Manufacturing method of medical textiles woven from chitosan containing high wet modulus rayon fibre

• US 8,899,277 B2
• Filed: 08/03/2012
• Issued: 12/02/2014
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: G2 Innovative Medhealth, Inc., Shin Era Technology Co., Ltd.
• Original Assignee: Shin Era Technology Co., Ltd.
• Inventors: Chiu, Ming Houng, Hong, Ming Shuen, Chiu, Chi Ming, Hung, Tang Chin
• Primary Examiner(s): Muromoto, Jr., Bobby
• Application Number:
  US13/566,550
• Publication Number:
  US 20140034181A1
• Time in Patent Office: 851 Days
• Field of Search: 139/383.R, 139/420.R, 139/420.A, 139/426.R, 139/420.B, 264/176.1, 264/204, 264/205, 264/207, 264/210, 264/210.1, 264/210.2, 264/210.3, 264/211.12, 264/211.13, 264/211.15, 264/211.16, 264/211.18, 264/211.19, 264/211.2
• US Class Current: 139/426.R
• CPC Class Codes: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: C08L 5/08 Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
• CPC Class Codes: D01F 2/08 Composition of the spinning solution or the bath
• CPC Class Codes: D01F 9/00 Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
• CPC Class Codes: D02G 3/449 Yarns or threads with antibacterial properties filaments containing agents inhibiting growth of microorganisms D01F1/103
• CPC Class Codes: D10B 2201/24 Viscose

Abstract

An anti-“Methicillin-Resistant Staphylococcus Aureus (MRSA)” chitosan containing antibacterial High Wet Modulus (HWM) rayon fiber textile for medical usage is made of the steps as following: chitin flakes made from natural shrimp or crab shells are deacetylated to generate chitosan with a high deacetylation degree of 90% or more. Next chitosan is dissolved in acetic acid and regenerated by caustic soda to form a chitosan antibacterial nanoparticles slurry, then added to HWM viscose rayon process, and spinning to produce a chitosan containing antibacterial HWM rayon fiber. The antibacterial amino groups of chitosan and the hydroxyl groups of rayon cellulose combine together via hydrogen bonding. Therefore, the fiber becomes the anti-MRSA antibacterial HWM rayon fiber containing amino groups (—NH3+). Finally the resulting HWM rayon fiber is conducted via a yarn spinning or/and weaving process to procure a medical textile with chitosan content.

Claims

1. A process to produce a medical textile woven from a chitosan containing HWM (High Wet Modulus) rayon fibre, characterized by the steps as follow:

(1) impregnating chitin flakes obtained from natural shrimp or crab shells with 30˜

48% by weight of NaOH solution at temperature of 40˜

95°

C.;

(2) generating a chitosan with a deacetylation degree of more than 90% via a deacetylation processing;

(3) dissolving said chitosan into 10% by weight of acetic acid;

(4) generating a nanominiaturized chitosan with 1-5% by weight of caustic soda, wherein said nanominiaturized chitosan having an average particle size of 100-600 nm;

(5) generating an antibacterial agent slurry with said nanominiaturized chitosan;

(6) evenly mixing said antibacterial agent slurry with an HWM rayon viscose to obtain a first mixture, wherein said HWM rayon viscose is derived from wood pulp through a high alkalinity condition and with a high degree of polymerization;

(7) contacting said first mixture with a spin bath under a low acidity and low temperature condition for neutralization;

(8) combing amino groups of said nanominiaturized chitosan in said first mixture with hydroxyl groups of a rayon cellulose in said HWM rayon viscose via hydrogen bonds, wherein said amino groups are antibacterial functional groups;

(9) generating an HWM antibacterial fibre containing positively charged amino groups (—

NH₃^+);

(10) making a yarn through a spinning process and/or weaving program; and

(11) obtaining an anti-MRSA (Methicillin-Resistant Staphylococcus aureus) textile.

2. The process to produce a medical textile woven from a chitosan containing HWM rayon fibre according to claim 1, wherein a net chitosan content in the said anti-MRSA textile medical textile is more than 0.4% by weight.