Use of compositions with polyester resins formed by specified recurring units, sequences or specified copolymers in making articles having excellent water barrier properties

摘要

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.