Method of protecting silver contacts
AssigneeToshiba Silicones Ltd.
InventorsShuhei Kosaka, Toshihiro Fujii
Life of this patent
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Abstract
A method of protecting silver contacts in switches for electronic equipment is provided by utilizing a silicone-based grease which is comprised of a polyorganosiloxane base in combination with a thickener such as finely divided silica or a metal soap and an organomercaptan compound represented by R.sup.2 SH wherein R.sup.2 represents a saturated or unsaturated aliphatic hydrocarbon group having 18 to 22 carbon atoms. There may also be optionally included an ester bond-containing organic compound for improved properties when the treated silver contacts have relatively high contact pressure.
Claims17
A method of protecting silver contacts comprising applying to said silver contacts a grease comprising:
- (A) 100 parts by weight of a polyorganosiloxane represented by the general formula:
- ##EQU1## wherein R.sup.1 is a monovalent group selected from the group consisting of methyl, ethyl, propyl, phenyl and halogenated phenyl groups, a is a number from 1.9 to 2.7, and n is a positive integer;
- (B) 0.01 to 50 parts by weight of a thickener;
- and
- (C) 0.01 to 3 parts by weight of an organomercaptan represented by the general formula:
- R.sup.2 SH
- wherein R.sup.2 represents a saturated or unsaturated aliphatic hydrocarbon group having 18 to 22 carbon atoms.
A method of protecting silver contacts comprising applying to said contacts a grease comprising:
- (A) 100 parts by weight of a polyorganosiloxane represented by the general formula:
- ##EQU2## wherein R.sup.1 is a monovalent group selected from the group consisting of methyl, ethyl, propyl, phenyl and halogenated phenyl groups, a is a number from 1.9 to 2.7, and n is a positive integer;
- (B) 0.01 to 50 parts by weight of a thickener;
- (C) 0.01 to 3 parts by weight of an organomercaptan represented by the general formula:
- R.sup.2 SH
- wherein R.sup.2 represents a saturated or unsaturated aliphatic hydrocarbon group having 18 to 22 carbon atoms;
- and
- (D) 0.1 to 50 parts by weight of an organic compound having an ester bond.
A silicone grease comprising:
- (A) 100 parts by weight of a polyorganosiloxane represented by the general formula:
- ##EQU3## wherein R.sup.1 is a monovalent group selected from the group consisting of methyl, ethyl, propyl, phenyl and halogenated phenyl groups, a is a number from 1.9 to 2.7, and n is a positive integer;
- (B) 0.01 to 50 parts by weight of a thickener;
- and
- (C) 0.01 to 3 parts by weight of an organomercaptan represented by the general formula:
- R.sup.2 SH
- wherein R.sup.2 represents a saturated or unsaturated aliphatic hydrocarbon group having 18 to 22 carbon atoms.
Dependencies are inferred from the claim text.