Patents Assigned to Ciba-Geigy S.p.A.
  • Compounds containing piperidine groups, as stabilizers for synthetic polymers
    Patent number: 4618634
    Abstract: Novel compounds containing piperidine groups, of the general formula ##STR1## in which R.sub.1 is hydrogen, O--, cyanomethyl, C.sub.1 -C.sub.12 -alkyl, C.sub.3 -C.sub.12 -alkenyl or -alkynyl, C.sub.7 -C.sub.12 -aralkyl or C.sub.1 -C.sub.12 -acyl, m is an integer from 1 to 12, n is an integer from 1 to 3 and A is an amine radical, are suitable as light stabilizers, heat stabilizers and oxidation stabilizers for synthetic polymers. Processes for their preparation are also described.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: October 21, 1986
    Assignee: Ciba-Geigy S.p.A.
    Inventors: Giuseppe Cantatore, Valerio Borzatta
  • Piperidine compounds
    Patent number: 4608436
    Abstract: Novel piperidine compounds having a stabilizing activity for organic material, especially for synthetic polymers, are of the formula ##STR1## in which R.sub.1, R.sub.2, X and n are as defined in the text.
    Type: Grant
    Filed: April 9, 1985
    Date of Patent: August 26, 1986
    Assignee: Ciba-Geigy S.p.A.
    Inventors: Giuseppe Cantatore, Valerio Borzatta
  • Polyaminoamides containing polyalkylpiperidine radicals
    Patent number: 4578454
    Abstract: A novel class of polymeric compounds containing piperidine radicals of the formula ##STR1## in which X is a divalent radical selected from the group comprising ##STR2## is described. The novel compounds are light stabilizers, heat stabilizers and oxidation stabilizers for synthetic polymers and are particularly effective in polyolefine films, fibres and tapes.
    Type: Grant
    Filed: May 8, 1984
    Date of Patent: March 25, 1986
    Assignee: Ciba-Geigy S.p.A.
    Inventor: Giuseppe Cantatore
  • Polymeric compounds containing piperidine and triazine radicals, process for their preparation, and their use as stabilizers for synthetic polymers
    Patent number: 4547548
    Abstract: Polycondensation compounds containing piperidine and triazine groups, having a mean molecular weight from 1000 to 20,000 and constituted by structural units a and b of the formula ##STR1## are suitable as anti-actinic stabilizers for incorporation in polymeric materials.
    Type: Grant
    Filed: July 19, 1984
    Date of Patent: October 15, 1985
    Assignee: Ciba-Geigy S.p.A.
    Inventor: Giuseppe Cantatore
  • Polymeric compounds, containing piperidine radicals, a process for their preparation, and their use as stabilizers for synthetic polymers
    Patent number: 4546148
    Abstract: Novel polycondensed compounds containing piperidine groups of polycarbamate structure, of the general formula: ##STR1##
    Type: Grant
    Filed: July 19, 1984
    Date of Patent: October 8, 1985
    Assignee: Ciba-Geigy S.p.A.
    Inventor: Giuseppe Cantatore
  • Process for preparing 2,2,6,6-tetramethyl-4-piperidone
    Patent number: 4536581
    Abstract: A process for preparing 2,2,6,6-tetramethyl-4-piperidone from ammonia and acetone, wherein acetone and ammonia are reacted in a single stage for a time of 2 to 8 hours in an acetone:ammonia molar ratio of 20:1 to 4:1, at a temperature of 50.degree. to 120.degree. C. and at a pressure of 1 to 50 atmospheres, in the presence of 0.001-0.1 moles of acid catalysts per mole of acetone used in the reaction.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: August 20, 1985
    Assignee: Ciba-Geigy S.p.A.
    Inventors: Giuseppe Cantatore, Paolo Cassandrini
  • Piperidine derivatives which are stabilizers for synthetic polymers
    Patent number: 4525503
    Abstract: The invention relates to new piperidine compounds which act as light stabilizers, heat stabilizers and oxidation stabilizers for synthetic polymers, in particular for hydrocarbon polymers. The compounds are piperidinol carbamates of the formula: ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and A have the meanings defined in the description and y is an integer from 1 to 4. In particular, A represents a monovalent to tetravalent radical, always bonded to the carboxy-piperidine radicals via nitrogen atoms.
    Type: Grant
    Filed: September 8, 1982
    Date of Patent: June 25, 1985
    Assignee: Ciba-Geigy S.p.A.
    Inventor: Giuseppe Cantatore
  • Piperidine derivatives which are stabilisers for synthetic polymers
    Patent number: 4501837
    Abstract: The invention relates to new piperidine compounds which act as light stabilisers, heat stabilisers and oxidation stabilisers for synthetic polymers, in particular for hydrocarbon polymers. The compounds are piperidinol carbamates of the formula: ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and A have the meanings defined in the description and y is an integer from 1 to 4. In particular, A represents a monovalent to tetravalent radical, always bonded to the carboxy-piperidine radicals via nitrogen atoms.
    Type: Grant
    Filed: August 31, 1982
    Date of Patent: February 26, 1985
    Assignee: Ciba-Geigy S.p.A.
    Inventor: Giuseppe Cantatore