Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-10-25
2004-04-13
Sanders, Kriellion A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S299000
Reexamination Certificate
active
06720365
ABSTRACT:
CROSS REFERENCES TO RELATED APPLICATIONS
The present document is based on Japanese Priority Documents JP 2000-329105, 2000-329106 and 2000-329107, all filed in the Japanese Patent Office on Oct. 27, 2000, the entire contents of which being incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to, for example, a flame retardant for resin for imparting flame retardancy to a resin, a flame-retarded resin containing the flame retardant for resin, and a method for imparting flame retardancy to a resin. In addition, the present invention relates to, for example, an antistatic agent for resin for imparting antistatic properties to a resin, an antistatic resin containing the antistatic agent for resin, and a method for imparting antistatic properties to a resin. Further, the present invention relates to, for example, a biodegradable resin composition having biodegradability, and a biodegradable-resin shaped article obtained by shaping the biodegradable resin composition, and a method for producing the same.
2. Description of the Related Art
There is a tendency that sludge and waste plastics discharged increase with years. However, the sludge and waste plastics are mainly disposed of by landfilling and incinerating, and thus now most of them are not utilized effectively.
On the other hand, in products in various fields, such as household electric appliances, a large amount of plastics are used from the viewpoint of achieving the reduction in weight and price of the products and improving the processability during the production therefor. For improving the safety of products made of plastics, it is essential to impart flame retardancy to plastics, and further, for securing and improving the safety and reliability of the products, it is essential to impart antistatic properties to plastics.
Further, plastics are widely used in various products, such as containers, packaging materials, household utensils, agricultural tools and materials, building materials for houses, and parts for automobiles and household electric appliances.
A plastic has such excellent properties that the weight is small, the strength is high, and the processability is good; however, it has problems that waste ones after use are bulky and therefore cause a lack of ground for their disposal, and that they are almost not decomposed after being buried.
As environmental problems are recently being emphasized, for solving the above problems, a biodegradable resin is attracting attention as a material reducing the environmental burden (i.e., material which can return to earth).
SUMMARY OF THE INVENTION
As mentioned above, the sludge and waste plastics are generally disposed of by landfilling and incinerating. However, a technique which substitutes for these disposal methods is desired for the reasons that ground for landfilling the sludge and waste plastics is lacking and that dioxins or the like are generated upon incinerating them.
In addition, in recent years, environmental problems including the above-mentioned problems of waste are being emphasized, and hence techniques of effectively utilizing waste products are needed worldwide.
On the other hand, for imparting flame retardancy to a plastic material, a flame retardant is generally added to a plastic. However, as the flame retardant to be added, a relatively expensive material is needed, and therefore a technique which can effectively impart flame retardancy to a plastic material at lower cost is desired.
In view of the above-mentioned social conditions and problems accompanying the conventional techniques, the present invention achieves the effective utilization of sludge and waste plastics and provides a flame retardant for resin having excellent effect of imparting flame retardancy to a resin (hereinafter, frequently referred to as “flame-retardancy imparting effect”), a flame-retarded resin containing the above flame retardant for resin, and a method for imparting flame retardancy to a resin (hereinafter, frequently referred to as “flame-retardancy imparting method”).
On the other hand, for imparting antistatic properties to a plastic material, an antistatic agent is generally added to a plastic. However, as the antistatic agent to be added, a relatively expensive material is needed, and therefore a technique which can effectively impart antistatic properties to a plastic material at lower cost is desired.
Further, the above-mentioned conventional biodegradable resin is expensive and poor in performance, especially in mechanical properties, such as an impact resistance, flame retardancy, and antistatic properties, as compared to general synthetic non-biodegradable plastics. Such disadvantages are fatal problems that prevent the demands of biodegradable resins from increasing.
On the other hand, sludge constitutes the largest amount of general waste and industrial waste, and the sludge discharged increases with the years. Part of the sludge discharged is utilized as compost, but most of the sludge is disposed of by landfilling and incinerating, and thus now is not utilized effectively. In recent years, environmental problems including the above-mentioned problems of waste are being emphasized, and hence techniques of effectively utilizing the sludge discharged are needed worldwide.
In view of the above-mentioned social conditions and problems accompanying the conventional techniques, the present invention also achieves the effective utilization of sludge and also provides a biodegradable resin composition and a biodegradable-resin shaped article each having more excellent performance than that of a conventional biodegradable resin, and a method for producing the same.
The present inventor has made extensive and intensive studies with a view toward solving the above-mentioned problems. As a result, it has been found that the sludge dried material can be used as a flame retardant for resin having excellent flame-retardancy imparting effect for various resins, and thus the present invention has been completed.
Specifically, the flame retardant for resin of the present invention comprises a sludge component.
The flame-retarded resin of the present invention comprises a resin component and a flame retardant for resin, wherein the flame retardant comprises a sludge component.
The term “sludge component” used in the present invention means a component of sludge.
For example, as the sludge component, the flame retardant comprises an inorganic sludge component, preferably comprises, as the sludge component, at least one element selected from the group consisting of aluminum, calcium, iron, silicon, magnesium, titanium, antimony, chlorine, and fluorine.
In the present specification, sludge which comprises a sludge component comprised mainly of an inorganic substance is referred to as “inorganic sludge”, and the term “inorganic sludge component” means a component of the inorganic sludge.
For example, as the sludge component, the flame retardant comprises an organic sludge component, preferably comprises, as the sludge component, at least one element selected from the group consisting of phosphorus and nitrogen.
In the present specification, sludge which comprises a sludge component comprised mainly of an organic substance is referred to as “organic sludge”, and the term “organic sludge component” means a component of the organic sludge.
For example, the resin component comprises a resin component derived from a waste plastic.
The flame retardant for resin according to the present invention comprises a sludge component, and the sludge contains various substances, for example, inorganic substances, such as various metals, or organic substances containing phosphorus or nitrogen.
Therefore, for example, a resin to which the flame retardant of the present invention is added can be improved in flame retardancy due to the phosphorus or nitrogen contained in the organic sludge obtained from domestic wastewater.
On the other hand, a resin to which the flame retardant obtained by adding inorganic sludge to a resin compon
Fujihira Yuko
Inagaki Yasuhito
Kananen Ronald P.
Sanders Kriellion A.
Sony Corporation
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