US3892834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface active agent to reduce agglomeration in dry die-face pelletizing
Assignee: Phillips Petroleum Co
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Filing: 1974-01-09
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Granted: 1975-07-01
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Expires: 1994-01-09
Abstract
Abstract In a dry die-face pelletizing operation, wherein strands of polymer are extruded and cut into pellets at the die face using a rotary cutting means, the pellets are thrown out against an inner wall of a generally cylindrical housing where they contact a stream of water containing a surface active agent.
Inventors
- 👤 James E Pritchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; B29C; B29C2793/00; B29C2793/009
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
IN A PROCESS FOR PRODUCING PELLETS FROM NORMALLY SOLID POLYMER OF AT LEAST ONE MONO-1-OLEFIN HAVING 2 TO 8 CARBON ATOMS PER MOLECULE, WHEREIN SAID POLYMER IS HEATED TO A MOLTEN CONDITION, EXTRUDED THROUGH A PLURALITY OF ORIFICES IN A DIE HAVING A DRY DIE-FACE, SERVED ADJACENT SAID DIE-FACE TO PRODUCE SAID PELLETS, SAID PELLETS THEREAFTER BEING THROWN OUT TOWARD AN INNER SURFACE OF A HOUSING WHERE THEY CONTACT A STREAM OF WATER MOVING AROUND SAID INNER SURFACE AND AXIALLY AWAY FROM SAID DIE FACE, THE IMPROVEMENT COMPRISING INCORPORATING 0.0025 TO 0.35 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID WATER OF A SURFACE ACTIVE AGENT INTO SAID WATER TO REDUCE AGGLOMERATION OF SAID PELLETS.
Claim 2
Dependent Claim
115 words
IN A PROCESS FOR PRODUCING PELLETS FROM NORMALLY SOLID POLYMER OF AT LEAST ONE MONO-1-OLEFIN HAVING 2 TO 8 CARBON ATOMS PER MOLECULE, WHEREIN SAID POLYMER IS HEATED TO A MOLTEN CONDITION, EXTRUDED THROUGH A PLURALITY OF ORIFICES IN A DIE HAVING A DRY DIE-FACE, SERVED ADJACENT SAID DIE-FACE TO PRODUCE SAID PELLETS, SAID PELLETS THEREAFTER BEING THROWN OUT TOWARD AN INNER SURFACE OF A HOUSING WHERE THEY CONTACT A STREAM OF WATER MOVING AROUND SAID INNER SURFACE AND AXIALLY AWAY FROM SAID DIE FACE, THE IMPROVEMENT COMPRISING INCORPORATING 0.0025 TO 0.35 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID WATER OF A SURFACE ACTIVE AGENT INTO SAID WATER TO REDUCE AGGLOMERATION OF SAID PELLETS.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said surface active agent is incorporated in an amount within the range of 0.01 to 0.03 weight percent based on the weight of said water.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein said surface active agent is an anionic surface active agent which is a strong wetting agent.
Claim 5
Dependent Claim
11 words
A method according to claim 1 wherein said polymer is polypropylene.
Claim 6
Dependent Claim
36 words
A method according to claim 1 wherein said pellets are severed and thrown out against said inner surface by means of a multibladed knife rotating at a speed within the range of 700 to 3,500 rpm.
Claim 7
Dependent Claim
38 words
A method according to claim 1 wherein said water enters said housing tangentially from a plurality of points at an upstream end of said housing and exits taNgentially with said pellets at a downstream end of said housing.
Claim 8
Dependent Claim
24 words
A method according to claim 1 wherein said polymer is extruded through a plurality of orifices arranged in a circle concentric with said die-face.
Claim 9
Dependent Claim
16 words
A method according to claim 1 wherein said surface active agent is sodium isopropyl naphthalene sulfonate.
Claim 10
Dependent Claim
111 words
A method according to claim 8 wherein said surface active agent is present in an amount within the range of 0.014 to 0.025 weight percent based on the weight of said water, said polymer is severed by means of a multi-bladed knife rotating at a speed within the range of 700 to 3,500 rpm, said water enters tangentially at a forward end of said housing and exits tangentially from a downstream end of said housing carrying with it said pellets, said polymer is extruded through a plurality of orifices arranged in a circle concentric with said die-face, said surface active agent is sodium isopropyl naphthalene sulfonate, and said polymer is polypropylene.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |