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US 5,507,878 AGranted
Azeotropes of octamethyltrisiloxane and aliphatic or alicyclic alcohols
AssigneeDow Corning Corporation
InventorsOra L. Flaningam, Dwight E. Williams
Life of this patent
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Abstract
Binary azeotropic and azeotrope-like compositions contain 1-heptanol, cyclohexanol, or 4-methylcyclohexanol, with octamethyltrisiloxane, and the compositions are useful for cleaning, rinsing, or drying.
Claims8
A method of cleaning, rinsing, or drying the surface of an article comprising applying to the surface an azeotropic or azeotrope-like composition consisting essentially of:
- (a) about 91-98% by weight octamethyltrisiloxane and about 2-9% by weight 1-heptanol, wherein the composition is homogenous and azeotropic at a temperature within the range of about 135.degree.-162.4.degree. C. inclusive, wherein the composition has a vapor pressure of about 360.2 Torr at 135.degree. C. when the composition consists essentially of 98% by weight octamethyltrisiloxane and 2% by weight 1-heptanol, and wherein the composition has a vapor pressure of about 1,000 Torr at 162.4.degree. C. when the composition consists essentially of 91% by weight octamethyltrisiloxane and 9% by weight 1-heptanol;
- or
- (b) about 74-98% by weight octamethyltrisiloxane and about 2-26% by weight cyclohexanol, wherein the composition is homogenous and azeotropic at a temperature within the range of about 75.degree.-156.6.degree. C. inclusive, wherein the composition has a vapor pressure of about 54.9 Torr at 75.degree. C. when the composition consists essentially of 98% by weight octamethyltrisiloxane and 2% by weight cyclohexanol, and wherein the composition has a vapor pressure of about 1,000 Torr at 156.6.degree. C. when the composition consists essentially of 74% by weight octamethyltrisiloxane and 26% by weight cyclohexanol;
- or
- (c) about 88-99% by weight octamethyltrisiloxane and about 1-12% by weight 4-methylcyclohexanol, wherein the composition is homogenous and azeotropic at a temperature within the range of about 125.degree.-161.9.degree. C. inclusive, wherein the composition has a vapor pressure of about 345.8 Torr at 125.degree. C. when the composition consists essentially of 99% by weight octamethyltrisiloxane and 1% by weight 4-methylcyclohexanol, and wherein the composition has a vapor pressure of about 1,000 Torr at 161.9.degree. C. when the composition consists essentially of 88% by weight octamethyltrisiloxane and 12% by weight 4-methylcyclohexanol.
2 more elements
A method of cleaning, rinsing, or drying the surface of an article comprising applying to the surface an azeotropic or azeotrope-like composition consisting essentially of:
- (a) about 78-99% by weight octamethyltrisiloxane and about 1-22% by weight 1-heptanol, wherein the composition is homogeneous and azeotrope-like at a temperature within one degree of 152.1.degree. C. at 760 Torr;
- or
- (b) about 54-89% by weight octamethyltrisiloxane and about 11-46% by weight cyclohexanol, wherein the composition is homogeneous and azeotrope-like at a temperature within one degree of 147.degree. C. at 760 Torr;
- or
- (c) about 74-99% by weight octamethyltrisiloxane and about 1-26% by weight 4-methylcyclohexanol, wherein the composition is homogeneous and azeotrope-like at a temperature within one degree of 151.9.degree. C. at 760 Torr.
2 more elements
Dependencies are inferred from the claim text.