Inventor

TREPKA WILLIAM J

30 patents

Patents

30 patents

US6265485B1Jul 24, 2001

Tapered block copolymers of monovinylarenes and conjugated dienes

PHILLIPS PETROLEUM CO89 citations98

US5910546AJun 8, 1999

Tapered block copolymers of monivinylarenes and conjugated dienes

PHILLIPS PETROLEUM CO98 citations98

US5436298AJul 25, 1995

Block copolymers of monovinylarenes and conjugated dienes and preparation thereof

PHILLIPS PETROLEUM CO120 citations98

US5227419AJul 13, 1993

Tapered block styrene/butadiene copolymers

PHILLIPS PETROLEUM CO116 citations98

US5399628AMar 21, 1995

Block copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks

PHILLIPS PETROLEUM CO113 citations97

US6265484B1Jul 24, 2001

Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index improvers having dispersant properties

PHILLIPS PETROLEUM CO81 citations96

US5705569AJan 6, 1998

Block copolymers of monovinylarenes and conjugated dienes and preparation thereof

PHILLIPS PETROLEUM CO57 citations95

US5587425ADec 24, 1996

Blends of copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks

PHILLIPS PETROLEUM CO36 citations92

US5319033AJun 7, 1994

Tapered block monovinyl aromatic/conjugated diene copolymer

PHILLIPS PETROLEUM CO42 citations92

US4076915AFeb 28, 1978

Treatment of coupled polymers prior to hydrogenation

PHILLIPS PETROLEUM CO34 citations92

US4238202ADec 9, 1980

Hydrocarbon fuels with carburetor detergent properties

PHILLIPS PETROLEUM CO42 citations89

US5270396ADec 14, 1993

Sequential coupling in formation of resinous block copolymers

PHILLIPS PETROLEUM CO19 citations82

US4471099ASep 11, 1984

Treatment of a hydrogenated polymer solution after hydrogenation catalyst removal to improve subsequent lithiation reaction

PHILLIPS PETROLEUM CO20 citations82

US4402844ASep 6, 1983

Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogenated copolymers with substituted aminolactams

PHILLIPS PETROLEUM CO24 citations82

US4158098AJun 12, 1979

Organo lithium initiator

PHILLIPS PETROLEUM CO21 citations82

US3931107AJan 6, 1976

Polyalkoxy monovinylaromatic compound in copolymerization of a conjugated diene with a monovinyl-substituted aromatic compound

PHILLIPS PETROLEUM CO12 citations74

US4418234ANov 29, 1983

Viscosity index improver soluble in synthetic poly(α-olefin) lubricants

PHILLIPS PETROLEUM CO11 citations73

US5422389AJun 6, 1995

Method for stabilizing monovinylarene/conjugated diene copolymers and a method for preparing a stabilizing mixture

PHILLIPS PETROLEUM CO13 citations69

US4105714AAug 8, 1978

Coupling of alkali metal-terminated polymers

PHILLIPS PETROLEUM CO13 citations66

US5384349AJan 24, 1995

Conjugated diene/monovinylarene copolymers and preparation thereof

PHILLIPS PETROLEUM CO6 citations63

US4402843ASep 6, 1983

Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogenated copolymers with 4-substituted aminopyridines

PHILLIPS PETROLEUM CO5 citations63

US4297464AOct 27, 1981

Orthoesters as coupling agents for producing monovinylarene homopolymers

PHILLIPS PETROLEUM CO3 citations63

US4238576ADec 9, 1980

Orthoesters as coupling agents for producing novel polymers

PHILLIPS PETROLEUM CO5 citations63

US4086406AApr 25, 1978

Coupling lithium-initiated polymer with a vinylhalomethylarene

PHILLIPS PETROLEUM CO3 citations63

US3948872AApr 6, 1976

Polymerization process for producing low cis-configuration homopolymers

PHILLIPS PETROLEUM CO4 citations62

TREPKA WILLIAM J

Patents

Tapered block copolymers of monovinylarenes and conjugated dienes

Tapered block copolymers of monivinylarenes and conjugated dienes

Block copolymers of monovinylarenes and conjugated dienes and preparation thereof

Tapered block styrene/butadiene copolymers

Block copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks

Tapered block copolymers of monovinylarenes and conjugated dienes

Tapered block copolymers of monovinylarenes and conjugated dienes

Tapered block copolymers of conjugated dienes and monovinylarenes

Tapered block styrene/butadiene copolymers

Viscosity index improver with high thickening power

Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index improvers having dispersant properties

Block copolymers of monovinylarenes and conjugated dienes and preparation thereof

Blends of copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks

Tapered block monovinyl aromatic/conjugated diene copolymer

Treatment of coupled polymers prior to hydrogenation

Hydrocarbon fuels with carburetor detergent properties

Sequential coupling in formation of resinous block copolymers

Treatment of a hydrogenated polymer solution after hydrogenation catalyst removal to improve subsequent lithiation reaction

Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogenated copolymers with substituted aminolactams

Organo lithium initiator

Polyalkoxy monovinylaromatic compound in copolymerization of a conjugated diene with a monovinyl-substituted aromatic compound

Viscosity index improver soluble in synthetic poly(α-olefin) lubricants

Method for stabilizing monovinylarene/conjugated diene copolymers and a method for preparing a stabilizing mixture

Coupling of alkali metal-terminated polymers

Conjugated diene/monovinylarene copolymers and preparation thereof

Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogenated copolymers with 4-substituted aminopyridines

Orthoesters as coupling agents for producing monovinylarene homopolymers

Orthoesters as coupling agents for producing novel polymers

Coupling lithium-initiated polymer with a vinylhalomethylarene

Polymerization process for producing low cis-configuration homopolymers