Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1999-02-23
2001-09-11
Teskin, Fred (Department: 1713)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S082000, C264S036100, C264S036150, C264S036220, C264S080000, C427S140000, C427S195000, C427S375000, C524S272000, C524S274000, C524S275000, C524S462000, C524S464000, C524S475000, C524S476000, C524S487000, C524S490000, C524S583000, C524S585000
Reexamination Certificate
active
06287405
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to repairing molded polyolefin objects and, more particularly, to a method and composition for cosmetically repairing a surface blemish in such an object.
2. Description of the Related Art
Polyolefin plastics are a broad category of materials including, but not limited to, polyethylene, polypropylene, and ethyl-vinyl acetate. Numerous everyday objects are made from polyolefin plastics (sometimes hereafter “objects” or “polyolefin objects.”) Such objects are commonly formed from various molding operations such as injection molding, blow molding, rotational molding, and so on.
The manufactures of polyolefin objects generally strive to achieve highly efficient, cost-effective manufacturing processes to effectively compete in their given markets. The foregoing molding processes invariably damage a certain percentage of the objects, however, due to bad parting lines, trapped air pockets, tight mold radii, difficult to mold resins, and the like. The damage is often only cosmetic and not structural. The “damaged” object, therefore, could easily perform its intended task. Because it is not marketable in its damaged condition, however, the damaged object is usually discarded or ground up and re-molded into subsequent objects, thereby increasing the overall manufacturing cost and lowering the quality of the subsequent objects.
There remains a need, therefore, for a method and composition for salvaging polyolefin objects which are nominally defective due only to cosmetic blemishes.
OBJECTIVES OF THE INVENTION
It is an objective of this invention to provide a method for cosmetically repairing a blemish in a polyolefin object.
It is a further objective of the invention to provide a method for permanently repairing a blemish in a polyolefin object.
It is a further objective of the invention to provide a method for cosmetically repairing a blemish in a polyolefin object wherein the repair matches the color of the original object.
other and related objectives will be apparent from the following description of the invention.
SUMMARY OF INVENTION
In a first aspect, the invention may be regarded as a method of repairing a surface blemish consisting of a void in a surface of a polyolefin object comprising the steps of: (a) inserting a repair composition into said void wherein said repair composition consists essentially of: (i) 30 to 60 weight percent of a thermoplastic component consisting of particulate polyolefin powder selected from the group consisting of polyethylene, polypropylene, and ethylene-vinyl acetate (EVA); (ii) 15 to 45 weight percent of a resin component selected from the group consisting of aliphatic and aromatic hydrocarbon, polyterpene, rosin and rosin-ester, chlorinated polyolefin resins, petroleum, and synthetic and oxidized waxes; and (iii) 5 to 35 weight percent of a solvent component; and (b) heating the repair composition in said void and a surrounding portion of said polyolefin object by exposing the repair composition and the surrounding portion of said polyolefin object to atmospheric heating at a temperature sufficient to fuse said repair composition to said polyolefin object.
In a second aspect, the invention may be regarded as a repair composition for repairing a surface blemish consisting of a void in a surface of a polyolefin object, said repair composition consisting essentially of: (a) 30 to 60 weight percent of a thermoplastic component consisting of particulate polyolefin powder selected from the group consisting of polyethylene, polypropylene, and ethylene-vinyl acetate (EVA); (b) 15 to 45 weight percent of a resin component selected from the group consisting of aliphatic and aromatic hydrocarbon, polyterpene, rosin and rosin-ester, chlorinated polyolefin resins, petroleum, and synthetic and oxidized waxes; and (c) 5 to 35 weight percent of a solvent component
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Reeves Robert A.
Stevenson Matthew
Stevenson Michael J.
Andras Joseph C.
Myers Dawes & Andras
Teskin Fred
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