Patents by Inventor Shenghong A. Dai
Shenghong A. Dai 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: 5143945Abstract: Disclosed are rigid polyurethane-polyisocyanurate foams prepared from polyisocyanates, polyols, trimer catalysts and a blowing agent mixture comprising (i) a halocarbon, and (ii) an organic carboxylic acid, and, optionally water.The foams have excellent aged K-factor values at fluorocarbon levels reduced by up to 75 percent over prior art materials.Type: GrantFiled: November 13, 1990Date of Patent: September 1, 1992Assignee: The Dow Chemical CompanyInventors: Thomas W. Bodnar, Leslie A. Cole, Shenghong A. Dai
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Patent number: 4720584Abstract: Nitro-isopropenyldiphenyl ethers are provided which can serve as a useful source of known monomer intermediates or as intermediates for the preparation of nitro-haloisopropyl substituted diphenyl ethers. The latter have been discovered to act as facile alkylating agents with phenols providing nitro-p-hydroxyphenylisopropyl substituted diphenyl ethers. When the latter compounds are reduced there are obtained the corresponding amino-p-hydroxyphenylisopropyl substituted diphenyl ethers.The polymerization of this last class of compounds with acid halides provides polyamide-esters. The polymers can be used in the manufacture of such articles as tubing, hose, bellows hose, and the like.Type: GrantFiled: June 30, 1986Date of Patent: January 19, 1988Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4709004Abstract: Nitro-isopropenyldiphenyl ethers are provided which can serve as a useful source of known monomer intermediates or as intermediates for the preparation of nitro-haloisopropyl substituted diphenyl ethers. The latter have been discovered to act as facile alkylating agents with phenols providing nitro-p-hydroxyphenylisopropyl substituted diphenyl ethers. When the latter compounds are reduced there are obtained the corresponding amino-p-hydroxyphenylisopropyl substituted diphenyl ethers.The polymerization of this last class of compounds with acid halides provides polyamide-esters. The polymers can be used in the manufacture of such articles as tubing, hose, bellows hose, and the like.Type: GrantFiled: June 30, 1986Date of Patent: November 24, 1987Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4689434Abstract: Nitro-isopropenyldiphenyl ethers are provided which can serve as a useful source of known monomer intermediates or as intermediates for the preparation of nitro-haloisopropyl substituted diphenyl ethers. The latter have been discovered to act as facile alkylating agents with phenols providing nitro-p-hydroxyphenylisopropyl substituted diphenyl ethers. When the latter compounds are reduced there are obtained the corresponding amino-p-hydroxyphenylisopropyl substituted diphenyl ethers.The polymerization of this last class of compounds with acid halides provides polyamide-esters. The polymers can be used in the manufacture of such articles as tubing, hose, bellows hose, and the like.Type: GrantFiled: June 30, 1986Date of Patent: August 25, 1987Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4683302Abstract: Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.Type: GrantFiled: December 20, 1985Date of Patent: July 28, 1987Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Philip W. Sherwood
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Patent number: 4642342Abstract: Novel isocyanato-azetidinedione compounds are provided which have the formula ##STR1## wherein R and R.sub.1 can be independently selected from hydrogen and hydrocarbyl or can be joined together and along with the carbon to which they are attached represent a cycloalkane residue having 4 to 6 ring carbon atoms, y is an integer from 1 to 7 and X is a hydrocarbon radical having a valency of y plus one.The monoisocyanate compounds are used as intermediates to provide further novel azetidinedione containing derivatives in the form of azetidinedione-isocyanurates (II) and azetidinedione-urethanes (III).All three classes of compounds can be employed as acid scavenging agents for stabilizing various kinds of halogenated polymer systems. Notably, (I) and (III) form highly useful polyamide-polyureas and polyamide-polyurethanes respectively by reaction with organic polyamines.Type: GrantFiled: December 20, 1985Date of Patent: February 10, 1987Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4618727Abstract: Nitro-isopropenyldiphenyl ethers are provided which can serve as a useful source of known monomer intermediates or as intermediates for the preparation of nitro-haloisopropyl substituted diphenyl ethers. The latter have been discovered to act as facile alkylating agents with phenols providing nitro-p-hydroxyphenylisopropyl substituted diphenyl ethers. When the latter compounds are reduced there are obtained the corresponding amino-p-hydroxyphenylisopropyl substituted diphenyl ethers.The polymerization of this last class of compounds with acid halides provides polyamide-esters. The polymers can be used in the manufacture of such articles as tubing, hose, bellows hose, and the like.Type: GrantFiled: November 5, 1984Date of Patent: October 21, 1986Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4612374Abstract: Novel isocyanato-azetidinedione compounds are provided which have the formula ##STR1## wherein R and R.sub.1 can independently selected from hydrogen and hydrocarbyl or can be joined together and along with the carbon to which they are attached represent a cycloalkane residue having 4 to 6 ring carbon atoms, y is an integer from 1 to 7 and X is a hydrocarbon radical having a valency of y plus one.The monoisocyanate compounds are used as intermediates to provide further novel azetidinedione containing derivatives in the form of azetidinedione-isocyanurates (II) and azetidinedione-urethanes (III).All three classes of compounds can be employed as acid scavenging agents for stablizing various kinds of halogenated polymer systems. Notably, (I) and (III) form highly useful polyamide-polyureas and polyamide-polyurethanes respectively by reaction with organic polyamines.Type: GrantFiled: December 20, 1985Date of Patent: September 16, 1986Assignee: The Dow Chemical CompanyInventor: Shenghong A. Dai
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Patent number: 4612098Abstract: Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.Type: GrantFiled: December 20, 1985Date of Patent: September 16, 1986Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Philip W. Sherwood
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Patent number: 4604450Abstract: Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polyamine joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain bis azetidine-2,4-dione rings.The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings.The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.Type: GrantFiled: August 16, 1985Date of Patent: August 5, 1986Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Steven J. Grossman, Kemal Onder
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Patent number: 4576747Abstract: Novel isocyanato-azetidinedione compounds are provided which have the formula ##STR1## wherein R and R.sub.1 can be independently selected from hydrogen and hydrocarbyl or can be joined together and along with the carbon to which they are attached represent a cycloalkane residue having 4 to 6 ring carbon atoms, y is an integer from 1 to 7 and X is a hydrocarbon radical having a valency of y plus one.The monoisocyanate compounds are used as intermediates to provide further novel azetidinedione containing derivatives in the form of azetidinedione-isocyanurates (II) and azetidinedione-urethanes (III).All three classes of compounds can be employed as acid scavenging agents for stabilizing various kinds of halogenated polymer systems. Notably, (I) and (III) form highly useful polyamide-polyureas and polyamide-polyurethanes respectively by reaction with organic polyamines.Type: GrantFiled: May 7, 1984Date of Patent: March 18, 1986Assignee: The Upjohn CompanyInventor: Shenghong A. Dai
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Patent number: 4576980Abstract: Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.Type: GrantFiled: October 15, 1984Date of Patent: March 18, 1986Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Philip W. Sherwood
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Patent number: 4550157Abstract: Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polyamine joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain bis azetidine-2,4-dione rings.The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings.The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.Type: GrantFiled: May 7, 1984Date of Patent: October 29, 1985Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Steven J. Grossman, Kemal Onder
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Patent number: 4334106Abstract: An improved process is provided for the preparation of a certain class of hydroxyphenyl-indanol compounds by the cyclization of a phenol selected from the group consisting of an isopropenylphenol, oligomers thereof, and mixtures of any of said group in any combination and proportion, by dissolving said phenol in a stoichiometric excess of an organic acid selected from the group consisting of trifluoroacetic acid, trichloroacetic acid, difluoroacetic acid, dichloroacetic acid, fluoroacetic acid, chloroacetic acid, formic acid, and mixtures thereof at a temperature falling within a range of from about 0.degree. C. to about 90.degree. C. to form a solution; and maintaining said solution at a temperature falling within the above said range until the formation of said indanol is substantially complete.The dihydroxy compounds produced by the present method are useful in the preparation of epoxy, alkyd, and urethane resins in particular.Type: GrantFiled: February 5, 1981Date of Patent: June 8, 1982Assignee: The Upjohn CompanyInventor: Shenghong A. Dai
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Patent number: 4328361Abstract: A process is disclosed for converting p-isopropenylphenol and derivatives thereof and, more particularly, oligomers of p-isopropenylphenol and derivatives thereof, to hydroquinone via monomeric intermediates [e.g. p-(2-haloisopropyl)phenol in the case of p-isopropenylphenol and oligomers thereof]. The process involves reacting the starting materials with a hydrogen halide (e.g. gaseous hydrogen chloride) in the presence of an organic solvent and subjecting the product so obtained to oxidation with hydrogen peroxide or an organic hydroperoxide.Type: GrantFiled: January 16, 1981Date of Patent: May 4, 1982Assignee: The Upjohn CompanyInventor: Shenghong A. Dai