Abstract: A composition of one or more biodegradable aliphatic and/or aliphatic-aromatic thermoplastic polyesters obtained by reactive extrusion of the polyesters with organic peroxides.

Abstract: The invention relates to a mixture of biodegradable polyesters comprising: (A) a polyhydroxy acid of the poly-?-caprolactone type and its copolymers, (B) aliphatic polyester, and (C) a polymer of polylactic acid, in which the concentration of (A) varies with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of (C) with respects to (A+B+C) lies between 2 and 30%.

Abstract: The invention relates to a mixture of biodegradable polyesters which includes an aromatic-aliphatic polyester (A), an aliphatic polyester (B) and a polyactic acid polymer (C) in which the concentration of A varies, with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of C with respect to (A+B+C) is of between 6 and 30% by weight.

Abstract: The invention relates to a mixture of biodegradable polyesters comprising: (A) a polyhydroxy acid of the poly-&egr;-caprolactone type and its copolymers, (B) aliphatic polyester, and (C) a polymer of polylactic acid, in which the concentration of (A) varies with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of (C) with respects to (A+B+C) lies between 2 and 30%.

Abstract: The biodegradable heterophase compositions comprise partially or completely destructurised and/or complexed starch, a polysaccharide ester and a plasticizer for the polysaccharide ester. In these compositions, the polysaccharide ester constitutes the matrix and the starch the dispersed phase in the form of particles or domains of numeric mean dimension lower than 1 &mgr;m and preferably than 0.5 &mgr;m for at least 80% of the particles. The compositions also comprise an additive which can increase and maintain at values of 4 or more the pH of a solution obtained by placing the compositions in pellet form in contact with water at ambient temperature for 1 hour, with the use of a pellet:water ratio of 1:10 by weight.

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.

Abstract: The invention relates to a mixture of biodegradable polyesters which includes an aromatic-aliphatic polyester (A), an aliphatic polyester (B) and a polylactic add polymer (C) in which the concentration of A varies, with respect to (A+B) in the range between 40 and 70 % by weight, and the concentration of C with respect of (A+B+C) is of between 6 and 30 % by weight.

Abstract: Biodegradable thermoplastic compositions comprising a starch component, a cellulose ester or ether, a plasticizer for the starchy phase and of the cellulose and derivatives, and a compatibilizer agent selected from polymers compatible with the cellulose and or starchy component, grafted with aliphatic or polyhydroxilated chains; copolymers obtained from hydroxy acids and/or diamines with 2-24C and aliphatic or aromatic diisocyanates; copolymers obtained from aliphatic polyesters, polyureas and polyalkylene glycols and aliphatic or aromatic diisocyanates; copolymers obtained from polymers compatible with cellulose ester or ethers and/or the starchy component by grafting starch soluble polyols; polymer capable of complexing starch; starch compatible polyols.

Abstract: The invention relates to a mixture of biodegradable polyesters which includes an aromatic-aliphatic polyester (A), an aliphatic polyester (B) and a polyactic acid polymer (C) in which the concentration of A varies, with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of C with respect to (A+B+C) is of between 6 and 30% by weight.

Abstract: The invention relates to a mixture of biodegradable polyesters comprising: (A) a polyhydroxy acid of the poly-&egr;-caprolactone type and its copolymers, (B) aliphatic polyester, and (C) a polymer of polylactic acid, in which the concentration of (A) varies with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of (C) with respects to (A+B+C) lies between 2 and 30%.

Abstract: A method for increasing the molecular weight of aliphatic polyester resins from dicarboxylic aliphatic acids having 2-22 carbon atoms, or from hydroxy-acids having 2-22 carbon atoms, in which the solid resin is brought into contact with a chain extender preferably chosen from the organic disocyaciates.

Abstract: Heterophasic compositions comprising starch and a thermoplastic polymer that is incompatible with the starch, in which the starch constitutes the discontinuous phase and the thermoplastic polymer the continuous matrix, having an impact strength greater than 30 KJ/m2 (measured on blown film of 30 microns thick at 10° C. and RH less than 5%), and further characterised by the presence in the X-ray diffraction spectrum of a peak at an angle 2-theta from 13 to 14° the ratio of the intensity of which to that of the peak of the amorphous starch which occurs at 20.5°, is less than 2 and greater than 0.02.

Abstract: Heterophasic compositions comprising starch and a thermoplastic polymer that is incompatible with the starch, in which the starch constitutes the discontinuous phase and the thermoplastic polymer the continuous matrix, having an impact strength greater than 30 KJ/m2 (measured on blown film of 30 microns thick at 10° C. and RH less than 5%), and further characterised by the presence in the X-ray diffraction spectrum of a peak at an angle 2-theta from 13 to 14° the ratio of the intensity of which to that of the peak of the amorphous starch which occurs at 20.5°, is less than 2 and greater than 0.02.

Abstract: A polymeric composition comprising a filler melt-dispersed in a matrix comprising, a destructurized starch component; a synthetic thermoplastic polymeric component selected from the group consisting of polyvinylalcohol, polyvinyl acetate, thermoplastic polyesters and graft copolymers of polysaccharides; and a fluidizing agent selected from the group consisting of C12-C22 fatty acids, C12-C22 fatty alcohols, esters and amides of said fatty acids, polyolefin waxes, polyglycol ethers of alditols, polyglycerols esterified with C12-C22 fatty acids, and mixtures thereof, wherein said filler is a mixture of an inorganic filler and a filler of organic nature, wherein the organic filler is present in an amount from 5% to 70% by weight.

Abstract: Materials in the form of foam sheet comprising destructured or complexed starch expanded as a continuous phase, having a density lying between 20 and 150 kg/m3, cell dimensions in the range lying between 25 and 700 &mgr;m and with a cell distribution such that 80% of them have a dimension lying between 20 and 400 &mgr;m in the absence of stretching.

Abstract: Stick with cotton buds for hygienic use, which are disintegrable in water and rapidly biodegradable, manufactured from a thermoplastic material obtained from natural polymeric substances which are biodegradable and water soluble when in their thermoplastic state or from biodegradable, water soluble synthetic polymers.

Abstract: A polymeric composition comprises a matrix including a starch component and at least one synthetic thermoplastics polymeric component in which a filler is dispersed, characterised in that the matrix includes a fluidising agent selected from the group consisting of C.sub.12 -C.sub.22 fatty acids, C.sub.12 -C.sub.22 fatty alcohols, esters and amides of the said fatty acids, poly and polyglycol ethers of alditols or polyglycerols esterified with the said fatty acids and their mixtures and the said filler comprises natural fillers of an organic nature dispersed in the matrix in quantities of from 5% to 70% by weight with reference to the total weight of the composition.

Abstract: A process and device produce fibrous starch materials through extrusion of a dispersion or aqueous solution of starch material in a flow of saline coagulant. The dispersion or aqueous solution is extruded through a microporous tubular wall in an annular chamber surrounding the microporous wall to obtain an extrusion flux of starch material which surrounds the tubular wall. Coagulation of the starch material is carried out by feeding a flow of coagulation agent in the annular chamber parallel to the extrusion surface. The fibers obtained from the process or device are able to be used in the paper sector as a substitution for or in combination with cellulose fibers.

Abstract: Biodegradable foamed articles having density comprised from 5 to 300 kg/m.sup.3 obtained by agglomeration of foamed particles having composition comprising a thermoplastic starchy material or a thermoplastic natural polymer capable of absorbing water when converted into the thermoplastic state, a thermoplastic polymer, and water.

Abstract: Biodegradable foamed plastic material having a bulk density comprised within the range of from 5 to 13 kg/m.sup.3, comprising:30-99.5 by weight of polisaccharide containing more than 50% of thermoplastic starch or starch complexed by polimeric structures, having an intrinsic viscosity (in DMSO) lower than 1.3 dl/g and less than 20% by weight of soluble fraction in ethanol;0.5-70% by weight of a thermoplastic polymer which is soluble in starch, or is capable of complexing it;0-20% by weight of water.The material can be used as a loose filler or for other foamed articles.