Polyesters containing an infrared absorbing material

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/02 (2006.01) C08J 3/205 (2006.01) C08J 3/22 (2006.01) C08J 5/00 (2006.01) C08K 3/04 (2006.01)

Patent

CA 2330962

Polyesters are disclosed which contain an infrared absorbing material comprising graphite, wherein said polyester is made by the reaction of one or more dicarboxylic acids having from 8 to 40 carbon atoms, or esters thereof, with one of more diols having from 2 to 8 carbon atoms and/or glycol ethers having from 4 to 10 carbon atoms, wherien said graphite is present from 0.1 to 15 parts by weight per million by weight of said polyester and has an average particle size of from 0.1 to 20 µm, and wherein said polyester has a Hunter a* coordinate value of from -2.0 to +2.0, a Hunter b* coordinate value of from -3.0 to +2.0, and a Hunter L* value of greater than 65 or wherien said polyester is a moulded preform article, having a Hunter a* coordinate value of from -3.0 to +3.0, a Hunter b* coordinate value of from -5.0 to +7.0, and a Hunter L* value of greater than 65, as measured on a moulded bottle preform having a sidewall corss-sectional thickness of about 3.175 mm (0.125 inch). In another embodiment of the invention preformed articles or beverage bottles made of said polyesters are disclosed.

Ces polyesters contenant une substance absorbant dans l'infrarouge comprenant du graphite sont produits grâce à la réaction d'un ou de plusieurs acides dicarboxyliques portant de 8 à 40 atomes de carbone, ou de leurs esters, avec un ou plusieurs diols portant de 2 à 8 atomes de carbone et/ou des éthers glycoliques portant de 4 à 10 atomes de carbone. La quantité de graphite présent est comprise entre 0,1 et 15 parties par mg/kg dudit polyester, la dimension moyenne des particules s'échelonne de 0,1 à 20 mu m, la valeur de coordonnée Hunter a* de ce polyester est comprise entre 2,0 à +2,0, la valeur de coordonnée Hunter b* est comprise entre 3,0 à +2,0, la valeur de coordonnée Hunter b* est comprise entre 3,0 à +2,0, et la valeur de coordonnée Hunter L* est supérieure à 65. Ledit polyester peut également consister en une ébauche moulée dont la valeur de cordonnée Hunter a* est comprise entre 3,0 et +3,0, la valeur de coordonnée Hunter b* entre 5,0 et +7,0 et la valeur de coordonnée Hunter L supérieure à 65, comme mesuré sur une ébauche de bouteille moulée dont l'épaisseur transversale de paroi latérale est d'environ 3,175 mm (0,125 pouce). Un autre aspect de l'invention porte sur des ébauches de bouteilles à boisson ou d'articles réalisés avec ces polyesters.

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