Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2001-01-29
2003-06-03
Heitbrink, Jill L. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C264S328100
Reexamination Certificate
active
06572810
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method of making injection molded articles with improved physical properties and articles produced thereby.
BACKGROUND OF THE INVENTION
Polymer composite enclosure bodies provide light and durable protection for various equipment, particularly, for electronic gadgets. Some polymer composite enclosure bodies protect the highly complex inner workings of devices such as cameras, radios, cassette players, DVD players, CD players, TVs, and other portable devices of the modem age. Unfortunately, a belief has arisen in the consumer community that devices that have polymer or plastic enclosure bodies are inherently less sophisticated, less expensive, and less aesthetically appealing. Some attempts to address the aesthetic appeal have included using and/or applying various colors to polymer composites. Users frequently judge injection molded polymeric articles on the basis of their weight and also their tactile properties. Typically, the polymeric materials do not have enough weight or mass and also do not have good tactile properties, nor are they aesthetically pleasing.
SUMMARY OF THE INVENTION
It is an object of this present invention to provide an injection molded article that is aesthetically pleasing in terms of weight and tactile feel. This object is achieved by providing a method of making an injection molded article, including the steps of: mixing at a temperature of at least 100° C. polymeric materials having a thermal conductivity in the range of 0.001 to 0.01 cal/cm-sec-° C. wherein the polymeric materials are selected from the group consisting of polyethylene, polystyrene, polyester, and polycarbonate or combinations thereof, and one or more materials selected from the group consisting of ceramics, ceramic composites, metals and metal alloys in a blended relationship to form a viscous phase mixture, the materials in the viscous phase mixture being selected so that when in a solid phase it has a density greater than 4 grams/cc and a thermal conductivity greater than 0.101 cal/cm-sec-° C. to form a feedstock; cooling the blended viscous phase mixture to form the feedstock, and using the feedstock in an injection molding machine to form the article.
The advantages of the present invention include:
Developing a family of organic/inorganic composite feedstock which can be successfully utilized in manufacturing injection molded articles with superior mechanical, physical, and tactile properties.
Combining a very cost-effective feedstock which can be readily injection molded to form articles with enhanced mechanical, physical, and tactile properties.
Recognizing that articles made with a feedstock in accordance with the present invention can have high mechanical strength, can have small cross-sectional dimensions and can be made with reduced material cost and processing time.
REFERENCES:
patent: 4839128 (1989-06-01), Yoshino et al.
patent: 5091135 (1992-02-01), Okada et al.
patent: 6165407 (2000-12-01), Tahara et al.
Carlton Donn B.
Chatterjee Dilip K.
Ghosh Syamal K.
Manico Joseph A.
Eastman Kodak Company
Fontaine Monica A
Heitbrink Jill L.
Shaw Stephen H.
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