US4704330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformly coated polymeric composition
Assignee: Dow Chemical Co
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Filing: 1986-11-12
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Granted: 1987-11-03
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Expires: 2006-11-12
Abstract
Abstract A particulated thermoplastic polymer having a uniform surface coating of zinc stearate is prepared by contacting the polymer particles with atomized droplets of molten zinc stearate while supporting and conveying the polymer by a moving stream of a gas. Reduced frictional forces allow increased volumes of coated particles to be transported by pneumatic conveyance. Substantially reduced fine particulate generation or "dusting" is observed for the composition.
Inventors
- 👤 Eugene R. Moore
- 👤 Jon T. Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A composition of matter comprising a particulated solid thermoplastic polymer having applied to the surface thereof a substantially uniform coating consisting of zinc stearate, said coating having been applied by contacting the particulated polymer with atomized droplets of the molten coating while supporting and conveying the particles by a moving stream of a gas.
Claim 2
Dependent Claim
54 words
A composition of matter comprising a particulated solid thermoplastic polymer having applied to the surface thereof a substantially uniform coating consisting of zinc stearate, said coating having been applied by contacting the particulated polymer with atomized droplets of the molten coating while supporting and conveying the particles by a moving stream of a gas.
Claim 3
Dependent Claim
12 words
A composition according to claim 1, wherein the thermoplastic polymer comprises polystyrene.
Claim 4
Dependent Claim
27 words
A composition according to claim 1, wherein the coating is applied in an amount of from about 100 to about 2,000 ppm based on thermoplastic polymer weight.
Claim 5
Dependent Claim
26 words
A composition according to claim 3, wherein the coating is applied in an amount from about 800 to about 1,500 ppm based on thermoplastic polymer weight.
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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |