US4340691A — Linear organo carbonate coupling agents for livin…

Claim 1

Independent Claim 162 words

A process for the preparation of block copolymers of vinyl-substituted aromatic compounds and conjugated dienes of broadened molecular weight distribution comprising: (a) polymerizing a vinyl-substituted aromatic compound in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete, (b) adding one or more conjugated diene monomers and polymerizing until substantially complete conversion of monomer(s) to polymer has taken place, and (c) reacting the resulting block copolymer from said steps (a) and (b) with a coupling agent of the general formula ##STR7## wherein R 1 and R 2 are same or different and are selected from a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur, X is carbon or sulfur, with the stipulation that when X is sulfur Y must be oxygen, in an amount of from 0.2 to 3 moles of coupling agent per mole of said organoalkali metal or organomagnesium initiator.

Claim 2

Dependent Claim 162 words

A process for the preparation of block copolymers of vinyl-substituted aromatic compounds and conjugated dienes of broadened molecular weight distribution comprising: (a) polymerizing a vinyl-substituted aromatic compound in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete, (b) adding one or more conjugated diene monomers and polymerizing until substantially complete conversion of monomer(s) to polymer has taken place, and (c) reacting the resulting block copolymer from said steps (a) and (b) with a coupling agent of the general formula ##STR7## wherein R 1 and R 2 are same or different and are selected from a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur, X is carbon or sulfur, with the stipulation that when X is sulfur Y must be oxygen, in an amount of from 0.2 to 3 moles of coupling agent per mole of said organoalkali metal or organomagnesium initiator.

Claim 3

Dependent Claim 61 words

A process according to claim 1, wherein in the first step (a) the monomer is selected from the group consisting of styrene, α-methylstyrene, p-isopropyl α-methylstyrene, vinyl toluene, chlorostyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, and the initiator is an organolithium or organosodium compound, and in the second step (b) the diene monomer is selected from the group consisting of 1,3-butadiene, isoprene, piperylene, 2-ethyl-1,3-butadiene, and 2,3-dimethylbutadiene.

Claim 4

Dependent Claim 57 words

The process according to claim 1 wherein in the first step (a) the initiator is an organolithium compound and in the third step (c) the coupling agent is selected from the group consisting of dimethyl carbonate, diethyl carbonate, diisobutyl carbonate, diphenyl carbonate, O,O-diethyl thiocarbonate, O,S-diethyl thiocarbonate, S,S-diethyl dithiocarbonate, O,S-diethyl dithiocarbonate, diethyltrithiocarbonate, diphenyltrithiocarbonate, dimethyl sulfite and diphenyl sulfite.

Claim 5

Dependent Claim 25 words

The process according to claim 1, wherein the organolithium initiator is selected from the group consisting of n-butyllithium, sec-butyllithium, phenyllithium, 1,4-dilithio-1,1,4,4-tetraphenylbutane, 1,4-dilithio-1,4-dimethyl-2-butene, DiLi-1 and DiLi-3.

Claim 6

Dependent Claim 25 words

The process according to claim 3, wherein the organolithium initiator is selected from the group consisting of n-butyllithium, sec-butyllithium, phenyllithium, 1,4-dilithio-1,1,4,4-tetraphenylbutane, 1,4-dilithio-1,4-dimethyl-2-butene, DiLi-1 and DiLi-3.

Claim 7

Dependent Claim 30 words

The process of claim 1, wherein the vinyl-substituted monomer is styrene, the conjugated diene is butadiene, the polymerization initiator is an organolithium compound, and the coupling agent is diethyl carbonate.

Claim 8

Dependent Claim 156 words

Block copolymers of vinyl-substituted aromatic compounds and conjugated dienes of broadened molecular weight distribution comprising: (a) polymerizing a vinyl-substituted aromatic compound in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete, (b) adding one or more conjugated diene monomers and polymerizing until substantially complete conversion of monomer(s) to polymer has taken place, and (c) reacting the resulting block copolymer from said steps (a) and (b) with a coupling agent of the general formula ##STR8## wherein, R 1 and R 2 are the same or different and are selected from a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur, X is carbon or sulfur, with the stipulation that when X is sulfur, Y must be oxygen, in an amount of from 0.2 to 3 moles of coupling agent per mole of said organoalkali or organomagnesium initiator.

Claim 9

Dependent Claim 156 words

Block copolymers of vinyl-substituted aromatic compounds and conjugated dienes of broadened molecular weight distribution comprising: (a) polymerizing a vinyl-substituted aromatic compound in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete, (b) adding one or more conjugated diene monomers and polymerizing until substantially complete conversion of monomer(s) to polymer has taken place, and (c) reacting the resulting block copolymer from said steps (a) and (b) with a coupling agent of the general formula ##STR8## wherein, R 1 and R 2 are the same or different and are selected from a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur, X is carbon or sulfur, with the stipulation that when X is sulfur, Y must be oxygen, in an amount of from 0.2 to 3 moles of coupling agent per mole of said organoalkali or organomagnesium initiator.

Claim 10

Dependent Claim 61 words

Block copolymers according to claim 7, wherein in the first step (a) the monomer is selected from the group consisting of styrene, α-methylstyrene, p-isopropyl α-methylstyrene, vinyl toluene, chlorostyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, and the initiator is an organolithium or organosodium compound, and in the second step (b) the diene monomer is selected from the group consisting of 1,3-butadiene, isoprene, piperylene, 2-ethyl-1,3-butadiene, and 2,3-dimethylbutadiene.

Claim 11

Dependent Claim 53 words

Block copolymers according to claim 7, wherein in the first step (a) the initiator is an organolithium compound and in the third step (c) the coupling agent is selected from the group consisting of dimethyl carbonate, diethyl carbonate, diisobutyl carbonate, diphenyl carbonate, O,O-diethylthiocarbonate, O,S-diethylthiocarbonate, S,S-diethyldithiocarbonate, O,S-diethyldithiocarbonate, diethyltrithiocarbonate, diphenyltrithiocarbonate, dimethyl sulfite and diphenyl sulfite.

Claim 12

Dependent Claim 30 words

Block copolymers of claim 7, wherein the vinyl-substituted monomer is styrene, the conjugated diene is butadiene, the polymerization initiator is an organolithium compound, and the coupling agent is diethyl carbonate.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-07-19	1986-01-18	1986-07-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-07-19	1990-01-18	1990-07-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-07-19	1994-01-18	1994-07-20	$7700.00	Window Closed / Lapsed

Linear organo carbonate coupling agents for living polymers of conjugated dienes

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