C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 3/02 (2006.01) C08J 3/02 (2006.01) C08J 3/18 (2006.01) C08L 1/08 (2006.01) C08L 3/06 (2006.01)
Patent
CA 2342174
The biodegradable heterophase compositions comprise partially or completely destructurized 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 µm and preferably than 0.5 µm 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.
L'invention concerne des compositions hétérophases biodégradables comprenant de l'amidon déstructuré et/ou complexé partiellement ou totalement, un ester de polysaccharide et un plastifiant pour cet ester de polysaccharide. Dans ces compositions, l'ester de polysaccharide constitue la matrice et l'amidon constitue la phase dispersée sous forme de particules ou domaines d'une granulométrie moyenne inférieure à 1 mu m, de préférence inférieure à 0,5 mu m pour au moins 80 % des particules. Les compositions de l'invention renferment également un additif pouvant accroître et maintenir à des valeurs égales ou supérieures à 4 le pH d'une solution obtenue en plaçant les compositions sous forme de granules en contact avec de l'eau, à température ambiante, pendant une heure, en utilisant un rapport granules/eau de 1:10 en poids.
Bastioli Catia
Degli Innocenti Francesco
Lombi Roberto
Nicolini Matteo
Tosin Maurizio
Macrae & Co.
Novamont S.p.a.
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