Use of polyester resins for the production of articles having good properties as barriers to water vapor

US6727342B1 · kind B1 · utility

Assignee

• Ministero dell 'Universita'e della Ricerca Scientifica e Technologica · IT

Inventors

• Catia Bastioli · Novara, IT
• Marco Foa' · Novara, IT
• Giandomenico Cella · Novara, IT
• Giovanni Floridi · Novara, IT
• Fernanda Farachi · Campi Salentina, IT
• Tiziana Milizia · Novara, IT

Key dates

• Filing date: Jun 8, 2001
• Grant date: Apr 27, 2004
• Expiry date: Jun 8, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyester resins formed by recurring units X=[O—(CH2)n—OCO—(CH2)m—CO] and/or Y=[O—(CH2)k—CO], where the half-sum of n+m is equal to or greater than 6 and k is a number equal to or greater than 6, or by copolymers comprising units and/or sequences having the formula xi[O—(CH2)ni—OCO—(CH2)mi—CO]; yj[O—(CH2)kj—CO] where: i,j=1-5; ni=2-22; mi=0-20; kj=1=21; (Formula (1)) and xi and yj vary between 0 and 1 and are molar fractions of the various units such that (Formula (2)), are used for the preparation of products in which a permeability to water vapour of less than 350 g×30 &mgr;m/m2 per day, measured at 38° C. and 90% RH and good biodegradability are required.