US4462920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-based hydraulic fluids
Assignee: Dow Chemical Co
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Filing: 1983-06-06
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Granted: 1984-07-31
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Expires: 2003-06-06
Abstract
Abstract Substantially oil-free aqueous industrial fluids possess superior lubricating and wear preventing characteristics and are useful as hydraulic fluids and metalworking compositions. Fluids of the invention comprise (1) an aqueous liquid and (2) a water-soluble synthetic addition polymer of (a) an ethylenically unsaturated crosslinking monomer, (b) an ethylenically unsaturated water-soluble monomer, (c) an ethylenically unsaturated water-insoluble monomer and (d) an ethylenically unsaturated polyalkyleneoxy-containing monomer. The industrial fluids exhibit good Newtonian behavior and mechanical stability at high shear.
Inventors
- 👤 Kenneth L. Snyder, Jr.
- 👤 Kenneth L. Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:54
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M145/00; C10M145/02; C10M147/00; C10M149/00; C10M149/02; C10M151/00; C10M151/02; C10M2201/00; C10M2201/02; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2209/10; C10M2209/103; C10M2209/104; C10M2213/00; C10M2213/02; C10M2213/04; C10M2213/06; C10M2213/062; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/024; C10M2217/026; C10M2217/028; C10M2217/06; C10M2221/00; C10M2221/02; C10N; C10N2040/00; C10N2040/08; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A substantially oil-free hydraulic fluid or metalworking composition which maintains a Newtonian and shear stable viscosity comprising an aqueous liquid and a substantially water-swellable synthetic addition polymer comprising the reaction product of (1) at least one water-soluble ethylenically unsaturated monomer in an amount sufficient to provide swellability to said polymer, (2) at least one water-insoluble ethylenically unsaturated monomer in an amount sufficient to control the degree of swellability of said polymer, (3) at least one ethylenically unsaturated polyalkyleneoxy-containing monomer in an amount sufficient to impart thickening efficiency to the polymer at high shear rates while not suffering significant deformation, and (4) at least one polyvinyl crosslinking monomer in an amount sufficient to control the degree of swellability of said copolymer while imparting mechanical reinforcement to said polymer.
Claim 2
Dependent Claim
127 words
A substantially oil-free hydraulic fluid or metalworking composition which maintains a Newtonian and shear stable viscosity comprising an aqueous liquid and a substantially water-swellable synthetic addition polymer comprising the reaction product of (1) at least one water-soluble ethylenically unsaturated monomer in an amount sufficient to provide swellability to said polymer, (2) at least one water-insoluble ethylenically unsaturated monomer in an amount sufficient to control the degree of swellability of said polymer, (3) at least one ethylenically unsaturated polyalkyleneoxy-containing monomer in an amount sufficient to impart thickening efficiency to the polymer at high shear rates while not suffering significant deformation, and (4) at least one polyvinyl crosslinking monomer in an amount sufficient to control the degree of swellability of said copolymer while imparting mechanical reinforcement to said polymer.
Claim 3
Dependent Claim
94 words
A substantially oil-free hydraulic fluid or metalworking composition of claim 1 comprising about 85 to about 99.9 weight percent of an aqueous liquid and about 0.1 to about 15 weight percent of a water-swellable synthetic addition copolymer comprising (1) about 0.01 to about 10 weight percent of said polyvinyl crosslinking monomer, (2) about 15 to about 75 weight percent of said water-soluble ethylenically unsaturated monomer, (3) about 15 to about 95 weight percent of said ethylenically unsaturated water-insoluble monomer, and (4) about 0.5 to about 25 weight percent of said ethylenically unsaturated polyalkyleneoxy-containing monomer.
Claim 4
Dependent Claim
96 words
A substantially oil-free hydraulic fluid or metalworking composition of claim 1 comprising about 85 to about 99.9 weight percent of an aqueous liquid and about 0.1 to about 15 weight percent of a water-swellable synthetic addition polymer consisting essentially of (1) about 0.01 to about 1 weight percent of said polyvinyl crosslinking monomer, (2) about 20 to about 70 weight percent of said water-soluble ethylenically unsaturated monomer, (3) about 30 to about 80 weight percent of said ethylenically unsaturated water-insoluble monomer, and (4) about 1 to about 10 weight percent of said ethylenically unsaturated polyalkyleneoxy-containing monomer.
Claim 5
Dependent Claim
33 words
A hydraulic fluid or metalworking composition of claim 3 comprising about 90 to about 99 weight percent aqueous liquid and about 1 to about 10 weight percent of said water-swellable synthetic addition polymer.
Claim 6
Dependent Claim
17 words
A hydraulic fluid or metalworking composition of claim 1 having a pH of at least about 7.
Claim 7
Dependent Claim
34 words
A hydraulic fluid or metalworking composition of claim 1 wherein said water-soluble monomer is a member selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, maleic anhydride, methacrylamide and dimethyl aminoethyl methacrylate.
Claim 8
Dependent Claim
39 words
A hydraulic fluid or metalworking composition of claim 1 wherein said water-insoluble ethylenically unsaturated monomer is a member selected from the group consisting of styrene, α-methyl styrene, methylacrylate, butylacrylate, ethylacrylate, methylmethacrylate, ethylmethacrylate, acrylonitrile, methacrylonitrile, vinyl chloride and vinylidene chloride.
Claim 9
Dependent Claim
31 words
A hydraulic fluid or metalworking composition of claim 1 wherein said crosslinking monomer is a member selected from the group consisting of allyl acrylate and allyl methacrylate, N,N'-methylene diacrylamide and divinylbenzene.
Claim 10
Dependent Claim
49 words
A hydraulic fluid or metalworking composition of claim 1 wherein said polyalkyleneoxy-containing monomer is: ##STR10## wherein R and R 1 are H or CH 3 ; Y 1 is hydrogen or an alkyl containing between 1 and about 9 carbon atoms, and n is about 4 to about 100.
Claim 11
Dependent Claim
57 words
A hydraulic fluid or metalworking composition of claim 1 wherein said polyalkyleneoxy-containing monomer is: ##STR11## wherein R 1 is hydrogen or methyl, R 5 is --CH 2 --, R 3 is ethylene, R 4 is hydrogen or alkyl or branched alkyl containing between 1 and about 8 carbon atoms, and n is about 5 to about 100.
Claim 12
Dependent Claim
43 words
A hydraulic fluid or metalworking composition of claim 1 wherein said synthetic addition copolymer comprises (1) about 0.4 weight percent allyl methacrylate, (2) about 68 weight percent ethylacrylate, (3) about 13.1 weight percent methacrylic acid, and (4) about 18.5 weight percent decaethyleneglycol monomethacrylate.
Claim 13
Dependent Claim
17 words
A hydraulic fluid or metalworking composition of claim 1 wherein said aqueous liquid contains an anti-foaming agent.
Claim 14
Dependent Claim
17 words
A hydraulic fluid or metalworking composition of claim 1 wherein said aqueous liquid contains a lubricity aid.
Claim 15
Dependent Claim
17 words
A hydraulic fluid or metalworking composition of claim 1 wherein said aqueous liquid contains a corrosion inhibitor.
Claim 16
Dependent Claim
18 words
A hydraulic fluid or metalworking composition of claim 1 wherein said aqueous liquid contains an extreme pressure additive.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |