STRETCHING MULTILAYER MATERIALS Russian patent published in 2019 - IPC C09J123/10 C09J11/00 C08F210/06 

FIELD: chemistry.

SUBSTANCE: invention relates to multilayer materials and absorbent articles. Described is a hot-melt adhesive composition for stretchable multilayer material, comprising: (a) from 35 to 70 wt. % of (co)polypropylene polymer, in which (i) fusion heat is less than 15 J/g, when measured at heating and cooling at rate of 10 °C/min in accordance with ASTM D3418-12 standard; (ii) content of propylene is more than 50 % of (co)polymer; (b) from 2 to 10 wt. % of wax, in which (i) fusion heat is more than 50 J/g, when measured while heating and cooling at rate of 10 °C/min according to ASTM D3418-12 standard, and (ii) melting peak is more than 100 °C when measured in accordance with ASTM D3418-12; and (c) a tackifying agent; wherein adhesive has (i) accumulation module (G'₄₀) of 5⋅10⁵ up to 5⋅10⁷ Pa at 40 °C, 10 rad/s; (ii) accumulation module (G'₈₀) of 5⋅10³ up to 1⋅10⁷ Pa at 80 °C, 10 rad/s; (iii) loss module (G") making at least 5⋅10⁴ Pa at 40 °C, 10 rad/s; and (iv) density range from 0.75 to 0.90 g/cm³ at 160 °C when measured in accordance with ASTM D1475. Also disclosed is a hot-melt adhesive composition for stretchable multilayer material (embodiments).

EFFECT: technical result is improved operational characteristics.

10 cl, 4 tbl, 7 dwg