Teknologian Tutkimuskeskus Vtt Oy

Pia Willberg-Keyriläinen

Jarmo Ropponen

Ali Harlin

Riku Talja

Kirsi Immonen

Eino Sivonen

Thomas Gädda

Leena Nurmi

Jari Vartiainen

Jun Shan

Mika Härkönen

Harri Heikkinen

Virpi Rämö

Sini Metsä-Kortelainen

Sari Asikainen

Thomas GÄDDA

The present invention relates to a thermoplastic cellulose composite for additive manufacturing. The composite comprises at least 50 weight-% of total cellulose, a plasticizer, and a coupling agent of an epoxy-modified polyunsaturated fatty acid. The material is fully bio-based and offers improved cellulose content and thermal resistance compared to existing bio-based thermoplastic materials used in additive manufacturing.

Use of thermoplastic cellulose composite for additive manufacturing

According to an example aspect of the present invention, there is provided a use of molar mass controlled cellulose in injection molding, extrusion and three dimensional printing applications.

Use of molar mass controlled cellulose

The present invention relates to a method for preparation a glycolide polyester by ring opening polymerization characterized in that glycolide monomer with optional co-monomer(s) of cyclic ester(s) is/are subjected to ring opening polymerization in the presence of a dispersion stabilizer and a catalyst, said catalyst being selected for precipitating glycolide homopolymer or copolymer from solvent, said solvent being selected so that the glycolide monomer and the optional co-monomer(s), the dispersion stabilizer and the catalyst are soluble therein but said glycolide homopolymer or copolymer is non-soluble. The present invention further relates to an in situ ring opening polymerizing process product, and to use of said glycolide polyester, and to further processing of said glycolide polyester.

Method for preparing glycolide polyester by ring opening polymerization

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Vtt, Finland

Pia Willberg-Keyriläinen