Lightweight bottles and method for making same
AssigneeEastman Chemical Company
InventorsHarold Blake Sprayberry, Vincent Veret
Life of this patent
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Abstract
The present invention discloses a process comprising forming a preform with planar stretch ratios greater than about 14 from a polyester having a natural stretch ratio which is substantially matched to the preform planar stretch ratio at processing conditions; and stretch blow molding said preform to produce a container. Suitable natural stretch ratios include those greater than about 13 at 210.degree. F. The desired natural stretch ratios and desirable final container properties are achieved by balancing the appropriate I.V. and copolymer modification.
Claims29
A process comprising forming a preform with a planar stretch ratio greater than about 14 from a polyester having a natural stretch ratio which is substantially matched to the preform planar stretch ratio at processing conditions;
- and stretch blow molding said preform at said planar stretch ratio to produce a lightweight container.
A lightweight container comprising a polyester having a natural stretch ratio of at least about 13 at 210.degree. F.
A process comprising forming a preform with a planar stretch ratio greater than about 14 from a polyester having an I.V. of less than about 0.75 dL/g and a natural stretch ratio which is substantially matched to the preform planar stretch ratio at processing conditions;
- and stretch blow molding said preform at said planar stretch to produce a container.
A process comprising forming a preform with a planar stretch ratio of about 14 to about 15.5 from a polyester having a natural stretch ratio which is substantially matched to the preform planar stretch ratio at processing conditions;
- and stretch blow molding said preform at said planar stretch ratio to produce a container.
Dependencies are inferred from the claim text.