Patents by Inventor Gerhard Pfahler

Gerhard Pfahler 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).

  • Polytriazinylamines, process for their preparation
    Patent number: 4504661
    Abstract: Polytriazinylpiperidylamines of the general formula ##STR1## are obtained by reacting cyanuric halides with a monofunctional amino compound and a difunctional amine, it being necessary for at least the difunctional amine to be substituted by a polyalkylpiperidyl radical. The new resinous polymers have a very low volatility. They have an atactic structure and are used to stabilize synthetic polymers towards photoinduced oxidative degradation.
    Type: Grant
    Filed: June 12, 1981
    Date of Patent: March 12, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Polytriazinyl alcohols, esters and urethanes, a process for their preparation
    Patent number: 4496726
    Abstract: Hitherto unknown polyalkylpiperidinylaminotriazines having a structure of the type ##STR1## are obtained from halogenotriazinyl compounds and aminoethylaminoethanols and can be converted into further derivatives with isocyanates, esters and acid chlorides to give new stabilizers for polymers, which stabilizers are distinguished by very good migration resistance.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: January 29, 1985
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • High-molecular esters and urethanes containing piperidine groups, a process for their preparation
    Patent number: 4476302
    Abstract: New esters and urethanes containing polyalkylpiperidylaminotriazine groups of the formula ##STR1## are prepared from carboxylic acid exters or isocyanates and triazinyl alcohols. The compounds are valuable stabilizers for polymeric materials.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: October 9, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Poly-bis-triazinylimides, their preparation
    Patent number: 4471417
    Abstract: Poly-bis-triazinylimides of the formula ##STR1## are prepared from bis-(2,4-dichloro-1,3,5-triazin-6-yl)imides and polyalkylpiperidylamines.They are used as light stabilizers for polymers.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: September 11, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Triazine stabilizers
    Patent number: 4433145
    Abstract: The invention relates to new light stabilizers and heat stabilizers which have a low volatility and are migration-resistant, for use in organic polymers. They are obtained by reacting cyanuric halides with a monoamine containing piperidine groups and a polyamine component.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: February 21, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Poly-bis-triazinylaminotriazinylamines, their preparation and their use as light stabilizers for plastics, and plastics which have been stabilized with them
    Patent number: 4409348
    Abstract: Poly-bis-triazinylaminotriazinylamines are prepared from cyanuric chloride, triazinylamines and two different diamino compounds. They are light stabilizers, of low volatility and resistant to migration, for synthetic polymers.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: October 11, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • Substituted diazaspirodecanes, their preparation and their use as stabilizers for organic polymers, and the polymers thus stabilized
    Patent number: 4405735
    Abstract: Diazaspirodecanes of the general formulae ##STR1## are reacted with epoxides or aldehydes to give alcohols and the latter are reacted with bifunctional compounds to form oligomers or polymers which can be used as light stabilizers for synthetic polymers. The alcohols can also be obtained if epoxy compounds which are substituted by the above diazaspirodecanes are converted into their formic acid esters and the latter are saponified.
    Type: Grant
    Filed: February 3, 1982
    Date of Patent: September 20, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Helmut Korbanka
  • Triazylaminotriazines, their preparation and their use for stabilizing synthetic polymers
    Patent number: 4376836
    Abstract: Triazinylaminotriazines of the general formula ##STR1## which are used as stabilizers for polymers, are prepared by reacting a cyanuric halide with amines containing triazinyl and polyalkylpiperidylamino groups.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: March 15, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler
  • 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
  • Epoxide resins containing phenol groups, their manufacture and their use
    Patent number: 4308195
    Abstract: The present invention relates to epoxide resins containing phenol groups and to homo-oligomers thereof of the structure ##STR1## that are obtained by reacting phenolcarboxylic acids with one epoxide equivalent of a polyepoxide. The new compounds are difficultly volatile and resistant to migration and can be used as stabilizers in synthetic polymers, in particular in poly-.alpha.-olefins.
    Type: Grant
    Filed: April 23, 1980
    Date of Patent: December 29, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Mayer, Gerhard Pfahler, Franz Scheidl
  • 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
  • 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