Use of polyester resins for the production of articles having good properties as barries to water vapour

Use of compositions comprising polyester resins formed by specified recurring units, sequences or specified copolymers in the production of articles having excellent water barrier properties. Use of compositions comprising polyester resins formed by (i) recurring units X = [O-(CH 2) n-OCO-(CH 2) m-C...

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Bibliographische Detailangaben
Hauptverfasser: MARCO FOA, GIOVANNI FLORIDI, TIZIANA MILIZIA, CATIA BASTIOLI, FERNANDA FARACHI, GIANDOMENICO CELLA
Format: Patent
Sprache:eng
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Zusammenfassung:Use of compositions comprising polyester resins formed by specified recurring units, sequences or specified copolymers in the production of articles having excellent water barrier properties. Use of compositions comprising polyester resins formed by (i) recurring units X = [O-(CH 2) n-OCO-(CH 2) m-CO] and/or Y = [O-(CH 2) k-CO]; (ii) copolymers comprising units and/or sequences of formula x i[O-(CH 2) n i-OCO-(CH 2) m i-CO] and/or y j[O-(CH 2) k j-CO]; or (iii) [Image] x i and y j are molar fractions and vary between 0-1 such that formula (iv) applies. [Image] Z = [O-(CH 2) a-OCO-(CH 2) b-C. The resins have mean numeral molecular weights of greater than 10,000. The units or sequences in (i), (ii) or (iii) allows the production of biodegradable articles having a permeability to water vapor of less than 350 g x 30 mu m/m 2> per day at 38[deg]C and 90 % relative humidity. half sum of n and m, k : at least 6; i, j : 1-5; n i2-22; m i0-20; k j1-21; a : 2-3; b : 7-11 An independent claim is also included for products produced from the polyester resins.