US4388202A — Lubricating oil composition and process for prepa…

Claim 1

Independent Claim 181 words

A process for preparing a lubricating oil composition containing about 0.5 to about 40% by weight, based on the weight of the lubricating oil, of an oil-soluble graft copolymer, which comprises graft-copolymerizing in the presence of a radical initiator added thereto, a grafting monomer selected from the group consisting of (a) saturated esters of unsaturated monocarboxylic acids, (b) unsaturated esters of saturated carboxylic acids, and (c) unsaturated epoxy compounds with a lubricating oil and trunk copolymer selected from the group consisting of copolymers of alpha-olefins having 2 to 20 carbon atoms, and hydrogenated products of copolymers of styrene and diolefins and/or alpha-olefins having 2 to 20 carbon atoms, said trunk copolymer having (i) a number average molecular weight of about 5,000 to about 100,000, (ii) a carbon-carbon double bond content determined from its iodine value of not more than about 0.1, and (iii) an oxygen content of not more than about 0.3% by weight, thereby to form said oil-soluble graft copolymer having grafted thereto about 10 -2 to about 5 milliequivalents, per gram of the graft copolymer, of said grafting monomer.

Claim 2

Dependent Claim 181 words

A process for preparing a lubricating oil composition containing about 0.5 to about 40% by weight, based on the weight of the lubricating oil, of an oil-soluble graft copolymer, which comprises graft-copolymerizing in the presence of a radical initiator added thereto, a grafting monomer selected from the group consisting of (a) saturated esters of unsaturated monocarboxylic acids, (b) unsaturated esters of saturated carboxylic acids, and (c) unsaturated epoxy compounds with a lubricating oil and trunk copolymer selected from the group consisting of copolymers of alpha-olefins having 2 to 20 carbon atoms, and hydrogenated products of copolymers of styrene and diolefins and/or alpha-olefins having 2 to 20 carbon atoms, said trunk copolymer having (i) a number average molecular weight of about 5,000 to about 100,000, (ii) a carbon-carbon double bond content determined from its iodine value of not more than about 0.1, and (iii) an oxygen content of not more than about 0.3% by weight, thereby to form said oil-soluble graft copolymer having grafted thereto about 10 -2 to about 5 milliequivalents, per gram of the graft copolymer, of said grafting monomer.

Claim 3

Dependent Claim 25 words

The process set forth in claim 1 wherein said graft copolymerization is carried out at a temperature of about 80° C. to about 250° C.

Claim 4

Dependent Claim 17 words

The process set forth in claim 1 wherein said alpha-olefin copolymer is a rubbery copolymer of ethylene.

Claim 5

Dependent Claim 18 words

The process set forth in claim 3 wherein said rubbery copolymer of ethylene is an ethylene-propylene rubbery copolymer.

Claim 6

Dependent Claim 29 words

The process set forth in any one of claims 1 to 4 wherein said alpha-olefin copolymer has a melt index at 190° C. of about 0.1 to about 500.

Claim 7

Dependent Claim 27 words

The process set forth in claim 3 or 4 wherein said rubbery copolymer of ethylene has an ethylene content of about 40 to about 80 mole %.

Claim 8

Dependent Claim 22 words

The process set forth in claim 1 wherein said hydrogenated copolymer is a hydrogenation product of a copolymer of the styrene-diolefin-styrene type.

Claim 9

Dependent Claim 33 words

The process set forth in claim 7 wherein the diolefin of said hydrogenation product of a copolymer of the styrene-diolefin-styrene type is a diolefin selected from the group consisting of butadiene and isoprene.

Claim 10

Dependent Claim 34 words

The process set forth in claim 1 wherein said trunk copolymer does not substantially show an endothermic peak in differential scanning calorimetry and has a crystallinity determined by the X-ray diffraction method of 0%.

Claim 11

Dependent Claim 19 words

The process set forth in claim 1 wherein said esters (a) and (b) are alkyl and alkenyl esters, respectively.

Claim 12

Dependent Claim 25 words

The process set forth in claim 10 wherein the alkyl group in said esters (a) is an alkyl group having 1 to 18 carbon atoms.

Claim 13

Dependent Claim 19 words

The process set forth in claim 10 wherein the unsaturated monocarboxylic acid of the esters (a) is methacrylic acid.

Claim 14

Dependent Claim 23 words

The process of claim 10 wherein the alkenyl group in said esters (b) is an alkenyl group having 2 to 18 carbon atoms.

Claim 15

Dependent Claim 15 words

The process set forth in claim 13 wherein said alkenyl group is a vinyl group.

Claim 16

Dependent Claim 27 words

The process set forth in claim 10 wherein the saturated carboxylic acid of said esters (b) is an unsaturated carboxylic acid having 1 to 18 carbon atoms.

Claim 17

Dependent Claim 15 words

The process set forth in claim 15 wherein said saturated carboxylic acid is acetic acid.

Claim 18

Dependent Claim 24 words

The process of claim 1 wherein said epoxy compound (c) is a compound selected from the group consisting of glycidyl esters and glycidyl ethers.

Claim 19

Dependent Claim 29 words

The process set forth in claim 1 wherein said epoxy compound (c) is a compound selected from the group consisting of glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether.

Claim 20

Dependent Claim 46 words

The process set forth in claim 1 wherein the resulting product containing the oil-soluble graft copolymer is mixed with a lubricating oil to adjust the content of the graft copolymer to about 0.5 to about 40% by weight based on the weight of the lubricating oil.

Claim 21

Dependent Claim 178 words

A lubricating oil composition comprising a lubricating oil and about 0.5 to about 40% by weight, based on the weight of the lubricating oil, of an oil-soluble graft copolymer prepared by grafting in the presence of a radical initiator added thereto about 10 -2 to about 5 milliquivalents, per gram of the oil-soluble copolymer formed, of a grafting monomer selected from the group consisting of (a) saturated esters of unsaturated monocarboxylic acids, (b) unsaturated esters of saturated carboxylic acids, and (c) unsaturated epoxy compounds to both said lubricating oil substrate and a trunk copolymer selected from the group consisting of copolymers of alpha-olefins having 2 to 20 carbon atoms, copolymers of styrene and alpha-olefins having 2 to 20 carbon atoms and hydrogenated products of copolymers of styrene and diolefins, said trunk copolymer having (i) a number average molecular weight of about 5,000 to about 100,000, (ii) a carbon-carbon double bond content determined from its iodine value of not more than about 0.1 milliequivalent/g of copolymer, and (iii) an oxygen content of not more than about 0.3% by weight.

Claim 22

Dependent Claim 178 words

A lubricating oil composition comprising a lubricating oil and about 0.5 to about 40% by weight, based on the weight of the lubricating oil, of an oil-soluble graft copolymer prepared by grafting in the presence of a radical initiator added thereto about 10 -2 to about 5 milliquivalents, per gram of the oil-soluble copolymer formed, of a grafting monomer selected from the group consisting of (a) saturated esters of unsaturated monocarboxylic acids, (b) unsaturated esters of saturated carboxylic acids, and (c) unsaturated epoxy compounds to both said lubricating oil substrate and a trunk copolymer selected from the group consisting of copolymers of alpha-olefins having 2 to 20 carbon atoms, copolymers of styrene and alpha-olefins having 2 to 20 carbon atoms and hydrogenated products of copolymers of styrene and diolefins, said trunk copolymer having (i) a number average molecular weight of about 5,000 to about 100,000, (ii) a carbon-carbon double bond content determined from its iodine value of not more than about 0.1 milliequivalent/g of copolymer, and (iii) an oxygen content of not more than about 0.3% by weight.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-06-13	1986-12-13	1987-06-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-06-13	1990-12-13	1991-06-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-06-13	1994-12-13	1995-06-14	$7700.00	Window Closed / Lapsed

Lubricating oil composition and process for preparation thereof

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