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US 2026/0226230 A1Published application
Flame retardant copolymer with one or more non-virgin fossil components and methods of making the same
AssigneeIndorama Ventures Public Company Limited
InventorsJoerg Dahringer, Prashant Desai, Werner Grasser, Nick Carter
Life of this patent
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Abstract
The present invention is directed to a flame retardant recycled PET (rPET) copolymer that incorporates a (BHET) component without using any virgin purified terephthalic acid (PTA), virgin dimethyl terephthalate (DMT) and/or virgin fossil monoethylene glycol (MEG), and compositions created by the method, including polymeric materials, polymeric fibrous materials such as used for manufacture of non-woven fabric and like materials.
Claims20
A flame-retardant recycled PET (rPET) copolymer having
- (i) a carboxyl end group (CEG) content from 8 to 70 mmol/kg, and
- <1.45 weight-% of diethylene glycol (DEG), and
- (iii) a molecular weight corresponding to an intrinsic viscosity (IV) between 0.4 to 1.6 dl/g measured on solutions in dichloroacetic acid at 25° C.
- (vi) said copolymer having a phosphor content of 0.01 to 3 wt. % based on total weight of polymer material,
- (vii) said phosphor content is covalently bonded to the polymer backbone, obtained by mixing and polycondensation of monomeric rBHET material comprising
- (i) at least 75 weight-% of bis(2-hydroxyethyl) terephthalate (BHET), based on the dry weight of the monomeric rBHET material and
- (ii) 0.3 to 8 weight-% of mono(2-hydroxyethyl) terephthalate (MHET), based on the dry weight of the monomeric rBHET material and
- (iii) 1 to 20 weight-% of linear oligomers based on the dry weight of the monomeric rBHET material and,
- (iv) optionally 0.001 to 0.1 weight-% cyclic oligomers, based on the dry weight of the monomeric rBHET material and,
- (v) a carboxyl end group (CEG) content from 8 to 70 mmol/kg, and,
- (vi) a saponification value corresponding to a range from 430 to 450 mg KOH/g and;
- (vii) 0.1 to 2.5 weight-% of diethylene glycol (DEG),
- and phosphorus functional comonomers as defined in Formula (I) and/or Formula (II),
- in which the radicals have the following meaning
- R1 is equal to alkyl, aryl, alkyl-aryl, aryl-alky,
- R2 is equal to —(CH2)x—,
- x being an integer from 1 to 6, preferably x=2
- R3, R4 is equal to H, —(CH2)y—OH, (CH2)z—O—(CH2)zOH,
- y being an integer from 1 to 6,
- z being an integer from 1 to 6.
17 more elements
A flame-retardant recycled PET (rPET) copolymer comprising:
- (i) a carboxyl end group (CEG) content from 15 to 50 mmol/kg, and
- (ii)<1.45 weight-% of diethylene glycol (DEG), and
- (iii) a molecular weight corresponding to an intrinsic viscosity (IV) between 0.4 to 1.6 dl/g measured on solutions in dichloroacetic acid at 25° C.
- (vi) said copolymer having a phosphor content of 0.01 to 3 wt. % based on total weight of polymer material,
- (vii) said phosphor content is covalently bonded to the polymer backbone, obtained by mixing and polycondensation of monomeric rBHET material comprising
- (i) at least 90 weight-% of bis(2-hydroxyethyl) terephthalate (BHET), based on the dry weight of the monomeric rBHET material and,
- (ii) 0.3 to 2.5 weight-% of mono(2-hydroxyethyl) terephthalate (MHET), based on the dry weight of the monomeric rBHET material and
- (iii) 1 to 20 weight-% of linear oligomers based on the dry weight of the monomeric rBHET material and,
- (iv) optionally 0.001 to 0.1 weight-% cyclic oligomers, based on the dry weight of the monomeric rBHET material and,
- (v) a carboxyl end group (CEG) from 15 to 50 mmol/kg, and
- (vi) a saponification value corresponding to a range from 430 to 450 mg KOH/g and;
- (vii) 0.1 to 2.0 weight-% of diethylene glycol (DEG), and phosphorus functional comonomers as defined in Formula (I) and/or Formula (II),
- in which the radicals have the following meaning
- R1 is equal to alkyl, aryl, alkyl-aryl, aryl-alky,
- R2 is equal to —(CH2)x—,
- x being an integer from 1 to 6,
- R3, R4 is equal to H, —(CH2)y—OH, (CH2)z—O—(CH2)zOH,
- y being an integer from 1 to 6, and
- z being an integer from 1 to 6.
16 more elements
Dependencies are inferred from the claim text.