Patent US3883494A successfully refreshed from Google Patents.
US3883494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of emulsifier-containing polyvinyl chloride or vinyl chloride copolymer powders
Assignee: Huels AG
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Filing: 1972-09-14
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Granted: 1975-05-13
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Expires: 1992-09-14
Abstract
Abstract Uniform, finely divided powdery vinyl chloride polymer particles containing less than 2 wt. % particles having a diameter greater than 40 Mu are obtained by spray-drying an aqueous dispersion of the polymer and a carrier gas through a two-fluid atomizer into a water-evaporating atmosphere at specified rates. The resultant polymer particles exhibit inproved handling properties and can be used to form improved plastisols without air separation of the particles.
Inventors
- 👤 Hermann Winter
- 👤 Manfred Smolinski
- 👤 Hans-Georg Wolf
- 👤 Harry Roll
- 👤 Kurt Hoffmann
- 👤 Helmut Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
IN A PROCESS FOR PREPARING POWDERY, EMULSIFIER-CONTAINING VINYL CHLORIDE POLYMER PARTICLES SUITABLE FOR USE N THE MANUFACTURE OF PLASTISOLS BY SPRAY DRYING AN AQUEOUS DISPERSION OF SAID POLYMER WITH A CARRIER GAS THROUGH A TWO-FLUID ATOMIZER INTO A WATER-EVAPORATING ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES SPRAYING WITH 1.6-5.0 KG OF CARRIER GAS PER KG OF SAID DISPERSION TO FORM DRY POWDERY POLYMER PARTICLES CONTAINING LESS THAN 2 WT.% PARTICLES HAVING A DIAMETER GREATER THAN 40 $
Claim 2
Dependent Claim
75 words
IN A PROCESS FOR PREPARING POWDERY, EMULSIFIER-CONTAINING VINYL CHLORIDE POLYMER PARTICLES SUITABLE FOR USE N THE MANUFACTURE OF PLASTISOLS BY SPRAY DRYING AN AQUEOUS DISPERSION OF SAID POLYMER WITH A CARRIER GAS THROUGH A TWO-FLUID ATOMIZER INTO A WATER-EVAPORATING ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES SPRAYING WITH 1.6-5.0 KG OF CARRIER GAS PER KG OF SAID DISPERSION TO FORM DRY POWDERY POLYMER PARTICLES CONTAINING LESS THAN 2 WT.% PARTICLES HAVING A DIAMETER GREATER THAN 40 $
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein said polymer dispersion is sprayed at a rate of 80-100 kg/hr.
Claim 4
Dependent Claim
23 words
A process according to claim 1 wherein said carrier gas is sprayed at a rate of 1.7-3.0 kg per kg of said dispersion.
Claim 5
Dependent Claim
18 words
A process according to claim 3 wherein said polymer dispersion is sprayed at a rate of 80-100 kg/hr.
Claim 6
Dependent Claim
46 words
A process according to claim 1 wherein said spray drying is effected with the carrier gas at a superatmospheric pressure of 1-10 atmospheres gauge, and wherein saiD water-evaporating atmosphere is a spray drying tower having an inlet temperature of 140*-190*C and an outlet temperature of 50*-90*C.
Claim 7
Dependent Claim
12 words
A process according to claim 5, wherein said polymer is polyvinyl chloride.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein said polymer dispersion is sprayed at a rate of 60-150 kg per hour.
Claim 9
Dependent Claim
20 words
A process according to claim 3 wherein said polymer dispersion is sprayed at a rate of 60-150 kg per hour.
Claim 10
Dependent Claim
21 words
A process according to claim 5 wherein said polymer dispersion is sprayed at a rate of 60- 150 kg per hour.
Claim 11
Dependent Claim
23 words
A process according to claim 9 wherein said carrier gas is sprayed at a rate of 1.7-3.0 kg per kg of said dispersion.
Claim 12
Dependent Claim
12 words
A process according to claim 10 wherein said polymer is polyvinyl chloride.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |