impact modifier into poly(ethylene terephthalate) based resin having an IV of from about 0.65 dL/g to about 0.80 dL/g.  
     
     
         33 . A method of  claim 31  wherein the poly(ethylene terephthalate) based resin has an IV of from about 0.68 to about 0.76 dL/g.

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