Ethylene terephthalate/ethylene-2,6-naphthalene-dicarboxylate copolymers for bottles
AssigneeTeijin Limited
InventorsMasami Umeda, Kimihiko Sato, Minoru Suzuki
Life of this patent
Estimating the term…
Abstract
An ethylene terephthalate/ethylene-2,6-naphthalene dicarboxylate copolymer comprising 2,6-naphthalenedicarboxylic acid in an amount of 5 to 20 mol % of the total of all dicarboxylic acid components. This copolymer contains Mn, Mg and Co derived from catalysts and P derived from a phosphorus compound as a stabilizer whose amount is controlled to a specific value and is suitable for use as a raw material for molding a bottle having good color (achromatic) and transparency.
Claims10
An ethylene terephthalate/ethylene-2,6-naphthalene dicarboxylate copolymer for bottle which comprises terephthalic acid and 2,6-naphthalenedicarboxylic acid as main dicarboxylic acid components and ethylene glycol as a main glycol component, wherein
- the molar ratio of the terephthalic acid component to the 2,6-naphthalenedicarboxylic acid component is 80/20 to 95/5, and manganese, magnesium, phosphorus, and optionally cobalt, are contained in such amounts that satisfy the following expressions (1) to (5):
- 0.ltoreq.Mn.ltoreq.40 (1)
- 0.ltoreq.Mg.ltoreq.80 (2)
- 0<Co.ltoreq.5 (3)
- 15.ltoreq.Mn+1/2 Mg.ltoreq.40 (4)
- 0.8.ltoreq.P/(Mn+Mg+Co).ltoreq.1.5 (5)
- wherein Mn is a proportion (mmol %) of manganese based on the total of all dicarboxylic acid components constituting the copolymer, Mg is a proportion (mmol %) of magnesium based on the total of all dicarboxylic acid components, Co is a proportion (mmol %) of cobalt based on the total of all dicarboxylic acid components, and P is a proportion (mmol %) of phosphorus based on the total of all dicarboxylic acid components.
Dependencies are inferred from the claim text.