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US 2021/0324151 A1Published application
Active yarns and textiles for the stabilization and controlled release of active compounds
AssigneesMATERIAS S.r.l., Nano Active Film S.R.L.
InventorsAntonietta COZZOLINO, Christophe DANIEL, Gaetano GUERRA, Paola RIZZO, Luigi NICOLAIS
Life of this patent
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Abstract
The present invention regards yarns comprising at least 1% by weight of fibre of a syndiotactic polystyrene containing a co-crystalline phase comprising at least one active guest compound, textiles comprising the aforementioned yarns and methods for preparing the same.
Claims19
1:
- Yarn comprising at least 1% by weight of fibres of a syndiotactic polystyrene containing a co-crystalline phase comprising at least one active guest compound and characterised by a X-ray diffraction (CuKα) pattern comprising peaks having maxima at about 2θ:
- between 9.5° and 9.8°, between 16.3° and 16.6°, between 19.7° and 20°.
2:
- Yarn according to claim 1 wherein said active compound has anti-microbial, pharmacological, cosmetic activity or is capable of conferring to the textile an aesthetic or appeal characteristic.
3:
- Yarn according to claim 1, wherein said active compound has a molecular volume smaller than 0.4 nm3.
4:
- Yarn according to claim 1, wherein said active compound also has an acid dissociation constant pKa>8, basic dissociation constant pKb>8, relative dielectric constant <20 and absence of solvent capacity with respect to syndiotactic polystyrene at temperatures below 100° C.
5:
- Yarn according to claim 1, wherein said active compound is contained in the syndiotactic polymer in an amount greater than 1% by weight, with respect to the total weight of the polymer and/or active guest compound is contained in the syndiotactic polymer in an amount comprised between 5 and 50%.
6:
- Yarn according to claim 1, comprising fibres of said syndiotactic polystyrene at an amount comprised between 1 and 100% by weight, with respect to the total weight of the yarn and natural and/or synthetic textile fibres at an amount between 0 and 99% by weight, with respect to the total weight of the yarn.
7:
- Yarn according to claim 1, comprising fibres of said syndiotactic polystyrene and one or more natural and/or synthetic textile fibres.
8:
- Yarn according to claim 1, whose fibres consist in fibres of said syndiotactic polystyrene.
9:
- A textile comprising a yarn according to claim 1 and wherein said fibres of syndiotactic polystyrene constitute at least 1% by weight of the textile.
10:
- A method for obtaining a yarn according to claim 1, comprising the following stages:
- a) providing a fibre, preferably a flock or filament, of syndiotactic polystyrene in amorphous phase;
- b) providing a liquid suitable to form a co-crystalline phase in the syndiotactic polystyrene comprising an active compound having a molecular volume smaller than 0.4 nm3 and immersing the fibre of stage a), in said liquid;
- c) maintaining said fibre immersed in said liquid for a time sufficient to form a co-crystalline phase with the active compound contained therein;
- d) removing the fibre from the liquid and drying in air;
- e) performing a textile spinning of one or more fibres obtained in stage c) and, optionally, one or more natural and/or synthetic fibres to obtain a yarn.
3 more elements
11:
- A method for obtaining a yarn according to claim 1, comprising the following stages:
- a′) providing a fibre, preferably a flock or filament, of syndiotactic polystyrene in amorphous phase;
- b′) performing a textile spinning of one or more fibres of stage a) and, optionally, one or more natural and/or synthetic fibres to obtain a yarn;
- c′) providing a liquid suitable to form a co-crystalline phase in the syndiotactic polystyrene comprising an active compound having a molecular volume smaller than 0.4 nm3 and immersing the yarn obtained in stage b′), in said liquid;
- d′) maintaining said yarn immersed in said liquid for a time sufficient to form a co-crystalline phase with the active compound contained therein;
- e′) removing the yarn from the liquid and drying in air.
3 more elements
12:
- A method for producing a textile, consisting in the weaving of a yarn according to claim 1.
13:
- A method for producing a textile according to claim 9, comprising the following stages:
- a″) obtaining a textile by weaving a yarn comprising a syndiotactic polystyrene fibres in amorphous phase;
- b″) providing a liquid suitable to form a co-crystalline phase in the syndiotactic polystyrene comprising an active compound having a molecular volume smaller than 0.4 nm3 and immersing the textile obtained in stage a″) in said liquid for a period sufficient to form a co-crystalline phase with the active compound contained therein;
- c″) removing the textile from the liquid and drying in air.
1 more element
14:
- Syndiotactic polystyrene containing a co-crystalline phase comprising at least one active guest compound having and characterised by a X-ray diffraction (CuKα) pattern comprising peaks having maxima at about 2θ:
- between 9.5° and 9.8°, between 16.3° and 16.6°, between 19.7° and 20°, wherein said active guest compound is an unstable compound, preferably a compound susceptible to oxidation in air.
15:
- A method for restoring the amount of active compound in a yarn or textile according to claim 1, wherein said yarn or textile are immersed for a period of time that varies from 30 seconds to 24 hours, preferably between 2 minutes and 1 hour, even more preferably between 5 and 10 minutes in a liquid composition comprising said active compound in concentration comprised between 0.1% and 40% by weight, in water or alcohol.
16:
- Yarn according to claim 1 wherein said active compound is selected from the group consisting of acetylsalicylic acid, isoniazid, methazolamide, metronidazole, sulfacetamide, butylated hydroxyanisole, decanoic acid, butyl acetate, diacetyl, diallyl disulfide, ethyl acetate, guaiacol, linalool, anethole, camphor, carvacrol, carvone, coumarin, eugenol, hexanal, tyrosol, geraniol, isoprenol, limonene, menthol, myrcene, caffeic acid, cinnamic acid, catechol, pyrogallol, thymol, and mixtures thereof.
17:
- Yarn according to claim 1, wherein said active compound is contained in the syndiotactic polymer in an amount greater than 5% by weight, with respect to the total weight of the polymer and/or active guest compound is contained in the syndiotactic polymer in an amount comprised between 10 and 30%.
18:
- Yarn according to claim 1, comprising fibres of said syndiotactic polystyrene at an amount comprised between 5 and 100% by weight, with respect to the total weight of the yarn and natural and/or synthetic textile fibres at an amount between 0 and 95% by weight, with respect to the total weight of the yarn.
19:
- Yarn according to claim 1, comprising fibres of said syndiotactic polystyrene at an amount comprised between 20 and 100% by weight, with respect to the total weight of the yarn and natural and/or synthetic textile fibres at an amount between 0 and 80% by weight, with respect to the total weight of the yarn.