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US 4,269,798 AGranted
Method for producing a curable, filled resin composition, e.g., artificial marble
OwnerFrank E. Ivesinventor
Life of this patent
Estimating the term…
Abstract
A filler material and a heated, catalyzed synthetic resin are sequentially introduced into a mixer. The mixer has a conveying section and a mixing section. The resin and filler are introduced into the conveying section, which forces the combined resin and filler material into and through the mixing section. The mixing section kneads and shears the material to uniformly disperse the resin throughout the filler. The resin/filler mixture is then dispensed into a mold for curing.
Claims11
A method for producing a curable filled resin composition comprising the steps of:
- feeding a dry, resin free, granular filler material to a first location in a tubular conveying zone,
- separately feeding a curable, thermosetting filler free, polyester resin to a second location in said conveying zone downstream from said first location, said resin being at a temperature above room temperature and below 140.degree. F. when it is fed to the conveying zone,
- conveying said filler material and said resin under confinement through said conveying zone to a confined mixing zone, said mixing zone being tubular and being an axial extension of said tubular conveying zone, said filler material and said resin being subjected to pressure in said conveying zone so as to force the resin and filler material into and through said mixing zone, and mechanically mixing said filler material and said resin by subjecting the filler material and resin to shear forces both in circumferential and axial directions relative to said tubular mixing zone, thereby to form an uncured filled resin composition,
- transferring said composition to a mold immediately after it exits from the confinement of said mixing zone without further mixing, and
- allowing said composition to cure.
2 more elements
Dependencies are inferred from the claim text.