Hydroquinone-containing polyesters having improved whiteness

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/60 (2006.01) C08G 63/78 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2739028

A polyester contain-ing polymerized units of hydro-quinone; 4,4'-biphenol; and hydrox-ybenzoic acid; terephthalic acid and optionally isophthalic acid. A method of forming a polyester in-cluding first acylating a mixture of hydroquinone; 4,4'-biphenol; tereph-thalic acid and optionally isophthalic acid; and hydroxybenzoic acid; and then polycondensing the resulting acylated mixture. The polyester is suitable for uses such as lighting where high whiteness, high reflectiv-ity and high heat resistance are desir-able.

L'invention porte sur un polyester contenant des unités polymérisées d'hydroquinone; de 4,4'-bisphénol; et d'acide hydroxybenzoïque; d'acide téréphtalique et, facultativement, d'acide isophtalique. L'invention porte également sur un procédé de formation d'un polyester comprenant d'abord l'acylation d'un mélange d'hydroquinone; de 4,4'-bisphénol; d'acide téréphtalique et, facultativement, d'acide isophtalique; et d'acide hydroxybenzoïque; puis la polycondensation du mélange acylé ainsi obtenu. Le polyester est approprié pour des utilisations telles que l'éclairage où une grande blancheur, une réflectivité élevée et une résistance à la chaleur élevée sont souhaitables.

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