Patents by Inventor Nathan E. Stacy
Nathan E. Stacy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9550869Abstract: We disclose a monovinylarene-conjugated diene block copolymer containing a plurality of monovinylarene-conjugated diene mixed blocks, wherein each mixed block contains conjugated diene units and monovinylarene units in a weight ratio of about 0.05 to about 0.33. We also disclose a composition containing (a) from about 50 parts by weight to about 95 parts by weight of the monovinylarene-conjugated diene block copolymer and (b) from about 5 parts by weight to about 50 parts by weight of polystyrene; wherein the monovinylarene-conjugated diene block copolymer and the polystyrene total 100 parts by weight.Type: GrantFiled: April 15, 2015Date of Patent: January 24, 2017Assignee: Chevron Phillips Chemical Company LPInventors: John Mark Brown, Nathan E. Stacy, Carleton E. Stouffer, John D. Wilkey, Michael A. Smith
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Publication number: 20150218325Abstract: We disclose a monovinylarene-conjugated diene block copolymer containing a plurality of monovinylarene-conjugated diene mixed blocks, wherein each mixed block contains conjugated diene units and monovinylarene units in a weight ratio of about 0.05 to about 0.33. We also disclose a composition containing (a) from about 50 parts by weight to about 95 parts by weight of the monovinylarene-conjugated diene block copolymer and (b) from about 5 parts by weight to about 50 parts by weight of polystyrene; wherein the monovinylarene-conjugated diene block copolymer and the polystyrene total 100 parts by weight.Type: ApplicationFiled: April 15, 2015Publication date: August 6, 2015Inventors: John Mark Brown, Nathan E. Stacy, Carleton E. Stouffer, John D. Wilkey, Michael A. Smith
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Patent number: 9040628Abstract: We disclose a monovinylarene-conjugated diene block copolymer containing a plurality of monovinylarene-conjugated diene mixed blocks, wherein each mixed block contains conjugated diene units and monovinylarene units in a weight ratio of about 0.05 to about 0.33. We also disclose a composition containing (a) from about 50 parts by weight to about 95 parts by weight of the monovinylarene-conjugated diene block copolymer and (b) from about 5 parts by weight to about 50 parts by weight of polystyrene; wherein the monovinylarene-conjugated diene block copolymer and the polystyrene total 100 parts by weight.Type: GrantFiled: November 20, 2012Date of Patent: May 26, 2015Assignee: Chevron Phillips Chemical Company LPInventors: John Mark Brown, Michael A. Smith, Nathan E. Stacy, Carleton E. Stouffer, John D. Wilkey
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Patent number: 8415429Abstract: We disclose a monovinylarene-conjugated diene block copolymer containing a plurality of monovinylarene-conjugated diene mixed blocks, wherein each mixed block contains conjugated diene units and monovinylarene units in a weight ratio of about 0.05 to about 0.33. We also disclose a composition containing (a) from about 50 parts by weight to about 95 parts by weight of the monovinylarene-conjugated diene block copolymer and (b) from about 5 parts by weight to about 50 parts by weight of polystyrene; wherein the monovinylarene-conjugated diene block copolymer and the polystyrene total 100 parts by weight.Type: GrantFiled: December 11, 2006Date of Patent: April 9, 2013Assignee: Chervron Phillips Chemical Company LPInventors: John Mark Brown, Michael A. Smith, Nathan E. Stacy, Carleton E. Stouffer, John D. Wilkey
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Publication number: 20080134642Abstract: We disclose a monovinylarene-conjugated diene block copolymer containing a plurality of monovinylarene-conjugated diene mixed blocks, wherein each mixed block contains conjugated diene units and monovinylarene units in a weight ratio of about 0.05 to about 0.33. We also disclose a composition containing (a) from about 50 parts by weight to about 95 parts by weight of the monovinylarene-conjugated diene block copolymer and (b) from about 5 parts by weight to about 50 parts by weight of polystyrene; wherein the monovinylarene-conjugated diene block copolymer and the polystyrene total 100 parts by weight.Type: ApplicationFiled: December 11, 2006Publication date: June 12, 2008Inventors: John Mark Brown, Michael A. Smith, Nathan E. Stacy, Carleton E. Stouffer, John D. Wilkey
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Patent number: 7037980Abstract: We disclose a monovinylarene/conjugated diene block copolymer, comprising: (i) a random (conjugated dienex/monovinylareney)m block, wherein x is about 2.5 wt % to about 10 wt %, y is from about 90 wt % to about 97.5 wt %, and x+y is about 97.5 wt % to 100 wt %; and (ii) a (conjugated diene)n block; wherein n is from about 20 wt % to about 30 wt %, m is from about 70 wt % to about 80 wt %, and m+n is from about 90 wt % to 100 wt %. We also disclose a method of forming the block copolymer and a method for fabricating an article from the block copolymer. The block copolymer typically exhibits a Tg at least about 10° C. less than the Tg of a reference polymer differing only in that x is about 0 wt % and y is about 100 wt %.Type: GrantFiled: November 10, 2003Date of Patent: May 2, 2006Assignee: Chevron Phillips Chemical Company, LPInventors: Nathan E. Stacy, Larry L. Nash, John D. Hottovy
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Patent number: 6835778Abstract: This invention relates to polymer blends, which comprise at least one tapered conjugated diene-monovinylarene block copolymer and at least one styrenic polymer. The polymer blends possess good optical and mechanical properties.Type: GrantFiled: May 20, 2002Date of Patent: December 28, 2004Assignee: Chevron Phillips Chemical Company LPInventors: Gregory M. Swisher, Vergil H Rhodes, Jr., Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Publication number: 20040115381Abstract: Embodiments include articles without plasticizers, having improved clarity, kink resistance, flexibility, melt fracture and die lines. Manufacturing may be conducted with materials comprising polymodal tapered polymers prepared from copolymerizing at least one monovinyl aromatic monomer and at least one conjugated diene monomer followed by coupling with at least one coupling agent.Type: ApplicationFiled: December 12, 2002Publication date: June 17, 2004Applicant: Chevron Phillips Chemical Company, LPInventors: Justin L. Harris, Shawn R. Kennedy, Jianxin J. Kuang, Mark Hanes, William W. Potter, Nathan E. Stacy, Lee A. Carvell, Timothy E. Rigdon, Larry L. Nash
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Patent number: 6730637Abstract: This invention relates to a low toxicity drilling mud oil. In some embodiments, the fluid loss characteristic of the drilling mud oil as used in a borehole can be reduced to less than 0.2 ml/30 minutes by adding about 0.05% to about 2.0% by weight of a butadiene-styrene-butadiene (BSB) block copolymer having about 20% by weight or more styrene.Type: GrantFiled: December 6, 2002Date of Patent: May 4, 2004Assignee: Chevron Phillips Chemical Company, LPInventors: Wayne S. Stewart, Nathan E. Stacy, Kelly B. Fox, Bharat B. Patel, Sam B. Ledbetter, Alvin Evans
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Publication number: 20040059057Abstract: This invention relates to polymer blends, which comprise at least one tapered conjugated diene-monovinylarene block copolymer and at least one styrenic polymer. The polymer blends possess good optical and mechanical properties.Type: ApplicationFiled: August 6, 2003Publication date: March 25, 2004Applicant: Chevron Phillips Chemical Company LPInventors: Gregory M. Swisher, Vergil H. Rhodes, Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Publication number: 20030004267Abstract: This invention relates to polymer blends, which comprise at least one tapered conjugated diene-monovinylarene block copolymer and at least one styrenic polymer. The polymer blends possess good optical and mechanical properties.Type: ApplicationFiled: May 20, 2002Publication date: January 2, 2003Inventors: Gregory M. Swisher, Vergil H. Rhodes, Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Patent number: 6444755Abstract: A block copolymer comprising at least three consecutive conjugated diene/monovinylarene tapered blocks is provided. Other aspects of this invention include a polymerization process for preparing the block copolymer and polymer blends comprising the block copolymer. The block copolymer and polymer blends exhibit excellent optical and mechanical properties.Type: GrantFiled: May 22, 2000Date of Patent: September 3, 2002Assignee: Phillips Petroleum CompanyInventors: Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Patent number: 6420486Abstract: A block copolymer comprising at least three consecutive conjugated diene/monovinylarene tapered blocks is provided. Other aspects of this invention include a polymerization process for preparing the block copolymer and polymer blends comprising the block copolymer. The block copolymer and polymer blends exhibit excellent optical and mechanical properties.Type: GrantFiled: May 22, 2000Date of Patent: July 16, 2002Assignee: Phillips Petroleum CompanyInventors: Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Patent number: 6265485Abstract: 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 monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer.Type: GrantFiled: November 12, 1997Date of Patent: July 24, 2001Assignee: Phillips Petroleum CompanyInventors: William J. Trepka, George A. Moczygemba, Nathan E. Stacy, Ralph C. Farrar, Jr.
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Patent number: 6265484Abstract: 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 monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer.Type: GrantFiled: November 7, 1997Date of Patent: July 24, 2001Assignee: Phillips Petroleum CompanyInventors: William J. Trepka, George A. Moczygemba, Nathan E. Stacy, Ralph C. Farrar, Jr.
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Patent number: 6096828Abstract: A block copolymer comprising at least three consecutive conjugated diene/monovinylarene tapered blocks is provided. Other aspects of this invention include a polymerization process for preparing the block copolymer and polymer blends comprising the block copolymer. The block copolymer and polymer blends exhibit excellent optical and mechanical properties.Type: GrantFiled: August 29, 1995Date of Patent: August 1, 2000Assignee: Phillips Petroleum CompanyInventors: Craig D. DePorter, Nathan E. Stacy, George A. Moczygemba
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Patent number: 5910546Abstract: 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 monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer.Type: GrantFiled: November 4, 1997Date of Patent: June 8, 1999Assignee: Phillips Petroleum CompanyInventors: William J. Trepka, George A. Moczygemba, Nathan E. Stacy, Ralph C. Farrar, Jr.
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Patent number: 5705569Abstract: 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 monomer;(c) a sequence of at least two charges selected from the group consisting of (i) initiator and a monovtnylarene monomer, (ii) a mixture of monovtnylarene monomer and conjugated diene monomor, (iii) a conjugated diene monomer, (iv) a monovinylarene monomer;(d) a coupling agent;wherein the sequence of at least two charges in step (c) can be made in any order. In a preferred embodiment, at least three Initiator charges are provided. In another preferred embodiment, at least three monovinylarene charges precede the first charge containing conjugated diene. In another preferred embodiment, at least four monovinylarene charges precede the first charge containing conjugated diene.Type: GrantFiled: May 22, 1996Date of Patent: January 6, 1998Assignee: Phillips Petroleum CompanyInventors: George A. Moczygemba, Larry L. Nash, William J. Trepka, Craig D. DePorter, Nathan E. Stacy, Ralph C. Farrar, Charles M. Selman
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Blends of copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks
Patent number: 5587425Abstract: 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 monomers; (4) a mixture of monovinylaromatic and conjuated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.Type: GrantFiled: December 28, 1995Date of Patent: December 24, 1996Assignee: Phillips Petroleum CompanyInventors: George A. Moczygemba, Nancy R. Knight, William J. Trepka, Nathan E. Stacy -
Patent number: 5545690Abstract: 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 monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the Invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer.Type: GrantFiled: June 7, 1995Date of Patent: August 13, 1996Assignee: Phillips Petroleum CompanyInventors: William J. Trepka, George A. Moczygemba, Nathan E. Stacy, Ralph C. Farrar, Jr.