Patents by Inventor William E. Leistner
William E. Leistner 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).
-
Patent number: 5466819Abstract: Provided are ultraviolet stabilizers which are diphenylmethane compounds of the formula: ##STR1## wherein: R.sub.1 and R.sub.2 are independently C.sub.1 to C.sub.8 alkyl, cyclopentyl, cyclohexyl or cumyl; and X is selected from the group consisting of hydrogen, halogen, C.sub.1 to C.sub.12 alkyl and C.sub.1 to C.sub.12 alkoxy. The invention also pertains to a process for their preparation and stabilized polymer blends containing the stabilizers.Type: GrantFiled: July 6, 1994Date of Patent: November 14, 1995Assignee: Fairmount Chemical Company, Inc.Inventors: William E. Leistner, Semyon Moshchitsky
-
Patent number: 5373037Abstract: Provided are ultraviolet stabilizers which are diphenylmethane compounds of the formula: ##STR1## wherein: R.sub.1 and R.sub.2 are independently C.sub.1 to C.sub.8 alkyl, cyclopentyl, cyclohexyl or cumyl; and X is selected from the group consisting of hydrogen, halogen, C.sub.1 to C.sub.12 alkyl and C.sub.1 to C.sub.12 alkoxy. The invention also pertains to a process for their preparation and stabilized polymer blends containing the stabilizers.Type: GrantFiled: May 19, 1994Date of Patent: December 13, 1994Assignee: Fairmount Chemical Company, Inc.Inventors: William E. Leistner, Semyon Moshchitsky
-
Patent number: 5362881Abstract: Provided are ultraviolet stabilizers which are diphenylmethane compounds of the formula: ##STR1## wherein: R.sub.1 and R.sub.2 are independently C.sub.1 to C.sub.8 alkyl, cyclopentyl, cyclohexyl or cumyl; and X is selected from the group consisting of hydrogen, halogen, C.sub.1 to C.sub.12 alkyl and C.sub.1 to C.sub.12 alkoxy. The invention also pertains to a process for their preparation and stabilized polymer blends containing the stabilizers.Type: GrantFiled: May 27, 1993Date of Patent: November 8, 1994Assignee: Fairmount Chemical Company, Inc.Inventors: William E. Leistner, Semyon Moshchitsky
-
Patent number: 5360850Abstract: Provided are asymmetrical, ultraviolet stabilizers which are hydroxyphenyl benzotriazolylphenol compounds of the formula: ##STR1## wherein: R.sub.1 is C.sub.1 to C.sub.18 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.7 to C.sub.16 arylalkyl, C.sub.1 to C.sub.12 alkoxy, C.sub.6 to C.sub.10 aryloxy, C.sub.7 to C.sub.16 arylalkoxy, cyclopentyl, cyclohexyl or cumyl;R.sub.2 is C.sub.1 to C.sub.18 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.7 to C.sub.16 arylalkyl, C.sub.1 to C.sub.12 alkoxy, C.sub.6 to C.sub.10 aryloxy, C.sub.7 to C.sub.16 arylalkoxy, cyclopentyl, cyclohexyl or cumyl;R.sub.1 is different from R.sub.2 ; andX is selected from the group consisting of hydrogen, halogen, C.sub.1 to C.sub.12 alkyl, and C.sub.1 to C.sub.12 alkoxy. The invention also pertains to a process for their preparation and stabilized polymer blends containing the stabilizers.Type: GrantFiled: November 30, 1993Date of Patent: November 1, 1994Assignee: Fairmount Chemical Company, Inc.Inventors: Semyon Moshchitsky, William E. Leistner
-
Patent number: 5292890Abstract: Provided are asymmetrical, ultraviolet stabilizers which are hydroxyphenyl benzotriazolylphenol compounds of the formula: ##STR1## wherein: R.sub.1 is C.sub.1 to C.sub.18 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.7 to C.sub.16 arylalkyl, C.sub.1 to C.sub.12 alkoxy, C.sub.6 to C.sub.10 aryloxy, C.sub.7 to C.sub.16 arylalkoxy, cyclopentyl, cyclohexyl or cumyl;R.sub.2 is C.sub.1 to C.sub.18 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.7 to C.sub.16 arylalkyl, C.sub.1 to C.sub.12 alkoxy, C.sub.6 to C.sub.10 aryloxy, C.sub.7 to C.sub.16 arylalkoxy, cyclopentyl, cyclohexyl or cumyl;R.sub.1 is different from R.sub.2 ; andX is selected from the group consisting of hydrogen, halogen, C.sub.1 to C.sub.12 alkyl, and C.sub.1 to C.sub.12 alkoxy. The invention also pertains to a process for their preparation and stabilized polymer blends containing the stabilizers.Type: GrantFiled: May 5, 1993Date of Patent: March 8, 1994Assignee: Fairmount Chemical Company, Inc.Inventors: Semyon Moshchitsky, William E. Leistner
-
Patent number: 5262541Abstract: A process for producing 2-aryl-2H-benzotriazole by reducing an o-nitroazobenzene with a saccharide having an aldehyde group as a reducing agent in the presence of fluorenol as a catalyst and a base in solution. The reaction is conducted at a temperature of from about 60.degree. C. to about 80.degree. C. The reaction time and amount of catalyst is significantly reduced compared to the use of an aromatic ketone catalyst. The invention also provides a method for producing 2-aryl-2H-benzotriazole by reducing a 2-aryl-2H-benzotriazole-N-oxide intermediate with a saccharide having an aldehyde group as a reducing agent, in the presence of fluorenol under similar conditions.Type: GrantFiled: December 15, 1992Date of Patent: November 16, 1993Assignee: Fairmont Chemical Company, Inc.Inventors: Semyon Moshchitsky, William E. Leistner, Howard R. Leistner
-
Patent number: 5237071Abstract: A method for preparing 2,2'-methylene-bis-[6-(2H)-benzotriazol-2-yl)-4-hydrocarbyl phenols] is disclosed. According to the process(i) formaldehyde, a dialkylamine and a 4-hydrocarbyl-6-benzotriazolyl phenol as monomer are mixed;(ii) the mixture is heated to a temperature high enough to remove the water produced by the reaction of the mixture;(iii) thereafter an alkaline catalyst is added with heating for several hours;(iv) the phenol compound precipitates when the reaction mixture is neutralized and solvent for the salt product of the neutralization reaction is added in an amount sufficient to permit stirring.The solid product produced is 2,2'-methylene-bis-[6-(2H-benzotriazol-2-yl)-4-hydrocarbyl phenol] having the formula I: ##STR1## in which each R group is an alkyl group of one to twelve carbons or a cycloalkyl group of five to eight carbons and X is chloro or hydrogen.Type: GrantFiled: January 22, 1991Date of Patent: August 17, 1993Assignee: Fairmount Chemical Company, Inc.Inventors: William E. Leistner, Semyon Moshchitsky, Mahmut Levent
-
Patent number: 5166355Abstract: A method is described for preparing compounds of Formula I and Formula II: ##STR1## R.sub.1 is an alkyl group of one to twelve carbon atoms or a cycloalkyl group of five to eight carbons, X is chloro or hydrogen, and R.sub.2 is an alkoxy group having one to twelve carbons. In accordance with the method:(a) a bis(dialkylamino)methane is formed, preferably by reacting a dialkylamine of the formula HNR.sub.3 R.sub.4 (wherein R.sub.3 and R.sub.4 are independently alkyl groups having three or more carbons) and a solid formaldehyde material to produce the corresponding bis(dialkylamino)methane,(b) a monomer of Formula III or IV ##STR2## in which R.sub.1 is an alkyl group of one to twelve carbons or a cycloalkyl group of five to eight carbons, X is chloro or hydrogen and R.sub.Type: GrantFiled: February 4, 1991Date of Patent: November 24, 1992Assignee: Fairmount Chemical Co., Inc.Inventors: William E. Leistner, Semyon Moshchitsky, Mahmut Levent
-
Patent number: 4767834Abstract: Vinyl benzyl 2,2,6,6-tetramethyl piperidines are provided, having the formula: ##STR1## wherein: R is selected from the group consisting of hydrogen; oxyl; acyl and alkyl having from one to about eighteen carbon atoms; ##STR2## in which Y is --O-- or --N(R.sub.2)--, R.sub.1 is alkyl having from one to about eighteen carbon atoms and R.sub.2 is hydrogen or alkyl having from one to about eighteen carbon atoms.Type: GrantFiled: March 19, 1987Date of Patent: August 30, 1988Assignee: Adeka Argus Chemical Co., Ltd.Inventors: William E. Leistner, Yutaka Nakahara, Bunji Hirai, Mitsuharu Kanai
-
Patent number: 4692485Abstract: Vinyl benzyl 2,2,6,6-tetramethyl piperidines are provided, having the formula: ##STR1## wherein: R is selected from the group consisting of hydrogen; oxyl; acyl and alkyl having from one to about eighteen carbon atoms;X is ##STR2## in which Y is --O-- or--N(R.sub.2)--, R.sub.1 is alkyl having from one to about eighteen carbon atoms and R.sub.2 is hydrogen or alkyl having from one to about eighteen carbon atoms.Type: GrantFiled: December 5, 1985Date of Patent: September 8, 1987Assignee: Adeka Argus Chemical Co., Ltd.Inventors: William E. Leistner, Yutaka Nakahara, Bunji Hirai, Mitsuharu Kanai
-
Patent number: 4529760Abstract: Oligomers of 2,2,6,6-tetramethylpiperidinol polycarboxylic acid esters are provided having the formula: ##STR1## wherein: Z is the residue of an aliphatic or aromatic or nitriloaliphatic or hydroxy aliphatic polycarboxylic acid having from three to six carboxylic acid groups and from one to thirty carbon atoms; ##STR2## wherein R.sub.3 is hydrogen, alkyl and hydroxyalkyl having from one to about twenty carbon atoms; cycloalkyl having from six to about twenty carbon atoms; aryl having from six to about twenty carbon atoms; or cycloalkylene with the N in the ring and having from two to five carbon atoms;R is alkylene having from two to about twelve carbon atoms; cycloalkylene having from three to about twelve carbon atoms; phenylene having from six to about twenty carbon atoms; mixed alkylenecycloalkylene or alkylene phenylene or oxyalkylene having from two to about twelve carbon atoms; ##STR3## wherein R.sub.4 is alkyl having from one to about six carbon atoms;R.sub.Type: GrantFiled: November 1, 1983Date of Patent: July 16, 1985Assignee: Adeka Argus Chemical Co., Ltd.Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna, Atsushi Nishimura
-
Patent number: 4463112Abstract: Organic polyphosphites are disclosed having in the molecule at least two phosphite ester groups, at least one of which is linked through oxygen to a phenylethylidene-substituted phenyl group and to a residue of a polyhydroxy compound which is a pentaerythritol residue or a residue of a phenol or alcohol having two to three hydroxyl groups separated from one another by at least three carbon atoms.Polymer stabilizer compositions comprising an organic polyphosphite as disclosed and a known polymer stabilizer, as well as synthetic resin stabilized with such stabilizer compositions, are also disclosed.Type: GrantFiled: February 13, 1980Date of Patent: July 31, 1984Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Kazumi Kitsukawa
-
Patent number: 4460725Abstract: Polyethers containing 2,2,6,6-tetramethyl piperidinyl carboxylic acid ester or ether groups are provided, comprising polymeric units having the structure ##STR1## wherein X is selected from the group consisting of: ##STR2## R.sub.1 is selected from the group consisting of hydrogen, --O, alkyl, hydroxy alkyl and epoxyalkyl having from one to about eighteen carbon atoms, acyl having from one to about eighteen carbon atoms, cycloalkyl having from three to about eighteen carbon atoms; phenyl; phenalkyl and alkylphenyl having from seven to about twenty-four carbon atoms;R.sub.2 is hydrogen or hydroxy;n.sub.1 is 0 or 1;R.sub.3 is lower alkyl having from one to about six carbon atoms; andn is the average number of such units in the polymer; as well as stabilized synthetic resin compositions comprising such polyethers.Type: GrantFiled: March 7, 1983Date of Patent: July 17, 1984Inventors: William E. Leistner, Motonobu Minagawa, Naohiro Kubota, Toshihiro Shibata, Ryozo Arata
-
Patent number: 4450248Abstract: Piperidine-4-carboxylic acid derivatives of the formula ##STR1## wherein: R.sub.2 is hydrogen, alkyl having from one to four carbon atoms, or oxyl;R.sub.3 is --XR.sub.5 or --CN;R.sub.4 is alkylene having from two to twelve carbon atoms; cycloalkylene having from three to twelve carbon atoms; arylene having from six to twelve carbon atoms; or aralkylene having from seven to twelve carbon atoms;R.sub.5 is hydrogen, alkyl having from one to twenty carbon atoms, cycloalkyl having from five to six carbon atoms; or alkenyl having from three to twenty carbon atoms; or ##STR2## X is --O-- or --NH--; and n is 0 to 10;and the acid addition salts thereof.Type: GrantFiled: August 14, 1981Date of Patent: May 22, 1984Assignee: Phoenix Chemical CorporationInventors: William E. Leistner, Charles G. Overberger
-
Patent number: 4381360Abstract: 1,3-Dicarbonyl compounds are provided having the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are defined in the description as well as metal and organotin enolate salts thereof.The compounds are effective in enhancing the resistance to deterioration by heat and light of polyvinyl halide resins.Type: GrantFiled: January 14, 1981Date of Patent: April 26, 1983Assignee: Phoenix Chemical CorporationInventors: William E. Leistner, Motonobu Minagawa, Kouji Tsuruga, Masashi Harada
-
Patent number: 4371651Abstract: Stabilizer compositions and polyvinyl halide resin compositions containing 1,3-dicarbonyl compounds having the formula: ##STR1## as well as metal and organotin enolate salts thereof, effective in enhancing the resistance to deterioration by heat and light of polyvinyl halide resins.Type: GrantFiled: January 21, 1981Date of Patent: February 1, 1983Assignee: Phoenix Chemical CorporationInventors: William E. Leistner, Motonobu Minagawa, Kouji Tsuruga, Masashi Harada
-
Patent number: 4346025Abstract: A stabilizer composition is disclosed that enhances the resistance to deterioration upon heating of vinyl chloride polymers. The stabilizer composition comprises (A) a metal salt of a nitrogen-free monocarboxylic acid or a phenol and (B) a hydrogen phosphite ester of an ortho-phenylethylidene-substituted phenol.Vinyl chloride polymer compositions stabilized with the above disclosed stabilizer composition are also disclosed.Type: GrantFiled: February 7, 1980Date of Patent: August 24, 1982Assignee: Adeka Argus Chemical Co., Ltd.Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Kazumi Kitsukawa
-
Patent number: 4257927Abstract: New polyhydric phenol coesters are disclosed of polyhydric phenols, having 2 to 3 phenolic hydroxyl groups and 1 to 3 benzenoid rings, with carbonic acid and an inorganic acid which can be phosphorous acid, phosphoric acid, and boric acid. The new coesters have molecular weights from 700 to about 10,000, preferably from 1200 to 7000, and are highly effective stabilizers for a variety of synthetic resins.Stabilizer compositions comprising a polyhydric phenol coester and a known polymer stabilizer, as well as synthetic resins stabilized with such stabilizer compositions, are also disclosed.Type: GrantFiled: October 5, 1978Date of Patent: March 24, 1981Assignee: Argus Chemical Corp.Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna
-
Patent number: 4233414Abstract: New polyhydric phenol coesters are disclosed of polyhydric phenols, having 2 to 3 phenolic hydroxyl groups and 1 to 3 benzenoid rings, with carbonic acid and an aliphatic dicarboxylic acid having 4 to 10 carbon atoms and optionally a thioether sulfur atom in the aliphatic chain of the dicarboxylic acid. The new coesters have molecular weights from 700 to about 10,000, preferably from 1200 to 7000, and are highly effective stabilizers for a variety of synthetic resins.Stabilizer compositions comprising a polyhydric phenol coester and a known polymer stabilizer, as well as synthetic resins stabilized with such stabilizer compositions, are also disclosed.Type: GrantFiled: May 29, 1979Date of Patent: November 11, 1980Assignee: Argus Chemical CorporationInventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna
-
Patent number: 4174297Abstract: New polyhydric phenol coesters are disclosed of polyhydric phenols, having 2 to 3 phenolic hydroxyl groups and 1 to 3 benzenoid rings, with carbonic acid and an aliphatic dicarboxylic acid having 4 to 10 carbon atoms and optionally a thioether sulfur atom in the aliphatic chain of the dicarboxylic acid. The new coesters have molecular weights from 700 to about 10,000, preferably from 1200 to 7000, and are highly effective stabilizers for a variety of synthetic resins.Stabilizer compositions comprising a polyhydric phenol coester and a known polymer stabilizer, as well as synthetic resins stabilized with such stabilizer compositions, are also disclosed.Type: GrantFiled: November 9, 1976Date of Patent: November 13, 1979Assignee: Argus Chemical CorporationInventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna