Patents by Inventor Bernard Pontini

Bernard Pontini 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).

  • Silicone compounds containing sterically hindered cyclic amine functional groups which are useful for the light and thermal stabilization of polymers
    Patent number: 5792825
    Abstract: The present invention relates to linear, cyclic or branched polyorganosiloxanes having, per molecule, at least three siloxy units, including at least one functional unit of formula: ##EQU1## where R.sup.1 represents a C.sub.1 to C.sub.4 alkyl or phenyl radical and X contains a secondary or tertiary cyclic amine functional group bonded to the silicon via an Si--A--C bond where A is a residue comprising a cyclic acetal group. X more specifically represents a monovalent group of formula: ##STR1## The present invention also relates to the use of such polyorganosiloxanes in polymers for improving in particular their photostabilization.
    Type: Grant
    Filed: June 11, 1996
    Date of Patent: August 11, 1998
    Assignee: Rhone-Poulenc Chimie
    Inventors: Philippe Karrer, Gerard Mignani, Bernard Pontini, Storet Isabelle