US4789597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incorporation of chemically reactive agents on resin particles
Assignee: Fetherstonhaugh and Co
•
Filing: 1987-01-12
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Granted: 1988-12-06
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Expires: 2007-01-12
Abstract
Abstract Chemically reactive agents may be locked to particles of suitable synthetic resins without wholly fluxing the resins. Thus a high quality intermediate product is obtained having no premature reaction taking place, suitable for further techniques. The process comprises the steps of intensively mixing and thermokinetically heating a batch of finely divided resin particles, with a chemically reactive agent, in an enclosed mixing chamber with a plurality of blades attached to arms rotating about a central axis within the chamber, and having a blade tip speed of at least about 18 meters per second, mixing the batch until the chemically reactive agent is locked to the resin particles, ensuring that temperature of the batch stays well below decomposition temperature of the reactive agent and below fluxing temperature of the resin particles, discharging the batch from the mixing chamber and cooling the discharged batch to avoid agglomeration of the resin particles.
Inventors
- 👤 Ved Gupta
- 👤 Jerome E. Hager
- 👤 Ralph A. Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:03
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/002; B29B7/005; B01; B01F; B01F35/00; B01F35/20; B01F35/22; B01F35/221; B01F35/2214; B01F35/22142; B01F35/221421; B01F35/2215; B29B7/02; B29B7/06; B29B7/10; B29B7/12; B29B7/16; B29B7/80; B29B7/82; B29B7/88; C; C08; C08J; C08J3/00; C08J3/20; C08J3/203; B29K; B29K2055/00; B29K2055/02; B29K2105/00; B29K2105/0005; B29K2105/0014; B29K2105/25; B29K2105/251; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
191 words
A process for incorporating chemically reactive agents on suitable synthetic resins comprising the steps of: introducing a batch of finely divided resin particles and chemically reactive agent into an enclosed mixing chamber having a plurality of blades attached to arms rotatable about a central axis within the chamber, the blades having enlarged surfaces relative to the arms to provide paddles for mixing of the resin particles and the reactive agent, rotating the blades in the mixing chamber at a blade tip speed of at least 18 meters per second to intensively mix and thermokinetically heat the batch of resin particles and chemically reactive agent, continuously monitoring the batch of resin particles and chemically reactive agent so as to maintain the temperature of the batch well below decomposition temperature of the reactive agent and below fluxing temperature of the resin particles, continuing the mixing cycle until the chemically reactive agent is locked to the resin particles, discharging the batch from the mixing chamber and cooling the discharged batch to avoid agglomeration of the resin particles to provide a product of unagglomerated particles of resin having reactive agent locked to the surface thereof.
Claim 2
Dependent Claim
191 words
A process for incorporating chemically reactive agents on suitable synthetic resins comprising the steps of: introducing a batch of finely divided resin particles and chemically reactive agent into an enclosed mixing chamber having a plurality of blades attached to arms rotatable about a central axis within the chamber, the blades having enlarged surfaces relative to the arms to provide paddles for mixing of the resin particles and the reactive agent, rotating the blades in the mixing chamber at a blade tip speed of at least 18 meters per second to intensively mix and thermokinetically heat the batch of resin particles and chemically reactive agent, continuously monitoring the batch of resin particles and chemically reactive agent so as to maintain the temperature of the batch well below decomposition temperature of the reactive agent and below fluxing temperature of the resin particles, continuing the mixing cycle until the chemically reactive agent is locked to the resin particles, discharging the batch from the mixing chamber and cooling the discharged batch to avoid agglomeration of the resin particles to provide a product of unagglomerated particles of resin having reactive agent locked to the surface thereof.
Claim 3
Dependent Claim
16 words
The process according to claim 1 wherein the discharged batch is cooled in a ribbon blender.
Claim 4
Dependent Claim
19 words
The process according to claim 1 wherein the mixing temperature softens the surface of the finely divided resin particles.
Claim 5
Dependent Claim
50 words
The process according to claim 1 wherein the synthetic resins are selected from the group consisting of linear and branched low density polyethylene, medium density polyethylene, high density polyethylene, polyethylene copolymers, polypropylene, polypropylene copolymers, polyvinyl chloride, polyvinyl chloride copolymers, polystyrene, acrylics, acrylonitrile butadiene-styrene copolymers, polyvinylidene chloride and polyvinylidene chloride copolymers.
Claim 6
Dependent Claim
16 words
The process according to claim 1 wherein the chemically reactive agent is a cross linking agent.
Claim 7
Dependent Claim
16 words
The process according to claim 1 wherein the chemically reactive agent is a chemical foaming agent.
Claim 8
Dependent Claim
14 words
The process according to claim 1 wherein a combination of reactive agents is used.
Claim 9
Dependent Claim
26 words
The process according to claim 1 wherein a single or combination of reactive agents is used with other additives such as lubricants, processing acids and stabilizers.
Claim 10
Dependent Claim
26 words
Finely divided synthetic resin particles having a chemically reactive agent locked to the surface of the resin particles, produced according to the process of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |