Fiber suitable for packaging and storing plant produce

Patent metadata

Field	Value
Publication number	US-9938658-B2
Application number	US-201414913533-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jul 22, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

The present disclosure relates to a fiber suitable for packaging. The fiber of the present disclosure comprises a photocatalyst bonded to it by means of a first functional group generated by a surface modifying agent and optionally, a second functional group generated by a silicon containing linker. The chemical bonding between the fiber and the photocatalyst imparts durability and wash ability to the fiber. A packaging material prepared using the fiber of the present disclosure can be used for the storage of plant produce.

First claim

The invention claimed is:

1. A fiber suitable for packaging; said fiber comprising a photocatalyst bonded to it by means of a first functional group generated by a surface modifying agent; and optionally, a second functional group generated by a silicon containing linker, wherein the photocatalyst is at least one selected from the group consisting of titanium iso-propoxide, zinc oxide, metal doped titania and non-metal doped titania,
wherein the photo-catalyst is embedded in at least one adsorbent substrate, and wherein the particle size of the at least one adsorbent substrate ranges between of 0.1 nm and 150 nm.

2. The fiber as claimed in claim 1 , wherein the fiber is natural fiber of plant material selected from the group consisting of cotton, jute and cellulosic material; or the fiber is synthetic fiber of polymeric material.

3. The fiber as claimed in claim 1 , wherein the fiber is polyester fiber.

4. The fiber as claimed in claim 1 , wherein the metal doped titania comprises at least one metal selected from the group consisting bismuth, cerium, lanthanum, iron and zinc; and the non-metal doped titania comprises at least one non-metal selected from the group consisting of nitrogen and sulfur.

5. The fiber as claimed in claim 1 , wherein the adsorbent substrate is at least one selected from the group consisting of Ag exchanged ZSM 5 zeolite, zeolite A, alumina and silica.

6. The fiber as claimed in claim 1 , wherein the surface modifying agent is at least one selected from the group consisting of lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), rubidium hydroxide (RbOH), cesium hydroxide (CsOH), potassium persulphate (K 2 S 2 O 8 ) and sodium persulphate (Na 2 S 2 O 8 ).

7. The fiber as claimed in claim 1 , wherein the bond between the fiber and the photo-catalyst is at least one bond from the group consisting of covalent, ionic, hydrogen, zwitterion, electron-pair, van der waals forces and pi bond interaction.

8. The fiber as claimed in claim 1 , wherein the silicon containing linker is at least one selected from the group consisting of tetramethyl ortho silicate, trimethoxy silane, tetraethyl orthosilicate, triethoxy silane, methyl-dimethoxy silane, methyl-diethoxy silane, methyl-trimethoxy silane, cyclohexyl triethoxy silane, methyl-triethoxy silane, methyl-tripropoxy silane, methyl-tributoxysilane, propyl-trimethoxy silane, propyl-triethoxy silane, allyl-triethoxy silane, n-butyl trimethoxy silane, n-butyl triethoxy silane, i-butyl-trimethoxy silane, i-butyl-triethoxy silane, dodecyl-trimethoxy silane.

9. A process for preparing the fiber suitable for packaging as claimed in claim 1 , said process comprising the following steps:
a. contacting a fiber with at least one surface modifying agent at a temperature of 30° C. to 100° C., for a time period of 15 min. to 5 hrs. followed by washing and drying to obtain a functionalized fiber; and
b. refluxing the functionalized fiber with a mixture comprising the photocatalyst, at least one solvent and optionally, a silicon containing linker at a temperature ranging between 40° C. and 90° C., followed by washing, and drying to obtain the fiber suitable for packaging.

10. The process as claimed in claim 9 , wherein the fiber is natural fiber of plant material selected from the group consisting of cotton, jute and cellulosic material; or the fiber is synthetic fiber of polymeric material.

11. The process as claimed in claim 9 , wherein the fiber is polyester fiber.

12. The process as claimed in claim 9 , wherein the surface modifying agent is at least one selected from the group consisting of lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), rubidium hydroxide (RbOH), cesium hydroxide (CsOH), potassium persulphate (K 2 S 2 O 8 ) and sodium persulphate (Na 2 S 2 O 8 ).

13. The process as claimed in claim 9 , wherein the proportion of silicon containing linker to the photocatalyst is in the range of 1:1 and 300:1.

14. The process as claimed in claim 9 , wherein the metal doped titania comprises at least one metal selected from the group consisting bismuth, cerium, lanthanum, iron and zinc; and the non-metal doped titania comprises at least one non-metal selected from the group consisting of nitrogen and sulfur.

15. The process as claimed in claim 9 , wherein the photo-catalyst is embedded in adsorbent substrate and said photocatalyst is obtained by a method comprising the following steps:
i. treating at least one adsorbent substrate with a mixture comprising at least one vehicle and at least one photocatalyst under stirring for a time period of 30 min to 5 hrs to obtain slurry; wherein, the proportion of the adsorbent substrate to the mixture is in the range of 5:1 to 50:1
ii. drying the slurry at a temperature of 50° C. to 200° C. for a time period of 30 min to 5 hrs. to obtain an un-hydrolyzed photocatalyst embedded in adsorbent substrate;
iii. hydrolyzing the un-hydrolyzed photocatalyst embedded in adsorbent substrate with water to obtain a hydrolyzed photocatalyst embedded in adsorbent substrate; and
iv. drying and calcining the hydrolyzed photocatalyst embedded in adsorbent substrate to obtain a photocatalyst embedded in adsorbent substrate.

16. The process as claimed in claim 15 , wherein the metal doped titania comprises at least one metal selected from the group consisting bismuth, cerium, lanthanum, iron and zinc; and the non-metal doped titania comprises at least one non-metal selected from the group consisting of nitrogen and sulfur.

17. The process as claimed in claim 15 , wherein the adsorbent substrate is at least one selected from the group consisting of Ag exchanged ZSM 5 zeolite, zeolite A, alumina and silica; and wherein the particle size of the adsorbent substrate ranges between of 0.1 nm and 150 nm.

18. A packaging material prepared using the fiber as claimed in claim 1 .

Assignees

• Reliance Industries Ltd

Inventors

• Sidhpuria Kalpeshkumar
• Kumar Prakash
• Krishnamurthy Gurudatt
• Dehade Shashank
• SARKAR Sudip Kumar
• Jasra Raksh Vir

Classifications

• D06M13/507

  Organic silicon compounds without carbon-silicon bond · CPC title

• D06M2400/01

  Creating covalent bondings between the treating agent and the fibre · CPC title

• B01D2255/802

  Photocatalytic · CPC title

• B01D2255/504

  ZSM 5 zeolites · CPC title

• B01J23/06

  of zinc, cadmium or mercury · CPC title