| Patent Number |
Title Of Patent |
Date Issued |
| RE32533 |
Hydrocarbon fuels with carburetor detergent properties |
October 27, 1987 |
| Carburetor detergency properties of hydrocarbon fuels are provided by nitrogen-containing organic compound-grafted, hydrogenated conjugated diene-monovinylarene copolymers. |
| 6265485 |
Tapered block copolymers of monovinylarenes and conjugated dienes |
July 24, 2001 |
| A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and mono |
| 6265484 |
Tapered block copolymers of monovinylarenes and conjugated dienes |
July 24, 2001 |
| A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and mono |
| 5910546 |
Tapered block copolymers of monivinylarenes and conjugated dienes |
June 8, 1999 |
| A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and mono |
| 5705569 |
Block copolymers of monovinylarenes and conjugated dienes and preparation thereof |
January 6, 1998 |
| A method for preparing resinous polymodal monovinylarene-conjugated diene block copolymers and polymers produced thereby are provided. The method comprises sequentially contacting under polymerization conditions:(a) a monovinylarene monomer and initiator;(b) initiator and a monovinylarene mo |
| 5587425 |
Blends of copolymers of monovinylarenes and conjugated dienes containing two interior tapered bl |
December 24, 1996 |
| A method for preparing blends of a copolymer in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monom |
| 5545690 |
Tapered block copolymers of monovinylarenes and conjugated dienes |
August 13, 1996 |
| A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and mono |
| 5436298 |
Block copolymers of monovinylarenes and conjugated dienes and preparation thereof |
July 25, 1995 |
| A method for preparing resinous polymodal monovinylarene-conjugated diene block copolymers and polymers produced thereby are provided. The method comprises sequentially contacting under polymerization conditions:(a) a monovinylarene monomer and initiator;(b) initiator and a monovinylarene mo |
| 5422389 |
Method for stabilizing monovinylarene/conjugated diene copolymers and a method for preparing a s |
June 6, 1995 |
| A process for stabilizing polymers is provided comprising:(1) contacting at least one hindered phenolic compound and an organic phosphite to form a stabilizing mixture,wherein said contacting is at a temperature sufficient to at least partially dissolve said hindered phenolic compound,wherei |
| 5399628 |
Block copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks |
March 21, 1995 |
| A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene mo |
| 5384349 |
Conjugated diene/monovinylarene copolymers and preparation thereof |
January 24, 1995 |
| A block copolymer comprising about 5 weight percent to about 95 weight percent monovinylarene monomer, about 95 to about 5 weight percent butadiene, and an effective amount of a thermal stabilizing agent selected from the group consisting of ascorbic acid, citric acid, disodium citrate, |
| 5319033 |
Tapered block monovinyl aromatic/conjugated diene copolymer |
June 7, 1994 |
| A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the second monomer alter |
| 5270396 |
Sequential coupling in formation of resinous block copolymers |
December 14, 1993 |
| A method for preparing resinous copolymers by sequential charge copolymerization of at least two charges, at least one being a conjugated diene and at least one being a monovinylarene; followed by a charge of a polyfunctional coupling agent; and the final charge being an essentially |
| 5256736 |
Tapered block copolymers of conjugated dienes and monovinylarenes |
October 26, 1993 |
| A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and a mixture of monovinylaromatic and conjugated diene monomers; (3) an initiator and a |
| 5227419 |
Tapered block styrene/butadiene copolymers |
July 13, 1993 |
| A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the first monomer to pro |
| 5130377 |
Tapered block styrene/butadiene copolymers |
July 14, 1992 |
| A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the second monomer alter |
| 4471099 |
Treatment of a hydrogenated polymer solution after hydrogenation catalyst removal to improve sub |
September 11, 1984 |
| In the preparation of nitrogen-containing dispersant viscosity index improvers and/or gasoline detergent additives wherein a polymer cement is hydrogenated, an alkaline wash step following hydrogenation catalyst removal reduces residual poisons such that subsequent lithiation is impr |
| 4418234 |
Viscosity index improver soluble in synthetic poly(.alpha.-olefin) lubricants |
November 29, 1983 |
| Hydrogenated completely random conjugated diene/monovinylarene copolymers with a conjugated diene content above about 50 weight percent, monovinylarene content below about 50 weight percent, vinyl unsaturation (normalized) at least about 25 weight percent, block polymonovinylarene be |
| 4412087 |
Viscosity index improver with high thickening power |
October 25, 1983 |
| Hydrogenated random block conjugated diene/monovinylarene copolymers with a terminal monovinylarene block having a diene content in the range of 44 to 70 weight percent, normalized vinyl in the range 30.2-51.3 percent, percent vinyl based on copolymer plus percent styrene in the range |
| 4402844 |
Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogena |
September 6, 1983 |
| Nitrogen-containing copolymers useful as viscosity index improvers with dispersing characteristics are prepared by the reaction of lithiated hydrogenated conjugated diene-monovinylarene copolymers with substituted aminolactams. |
| 4402843 |
Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogena |
September 6, 1983 |
| Nitrogen-containing copolymers useful as viscosity index improvers with dispersing characteristics are prepared by the reaction of lithiated hydrogenated conjugated diene-monovinylarene copolymers with substituted aminopyridine. |
| 4297464 |
Orthoesters as coupling agents for producing monovinylarene homopolymers |
October 27, 1981 |
| Orthoesters are used to couple living homopolymers of monovinylarenes. |
| 4238576 |
Orthoesters as coupling agents for producing novel polymers |
December 9, 1980 |
| Orthoesters are used to couple living homopolymers of monovinylarenes, and living copolymers of monovinylarenes and conjugated dienes. Novel coupled polymers are thereby produced. |
| 4238202 |
Hydrocarbon fuels with carburetor detergent properties |
December 9, 1980 |
| Carburetor detergency properties of hydrocarbon fuels are provided by nitrogen-containing organic compound-grafted, hydrogenated conjugated diene-monovinylarene copolymers. |
| 4158098 |
Organo lithium initiator |
June 12, 1979 |
| Polyalkoxy monovinyl substituted aromatic compounds, such as 3,4-dimethoxystyrene, function as both comonomer and randomizing agent in organolithium initiated copolymerization of a conjugated diene with a monovinyl aromatic compound, such as of butadiene with styrene. The resultant p |
| 4145298 |
Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index imp |
March 20, 1979 |
| Nitrogen-containing copolymers are prepared by the reaction of lithiated hydrogenated conjugated diene-monovinylarene copolymers with nitrogen-containing organic compounds. The nitrogen-containing copolymers are oil additives which combine the aspects of viscosity index improvers wit |
| 4105714 |
Coupling of alkali metal-terminated polymers |
August 8, 1978 |
| Alkali metal-terminated polymers of one or more alkadienes and of one or more vinyl-substituted aromatic monomers are effectively coupled by trichloro-, tribromo- or triiodo-s-triazine. |
| 4086406 |
Coupling lithium-initiated polymer with a vinylhalomethylarene |
April 25, 1978 |
| Lithium-initiated polymers are coupled with a vinylhalomethylarene such as vinylbenzyl chloride. Maximum molecular weight is obtained at about one mol of coupling agent for two mols of polymerlithium, indicating a major amount of the coupling to be in the form of about two polymerlithium |
| 4076915 |
Treatment of coupled polymers prior to hydrogenation |
February 28, 1978 |
| Treating a silicon-coupled or germanium-coupled conjugated diene polymer with a hydrocarbonlithium, -sodium, -potassium, -calcium, -magnesium, -zinc or -aluminum compound after the coupling step and prior to hydrogenation. |
| 3948872 |
Polymerization process for producing low cis-configuration homopolymers |
April 6, 1976 |
| A polymerization process for preparing homopolymers of conjugated dienes having decreased cis-content resulting from the use of organolithium compounds as initiators wherein 1,2-dialkoxybenzene is introduced in a quantity sufficient to decrease the cis-content of the homopolymers for |
| 3931107 |
Polyalkoxy monovinylaromatic compound in copolymerization of a conjugated diene with a monovinyl |
January 6, 1976 |
| Polyalkoxy monovinyl substituted aromatic compounds, such as 3,4-dimethoxystyrene, function as both comonomer and randomizing agent in organolithium initiated copolymerization of a conjugated diene with a monovinyl aromatic compound, such as of butadiene with styrene. The resultant p |
