Nucleating agents for polyhydroxyalkanoates

Details Nucleating agents for polyhydroxyalkanoates Nucleating agents for polyhydroxyalkanoates

C - Chemistry, Metallurgy

08

K

C08K 5/20 (2006.01) C08K 5/21 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2580603

The present invention provides a process for crystallizing a polymer having at least 20 mole percent of hydroxyalkanoate repeat units, comprising admixing the polymer and a compound of the formula R1-C(O)N(R2)2, R1-C(O)NH-(R3)-NHC(O)- R1, R1-NHC(O)NH-(R3)-NHC(O)NH-R1, R1-NHC(O)-R2, R1-NHC(O)-(R3)-C(O)NH-R1, R1- C(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-NHC(O)-R1, or a combination thereof, at a first temperature, which is from about 5~C to about 15~C above the melting point of the polymer; and cooling the polymer at a second temperature, which is from about the glass transition temperature of the polymer to about the melting point of the compound. The present invention also provides a composition comprising a polymer having at least about 20 mole percent of hydroxyalkanoate repeat units, and a compound of the formula R1- C(O)N(R2)2, R1-C(O)NH-(R3)-NHC(O)-R1, R1-NHC(O)NH-(R3)-NHC(O)NH-R1, R1-NHC(O)- R2, R1-NHC(O)-(R3)-C(O)NH-R1, R1-C(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)- C(O)NH-R1, R1-NHC(O)NH-(R3)-NHC(O)-R1, or a combination thereof.

La présente invention concerne un procédé de cristallisation d'un polymère possédant au moins 20 % molaire d'unités de répétition d'hydroxyalkanoate. Ledit procédé consiste à mélanger le polymère avec un composé de formule R1-C(O)N(R2)2, R1-C(O)NH-(R3)-NHC(O)-R1, R1-NHC(O)NH-(R3)-NHC(O)NH-R1, R1-NHC(O)-R2, R1-NHC(O)-(R3)-C(O)NH-R1, R1-C(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-NHC(O)-R1, ou un mélange correspondant, à une première température comprise entre environ 5 °C et environ 15 °C au-dessus du point de fusion du polymère, et à refroidir le polymère à une seconde température qui se situe entre environ la température de transition vitreuse du polymère et environ le point de fusion du composé. Cette invention a aussi pour objet une composition renfermant un polymère possédant au moins environ 20 % molaire d'unités de répétition d'hydroxyalkanoate et un composé de formule R1-C(O)N(R2)2, R1-C(O)NH-(R3)-NHC(O)-R1, R1-NHC(O)NH-(R3)-NHC(O)NH-R1, R1-NHC(O)-R2, R1-NHC(O)-(R3)-C(O)NH-R1, R1-C(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-C(O)NH-R1, R1-NHC(O)NH-(R3)-NHC(O)-R1, ou un mélange associé.

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