CELLULOSIC PRODUCT

• US 20130133848A1
• Filed: 01/25/2013
• Published: 05/30/2013
• Est. Priority Date: 06/17/2008
• Status: Abandoned Application

• Current Assignee: Akzo Nobel N.V. (Nouryon BV)
• Original Assignee: Akzo Nobel N.V. (Nouryon BV)
• Inventors: SOLHAGE, Fredrik, HEIJNESSON-HULTN, Anette Monica, SANDSTRM, John
• Application Number:
  US13/750,503
• Publication Number:
  US 20130133848A1
• Time in Patent Office: Days
• US Class Current: 162/141
• CPC Class Codes: D21H 13/00 Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material chemical features in the manufacture of artificial fibres D01F
• CPC Class Codes: D21H 17/24 Polysaccharides
• CPC Class Codes: D21H 17/25 Cellulose
• CPC Class Codes: D21H 21/54 being spherical, e.g. microcapsules, beads
• CPC Class Codes: D21H 27/10 Packing paper packaging materials of special type or form B65D65/38

Abstract

The present invention relates to a process of producing a cellulosic product comprising (i) providing an aqueous suspension of cellulosic fibers, (ii) adding microfibrillar polysaccharide, (iii) adding thermoplastic microspheres, (iv) dewatering the suspension and forming a cellulosic product. The invention also relates to a process of producing a single layer cellulosic product comprising (i) providing an aqueous suspension of cellulosic fibers, (ii) adding microfibrillar polysaccharide derived from softwood and/or hardwood and optionally adding thermoplastic microspheres to the suspension, (iii) dewatering the suspension and forming a cellulosic product. The invention further relates to a cellulosic product obtainable from said processes. The invention also relates to a composition comprising microfibrillar polysaccharide and thermoplastic microspheres and the use thereof.

Claims

1-26. -26. (canceled)

27. A composition comprising microfibrillar polysaccharide and thermoplastic microspheres, wherein the weight ratio of microfibrillar polysaccharide to thermoplastic microspheres ranges from about 1:

100 to about 200;

1, and wherein the specific surface area, as determined by adsorption of N₂ at 177 K according to the BET method using a Micromeritics ASAP 2010 instrument, of the microfibrillar polysaccharide is from 3 to 10 m²/g.

28. The composition according to claim 27, wherein the composition is aqueous.

29. A cellulosic product obtained by the process comprising the steps of (i) providing an aqueous suspension of cellulosic fibers, (ii) adding microfibrillar polysaccharide, (iii) adding thermoplastic microspheres, (iv) dewatering the suspension and forming a cellulosic product, wherein the weight ratio of microfibrillar polysaccharide to thermoplastic microspheres ranges from about 1:

100 to about 200;

1, and wherein the specific surface area, as determined by adsorption of N₂ at 177 K according to the BET method using a Micromeritics ASAP 2010 instrument, of the microfibrillar polysaccharide is from 3 to 10 m²/g.

30. A cellulosic product comprising microfibrillar polysaccharide and thermoplastic microspheres, wherein the weight ratio of microfibrillar polysaccharide to thermoplastic microspheres ranges from about 1:

100 to about 200;

1, and wherein the specific surface area, as determined by adsorption of N₂ at 177 K according to the BET method using a Micromeritics ASAP 2010 instrument, of the microfibrillar polysaccharide is from 3 to 10 m²/g.

31. The cellulosic product according to claim 30, wherein the product is board or paperboard.

32. The cellulosic product according to claim 30 having a grammage ranging from about 90 to about 500 g/m².

33. The cellulosic product according to claim 30, wherein the microfibrillar polysaccharide is derived from softwood and/or hardwood.

34. The cellulosic product according to claim 30, wherein the cellulosic product contains mechanical, recycled and/or kraft pulp.

35. The cellulosic product according to claim 30, wherein the product contains microfibrillar polysaccharide in an amount from about 0.1 to about 50 wt % based on the weight of cellulosic product.

36. The cellulosic product according to claim 30, wherein the product contains thermoplastic microspheres in an amount from about 0.01 to about 10 wt % based on the weight of cellulosic product.

37. A single layer cellulosic product comprising microfibrillar polysaccharide derived from softwood and/or hardwood, and thermoplastic microspheres, wherein the weight ratio of microfibrillar polysaccharide to thermoplastic microspheres ranges from about 1:

100 to about 200;

1, and wherein the specific surface area, as determined by adsorption of N₂ at 177 K according to the BET method using a Micromeritics ASAP 2010 instrument, of the microfibrillar polysaccharide is from 3 to 10 m²/g.

38. The cellulosic product according to claim 37, wherein the product is board or paperboard.

39. The cellulosic product according to claim 37 having a grammage ranging from about 90 to about 500 g/m².

40. The cellulosic product according to claim 37, wherein the cellulosic product contains mechanical, recycled and/or kraft pulp.

41. The cellulosic product according to claim 37, wherein the product contains microfibrillar polysaccharide in an amount from about 0.1 to about 50 wt % based on the weight of cellulosic product.

42. The cellulosic product according to claim 37, wherein the product contains thermoplastic microspheres in an amount from about 0.01 to about 10 wt % based on the weight of cellulosic product.

43. A method for producing a liquid packaging board, folding box board, or liner by (i) providing an aqueous suspension of cellulosic fibers, (ii) adding microfibrillar polysaccharide, (iii) adding thermoplastic microspheres, (iv) dewatering the suspension and forming a cellulosic product, wherein the weight ratio of microfibrillar polysaccharide to thermoplastic microspheres ranges from about 1:

100 to about 200;

1, and wherein the final specific surface area, as determined by adsorption of N₂ at 177 K according to the BET method using a Micromeritics ASAP 2010 instrument, of the microfibrillar polysaccharide is from 3 to 10 m²/g.