Patent US4281036A successfully refreshed from Google Patents.
US4281036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating fine particulate expandable styrene polymers
Assignee: Huels AG
•
Filing: 1980-07-24
•
Granted: 1981-07-28
•
Expires: 2000-07-24
Abstract
Abstract Fine particulate expandable styrene polymers have coatings applied thereto by: (a) introducing the fine particulate expandable styrene polymers into a closed mixing vessel; (b) reducing the pressure in the mixing vessel below atmospheric; (c) preparing dispersions of the coating materials and heating the dispersions to about 30° to 90° C.; and (d) aspirating the heated dispersions of the coating materials into the mixing vessel while simultaneously mixing the dispersions with the particulate styrene polymers to form a coating thereon and drying the coated particles.
Inventors
- 👤 Horst Leithauser
- 👤 Heinz Osterhoff
- 👤 Karl Trukenbrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:36
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
In a method for coating fine particulate expandable styrene polymers with dispersion of coating materials, the improvement comprising: (a) introducing the fine particulate expandable styrene polymers into a closed mixing vessel; (b) reducing the pressure in the mixing vessel below atmospheric; (c) preparing dispersions of the coating materials and heating the dispersions to about 30° C.; and (d) aspirating the heated dispersions of the coating materials into the mixing vessel while simultaneously mixing the dispersions with the particulate styrene polymers to form a coating thereon and drying the coated particles.
Claim 2
Dependent Claim
90 words
In a method for coating fine particulate expandable styrene polymers with dispersion of coating materials, the improvement comprising: (a) introducing the fine particulate expandable styrene polymers into a closed mixing vessel; (b) reducing the pressure in the mixing vessel below atmospheric; (c) preparing dispersions of the coating materials and heating the dispersions to about 30° C.; and (d) aspirating the heated dispersions of the coating materials into the mixing vessel while simultaneously mixing the dispersions with the particulate styrene polymers to form a coating thereon and drying the coated particles.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein ungraded, water-moist, fine-particulate expandable styrene polymers are used and the coated particles are then graded by size.
Claim 4
Dependent Claim
24 words
The method of claim 2, wherein rejected grain sizes are recirculated into the suspension polymerization for the purpose of preparing additional expandable styrene polymers.
Claim 5
Dependent Claim
15 words
The use of the coated particles of claim 1 in the manufacture of molded articles.
Claim 6
Dependent Claim
17 words
The method of claim 1, wherein the pressure of step (b) is about 1 to 100 millibars.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein the pressure of step (b) is about 5 to 15 millibars.
Claim 8
Dependent Claim
22 words
The method of claim 5, wherein said dispersions of step (c) have a solid content of about 5 to 35% by weight.
Claim 9
Dependent Claim
21 words
The method of claim 7, wherein said coating amounts to about 0.05 to 6% by weight of said particulate styrene polymers.
Claim 10
Dependent Claim
22 words
The method of claim 1, wherein said particulate styrene polymers have a particle size between about 0.3 to 3.0 mm in diameter.
Claim 11
Dependent Claim
18 words
The method of claim 1, wherein said particle size is between about 0.3 to 0.9 mm in diameter.
Claim 12
Dependent Claim
18 words
The method of claim 9, wherein said particle size is between about 0.9 to 3.0 mm in diameter.
Claim 13
Dependent Claim
22 words
The method of claim 1, wherein said coating materials are selected from the group consisting of glycerin stearates, metallic soaps and bis-stearylethylenediamine.
Claim 14
Dependent Claim
26 words
The method of claim 2, wherein watermoist, expandable styrene polymers have a water content of about 1.0 to 1.5% by weight based on said styrene polymers.
References Cited (Backward Citations)
GB817981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |