US4040996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of incorporating processing additives in polyvinyl chloride resins and emulsion for use therein
Assignee: CNA Holdings LLC
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Filing: 1976-03-09
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Granted: 1977-08-09
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Expires: 1996-03-09
Abstract
Abstract Processing additives are incorporated in polyvinyl chloride resins to form molding compositions by preparing an aqueous emulsion wherein the additives such as lubricants and stabilizers are in the disperse phase and then mixing an aliquot portion of the emulsion with a polyvinyl chloride resin powder in a high shear mixer to incorporate the additives in the resin in the proper proportions. By using an aqueous emulsion of the additives, the need for separately weighing each additive to be added to each batch of polyvinyl chloride is avoided and uniform dispersion of the additives in the resin achieved. The heat generated during the mixing process evaporates most of the water of the emulsion and the relatively small amount of retained water improves the anti-static properties of the molding composition.
Inventors
- 👤 Nicolaas C. Van Vonno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:58
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/20; C08J3/205; C08J3/2053; C08J3/22; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08K5/00; C08K5/04; C08K5/09; C08K5/56; C08K5/57; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L91/00; C08L91/06; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2391/00; C08J2391/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
The method of making a polyvinyl chloride molding composition which comprises adding to a body of particulate polyvinyl chloride an aqueous emulsion of a lubricating amount of a processing lubricant and a stabilizing amount of a stabilizer and mixing the resulting mixture at an elevated temperature to evaporate the water of the emulsion and coat the polyvinyl chloride particles with said lubricant and stabilizer.
Claim 2
Independent Claim
64 words
The method of making a polyvinyl chloride molding composition which comprises adding to a body of particulate polyvinyl chloride an aqueous emulsion of a lubricating amount of a processing lubricant and a stabilizing amount of a stabilizer and mixing the resulting mixture at an elevated temperature to evaporate the water of the emulsion and coat the polyvinyl chloride particles with said lubricant and stabilizer.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein said lubricant is a hydrocarbon wax.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax and montan derived acid wax.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax and oxidized polyethylene wax.
Claim 6
Dependent Claim
23 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax, oxidized polyethylene wax and montan derived acid wax.
Claim 7
Dependent Claim
25 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax and an alkaline earth metal salt of an organic acid.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax and calcium stearate.
Claim 9
Dependent Claim
13 words
A method according to claim 1 wherein said stabilizer is an organo-tin stabilizer.
Claim 10
Dependent Claim
23 words
A method according to claim 1 wherein the emulsion is used to the extent of 2% to 10% by weight of the PVC.
Claim 11
Dependent Claim
40 words
A composition adapted to be used in incorporating processing additives into polyvinyl chloride comprising an aqueous emulsion of from 10% to 45% by weight of a polyvinyl chloride processing lubricant and from 3% to 30% by weight of a stabilizer.
Claim 12
Dependent Claim
40 words
A composition adapted to be used in incorporating processing additives into polyvinyl chloride comprising an aqueous emulsion of from 10% to 45% by weight of a polyvinyl chloride processing lubricant and from 3% to 30% by weight of a stabilizer.
Claim 13
Dependent Claim
13 words
A composition according to claim 10 wherein said lubricant is a hydrocarbon wax.
Claim 14
Dependent Claim
23 words
A composition according to claim 11 wherein said lubricant comprises a hydrocarbon wax and calcium stearate and said stabilizer is an organo-tin stabilizer.
Claim 15
Dependent Claim
38 words
A composition adapted to be used in incorporating processing additives into polyvinyl chloride comprising an aqueous emulsion of 30% to 40% by weight of polyvinyl chloride processing lubricant and from 10% to 15% by weight of a stabilizer.
Claim 16
Dependent Claim
38 words
A composition adapted to be used in incorporating processing additives into polyvinyl chloride comprising an aqueous emulsion of 30% to 40% by weight of polyvinyl chloride processing lubricant and from 10% to 15% by weight of a stabilizer.
Claim 17
Dependent Claim
20 words
A composition according to claim 12 wherein said emulsion contains from 0.1% to 5% by weight of an emulsifying agent.
Claim 18
Dependent Claim
15 words
A composition according to claim 13 wherein said emulsifying agent is an aqueous inorganic alkali.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |