Patents by Inventor Donald L. Christman
Donald L. Christman 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: 5478494Abstract: A polyol composition is provided which when reacted with an organic isocyanate, has good flow characteristics and makes a rigid polyurethane foam having good dimensional stability at low densities. The polyol compostion has a polyol component which must have present a polyoxyalkylene polyether polyol having an equivalent weight of 130 or less and a hydroxyl number of 400 or more, a polyoxyalkylene polyether polyol having an average functionality from 1.5 to 3.1 and a viscosity of less than 800 cP at 25.degree. C., and a polyoxyalkylene polyether polyol having an average functionality of greater than 3.1 and a viscosity of 5,000 cp or less at 25.degree. C. The polyol composition also has formic acid or a mixture of formic acid and water as blowing agents, and further contains a delayed action blow catalyst and a delayed action gel catalyst.Type: GrantFiled: September 22, 1993Date of Patent: December 26, 1995Assignee: BASF CorporationInventors: Thomas B. Lee, Thomas L. Fishback, Curtis J. Reichel, Donald L. Christman
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Patent number: 5453455Abstract: The present invention relates to using lithium salts of an organic material having 2 to 30 carbon atoms and at least one carboxylic acid in a rigid polyurethane formulation to produce foams having energy absorbing properties.Type: GrantFiled: May 3, 1993Date of Patent: September 26, 1995Assignee: BASF CorporationInventors: David C. Krueger, Donald L. Christman, Andreas H. Rothacker, Thomas B. Lee
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Patent number: 5324754Abstract: The invention pertains to polyol compositions containing a lithium salt of an aliphatic or cycloaliphatic, saturated or unsaturated carboxylic acid having 2 to 7 carbon atoms and to flexible polyurethane foams having an open cell structure produced thereby.Type: GrantFiled: December 14, 1992Date of Patent: June 28, 1994Assignee: BASF CorporationInventors: Valeri L. Valoppi, Donald L. Christman
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Patent number: 5286758Abstract: It has been found that in addition to acting as an auxiliary blowing agent, various salts of formic acid may be used to tailor the reactivity characteristics of rigid, polyurethane foam formulation. Salts of particular interest are: ammonium formate, sodium formate, and potassium formate. By varying amounts and combinations of the above salts, characteristics of a formulation's reactivity such as cream time, gel time, rise time, and tack-free time may be manipulated.Type: GrantFiled: January 4, 1993Date of Patent: February 15, 1994Assignee: BASF CorporationInventors: Donald L. Christman, Curtis J. Reichel
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Patent number: 5258416Abstract: The present invention relates to using lithium salts of an organic material having 2 to 30 carbon atoms and at least one carboxylic acid in a rigid polyurethane formulation to produce foams having energy absorbing properties.Type: GrantFiled: January 25, 1993Date of Patent: November 2, 1993Assignee: BASF CorporationInventors: David C. Krueger, Donald L. Christman, Andreas H. Rothacker, Thomas B. Lee
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Patent number: 5248703Abstract: The present invention relates to using lithium salts of an organic material having 2 to 30 carbon atoms and at least one carboxylic acid in a rigid polyurethane formulation to produce foams having energy absorbing properties.Type: GrantFiled: March 13, 1992Date of Patent: September 28, 1993Assignee: BASF CorporationInventors: David C. Krueger, Donald L. Christman, Andreas H. Rothacker, Thomas B. Lee
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Patent number: 5179131Abstract: Addition of minor quantities of mono- or dicarboxylic acids to polyurethane foam formulations which employ polyisocyanate polyaddition polymer polyol dispersions prevents shrinkage and tightness in polyurethane foams prepared therefrom. If acid addition is made directly after dispersion preparation, reduction of polyol viscosity and more rapid stabilization against viscosity change is observed.Type: GrantFiled: December 27, 1991Date of Patent: January 12, 1993Assignee: BASF CorporationInventors: Steven E. Wujcik, Donald L. Christman, Oscar M. Grace
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Patent number: 4664563Abstract: Rigid polyurethane foams which exhibit constant or slightly decreasing strain with an increasing stress in compression are prepared employing from 30 to 60 parts of an oxyalkylated toluenediamine polyol per 100 parts of polyol mixture. These foams may be employed in shoring up geological formations.Type: GrantFiled: June 17, 1986Date of Patent: May 12, 1987Assignee: BASF CorporationInventor: Donald L. Christman
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Patent number: 4614754Abstract: Rigid polyurethane foams which exhibit constant or slightly decreasing strain with an increasing stress in compression are prepared employing from 30 to 60 parts of an alkoxylated toluenediamine polyol per 100 parts of polyol mixture. These foams may be employed in shoring up geological formations.Type: GrantFiled: September 21, 1984Date of Patent: September 30, 1986Assignee: BASF CorporationInventor: Donald L. Christman
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Patent number: 4605725Abstract: The invention relates to polyurethane sealant compositions prepared by reacting a polyether polyol other than one derived from monoethanolamine, an alkylene oxide adduct of monoethanolamine, optionally pigment, catalyst and inorganic filler, and an organic polyisocyanate. The compositions are useful as thermal break sealants and in the manufacture of bowling balls.Type: GrantFiled: November 14, 1984Date of Patent: August 12, 1986Assignee: BASF CorporationInventor: Donald L. Christman
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Patent number: 4588803Abstract: The invention relates to low shrinkage polyurethane sealant compositions which are prepared by reacting a mixture of a polyoxyalkylene polyether glycol, an ethylene oxide adduct of toluenediamine and triisopropanolamine with an organic polyisocyanate.Type: GrantFiled: November 14, 1984Date of Patent: May 13, 1986Assignee: BASF CorporationInventor: Donald L. Christman
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Patent number: 4585807Abstract: The invention relates to rigid polyurethane foams prepared by reacting a polyether polyol other than one derived from ethylenediamine, an alkylene oxide adduct of ethylenediamine, catalyst, surfactant, and blowing agent, and an organic polyisocyanate. The compositions are useful for producing insulation panels.Type: GrantFiled: January 14, 1985Date of Patent: April 29, 1986Assignee: BASF CorporationInventor: Donald L. Christman
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Patent number: 4555531Abstract: The invention relates to rigid polyurethane foams prepared by reacting a polyether polyol other than one derived from an alkanolamine, an alkylene oxide adduct of an alkanolamine, catalyst and blowing agent, and an organic polyisocyanate. The compositions are useful as insulation.Type: GrantFiled: January 14, 1985Date of Patent: November 26, 1985Assignee: BASF Wyandotte CorporationInventor: Donald L. Christman
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Patent number: 4438248Abstract: The subject matter of this invention relates to the preparation of polyurethanes. It is particularly concerned with the use of organo-mercury compounds and trimerization catalysts as co-catalysts in the preparation of noncellular polyurethane elastomers.Type: GrantFiled: December 20, 1982Date of Patent: March 20, 1984Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Bernard A. Merkl
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Patent number: 4332953Abstract: A carbamylbiuret-modified polyisocyanate of the formula: ##STR1## wherein n is an integer of from about 1 to about 20; R is a divalent radical containing from about 1 to about 18 carbon atoms; and Y is a divalent radical selected from the group consisting of: ##STR2## wherein D is selected from the group consisting of O, S, and NH; X, X', and X" are independently selected from the group consisting of oxygen and sulfur; R.sup.2 and R.sup.3 are independently selected from the group consisting of aryl of from about 6 to about 18 carbon atoms, alkyl containing from about 1 to about 6 carbon atoms, and cycloalkyl containing from about 3 to about 7 carbon atoms, provided that each of R.sup.2 and R.sup.3 differs from R; and R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are independently selected from the group consisting of hydrogen, alkyl containing from about 1 to about 6 carbon atoms, cycloalkyl containing from about 3 to about 7 carbon atoms, phenyl, and benzyl.Type: GrantFiled: December 29, 1980Date of Patent: June 1, 1982Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Peter T. Kan
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Patent number: 4331810Abstract: A carbamylbiuret-modified polyisocyanate of the formula: ##STR1## wherein n is an integer of from about 1 to about 20; R is a divalent radical containing from about 1 to about 18 carbon atoms; and Y is a divalent radical selected from the group consisting of: ##STR2## wherein D is selected from the group consisting of O, S, and NH; X, X', and X" are independently selected from the group consisting of oxygen and sulfur; R.sup.2 and R.sup.3 are independently selected from the group consisting of aryl of from about 6 to about 18 carbon atoms, alkyl containing from about 1 to about 6 carbon atoms, and cycloalkyl containing from about 3 to about 7 carbon atoms, provided that each of R.sup.2 and R.sup.3 differs from R; and R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are independently selected from the group consisting of hydrogen, alkyl containing from about 1 to about 6 carbon atoms, cycloalkyl containing from about 3 to about 7 carbon atoms, phenyl, and benzyl.Type: GrantFiled: December 29, 1980Date of Patent: May 25, 1982Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Peter T. Kan
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Patent number: 4331809Abstract: A carbamylbiuret-modified polyisocyanate of the formula: ##STR1## wherein n is an integer of from about 1 to about 20; R is a divalent radical containing from about 1 to about 18 carbon atoms; and Y is a divalent radical selected from the group consisting of: ##STR2## wherein D is selected from the group consisting of O, S, and NH; X, X', and X" are independently selected from the group consisting of oxygen and sulfur; R.sup.2 and R.sup.3 are independently selected from the group consisting of aryl of from about 6 to about 18 carbon atoms, alkyl containing from about 1 to about 6 carbon atoms, and cycloalkyl containing from about 3 to about 7 carbon atoms, provided that each of R.sup.2 and R.sup.3 differs from R; and R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are independently selected from the group consisting of hydrogen, alkyl containing from about 1 to about 6 carbon atoms, cycloalkyl containing from about 3 to about 7 carbon atoms, phenyl, and benzyl.Type: GrantFiled: December 22, 1980Date of Patent: May 25, 1982Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Peter T. Kan
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Patent number: 4330636Abstract: A carbamylbiuret-modified polyisocyanate of the formula: ##STR1## wherein n is an integer of from about 1 to about 20; R is a divalent radical containing from about 1 to about 18 carbon atoms; and Y is a divalent radical selected from the group consisting of: ##STR2## wherein D is selected from the group consisting of O, S, and NH; X, X', and X" are independently selected from the group consisting of oxygen and sulfur; R.sup.2 and R.sup.3 are independently selected from the group consisting of aryl of from about 6 to about 18 carbon atoms, alkyl containing from about 1 to about 6 carbon atoms, and cycloalkyl containing from about 3 to about 7 carbon atoms, provided that each of R.sup.2 and R.sup.3 differs from R; and R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are independently selected from the group consisting of hydrogen, alkyl containing from about 1 to about 6 carbon atoms, cycloalkyl containing from about 3 to about 7 carbon atoms, phenyl, and benzyl.Type: GrantFiled: December 29, 1980Date of Patent: May 18, 1982Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Peter T. Kan
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Patent number: 4271087Abstract: A carbamylbiuret-modified polyisocyanate of the formula: ##STR1## wherein n is an integer of from about 1 to about 20; R is a divalent radical containing from about 1 to about 18 carbon atoms; and Y is a divalent radical defined hereinbelow. The compounds of the invention are useful for preparing urethane-based microcellular foams and elastomers.Type: GrantFiled: November 8, 1979Date of Patent: June 2, 1981Assignee: BASF Wyandotte CorporationInventors: Donald L. Christman, Peter T. Kan