Biodegradable plastic product made from coconut husk fiber powder mixture

• US 6,083,621 A
• Filed: 02/17/1998
• Issued: 07/04/2000
• Est. Priority Date: 01/23/1996
• Status: Expired due to Fees

• Current Assignee: Ichiro Sugimoto
• Original Assignee: Ichiro Sugimoto
• Inventors: Sugimoto, Ichiro
• Primary Examiner(s): Krynski, William
• Assistant Examiner(s): CRONIN, CHRITOPHER J
• Application Number:
  US09/024,678
• Time in Patent Office: 868 Days
• Field of Search: 428/373, 428/374, 428/375, 428/378, 524/433, 524/45, 524/702, 524/13, 524/35, 524/47, 525/337, 523/128, 523/124
• US Class Current: 428/378
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: Y10T 428/2933 Coated or with bond, impregnation or core
• CPC Class Codes: Y10T 428/2938 Coating on discrete and individual rods, strands or filaments

Abstract

Processed plant fine fibers such as those from the mesocarp of a coconut together are blended with a biodegradable plastic to produce a biodegradable plastic product that can be further made into other items. Plastics thus made from coconut husk fine fiber powder will return to the environment after disposal much more rapidly than those without coconut husk fine fiber powder. In the process, a dry compressed plant fine fiber powder is created from fine fibers of the coconut mesocarp. An example product created from this raw material is composed of 10 to 40% by weight of dry coconut husk powder mixed with environmentally degradable plastic. Environmentally non-degradable plastic may be added to the dry powder as a biodegradation rate modulator to create a modified raw material with a modified biodegradation rate. Plastic additives, standard in the industry, can be added to achieve additional desired properties. For example, a surface active agent may be added in order to increase the degree of processability; a colorant may be added to increase marketability; pesticides may be added as needed in order to protect the product or the soil in which the product is disposed from insects; and/or polymerization modifiers such as cross-linkers, monomer derivatives, heteromonomers, curing agents, etc. may be utilized to vary the properties of the base plastic.

Claims

1. A biodegradable plastic product, consisting essentially of:

from about 95 to about 60% by weight of a biodegradable plastic; and

from about 5 to about 40% by weight of a dried powder, said dried powder being produced from the fine fibers of a coconut mesocarp.

2. A biodegradable plastic product according to claim 1, wherein said biodegradable plastic product further includes about 1 to about 2% each by weight of at least one member selected from the group consisting of a surface active agent and a pesticide.

3. A biodegradable plastic product according to claim 1, wherein said biodegradable plastic product further includes about 5 to about 10% by weight of a colorant.

4. A biodegradable plastic product according to claim 1, wherein said biodegradable plastic is an aliphatic polyester.

5. A biodegradable plastic product according to claim 1, further includes about 5 to about 40% by weight of an environmentally non-degradable plastic.

6. A method of making a biodegradable plastic product, comprising the steps of:

making a mixture, said mixture consisting essentially of

A) from about 95 to about 60% by weight of a biodegradable plastic, and

B) from about 5 to about 40% by weight of a dried powder, wherein said dried powder is produced from the fine fibers of a coconut mesocarp.

7. A method of making a biodegradable plastic product according to claim 6, further comprising the steps of:

separating a fine fiber component from a coconut;

removing substantially completely a contaminant component from said fine fiber component, said contaminant component comprising at least one of a salt and a tannin, to produce a cleaned fine fiber mass;

drying said cleaned fine fiber mass to a water content of less than about 10 wt % to produce a dried fine fiber mass;

compressing said dried fine fiber mass to produce a compressed fine fiber mass;

processing said compressed fine fiber mass to produce a powder having particle lengths of from about 10 to about 80 microns; and

drying said powder to a water content of less than about 3 wt % to produce said dried powder.

8. A method of making a biodegradable plastic product according to claim 6, wherein said biodegradable plastic is an aliphatic polyester.

9. A method of making a biodegradable plastic product according to claim 6, wherein said mixture further includes about 1 to about 2% by weight of at least one member selected from the group consisting of a surface active agent and a pesticide.

10. A method of making a biodegradable plastic product according to claim 6, wherein said mixture further includes about 5 to about 10% by weight of a colorant.

11. A method to make a biodegradable plastic product according to claim 6, wherein said mixture further contains from about 5 to about 40% by weight of a non-biodegradable plastic.