Patents by Inventor Hartmut Wiezer

Hartmut Wiezer 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).

  • Ethers based on polyalkyl-1-oxadiazaspirodecanes
    Patent number: 4340534
    Abstract: The invention relates to epoxy compounds which can be polymerized to give polyethers and which are formed from polyalkyl-1-oxadiazaspirodecanes of the formula ##STR1## in which X is a group ##STR2## and an epihalogenohydrin by linking the nitrogen atom of the 5-membered ring to the 2,3-epoxypropyl radical. Polyethers which have degrees of polymerization of up to approx. 50 and which exhibit a very low volatility and are suitable as light stabilizers for organic polymers can be obtained by heating the epoxides.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: July 20, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Triazine derivatives
    Patent number: 4335242
    Abstract: The invention relates to polymers of triazine compounds containing piperidine groups which may serve as low volatile and migration-resistant light stabilizers for synthetic polymers. They have the structure ##STR1## and are obtained from cyanuric halides, diamines and polyalkylpiperidylamino compounds.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: June 15, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Alkylated diaza-spirodecanes
    Patent number: 4319030
    Abstract: The invention provides derivatives of polyalkyl-1-oxa-diaza-spirodecanes prepared from compounds of the formula ##STR1## in which X is ##STR2## and mono- or dihalo-hydrocarbons by alkylation at the nitrogen atom of the 5-membered ring, and the salts thereof. The novel compounds are migration-resistant light stabilizers of low volatility for synthetic polymers.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: March 9, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Harald Haberlein, Gunther Nowy
  • Copolymers of substituted piperidines, their manufacture and use
    Patent number: 4308362
    Abstract: The invention relates to copolymers of polyalkyl piperidines which are substituted by a polymerizable group and which have the formula ##STR1## with olefinic comonomers such as ethylene, styrene, vinyl acetate, acrylates or methacrylates. The copolymers which have a molecular weight of from 1,000 to 10,000 are used as light stabilizers for synthetic polymers which do not migrate to the surface of the polymers.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: December 29, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Norbert Mayer
  • Process for the manufacture of 7-nitro-1,3,5-triaza-adamantane
    Patent number: 4267322
    Abstract: The invention relates to an improved process for the manufacture of 7-nitro-1,3,5-triaza-adamantane from hexamethylene tetramine and nitromethane, using alcohols or carboxylic acids as solvent the water content of which is not allowed to exceed a defined level. The product of the process is obtained with good yield and a high purity degree.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: May 12, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hartmut Wiezer
  • Urea derivatives, process for their manufacture and their use as light protecting agents for polymers
    Patent number: 4247449
    Abstract: The amide nitrogen of 9,9-dimethyl-2-oxa-4-oxo-3,8-diazaspiro-(4,5)-decane reacts with isocyanates or diisocyanates to give novel urea derivatives which can be used as light stabilizers for plastic materials.
    Type: Grant
    Filed: July 31, 1979
    Date of Patent: January 27, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Norbert Mayer, Harald Knorr
  • Substituted piperidine hydroxamides, their preparation, and their use as light stabilizers
    Patent number: 4239891
    Abstract: The invention provides novel derivatives of 2,2-dimethyl-6,6-dialkyl-4-hydroxy-4'-carbamoyl-piperidines which carry a substituent at the amide nitrogen atom, and optionally a further substituent at the ring nitrogen atom, and a process for preparing these compounds.The products, optionally in the form of salts, are used for stabilizing thermoplastics against the damaging influence of light.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: December 16, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Norbert Mayer
  • Novel polyalkyl-piperidine polymers, their preparation and use
    Patent number: 4234471
    Abstract: By reacting polyalkyl-piperidones-4 with the 0.5- to 1.1-molar amount of formaldehyde in the presence of an aliphatic monoalcohol at 50.degree. to 180.degree. C., polymers of a polymerization degree of from 2 to about 200 are obtained, which may be hydrogenated or partially hydrogenated. Especially in this form, they are suitable as light stabilizers for synthetic polymers and as intermediate products for the preparation of other stabilizers for plastic materials.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: November 18, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Helmut Korbanka, Gerhard Pfahler
  • Glycerol phosphites esterified with phenolcarboxylic acids
    Patent number: 4229382
    Abstract: The invention provides novel esters of glycerol, in which one of the OH groups of the glycerol is esterified with a phenolcarboxylic acid, while the two other OH groups are esterified with phosphoric or phosphorous acid, substituted by long-chain alcohols, amines, mercaptans or phenol compounds. The products are suitable as light and heat stabilizers for plastics. They are distinguished by a high resistance to hydrolysis and extraction.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: October 21, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Franz Scheidl, Hartmut Wiezer
  • Polyalkyl-piperidine diols and process for their preparation
    Patent number: 4223148
    Abstract: The invention provides novel polyalkyl-piperidine diols of the formula ##STR1## in which X.noteq.Y and each stands for --H or --OH. They are prepared from the corresponding piperideines which are converted to the epoxides with organic peracids in an organic solvent, and subsequently the epoxide ring is split by addition of water. The products of the invention are suitable for the synthesis of polymer stabilizers for plastic materials.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: September 16, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hartmut Wiezer
  • Process for the manufacture of aza-spirodecanes
    Patent number: 4220773
    Abstract: For preparing 1-oxa-diaza-oxo-spirodecanes of the formula ##STR1## where X.noteq.Y, standing for ##STR2## either a polyalkylpiperidone-4-cyanohydrine is reacted with an aldehyde or a ketone, or a polyalkyl-piperidone-4 is reacted with an aldehyde or ketone-cyanohydrine in a liquid aliphatic carboxylic acid as solvent.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: September 2, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Helmut Korbanka, Norbert Mayer
  • Phosphites of polyalcohols
    Patent number: 4207270
    Abstract: The invention relates to mixed esters of phosphorous or phosphoric acid having on the one hand open chain polyalcohols and on the other hand long chain alkyl compounds with activated hydrogen, for example, alcohols, mercaptans and amines. The compounds are suitable as light and heat stabilizers for polyolefins and for chlorine-containing thermoplastic compositions and are furthermore distinguished by a high resistance to hydrolysis.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: June 10, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer
  • Urea derivatives, their preparation, and their use as light stabilizers
    Patent number: 4191684
    Abstract: The invention provides novel 4-carbamoyl derivatives of 1-oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and their preparation from 1 oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and isocyanates. The products are suitable light stabilizers for thermoplastics.
    Type: Grant
    Filed: August 21, 1978
    Date of Patent: March 4, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Norbert Mayer, Harald Knorr
  • N-substituted triaza-adamantanyl ureas as stabilizers for thermoplastic materials
    Patent number: 4168260
    Abstract: The invention relates to a process for the stabilization of halogen-free or halogen-containing synthetic polymers against the degradation by light and heat, which comprises the addition of special 1,3,5-triaza-7-adamantanyl ureas to the polymers.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: September 18, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Norbert Mayer
  • Bis-(alkylphenyl)-alkanecarboxylic acid hydrazides, their preparation and use
    Patent number: 4162247
    Abstract: Bis-(alkylphenol)-alkanecarboxylic acid hydrazides are obtained by reaction of bisphenol-alkanecarboxylic acid chlorides, azides, anhydrides or esters with hydrazine hydrate, at a temperature of from 5 to 200.degree. C. These hydrazides are excellent stabilizers for plastic materials, especially polyolefins.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: July 24, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer
  • Substituted triazaadmantane compounds
    Patent number: 4142047
    Abstract: 7-[N-(2-alkylidenimino-isobutylamino)]-1,3,5-triazaadamantanes and 7-[N-(2-arylidenimino-isobutylamino)]-1,3,5-triazaadamantane are prepared from 7-amino-1,3,5-triazaadamantane by two condensation steps. The new compounds are very good stabilizers against decomposition of polymers by heat and UV-light.
    Type: Grant
    Filed: April 11, 1977
    Date of Patent: February 27, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer
  • Derivatives of 1-oxa-3,8-diaza-spiro-[4,5]-decanes
    Patent number: 4110334
    Abstract: Derivatives of 1-oxa-3,8-diaza-spiro-[4,5]-decane, which be prepared by reacting a 2,2-dimethyl-6,6-dialkyl-4-hydroxy-4-carbamoylpiperidine with an aldehyde or ketone, are excellently suitable as light stabilizers for organic materials.
    Type: Grant
    Filed: February 9, 1977
    Date of Patent: August 29, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer
  • 1-Oxa-4,8-diazaspiro[4,5]decanes and polymers stabilized against UV light with these compounds
    Patent number: 4107139
    Abstract: New 1-oxa-4,8-diazaspiro[4,5]decanes are prepared by reacting a dimethyl-dialkyl-piperidone with an .alpha.-hydroxyamide in the presence of a condensation catalyst. The compounds can be used as UV stabilizers for polymers.
    Type: Grant
    Filed: August 9, 1977
    Date of Patent: August 15, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer
  • Substituted tetraalkylpiperidone-4-oximes
    Patent number: 4104251
    Abstract: Novel derivatives of 2,2,6,6-tetraalkylpiperidone-4-oximes constitute excellent stabilizers for synthetic polymer compositions against the action of ultraviolet radiation and heat. The compounds can be used either per se or in admixture with known stabilizers.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: August 1, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Norbert Mayer
  • 14-Substituted 7,15-diazadispiro-?5.1.5.3!-hexadecanes as UV stabilizers
    Patent number: 4097452
    Abstract: By incorporating a substituted diazadispiro-hexadecane into a plastic composition the heat and light stability of this composition is considerably increased.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: June 27, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Hartmut Wiezer