Patent US4269798A successfully refreshed from Google Patents.
US4269798A
Expired / Lapsed
US
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Method for producing a curable, filled resin composition, e.g., artificial marble
Assignee: PMC Inc
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Filing: 1978-10-23
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Granted: 1981-05-26
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Expires: 1998-10-23
Abstract
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.
Inventors
- 👤 Frank E. Ives
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:49
CPC Classifications
B; B28; B28C; B28C9/00; B28C9/002; B29; B29B; B29B7/00; B29B7/002; B29B7/007; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/44; B29B7/58; B29B7/60; B29B7/74; B29B7/7461; B29B7/7476; B29B7/748; B29B7/7485; B29B7/80; B29B7/88; B29B7/90; B29B7/94
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
200 words
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° 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.
Claim 2
Independent Claim
200 words
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° 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.
Claim 3
Dependent Claim
16 words
The method of claim 1 further comprising: adding pigment to said composition in said mixing zone.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein said pigment is mixed with a curable resin before being added to said composition.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said resin is heated to a predetermined temperature above room temperature and below about 140° F. immediately prior to being fed to said conveying zone.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein said polyester resin is heated to a temperature in the range of from about 90° F. to about 120° F. immediately prior to introducing said resin into said conveying zone.
Claim 7
Independent Claim
31 words
The method of claims 4 or 5 wherein the temperature of said resin being fed into said conveying zone is maintained within less than about 2° F. of said predetermined temperature.
Claim 8
Independent Claim
28 words
The method of claims 4 or 5 wherein said resin being fed into said conveying zone is maintained within less than about 5° F. of said predetermined temperature.
Claim 9
Dependent Claim
58 words
The method of claim 1 wherein said mixture is employed to produce artificial marble, wherein said filler material comprises a finely divided mineral aggregate, and wherein said resin is combined with said aggregate in an amount ranging from about 18 weight percent to about 25 weight percent, the weight percentages being based on the combined resin and aggregate.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein said aggregate comprises calcium carbonate and wherein said resin comprises a polyester resin containing a cross-linking monomer.
Claim 11
Dependent Claim
56 words
The method of claim 1 wherein said mixture is used to produce synthetic onyx, wherein said filler material comprises aluminum trihydrate and glass frit, and wherein said resin is combined with said filler material in an amount ranging up to about 35 weight percent, the percentage being based on the mixture of resin and filler material.
Claim 12
Dependent Claim
46 words
The method of claim 1 wherein said resin and said filler material pass though said mixing zone together and have a concurrent residence time from the time they enter said conveying zone to the time they leave said mixing zone of less than about 1 minute.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |