Treatment of cellulose fabrics with cellulases

• US 6,083,739 A
• Filed: 09/24/1998
• Issued: 07/04/2000
• Est. Priority Date: 09/29/1997
• Status: Expired due to Fees

• Current Assignee: Novozymes North America Incorporated (Novozymes)
• Original Assignee: NOVO Nordisk Biochem North America Incorporated
• Inventors: Franks, Neal Edward
• Primary Examiner(s): Redding, David A.
• Application Number:
  US09/159,860
• Time in Patent Office: 649 Days
• Field of Search: 435/263, 435/277, 19/40, 8/112, 8/116, 8/401
• US Class Current: 435/263
• CPC Class Codes: C11D 3/38645 containing cellulase
• CPC Class Codes: C11D 3/3947 Liquid compositions
• CPC Class Codes: C11D 3/3956 Liquid compositions
• CPC Class Codes: D06L 1/14 De-sizing
• CPC Class Codes: D06L 4/00 Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
• CPC Class Codes: D06L 4/12 combined with specific additives
• CPC Class Codes: D06L 4/23 using hypohalogenites
• CPC Class Codes: D06L 4/24 using chlorites or chlorine dioxide
• CPC Class Codes: D06M 16/003 with enzymes or microorganisms

Abstract

This invention relates to a cellulase treatment of cellulosic fabric to achieve biopolishing effects, reducing dust or lint and reducing pilling during at least one laundry cycle in said fabric comprising treating said fabric with cellulase after the scouring step and before the bleaching step.

Claims

1. A batch process for treating a cellulosic fabric, said process comprising:

(i) scouring said fabric under alkaline conditions, (ii) treating said fabric with cellulase, (iii) bleaching said fabric, and (iv) drying said fabric, wherein said fabric is treated with cellulase in a batch process after scouring and before bleaching.

2. The process according to claim 1, in which said cellulosic fabric is a cotton fabric.

3. The process according to claim 1, in which said fabric is scoured by treating said fabric with one or more scouring agents selected from the group consisting of sodium hydroxide, soda ash, phosphates, and surfactants.

5. The process according to claim 1 in which said fabric is treated with at least one scouring agent at a temperature between about 80 and about 100°

C.

6. The process according to claim 1, in which said cellulase is a multicomponent cellulase.

7. The process according to claim 1, in which said cellulase is derived from Trichoderma.

8. The process according to claim 1, in which said cellulase is a monocomponent cellulase.

9. The process according to claim 8, in which said monocomponent cellulase is derived from Humicola.

10. The process according to claim 1, in which said cellulase is a mixture of a multicomponent and monocomponent cellulase.

11. The process according to claim 5, in which said fabric is treated with cellulase at a temperature between about 10 and about 65°

C.

12. The process according to claim 1, in which said fabric is treated with cellulase at a pH between about 4 and about 6.5.

13. The process according to claim 1, in which said fabric is treated with cellulase at a level between about 200 and about 2,000 EGU/kg fabric.

14. The process according to claim 1, in which said fabric is treated with between about 1,000 and about 10,000 ECU/kg fabric.

15. The process according to claim 1, in which said fabric is bleached with at least one bleaching agent selected from the group consisting of hydrogen peroxide, sodium hypochlorite and sodium chlorite.

16. The process according to claim 1, in which said fabric during the bleaching step is treated with a bleaching liquor comprising a bleaching agent and a surfactant.

17. The process according to claim 1, in which said fabric during the bleaching step is treated with a bleaching liquor comprising a bleaching agent and a lubricant.

18. The process according to claim 1, in which said fabric during the bleaching step is treated with a bleaching liquor comprising a bleaching agent and a stabilizer.

19. The process according to claim 1, in which said fabric during the bleaching step is treated with a bleaching liquor comprising a bleaching agent, a lubricant, a surfactant, and a stabilizer.

20. The process according to claim 1 in which said fabric is treated with at least one bleaching agent at a temperature between about 45 and about 80°

C.

21. The process according to claim 1, further comprising a dyeing step after step (iii) and before step (iv).

4. The process according to claim I in which said fabric is treated with at least one scouring agent for about 30 min. to 90 min.

22. A batch process for reducing pilling of a fabric during at least one laundry cycle, said method comprising the sequential steps of:

(a) scouring the fabric under alkaline conditions;

(b) treating the scoured fabric of step (a) with cellulase;

(c) bleaching the treated fabric of step (b); and

(d) drying the bleached fabric of step (c).