Patents Assigned to Sigma Prodotti Chimici S.p.A.
  • Methyl piperidine derivatives of cinnamic acids, benzoic acids, benzoazols and benzophenones useful as skin anti-aging compounds
    Patent number: 5278310
    Abstract: Free radical deactivating 4- or 1,4-substituted, 2,2,6,6-tetramethyl piperidines are condensed with UV absorbing cinnamic acids or benzoic acids or benzoazols or benzophenones to produce skin anti-aging compounds and compositions which have both free radical deactivation and UV absorbing properties.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: January 11, 1994
    Assignee: Sigma Prodotti Chimici S.p.A.
    Inventor: Giuseppe Raspanti
  • Thickening agents, processes for the preparation thereof and use thereof
    Patent number: 5256737
    Abstract: Solid salts of cross-linked acrylic acid polymers or copolymers with alkali or aliphatic amines, useful as thickening agents, a process for the preparation thereof and the use thereof in the chemical, pharmaceutical, cosmetic, textile, paper industries.
    Type: Grant
    Filed: October 29, 1991
    Date of Patent: October 26, 1993
    Assignee: Sigma Prodotti Chimici S.p.A.
    Inventor: Massimo Barzaghi
  • Use of cyclic organic amines in dermatological compositions
    Patent number: 5250292
    Abstract: The use of cyclic organic amines, as free radicals deactivators, in the preparation of cosmetic and dermatological compositions.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: October 5, 1993
    Assignee: Sigma Prodotti Chimici S.p.A.
    Inventor: Giuseppe Raspanti
  • 1,3,5-triazine derivatives
    Patent number: 5233040
    Abstract: Derivatives of 2,4,6-tris-[(p-carboxy)-anilino]-5-triazine are described, which can be used as light stabilisers for synthetic polymers and for the preparation of cosmetic and dermatological compositions.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: August 3, 1993
    Assignee: Sigma Prodotti Chimici S.p.A.
    Inventor: Giuseppe Raspanti
  • Synthetic thickeners, obtained by water-in-oil emulsion polymerization, having improved characteristics for the use in textile printing
    Patent number: 5162474
    Abstract: The preparation and use of water-soluble or water-swellable copolymers by polymerization in water-in-oil emulsions of an olephinically unsaturated acid, a salt thereof, a multifunctional monomer, acrylonitrile and optionally a monomer with hydrophilic functional groups.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: November 10, 1992
    Assignee: Sigma Prodotti Chimici S.p.A.
    Inventor: Angelo Bresciani