Compostable multilayer structures and articles prepared...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 5/18 (2006.01) B32B 27/08 (2006.01)

Patent

CA 2230944

A compostable multilayer structure is provided by the present invention. The multilayer structure can be in the form of a film, sheet, laminate, and the like, and includes a core layer (12) having a first surface (13) and a second surface (15), a first blocking reducing layer (14) covering the first surface of the core layer, and a second blocking reducing layer (16) covering the second surface of the core layer. The core layer includes a polymer composition of a hydrolyzable polymer containing a lactic acid residue and has a glass transition temperature (Tg) below about 20 deg. C. The first and second blocking reducing layers include a polymer composition of a hydrolyzable polymer and have a Tg above about 50 deg. C. The multilayer structure can be used for preparing bags and wrappers.

L'invention concerne une structure à couches multiples se prêtant au compostage. La structure à couches multiples peut se présenter sous la forme d'un film, d'une feuille, d'un stratifié et similaire et elle comporte une couche centrale (12) ayant une première surface (13) et une seconde surface (15), une première couche anti-blocage (14) couvrant la première surface de la couche centrale et une seconde couche anti-blocage (16) couvrant la seconde surface de la couche centrale. La couche centrale comprend une composition polymère d'un polymère hydrolysable contenant des groupes acide lactique et ayant une température de transition vitreuse (Tg) inférieure à 20 ·C environ. Les première et seconde couches anti-blocage contiennent une composition polymère d'un polymère hydrolysable et elles ont une température Tg au-dessus de 50 ·C environ. Cette structure à couches multiples peut être utilisée pour préparer des sacs et des emballages.

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