Heat stabilized silicone elastomers

US4777087A · kind A · utility

Assignee

• Xerox Corporation · US

Inventors

• George J. Heeks · Rochester, US
• Arnold W. Henry · Penfield, US
• Edward L. Schlueter, Jr. · Rochester, US

Key dates

• Filing date: Feb 24, 1987
• Grant date: Oct 11, 1988
• Expiry date: Feb 24, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A silicone composition curable to a heat stabilized silicone elastomer comprising at least one polyorganosiloxane having the formula: ##STR1## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, EQU 0<(m/n).ltoreq.1 and m+n>350, a complex comprising a transition metal salt of at least one polydentate chelating ligand having the formula: ##STR2## where each R.sub.1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon, atoms R'.sub.1, is an X' substituted R.sub.1, each of Z and E may be any of carboxy thiocarboxy, dithiocarboxy, or --N(R.sub.2).sub.2, --A.sub.s (R.sub.2).sub.2, --S(R.sub.2) where each R.sub.2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or any aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R.sub.2).sub.2, --A.sub.s (R.sub.2).sub.2, or --S(R.sub.2), X is --N(R.sub.2)--, --A.sub.s (R.sub.2)--, or --S-- and p is 0 to 4 present in the composition in an amount sufficient to inhibit oxidative degradation of the polyo…