Claims
- 1. An ashless dispersant having in its chemical structure at least one aliphatic hydrocarbyl substituent derived from a liquid, linear polymer of propylene, said polymer having stereo-irregularity and optionally containing up to 25 mol percent of ethylene or C.sub.4 to C.sub.10 monoolefin polymerized into the polymer chain, at least 60 mol percent of said polymer having a terminal vinylidene group, said dispersant being a product formed by reacting (i) an alkenyl succinic acylating agent having said substituent thereon and (ii) a basic salt of aminoguanidine wherein the molar ratio of said aminoguanidine to said acylating agent is in the range of about 1.4:1 to about 2.2:1 such that the product obtained upon reaction thereof exhibits a dominant infrared peak at 1640 cm.sup.-1.
- 2. An ashless dispersant according to claim 1 wherein said linear polymer of propylene is a propylene homopolymer.
- 3. An ashless dispersant according to claim 1 wherein said basic salt of aminoguanidine is aminoguanidine bicarbonate.
- 4. A lubricating oil composition containing from 0.5 to 60% by weight of an ashless dispersant of claim 1.
- 5. An ashless dispersant having in its chemical structure at least one aliphatic hydrocarbyl substituent derived from a liquid, linear polymer of propylene, said polymer having stereo-irregularity and optionally containing up to 25 mol percent of ethylene or C.sub.4 to C.sub.10 monoolefin polymerized into the polymer chain, at least 60 mol percent of said polymer having a terminal vinylidene group, said dispersant being a product formed by reacting (i) an alkenyl succinic acylating agent having said substituent thereon and (ii) a basic salt of aminoguanidine wherein the molar ratio of said aminoguanidine to said acylating agent is in the range of about 0.4:1 to about 1.3:1.
- 6. An ashless dispersant according to claim 5 wherein said product exhibits an infrared spectrum having peaks in the region of about 1580 and about 1690 cm.sup.-1.
- 7. An ashless dispersant according to claim 5 wherein said product exhibits an infrared spectrum having a peak in the region of about 1720 cm.sup.-1.
- 8. An ashless dispersant according to claim 5 wherein said linear polymer of propylene is a propylene homopolymer.
- 9. An ashless dispersant according to claim 5 wherein said basic salt of aminoguanidine is aminoguanidine bicarbonate.
- 10. A lubricating oil composition containing from 0.5 to 60% by weight of an ashless dispersant of claim 5.
Parent Case Info
This application is a divisional of application Ser. No. 077,724, filed Jun. 16, 1993, now U.S. Pat. No. 5,433,875.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4871465 |
Hutchison |
Oct 1989 |
|
4908145 |
Fenoglio |
Mar 1990 |
|
5080815 |
Fenoglio et al. |
Jan 1992 |
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5174915 |
Hutchison et al. |
Dec 1992 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
77724 |
Jun 1993 |
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