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US 5,741,365 AGranted
Continuous method for cleaning industrial parts using a polyorganosiloxane
AssigneeKabushiki Kaisha Toshiba
InventorsMinoru Inada, Kimiaki Kabuki, Yasutaka Imajo, Takayuki Oguni, Noriaki Yagi, Nobuhiro Saitoh, Akitsugu Kurita, Yoshiaki Takezawa
Life of this patent
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Abstract
A continuous method for cleaning and/or removing liquid from industrial parts that includes contacting the part with a cleaning or rinsing composition that contains a straight chain or cyclic polyorganosiloxane.
Claims54
A continuous method for cleaning or removing liquid from industrial parts comprising:
- cleaning a part or removing liquid from a part by contacting the part with a cleaning composition consisting essentially of at least one polyorganosiloxane not-compatible with water selected from the group consisting of a straight chain polyorganosiloxane represented by the formula:
- ##STR10## wherein l is an integer from 0 to 5, and a cyclic polyorganosiloxane represented by the formula:
- ##STR11## wherein R.sup.1 in each of the above formulas is independently selected from the group consisting of methyl, ethyl, propyl, butyl, phenyl, trifluoro-methyl, amino, amide, acrylic acid ester and mercaptan;
- l is an integer from 0 to 5;
- and m is an integer from 3 to 7, wherein the cleaning composition is substantially free of water, and
- recovering the polyorganosiloxane of the cleaning composition and recycling it back into the method for cleaning of another part and
- removing the cleaning composition from the part.
4 more elements
A continuous method for cleaning or removing liquid from industrial parts comprising the steps of:
- (a) a cleaning step comprising cleaning or removing liquid from the parts to be cleaned in a cleaning vessel containing a polyorganosiloxane cleaning agent, and
- (b) a rinsing step comprising rinsing and cleaning said parts after cleaning or removing liquid by use of a plurality of rinsing cleaning vessels in sequence, each of the rinsing cleaning vessels containing a polyorganosiloxane rinsing agent, the rinsing cleaning vessels being connected with each other such that said rinsing cleaning agent is transmitted in sequence in the direction opposite to that in which the part is transmitted,
- (c) drying said part to completely remove said rinsing agent from the part.
A continuous method for cleaning or removing liquid from industrial parts comprising the steps of:
- (a) a cleaning step comprising cleaning or removing liquid from the parts to be cleaned in a cleaning vessel containing a polyorganosiloxane cleaning agent, and
- (b) a rinsing step comprising or rinsing and cleaning said parts after cleaning removing liquid by use of a plurality of rinsing cleaning vessels in sequence, each of the rinsing cleaning vessels containing a polyorganosiloxane rinsing agent, the rinsing cleaning vessels being connected with each other such that said rinsing cleaning agent is transmitted in sequence in the direction opposite to that in which the part is transmitted,
- wherein said rinsing step is conducted while a rinsing cleaning waste liquid is recovered from the most downstream rinsing cleaning vessel of said plurality of rinsing cleaning vessels,
- wherein the recovered rinsing cleaning waste liquid is distilled to recover polyorganosiloxanes,
- wherein the recovered polyorganosiloxanes are resupplied to the one or more of the rinsing cleaning vessels, and
- (c) drying said part to completely remove said rinsing agent from the part.
3 more elements
A continuous method for cleaning or removing liquid from industrial parts comprising:
- (a) cleaning a part or removing liquid from a part by contacting the part with a cleaning composition consisting essentially of
- (i) at least one polyorganosiloxane not-compatible with water selected from the group consisting of a straight chain polyorganosiloxane represented by the formula:
- ##STR12## and a cyclic polyorganosiloxane represented by the formula:
- ##STR13## wherein R.sup.1 in each of the above formulas is independently selected from the group consisting of methyl, ethyl, propyl, butyl, phenyl, trifluoro-methyl, amino, amide, acrylic acid ester and mercaptan;
- l is an integer from 0 to 5;
- and m is an integer from 3 to 7, wherein the cleaning composition is substantially free of water, and
- (ii) at least one agent selected from the group consisting of a surfactant or a hydrophilic solvent,
- (b) recovering the polyorganosiloxane of the cleaning composition and recycling it back into the method for cleaning of another part, and
- (c) removing said cleaning composition from the part.
6 more elements
A method for cleaning an object comprising:
- a step of cleaning said object with a cleaning composition comprising at least one polyorganosiloxane selected from the group consisting of a straight chain polyorganosiloxane represented by the formula:
- ##STR14## and a cyclic polyorganosiloxane represented by the formula:
- ##STR15## and at least one agent selected from the group consisting of a surfactant and a hydrophilic solvent that improves the volatility when coexisting with said polyorganosiloxane,
- wherein R.sup.1 in the above formula is independently selected from the group consisting of methyl, ethyl, propyl, butyl, phenyl, and trifluoro-methyl;
- l is an integer from 0 to 5, and
- wherein said cleaning composition is substantially free of water.
3 more elements
Dependencies are inferred from the claim text.