Recyclable cellulosic packaging material

• US 5,362,776 A
• Filed: 07/21/1993
• Issued: 11/08/1994
• Est. Priority Date: 07/21/1993
• Status: Expired due to Fees

• Current Assignee: Packaging Corporation of America
• Original Assignee: Packaging Corporation of America
• Inventors: Bradley, C. Bruce, Conway, Samuel C. Jr., Vargas, Gladys R., Barenberg, Sumner A.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): DeWitt, LaVonda R.
• Application Number:
  US08/095,275
• Time in Patent Office: 475 Days
• Field of Search: 524/34, 524/35, 524/312, 206/584, 206/814, 106/163.1, 106/171, 428/35.6, 428/35.7, 428/393, 523/124
• US Class Current: 524/35
• CPC Class Codes: B65D 65/466 Bio- or photodegradable packaging materials
• CPC Class Codes: C08J 2301/02 Cellulose; Modified cellulose
• CPC Class Codes: C08J 9/06 by a chemical blowing agent
• CPC Class Codes: C08K 5/053 Polyhydroxylic alcohols
• CPC Class Codes: C08L 1/02 Cellulose; Modified cellulose
• CPC Class Codes: C08L 2201/06 Biodegradable
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: Y02W 90/10 Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
• CPC Class Codes: Y10S 206/814 Space filler
• CPC Class Codes: Y10T 428/1348 Cellular material derived from plant or animal source [e.g., wood, cotton, wool, leather, etc.]

Abstract

A packaging material composed of cellulosic fiber, a softener, water, and, optionally, a water soluble binder. The biodegradable packaging material is prepared by a process of admixing cellulosic fiber, a softener, water and, optionally, a water soluble binder to form a slurry, and admixing a blowing agent with the slurry to form a pulp. The pulp is formed into a shaped material and dried.

Claims

1. A biodegradable material comprising cellulosic fiber, softener, and water so as to form a packaging product, provided that the softener is not water.

2. A biodegradable material comprising cellulosic fiber, glycerin, and water so as to form a packaging product.

6. The packaging material of claim 2 including from about 40 to about 85 wt. % cellulosic fiber, from about 10 to about 50 wt. % glycerin, and from about 3 to about 20 wt. % water.

7. The packaging material of claim 2 including from about 45 to about 60 wt. % cellulosic fiber, from about 25 to about 45 wt. % glycerin, and from about 5 to about 15 wt. % water.

3. A biodegradable material comprising cellulosic fiber, glycerin, water, and a water soluble binder so as to form a packaging product.

4. The packaging material of claim 3 wherein the water soluble binder is selected from the group consisting of proteins and water soluble polymers.

5. The packaging material of claim 4 wherein the water soluble polymers are selected from the group consisting of polyvinyl alcohol, gelatin, cornstarch, polyethylene glycol and polyethylene oxide.

8. The packaging material of claim 3 including from about 40 to about 85 wt. % cellulosic fiber, from about 10 to about 50 wt. % glycerin, from about 3 to about 20 wt. % water, and from about 0.5 to about 20 wt. % water soluble binder.

9. The packaging material of claim 3 including from about 45 to about 60 wt. % cellulosic fiber, from about 25 to about 45 wt. % glycerin, from about 5 to about 15 wt. % water, and from about 1 to about 15 wt. % water soluble binder.