Patent ID: 8067492

Claim:
A biodegradable hot-melt adhesive composition, comprising (A) from 30% to 90% by weight with respect to the total weight of the adhesive composition, of (A1) a polycaprolactone homopolymer, (A2) polyesters resulting from the condensation of a carboxylic diacid of formula R 1 —[COOH] 2 in which R 1 represents a linear or cyclic C 2 -C 30 hydrocarbon group, saturated or unsaturated, mono or polyhydroxylated with a diol of formula R 2 [OH] 2 in which R 2 represents a linear, cyclic or polycyclic C 2 -C 32 hydrocarbon group, saturated, unsaturated or polyunsaturated, or mono or polyhydroxylated, or (A3) polycaprolactone (A1) and polyester (A2) copolymers; (B) from 10% to 50% by weight with respect to the total weight of the adhesive composition, an adhesion-promoting agent or tackifier having an average molar mass by weight M w between 300 and 5000, which agent or tackifier is: (i) rosins of natural origin or modified; (ii) terpene resins resulting from the polymerisation of terpene hydrocarbons in the presence of Friedel-Crafts catalysts, optionally modified by the action of phenols; (iii) copolymers based on natural terpenes; (C) from 10% to 30% by weight with respect to the total weight of the adhesive composition of a stiffening agent represented by a wax having a melting point within the range of 40° C. to 150° C., (D) 0% to 20% by weight with respect to the total weight of the adhesive composition of one or more additives that are stabilizers, antioxidants, anti-blocking agents, pigments, colorants or fillers.