US4040997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for incorporating processing additives in polyvinyl chloride resins and additive concentrate 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 resin by preparing an additive concentrate in free-flowing powder form and mixing an aliquot portion thereof with a batch of polyvinyl chloride powder in a high shear mixer to form a molding composition containing the additives in the desired proportions. The additive concentrate is made by preparing an aqueous emulsion of the lubricants and stabilizers which is then mixed with solid additives such as pigments and fillers to form the free-flowing additive concentrate powder. By using the additive concentrate the need for individual weighing of each additive to be added to each batch of polyvinyl chloride resin is avoided.
Inventors
- 👤 Nicolaas C. Van Vonno
- 👤 John O. Allaire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; 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; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
89 words
The method of making a polyvinyl chloride molding composition which comprises preparing an aqueous emulsion containing from 10% to 45% by weight of a processing lubricant and from 3% to 30% by weight of stabilizer, mixing said emulsion with a finely divided particulate solid selected from fillers, pigments and mixtures thereof to form an additive concentrate in the form of a free-flowing powder containing no more than 30% by weight of water and mixing a portion of said concentrate with polyvinyl chloride to form said polyvinyl chloride molding composition.
Claim 2
Independent Claim
89 words
The method of making a polyvinyl chloride molding composition which comprises preparing an aqueous emulsion containing from 10% to 45% by weight of a processing lubricant and from 3% to 30% by weight of stabilizer, mixing said emulsion with a finely divided particulate solid selected from fillers, pigments and mixtures thereof to form an additive concentrate in the form of a free-flowing powder containing no more than 30% by weight of water and mixing a portion of said concentrate with polyvinyl chloride to form said polyvinyl chloride molding composition.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein said lubricant is a hydrocarbon wax.
Claim 4
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 5
Dependent Claim
14 words
A method according to claim 1 and wherein said stabilizer is an organo-tin stabilizer.
Claim 6
Dependent Claim
24 words
A method according to claim 1 and wherein said lubricant comprises a hydrocarbon wax and an alkaline earth metal salt of an organic acid.
Claim 7
Dependent Claim
18 words
A method according to claim 1 wherein said lubricant is a mixture of hydrocarbon wax and calcium stearate.
Claim 8
Dependent Claim
27 words
A method according to claim 1 wherein said emulsion contains from 30% to 40% by weight of lubricant and from 10% to 15% by weight of stabilizer.
Claim 9
Dependent Claim
12 words
A method according to claim 1 wherein said pigment is titanium dioxide.
Claim 10
Dependent Claim
12 words
A method according to claim 1 wherein said filler is calcium carbonate.
Claim 11
Dependent Claim
16 words
A method according to claim 1 wherein said finely divided particulate solid includes an impact modifier.
Claim 12
Dependent Claim
16 words
A method according to claim 1 wherein said finely divided particulate solid includes a processing aid.
Claim 13
Dependent Claim
45 words
A polyvinyl chloride additive concentrate in the form of a free-flowing powder and consisting of a finely divided particulate substrate selected from pigments, fillers and mixtures thereof having a mixture of polyvinyl chloride processing lubricant and stabilizer deposited on the surfaces of the substrate particles.
Claim 14
Dependent Claim
45 words
A polyvinyl chloride additive concentrate in the form of a free-flowing powder and consisting of a finely divided particulate substrate selected from pigments, fillers and mixtures thereof having a mixture of polyvinyl chloride processing lubricant and stabilizer deposited on the surfaces of the substrate particles.
Claim 15
Dependent Claim
19 words
An additive concentrate according to claim 12 wherein said substrate comprises a mixture of titanium dioxide and calcium carbonate.
Claim 16
Dependent Claim
21 words
An additive concentrate according to claim 12 wherein said processing lubricant is a wax and said stabilizer is an organo-tin compound.
Claim 17
Independent Claim
65 words
The method of making a polyvinyl chloride additive concentrate which comprises preparing an aqueous emulsion containing from 10% to 45% by weight of processing lubricant and from 3% to 30% by weight of stabilizer, and mixing said emulsion with a finely divided particulate solid selected from fillers, pigments and mixtures thereof to form a free-flowing powder containing no more than 30% by weight of water.
Claim 18
Independent Claim
65 words
The method of making a polyvinyl chloride additive concentrate which comprises preparing an aqueous emulsion containing from 10% to 45% by weight of processing lubricant and from 3% to 30% by weight of stabilizer, and mixing said emulsion with a finely divided particulate solid selected from fillers, pigments and mixtures thereof to form a free-flowing powder containing no more than 30% by weight of water.
Claim 19
Dependent Claim
22 words
A method according to claim 15 wherein the processing lubricant comprises one or more waxes and the stabilizer is an organo-tin compound.
Claim 20
Dependent Claim
18 words
A method according to claim 15 wherein said filler is calcium carbonate and said pigment is titanium dioxide.
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 |