Title of Invention	"A PROCESS OF SEQUENTIAL BIO DEGRADATION FOR PREFERENTIAL DEGRADATION OF AMORPHOUS ZONES OF ARAMID FIBERS"
Abstract	"A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers" A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described.

Title of Invention

"A PROCESS OF SEQUENTIAL BIO DEGRADATION FOR PREFERENTIAL DEGRADATION OF AMORPHOUS ZONES OF ARAMID FIBERS"

Abstract

"A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers" A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described.

Full Text	A PROCESS FOR DEGRADATION OF ARAMID FIBERS (FIELD OF INVENTION) This invention relates to a process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers. (Prior Art) Aramid fibres consisting of aromatic polyamides having amide linkages are having exceptional heat and flame resistance, high tensile strength and modulus. They are widely used as ropes, tyre cords, belts and for reinforcement of resins such as FRP & FRTP. The aramid composites are widely used in numerous aerospace applications in tactical aircraft, helicopters space stations and rocket motor casings. For these high performance applications structural homogenity in the fiber batch is very essential. For the determination of structural heleogenicity in aramid fibres various methods viz. X-ray diffraction, acid and alkaly degradation and microscopy, Ultra Volent and Infra Red spectroscopy are used. These methods provide only limited information of aramid fiber structures and do not resolve and differentiate the aramid fiber structural. The acid or alkaly degradation process do not differentiate the fibrillated and non fibralated fibers. Selective degradation of amorphous region of aramid fiber is not possible by acid as alkaly degradation processes. OBJECT OF THE PRESENT INVENTION The present invention envisages a novel sequential biodegradation process for detection of structural heterogenicity of aramid fibers. Accordingly a primary object of the present invention is to process a novel sequential biodegradation process for detection of macromolecular fiber structures. STATEMENT OF INVENTION According to this invention there is provided a process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described. The method of sequential degradation of aramid fibres by bacterial culture JP-3 product has definite advantages over acid and alkaly degradatin in preferential degradation of amorphous structures and slow sequential degradation from outer skin layer to the central core region. The invention is illustrated but not limited by the following examples. Example; The bacterial culture JP-3 was grown in sterilized complex organic medium containing 0.5% yeast extract, 1% wool fibres in tap water, in 250 ml. Conical flask at 37°C for 2 days on rotary shaker at 220 rpm. The content was filtered aseptically to separate the undigested wool fibres and 0.5% sterile Kevlar 29, or 49 or 149 or Technora T-240 aramid fibres were added and further incubated at 37°C on rotary shaker for 3 to 5 days. Partially degraded aramid fibres were collected at 12 hours intervals. The biodegraded fibres have more reactive surface and microfibreils protuding from the surface. Two distinct fiber structure i.e. fibrillated and nonfibrillated were clearly differentiated after the process. I CLAIM 1. A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described. 2. A process as claimed in claim 1 wherein the step of growth is carried out by stirring slowly preparably on rotory shaker. 3. A process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers substantially as herein described and illustrated in the examples.

Full Text

A PROCESS FOR DEGRADATION OF ARAMID FIBERS
(FIELD OF INVENTION)
This invention relates to a process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers.
(Prior Art)
Aramid fibres consisting of aromatic polyamides having amide linkages are having exceptional heat and flame resistance, high tensile strength and modulus. They are widely used as ropes, tyre cords, belts and for reinforcement of resins such as FRP & FRTP. The aramid composites are widely used in numerous aerospace applications in tactical aircraft, helicopters space stations and rocket motor casings. For these high performance applications structural homogenity in the fiber batch is very essential. For the determination of structural heleogenicity in aramid fibres various methods viz. X-ray diffraction, acid and alkaly degradation and microscopy, Ultra Volent and Infra Red spectroscopy are used. These methods provide only limited information of aramid fiber structures and do not resolve and differentiate the aramid fiber structural.
The acid or alkaly degradation process do not differentiate the fibrillated and non fibralated fibers. Selective degradation of
amorphous region of aramid fiber is not possible by acid as alkaly degradation processes.
OBJECT OF THE PRESENT INVENTION
The present invention envisages a novel sequential biodegradation process for detection of structural heterogenicity of aramid fibers.
Accordingly a primary object of the present invention is to process a novel sequential biodegradation process for detection of macromolecular fiber structures.
STATEMENT OF INVENTION
According to this invention there is provided a process of sequential bio degradation for preferential degradation of amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described.

The method of sequential degradation of aramid fibres by bacterial culture JP-3 product has definite advantages over acid and alkaly degradatin in preferential degradation of amorphous structures and slow sequential degradation from outer skin layer to the central core region.
The invention is illustrated but not limited by the following examples. Example;
The bacterial culture JP-3 was grown in sterilized complex organic medium containing 0.5% yeast extract, 1% wool fibres in tap water, in 250 ml. Conical flask at 37°C for 2 days on rotary shaker at 220 rpm. The content was filtered aseptically to separate the undigested wool fibres and 0.5% sterile Kevlar 29, or 49 or 149 or Technora T-240 aramid fibres were added and further incubated at 37°C on rotary shaker for 3 to 5 days. Partially degraded aramid fibres were collected at 12 hours intervals. The biodegraded fibres have more reactive surface and microfibreils protuding from the surface. Two distinct fiber structure i.e. fibrillated and nonfibrillated were clearly differentiated after the process.

I CLAIM
1. A process of sequential bio degradation for preferential degradation of
amorphous zones of aramid fibers characterised in that is the step of growing bacterial isolate JP- 3 in liquid medium containing natural polyamide fibres such as wool fibres, yeast extract at 37°C for 3 day adding sterilized aramid fibres in the bacterial culture, incubation at 37°C for 3 to 5 days, removing the degraded fibres at 12 hours intervals, mild rinsing with distilled water, drying at 120°C for 24 hours and treating the aramid fibres with clarified cultured medium, isolate containing active reactants as herein described.
2. A process as claimed in claim 1 wherein the step of growth is carried
out by stirring slowly preparably on rotory shaker.
3. A process of sequential bio degradation for preferential degradation of
amorphous zones of aramid fibers substantially as herein described
and illustrated in the examples.

Documents:

474-del-1996-abstract.pdf

474-del-1996-claims.pdf

474-del-1996-correspondence-others.pdf

474-del-1996-correspondence-po.pdf

474-del-1996-description (complete).pdf

474-del-1996-form-1.pdf

474-DEL-1996-Form-15-(19-08-2010).pdf

474-del-1996-form-19.pdf

474-del-1996-form-2.pdf

474-del-1996-form-3.pdf

474-del-1996-gpa.pdf

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Patent Number

214755

Indian Patent Application Number

474/DEL/1996

PG Journal Number

09/2008

Publication Date

29-Feb-2008

Grant Date

15-Feb-2008

Date of Filing

08-Mar-1996

Name of Patentee

THE CHIEF CONTROLLER RESEARCH & DEVELOPEMENT

Applicant Address

MINISTRY OF DEFENCE, GOVT OF INDIA, B-341, SENA BHAWAN, DHQ P.O., NEW DELHI 110 001

Inventors:

#	Inventor's Name	Inventor's Address
1	DR. JITENDRAPRASAD PRABHUSHANKER TRIVEDI	DEFENCE MATERIALS & STORES RESEARCH & DEVELOPEMENT ESTABLISHMENT, KANPUR (U.P.)
2	PRABHUSHANKER TRIVEDI	DEFENCE MATERIALS & STORES RESEARCH & DEVELOPEMENT ESTABLISHMENT, KANPUR (U.P.)
3	SHRI RAJESH CHATTARJEE	DEFENCE MATERIALS & STORES RESEARCH & DEVELOPEMENT ESTABLISHMENT, KANPUR (U.P.)

PCT International Classification Number

C12N 001/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA