Patents by Inventor Gaddam N. Babu
Gaddam N. Babu 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: 6245922Abstract: A photoactive compound that is the reaction product of an alkenyl azlactone compound and a nucleophilic aromatic ketone is described. Mer units derived from this compound can be used, for example, to crosslink via a hydrogen abstracting mechanism acrylic polymers in which they are incorporated.Type: GrantFiled: November 19, 1996Date of Patent: June 12, 2001Assignee: 3M Innovative Properties CompanyInventors: Steven M. Heilmann, Gaddam N. Babu, Larry R. Krepski, Howell K. Smith, II, Daniel E. Mickus
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Patent number: 5968652Abstract: The present invention encompasses novel coated particles that are well suited for use as absorption media in chromatographic processes. The coated particles comprise a substrate, such as aluminum, silicon, titanium or zirconium oxide particles, containing polymerized silane moieties on a surface of the substrate. The silane moieties include two or three olefinic groups as well as at least on useful ligand. Methods of preparing these coated particles are also described.Type: GrantFiled: November 10, 1998Date of Patent: October 19, 1999Assignee: 3M Innovative Properties CompanyInventors: Douglas A. Hanggi, Gaddam N. Babu, Terry L. Davis
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Patent number: 5908700Abstract: A moisture-curable, hot melt composition comprising a graft polyurethane prepolymer made by reacting a macromonomer, polyol, polyisocyanate and optional silane reagent is provided. The composition advantageously provides adhesives having initial creep resistance, short set times, and long open times.Type: GrantFiled: June 9, 1997Date of Patent: June 1, 1999Assignee: Minnesota Mining & Manufacturing CompanyInventors: Yoshinori Shimizu, Gaddam N. Babu, Albert I. Everaerts
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Patent number: 5902836Abstract: Solute polymers in solvent monomers form a coatable syrup that can be cured to a viscoelastomeric material when radiation-sensitive .alpha.-cleaving groups in either the polymer or one of the monomers are exposed to ultraviolet radiation. The solute polymers can be formed from the solvent monomers in situ or be added thereto to form the syrup.Type: GrantFiled: August 23, 1995Date of Patent: May 11, 1999Assignee: Minnesota Mining and Manufacturing CompanyInventors: Greggory S. Bennett, Gaddam N. Babu, Kejian Chen, Louis E. Winslow, George F. Vesley, Patrick G. Zimmerman
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Patent number: 5853642Abstract: A process that involves the in-line polymerization of olefinic monomer(s) and catalyst systems comprising a transition metal species that mediates the polymerization of the monomer(s) is disclosed. This process provides the immediate use of the resultant polymer without extensive further processing.Type: GrantFiled: July 29, 1994Date of Patent: December 29, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Allen R. Siedle, Gaddam N. Babu, Katherine A. Brown-Wensley, James R. Peterson
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Patent number: 5773485Abstract: Solute polymers in solvent monomers form a coatable syrup that can be cured to a viscoelastomeric material when radiation-sensitive hydrogen abstracting groups in either the polymer or one of the monomers are exposed to ultraviolet radiation. The solute polymers can be formed from the solvent monomers.Type: GrantFiled: August 23, 1995Date of Patent: June 30, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Greggory S. Bennett, Louis E. Winslow, Gaddam N. Babu
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Patent number: 5753364Abstract: The present invention provides pressure sensitive adhesives, compositions from which the pressure sensitive adhesives are formed, and articles having therein these pressure sensitive adhesives. The pressure sensitive adhesives, which have a Tg of less than about 20.degree. C., include a poly(.beta.-hydroxyorganoate) or mixture thereof. Preferably, these poly(.beta.-hydroxyorganoate)s include monomeric units of the general formula: ##STR1## wherein a minor amount (preferably no greater than about 20 mole percent) of the monomeric units have an R group containing 1-3 carbon atoms; and a major amount (preferably at least about 80 mole percent) of the monomeric units have an R group containing 4-30 (preferably 4-20) carbon atoms.Type: GrantFiled: January 30, 1997Date of Patent: May 19, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Denise R. Rutherford, W. James Hammar, Gaddam N. Babu
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Patent number: 5741543Abstract: This invention relates to a process in which a composition is coated onto a substrate and crosslinked so as to form a PSA by means of polymerizing free radically polymerizable monomers from covalently attached pendent unsaturation in the polymer component of the composition. The coating can carried out by a wide variety of industrial methods because the process of the invention allows for compositions with a wide degree of possible viscosities.Type: GrantFiled: July 18, 1996Date of Patent: April 21, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Louis E. Winslow, Greggory S. Bennett, Gaddam N. Babu, Paul Hattam, Michael L. Tumey, Bhaskar V. Velamakanni
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Patent number: 5667674Abstract: An adsorption medium that includes a finely divided substrate provided on at least a portion of its surface with the polymerization product of a silane that includes (a) two or three olefinic groups having the formula --(CH.sub.2).sub.m CH.dbd.CH.sub.2, where m is between 0 and 3, inclusive, and (b) at least one ligand selected to interact with a substance brought into contact with the adsorption medium to adsorb at least a portion of the substance on the surface of the adsorption medium.Type: GrantFiled: January 11, 1996Date of Patent: September 16, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Douglas A. Hanggi, Gaddam N. Babu, Terry L. Davis
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Patent number: 5614576Abstract: The present invention provides pressure sensitive adhesives, compositions from which the pressure sensitive adhesives are formed, and articles having therein these pressure sensitive adhesives. The pressure sensitive adhesives, which have a Tg of less than about 20.degree. C., include a poly(.beta.-hydroxyorganoate) or mixture thereof. Preferably, these poly(.beta.-hydroxyorganoate)s include monomeric units of the general formula: ##STR1## wherein: a minor amount (preferably no greater than about 20 mole percent) of the monomeric units have an R group containing 1-3 carbon atoms; and a major amount (preferably at least about 80 mole percent) of the monomeric units have an R group containing 4-30 (preferably 4-20) carbon atoms.Type: GrantFiled: April 15, 1996Date of Patent: March 25, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Denise R. Rutherford, W. James Hammar, Gaddam N. Babu
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Patent number: 5578380Abstract: Crosslinkable copolymers suitable for use as elevated temperature pressure-sensitive adhesives comprise randomly arranged silarylene units and siloxane units. Preferably, there is present in the copolymer backbone in the range of 0.8 to 1.2 siloxane to silarylene units, and there being present in the copolymer a crosslinking functionality.Type: GrantFiled: May 27, 1994Date of Patent: November 26, 1996Inventor: Gaddam N. Babu
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Patent number: 5559164Abstract: Compositions radiation-curable to pressure sensitive adhesives comprise (1) one or more copolymers of .alpha.-olefins of which 90.1 to 99 mole percent are one or more straight chain .alpha.-olefins, having 2 to 10 carbon atoms of which at least 55% have 6 to 10 carbon atoms, and 9.9 to 0.1 mole percent are one or more .alpha.-olefins having 6 to 20 carbon atoms and at least one methylidyne group; (2) an effective amount of a photoactive hydrogen abstracting agent; and, optionally, (3) a tackifying resin. The compositions, on exposure to radiation, provide adhesive films useful in adhesive applications, especially where a bonded article is to be used at elevated temperatures.Type: GrantFiled: December 2, 1994Date of Patent: September 24, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, James R. Peterson
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Patent number: 5506279Abstract: The invention provides novel acrylamide functional disubstituted acetyl aryl ketones and a process for their preparation in high yields uncontaminated by difunctional material. The invention further provides photocrosslinkable compositions comprising one or more ethylenically-unsaturated monomers and as photoinitiator the acrylamide functional disubstituted acetyl aryl ketone of the invention. The compositions are useful for the preparation of films and coatings, particularly pressure-sensitive adhesive coatings.Type: GrantFiled: May 3, 1994Date of Patent: April 9, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, Greggory S. Bennett, Kejian Chen, Steven M. Heilmann, Howell K. Smith, II, Louis E. Winslow
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Patent number: 5428209Abstract: A piece of microwave-active tape which is odor-free and physiologically inert can be adhered to a food package and remains strongly adhered during cooking at temperatures of at least 200.degree. C. The tape has layers of microwave-active material and a pressure-sensitive adhesive which is a polymeric .alpha.-olefin that has been cured to afford a "Peel Value" of at least 5 N/dm and a "Shrink Back" at 220.degree. C. of less than 5%. The tape can have a flexible backing such as a low-adhesion carrier web which can be stripped off from a piece of the tape that has been applied to a microwave food package, or when the backing is heat-resistant, it can be left in place.Type: GrantFiled: December 7, 1993Date of Patent: June 27, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, Susan S. Christopher, Pierre H. LePere, James R. Peterson
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Patent number: 5407970Abstract: The invention relates to adhesive compositions comprising terpolymers C.sub.6 to C.sub.10 unsaturated .alpha.-olefin monomers, C.sub.2 to C.sub.5 .alpha.-olefin monomers and polyene monomers and an effective amount of photoactive cross-linking agent to cross-link composition upon radiation from a source of active radiation.Type: GrantFiled: April 13, 1993Date of Patent: April 18, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: James R. Peterson, Gaddam N. Babu
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Patent number: 5401792Abstract: Sprayable hot-melt adhesive compositions are disclosed comprising (A) styrenic block copolymer, (B) tackifying resin, and (C) ethylene copolymer. Methods of preparing and using said compositions are also disclosed.Type: GrantFiled: November 10, 1993Date of Patent: March 28, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, Dennis D. Hansen
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Patent number: 5397648Abstract: A pressure-sensitive adhesive comprises a moisture-curable polymer comprising a polymer prepared by polymerization of at least one .alpha.-olefin monomer, said polymer containing hydrolyzable or condensable silyl groups and having a weight average molecular weight of at least 30,000. The pressure-sensitive adhesive can be hot-melt coated without emitting volatiles and then can adhere aggressively to both polar and nonpolar substrates. The PSA has good internal strength at high temperatures.Type: GrantFiled: December 21, 1993Date of Patent: March 14, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, James R. Peterson, Sehyun Nam
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Patent number: 5354619Abstract: The invention provides pressure-sensitive adhesive (PSA) compositions comprising a graft copolymer of one or more of ethylene and C.sub.3 -C.sub.18 .alpha.-olefins and one or more of a new class of macromonomers. The adhesive composition comprises a blend of the graft copolymer with a tackifying resin. Sheet materials can be coated with layers of the adhesive composition to provide tapes and laminates.Type: GrantFiled: December 21, 1993Date of Patent: October 11, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventor: Gaddam N. Babu
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Patent number: 5346980Abstract: Crosslinkable copolymers suitable for use as elevated temperature pressure-sensitive adhesives comprise randomly arranged silarylene units and siloxane units. Preferably, there is present in the copolymer backbone in the range of 0.8 to 1.2 siloxane to silarylene units, and there being present in the copolymer a crosslinking functionality.Type: GrantFiled: January 28, 1993Date of Patent: September 13, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventor: Gaddam N. Babu
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Patent number: 5298708Abstract: A piece of microwave-active tape which is odor-free and physiologically inert can be adhered to a food package and remains strongly adhered during cooking at temperatures of at least 200.degree. C. The tape has layers of microwave-active material and a pressure-sensitive adhesive which is a polymeric .alpha.-olefin that has been cured to afford a "Peel Value" of at least 5 N/dm and a "Shrink Back" at 220.degree. C. of less than 5%. The tape can have a flexible backing such as a low-adhesion carrier web which can be stripped off from a piece of the tape that has been applied to a microwave food package, or when the backing is heat-resistant, it can be left in place.Type: GrantFiled: February 7, 1991Date of Patent: March 29, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gaddam N. Babu, Susan S. Christopher, Pierre H. LePere, James R. Peterson