Method for processing polyester waste
AssigneePTP Group Ltd.
InventorsViktor Bulgakov, Levan Dadiani, George Javakhishvili
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Abstract
A method for processing polyester wastes, especially used polyester bottles, which comprises shredding, washing, drying and melting the waste mixture to obtain a starting raw material wherein a modifying agent selected from the group comprising a combination of polysiloxane and a plasticizer selected from the group of phthalates, or a combination of silazanes and silanes is added to the shredded and dried waste mixture, the amount of the modifying agent being 4 to 6% by weight, based on the waste mixture.
Claims11
A method for producing a modified polyester from waste processed polyester comprising:
- 1) shredding, washing, and drying waste processed polyester;
- 2) adding a modifying agent mixture consisting essentially of:
- a) 20 to 30% by weight liquid polyhydrosiloxane;
- and
- b) 70 to 80% by weight of a plasticizer selected from the group consisting of dioctylphthalate, dinonylphthalate, and dibutylsebacate;
- wherein the modifying agent mixture is added in an amount of 4% to 6% by weight of the waste processed polyester;
- 3) heating the resulting mixture to obtain a melt;
- and
- 4) recovering a modified polyester.
A method for producing a modified polyester from waste processed polyester comprising:
- 1) shredding, washing and drying waste processed polyester material;
- 2) adding a modifying agent mixture comprising:
- a) 55 to 65% by weight hexamethyldisilazane;
- and
- b) 35 to 45% by weight tetraethoxysilane;
- wherein the modifying agent mixture is added in an amount of 4% to 6% by weight of the waste polyester;
- 3) heating the resulting mixture to obtain a melt;
- and
- 4) recovering a modified polyester.
A method for producing a modified polyester from waste processed polyester comprising:
- 1) shredding, washing, and drying waste processed polyester;
- 2) adding a modifying agent mixture consisting essentially of a) a combination of 20 to 30% by weight polyhydrosiloxane and 70 to 80% by weight of a plasticizer selected from the group consisting of dioctylphthalate, dinonylphthalate, and dibutylsebacate;
- or b) a combination of 55 to 65% by weight hexamethyldisilazane and 35 to 45% by weight tetraethoxysilane;
- wherein the modifying agent mixture is added in an amount of 4% to 6% by weight of the waste processed polyester;
- 3) heating the resulting mixture to obtain a melt;
- and
- 4) recovering a modified polyester.
Dependencies are inferred from the claim text.