Patent US5368761A successfully refreshed from Google Patents.
US5368761A
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Copolymer useful as a pour point depressant for a lubricating oil
Assignee: Evonik Oil Additives GmbH
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Filing: 1994-02-15
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Granted: 1994-11-29
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Expires: 2014-02-15
Abstract
Abstract A copolymer useful as a pour point depressant for hydrocarbon lubricating oils includes from about 15 mole percent to about 67 mole percent comonomeric units derived from a (C8-C15) alkyl (meth)acrylate monomer, from about 3 mole percent to about 40 mole percent comonomeric units derived from a (C16-C24) alkyl (meth)acrylate monomers and from greater than 30 mole percent to about 65 mole percent comonomeric units derived from a (C1-C4)alkyl (meth)acrylate monomer.
Inventors
- 👤 Robert H. Gore
- 👤 James H. O'Mara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:55
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1804; C08F220/1818; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
221 words
A lubricating oil composition, comprising a lubricating oil base stock and from about 0.05 weight percent to about 1.0 weight percent of a random copolymer, said copolymer comprising: from about 15 mole percent to about 67 mole percent first repeating units, each of said first repeating units having the structural formula: ##STR7## wherein each occurrence of R 1 is independently H or methyl and each occurrence of R 2 is independently selected from the group consisting of (C 8 -C 15 )alkyl; from about 3 mole percent to about 40 mole percent second repeating units, each of said second repeating units having the structural formula: ##STR8## wherein each occurrence of R 3 is independently H or methyl and each occurrence of R 4 is independently selected from the group consisting of (C 16 -C 24 ) alkyl; and from greater than 30 mole percent to about 65 mole percent third repeating units, each of said third repeating units having the structural formula: ##STR9## wherein each occurrence of R 5 is independently H or methyl and each occurrence of R 6 is independently selected from the group consisting of (C 1 -C 4 ) alkyl; and said copolymer having a number average molecular weight of about 20,000 to about 80,000 and a weight average molecular weight of about 50,000 to about 200,000.
Claim 2
Dependent Claim
221 words
A lubricating oil composition, comprising a lubricating oil base stock and from about 0.05 weight percent to about 1.0 weight percent of a random copolymer, said copolymer comprising: from about 15 mole percent to about 67 mole percent first repeating units, each of said first repeating units having the structural formula: ##STR7## wherein each occurrence of R 1 is independently H or methyl and each occurrence of R 2 is independently selected from the group consisting of (C 8 -C 15 )alkyl; from about 3 mole percent to about 40 mole percent second repeating units, each of said second repeating units having the structural formula: ##STR8## wherein each occurrence of R 3 is independently H or methyl and each occurrence of R 4 is independently selected from the group consisting of (C 16 -C 24 ) alkyl; and from greater than 30 mole percent to about 65 mole percent third repeating units, each of said third repeating units having the structural formula: ##STR9## wherein each occurrence of R 5 is independently H or methyl and each occurrence of R 6 is independently selected from the group consisting of (C 1 -C 4 ) alkyl; and said copolymer having a number average molecular weight of about 20,000 to about 80,000 and a weight average molecular weight of about 50,000 to about 200,000.
Claim 3
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 25 mole percent to about 60 mole percent first repeating units.
Claim 4
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 25 mole percent to about 40 mole percent first repeating units.
Claim 5
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 10 mole percent to about 35 mole percent second repeating units.
Claim 6
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 15 mole percent to about 30 mole percent second repeating units.
Claim 7
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 32 mole percent to about 50 mole percent third repeating units.
Claim 8
Dependent Claim
22 words
The composition of claim 1, wherein the copolymer comprises from about 35 mole percent to about 45 mole percent third repeating units.
Claim 9
Dependent Claim
17 words
The composition of claim 1 wherein R 1 , R 3 and R 5 are each methyl.
Claim 10
Dependent Claim
21 words
The composition of claim 1 wherein R 4 is selected from the group consisting of stearyl, cetyl, eicosyl and mixtures thereof.
Claim 11
Dependent Claim
23 words
The composition of claim 1, wherein R 2 is selected from the group consisting of isodecyl, lauryl, tridecyl, myristyl, pentadecyl and mixtures thereof.
Claim 12
Dependent Claim
21 words
The composition of claim 1, wherein R 6 is selected from the group consisting of methyl, n-butyl, isobutyl and mixtures thereof.
Claim 13
Dependent Claim
10 words
The composition of claim 11, wherein R 6 is methyl.
Claim 14
Dependent Claim
20 words
The composition of claim 1, wherein the copolymer has a number average molecular weight from about 25,000 to about 70,000.
Claim 15
Dependent Claim
20 words
The composition of claim 1, wherein the copolymer has a number average molecular weight from about 28,000 to about 60,000.
Claim 16
Dependent Claim
20 words
The composition of claim 1, wherein the copolymer has a weight average molecular weight from about 50,000 to about 175,000.
Claim 17
Dependent Claim
20 words
The composition of claim 1, wherein the copolymer has a weight average molecular weight from about 50,000 and about 100,000.
Claim 18
Dependent Claim
23 words
The composition of claim 1, wherein each of the first repeating units is derived from a (C 8 -C 15 )alkyl methacrylate monomer.
Claim 19
Dependent Claim
34 words
The composition of claim 17, wherein the (C 8 -C 15 ) methacrylate monomer is selected from the group consisting of isodecyl methacrylate, lauryl methacrylate, tridecyl methacrylate, myristyl methacrylate, pentadecyl methacrylate and mixtures thereof.
Claim 20
Dependent Claim
23 words
The composition of claim 1, wherein each of the second repeating units is derived from a (C 16 -C 24 )alkyl methacrylate monomer.
Claim 21
Dependent Claim
30 words
The composition of claim 19, wherein the (C 16 -C 24 )alkyl methacrylate monomer is selected from the group consisting of stearyl methacrylate, cetyl methacrylate, eicosyl methacrylate and mixtures thereof.
Claim 22
Dependent Claim
23 words
The composition of claim 1, wherein each of the third repeating units is derived from a (C 1 -C 4 )alkyl methacrylate monomer.
Claim 23
Dependent Claim
30 words
The composition of claim 21, wherein the (C 1 -C 4 )alkyl methacrylate monomer is selected from the group consisting of methyl methacrylate, n-butyl methacrylate, isobutyl methacrylate and mixtures thereof.
Claim 24
Dependent Claim
17 words
The composition of claim 22, wherein the (C 1 -C 4 )alkyl methacrylate monomer is methyl methacrylate.
Claim 25
Dependent Claim
40 words
The composition of claim 1, comprising about 43.9 mole percent first repeating units derived from lauryl methacrylate, about 14.7 mole percent second repeating units derived from cetyl-eicosyl methacrylate and about 41.4 mole percent third repeating units derived from methyl methacrylate.
Claim 26
Dependent Claim
40 words
The composition of claim 1, comprising about 35.2 mole percent first repeating units derived from lauryl methacrylate, about 22.5 mole percent second repeating units derived from cetyl-eicosyl methacrylate and about 42.3 mole percent third repeating units derived from methyl methacrylate.
References Cited (Backward Citations)
US4822508A
Cited
US5112509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |