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US 10,894,253 B2Granted
Pipette with improved readability and toughness
AssigneeCorning Incorporated
InventorsJohn Claude Cadotte, Jr., Cristina Carmela Emphasis King, Venu Krishna Pillai, James Mark Seymour, Kimberly Sue Wayman
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Abstract
A serological pipette has an elongated hollow tubular body having an optical transmission of 40 to 70% over a range of 390 to 700 nm. The pipette body is formed from a polymer composition that includes 5 to 30 wt. % poly(styrene-butadiene-styrene) and 70 to 95 wt. % polystyrene. The tubular body is formed by extrusion at a barrel temperature ranging from 400 to 500 F.
Claims12
A serological pipette comprising:
- an elongated hollow tubular body comprising about 5 to about 30 wt. % poly(styrene-butadiene-styrene) and about 70 to about 95 wt. % polystyrene,
- wherein the elongated hollow tubular body has a transmission of about 45 to about 55% over a range of about 390 to about 700 nm.
A method of making a serological pipette, the method comprising:
- forming a polymer composition into an elongated hollow tubular body,
- wherein the forming comprises extruding the polymer composition,
- wherein the polymer composition comprises about 5 to about 30 wt. % poly(styrene-butadiene-styrene) and about 70 to about 95 wt. % polystyrene and a forming temperature ranges from about 400 to about 500° F., and
- wherein the polymer composition is extruded in an extruder having at least a first zone and a second zone, wherein an extrusion temperature in the first zone is less than about 450° F. and an extrusion temperature in the second zone is greater than about 450° F.
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Dependencies are inferred from the claim text.