C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/02 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08J 5/18 (2006.01) C08L 3/00 (2006.01) C08L 3/02 (2006.01) C08L 67/04 (2006.01) C08L 75/06 (2006.01) C08L 77/00 (2006.01) C08L 77/06 (2006.01) C08L 77/12 (2006.01) C08L 101/00 (2006.01)
Patent
CA 2270362
Polymeric compositions comprising thermoplastic starch and a thermoplastic polymer incompatible with starch, in which the starch constitutes the dispersed phase and the thermoplastic polymer constitutes the continuous phase, selected: A) from compositions comprising an agent with an interfacial effect selected from esters of polyols with mono- or polycarboxylic acids with dissociation constants within certain limits, the esters having specific values of the hydrophilic/lipophilic balance index HLB or being amongst the non-ionic surfactants which are soluble in water but cannot significantly be extracted by water from the compositions which contain them; B) from compositions wherein the thermoplastic polymer is an aliphatic or aliphatic- aromatic copolyester wherein the ratio (R) between the average viscometric molecular weight and the melt index is greater than 25,000 and C) from compositions wherein the thermoplastic polymer is selected from aliphatic- aromatic copolyesters, polyester-amides, polyester-ethers, polyester-ether- amides, polyester-urethanes and polyester-ureas and wherein the compositions are obtained by extrusion of the component maintaining a water content during the mixing stage from 1 to 5 % by weight.
L'invention concerne des compositions polymères contenant de l'amidon thermoplastique et un polymère thermoplastique incompatible avec l'amidon, ce dernier constituant la phase dispersée et le polymère thermoplastique constituant la phase continue. Lesdites compositions sont choisies parmi les compositions suivantes: A) des compositions contenant un agent ayant un effet interfacial, lequel est choisi entre des esters de polyols ayant des acides mono- ou polycarboxyliques présentant des constantes de dissociation dans certaines limites, lesdits esters ayant des valeurs spécifiques relatives au rapport hydrophile/lipophile ou étant des tensioactifs non-ioniques qui sont solubles dans l'eau mais qui ne peuvent pas être significativement extraits par eau des compositions qui les renferment; B) des compositions dans lesquelles le polymère thermoplastique est un copolyester aliphatique ou aliphatique-aromatique pour lequel le rapport (R) entre le poids moléculaire viscométrique moyen et l'indice de fusion est supérieur à 25 000; et C) des compositions dans lesquelles le polymère thermoplastique est choisi parmi des copolyesters aliphatiques-aromatiques, des polyesters-amides, des polyesters-éthers, des polyesters-éthers-amides, des polyesters-uréthanes et des polyesters-urées, les compositions étant obtenues par extrusion du composant gardant une teneur en eau de 1 à 5 % en poids pendant l'étape de mélange.
Bastioli Catia
Bellotti Vittorio
Cella Gian Domenico
Del Giudice Luciano
Montino Sandro
Macrae & Co.
Novamont S.p.a.
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