US4816172A
Expired / Lapsed
US
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Clear high-performance multifunction VI improvers
Assignee: Afton Chemical Additives Corp
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Filing: 1987-11-18
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Granted: 1989-03-28
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Expires: 2007-11-18
Abstract
Abstract This invention is a method of producing a clear, high-performance dispersant/antioxidant VII. The method comprising admixing a polar modifier to a VI improver during preparation process or to final product at a sufficiently high temperature to produce the desired clear, high performance VI improver.
Inventors
- 👤 Maria M. Kapuscinski
- 👤 Larry D. Grina
- 👤 Lee A. Brugger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
C; C10; C10M; C10M161/00; C08; C08F; C08F255/00; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2462; C10M129/00; C10M129/02; C10M129/68; C10M129/72; C10M133/00; C10M133/52; C10M133/56; C10M145/00; C10M145/18; C10M145/24; C10M145/26; C10M145/30; C10M145/36; C10M151/00; C10M151/02; C10M157/00; C10M157/06; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/284; C10M2207/285; C10M2207/286; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/108; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/04; C10M2217/046; C10M2217/06; C10M2221/00; C10M2221/02; C10M2221/04; C10M2221/041; C10N; C10N2040/00; C10N2040/135; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
135 words
A method for making a clear, high-performing dispersant/antioxidant viscosity index improver comprising: (a) mixing about 1-40 parts of a dispersant monomer and about 0.2 to about 10 parts of a free-radical initiator with about 100 parts of a heated polymer solution and performing a grafting reaction of monomer onto polymer, said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 120 minutes; (b) adding about 1-40 parts of an antioxidant monomer, about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a polar modifier to said reaction mixture to perform grafting reaction to produce a clear, high-performance dispersant/antioxidant viscosity index improver and recovering; and (c) recovering the dispersant/antioxidant viscosity index improver product.
Claim 2
Independent Claim
135 words
A method for making a clear, high-performing dispersant/antioxidant viscosity index improver comprising: (a) mixing about 1-40 parts of a dispersant monomer and about 0.2 to about 10 parts of a free-radical initiator with about 100 parts of a heated polymer solution and performing a grafting reaction of monomer onto polymer, said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 120 minutes; (b) adding about 1-40 parts of an antioxidant monomer, about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a polar modifier to said reaction mixture to perform grafting reaction to produce a clear, high-performance dispersant/antioxidant viscosity index improver and recovering; and (c) recovering the dispersant/antioxidant viscosity index improver product.
Claim 3
Independent Claim
103 words
A method of producing a clear, high performance dispersant/antioxidant viscosity index improver comprising: (a) reaction 100 parts of a polymer base, 1-40 parts of a dispersant monomer, 1-40 parts of an anti-oxidant monomer in the presence of about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a prior modifier to provide a clear, high performance dispersant/antioxidant viscosity index improver, said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 120 minutes; and (b) recovering the viscosity index improver product.
Claim 4
Independent Claim
103 words
A method of producing a clear, high performance dispersant/antioxidant viscosity index improver comprising: (a) reaction 100 parts of a polymer base, 1-40 parts of a dispersant monomer, 1-40 parts of an anti-oxidant monomer in the presence of about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a prior modifier to provide a clear, high performance dispersant/antioxidant viscosity index improver, said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 120 minutes; and (b) recovering the viscosity index improver product.
Claim 5
Independent Claim
74 words
A method of making a clear, high-performance dispersant/anti-oxidant viscosity index improver comprising: (a) heating a dispersant/anti-oxidant viscosity index improver with about 0.5 to about 10 parts of a polar modifier to produce a clear high-performance dispersant/anti-oxidant viscosity index improver product said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 20 minutes; and (b) recovering said viscosity index improver product.
Claim 6
Independent Claim
74 words
A method of making a clear, high-performance dispersant/anti-oxidant viscosity index improver comprising: (a) heating a dispersant/anti-oxidant viscosity index improver with about 0.5 to about 10 parts of a polar modifier to produce a clear high-performance dispersant/anti-oxidant viscosity index improver product said reaction being carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 20 minutes; and (b) recovering said viscosity index improver product.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said polymer is a copolymer of ethylene-propylene or a ethylene-propylene-diene terpolymer.
Claim 8
Dependent Claim
11 words
The method of claim 1, wherein said dispersant monomer is N-vinylpyrrolidone.
Claim 9
Dependent Claim
11 words
The method of claim 1, wherein said antioxidant monomer is phenothiazine.
Claim 10
Dependent Claim
27 words
The method of claim 1, wherein said free radical initiator is selected from the group consisting of dicumyl peroxide, di-t-butyl peroxide, benzoyl peroxide, diisopropyl peroxide and azobisisobutyronitrile.
Claim 11
Dependent Claim
12 words
The method of claim 7, wherein said free-radical indicator is dicumyl peroxide.
Claim 12
Dependent Claim
24 words
The method of claim 1, wherein said modifier is selected from the group consisting of lubricant dispersants, polypropylene glycols, ester-type synthetic oils and plasticizers.
Claim 13
Dependent Claim
35 words
The method of claim 1, wherein said polar modifier is selected from the group consisting of a lubricant dispersant based on polyisobutylene succinimide derivetized with pentaethylenehexamine, tetraethylene pentamine, glycolated pentaethylenehexamine, glycolated tetraethylenepentamine and polypropylene glycols.
Claim 14
Dependent Claim
32 words
The method of claim 1, wherein the process was carried out at a temperature of about 150° C. to about 165° C. for a period of about 5 to about 120 minutes.
Claim 15
Dependent Claim
23 words
The method of claim 1, wherein the weight ratio of the modifier to the anti-oxidant monomer is from about 0.02 to about 20.0.
Claim 16
Dependent Claim
25 words
The method of claim 1, wherein the modifier is present in the amount of about 0.04 to about 40.0 parts per 100 parts of polymer.
Claim 17
Dependent Claim
32 words
The method of claim 3, wherein the process was carried out at a temperature of about 50° C. to about 200° C. for a period of about 5 to about 120 minutes.
Claim 18
Dependent Claim
18 words
The method of claim 3, wherein said weight ratio to antioxidant is from about 20 to about 0.5.
Claim 19
Dependent Claim
22 words
The method of claim 1 wherein said dispersant monomer is selected from the group consisting of N-vinyl-pyrrolidone, 1-vinylimidazole, 4-vinylpyridine and allyl amine.
Claim 20
Independent Claim
54 words
A method of producing a clear, high-performance dispersant/antioxidant viscosity index improver comprising admixing a polar modifier to a viscosity index improver which is based on a oil-soluble, substantially linear carbon-carbon backbone polymer grafted with a dispersant monomer and an antioxidant monomer containing at least one of sulfur, nitrogen or oxygen in a heterocyclic ring.
Claim 21
Independent Claim
54 words
A method of producing a clear, high-performance dispersant/antioxidant viscosity index improver comprising admixing a polar modifier to a viscosity index improver which is based on a oil-soluble, substantially linear carbon-carbon backbone polymer grafted with a dispersant monomer and an antioxidant monomer containing at least one of sulfur, nitrogen or oxygen in a heterocyclic ring.
Claim 22
Dependent Claim
27 words
The method of claim 17 wherein said polar modifier is admixed with said polymer with N-vinyl pyrrolidone as a dispersant monomer and phenothiazine as an antioxidant monomer.
Claim 23
Dependent Claim
19 words
The method of claim 18 wherein said polar modifier is admixed to the heated final viscosity index improver product.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |