Biopolymer composition and its use as a powder coating
AssigneeBrightplus Oy
InventorsMaiju Hietala, Rauna-Leena Kuvaja, Admir Hadzic, Tuire Marin, Jarkko Leivo
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Abstract
The present invention concerns a packaging material having a coating made of a biopolymer composition. In addition, the invention concerns a method for providing barrier properties for a packaging material by using the above mention composition. In particular, the present invention concerns coating of a porous material with a composition comprising a biopolymer formed by the reaction product of biodegradable polyester and siloxane precursor.
Claims20
A packaging material comprising a coated porous substrate, wherein the coated porous substrate comprises a porous substrate and a coating on the porous substrate, the coating comprising a curedQ layer comprising a biopolymer formed by a reaction product of a biodegradable polyester and a metalloxane precursor, and wherein the reaction product forming the biopolymer is formed by an esterification reaction between the biodegradable polyester and the metalloxane precursor.
A method for producing a packaging material comprising the steps of
- providing a porous substrate,
- providing a biodegradable polyester,
- providing a metalloxane precursor,
- reacting the biodegradable polyester with the metalloxane precursor in an esterification
- reaction to form a biopolymer composition,
- pulverizing the biopolymer composition to form a powder,
- applying the powder on the porous substrate, and
- curing the applied powder to form a packaging material.
A packaging material comprising a porous substrate, wherein the porous substrate comprises a coating, the coating comprising a cured layer of a powder composition comprising a biopolymer formed by a reaction product of a biodegradable polyester and a metalloxane precursor, wherein the metalloxane precursor comprises a siloxane precursor, and wherein the molar fraction of the siloxane precursor is 20 to 90 mol-% of the powder composition.
Dependencies are inferred from the claim text.