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US 5,492,647 AGranted
Octamethylcyclotetrasiloxane azeotropes
AssigneeDow Corning Corporation
InventorsOra L. Flaningam, Dwight E. Williams
Life of this patent
Estimating the term…
Abstract
Binary azeotropes and azeotrope-like compositions contain n-butyl lactate, n-propoxypropanol, 1-butoxy-2-propanol, 1-butoxy-2-ethanol, or 4-methylcyclohexanol, with octamethylcyclotetrasiloxane, and are useful for cleaning, rinsing, or drying.
Claims14
A composition consisting essentially of an azeotrope selected from the group consisting of
- (a) about 70-99% by weight octamethylcyclotetrasiloxane and about 1-30% by weight n-butyl lactate wherein the composition is homogenous and azeotropic at a temperature within the range of about 100.degree.-180.9.degree. C. inclusive and wherein the composition has a vapor pressure of about 65 Torr at 100.degree. C. when the composition consists essentially of 99% by weight octamethylcyclotetrasiloxane and 1% by weight n-butyl lactate and wherein the composition has a vapor pressure of about 1,000 Torr at 180.9.degree. C. when the composition consists essentially of 70% by weight octamethylcyclotetrasiloxane and 30% by weight n-butyl lactate;
- (b) about 18-29% by weight octamethylcyclotetrasiloxane and about 71-82% by weight n-propoxypropanol wherein the composition is homogenous and azeotropic at a temperature within the range of about 0.degree.-157.4.degree. C. inclusive and wherein the composition has a vapor pressure of about 0.86 Torr at 0.degree. C. when the composition consists essentially of 29% by weight octamethylcyclotetrasiloxane and 71% by weight n-propoxypropanol and wherein the composition has a vapor pressure of about 1,000 Torr at 157.4.degree. C. when the composition consists essentially of 18% by weight octamethylcyclotetrasiloxane and 82% by weight n-propoxypropanol;
- (c) about 49-57% by weight octamethylcyclotetrasiloxane and about 43-51% by weight 1-butoxy-2-propanol wherein the composition is homogenous and azeotropic at a temperature within the range of about 0-177.3.degree. C. inclusive and wherein the composition has a vapor pressure of about 0.18 Torr at 0.degree. C. when the composition consists essentially of 49% by weight octamethylcyclotetrasiloxane and 51% by weight 1-butoxy-2-propanol and wherein the composition has a vapor pressure of about 1,000 Torr at 177.3.degree. when the composition consists essentially of 55% by weight octamethylcyclotetrasiloxane and 45% by weight 1-butoxy-2-propanol;
- (d) about 61-70% by weight octamethylcyclotetrasiloxane and about 30-39% by weight 1-butoxy-2-ethanol wherein the composition is homogenous and azeotropic at a temperature within the range of about 0.degree.-174.5.degree. C. inclusive and wherein the composition has a vapor pressure of about 0.16 Torr at 0.degree. C. when the composition consists essentially of 70% by weight octamethylcyclotetrasiloxane and 30% by weight 1-butoxy-2-ethanol and wherein the composition has a vapor pressure of about 1,000 Torr at 174.5.degree. C. when the composition consists essentially of 61% by weight octamethylcyclotetrasiloxane and 39% by weight 1-butoxy-2-ethanol;
- and
- (e) about 66-97% by weight octamethylcyclotetrasiloxane and about 3-34% by weight 4-methylcyclohexanol wherein the composition is homogenous and azeotropic at a temperature within the range of about 0.degree.-173.7.degree. C. inclusive and wherein the composition has a vapor pressure of about 0.13 Torr at 0.degree. C. when the composition consists essentially of 97% by weight octamethylcyclotetrasiloxane and 3% by weight 4-methylcyclohexanol and wherein the composition has a vapor pressure of about 1,000 Torr at 173.7.degree. C. when the composition consists essentially of 66% by weight octamethylcyclotetrasiloxane and 34% by weight 4-methylcyclohexanol.
3 more elements
A composition consisting essentially of an azeotrope-like composition selected from the group consisting of
- (a) about 49-88% by weight octamethylcyclotetrasiloxane and about 12-51% by weight n-butyl lactate wherein the composition is homogenous and azeotrope-like at a temperature within one degree of 171.degree. C. at 760 Torr;
- (b) about 1-51% by weight octamethylcyclotetrasiloxane and about 49-99% by weight n-propoxypropanol wherein the composition is homogenous and azeotrope-like at a temperature within one degree of 148.3.degree. C. at 760 Torr;
- (c) about 27-76% by weight octamethylcyclotetrasiloxane and about 24-73% by weight 1-butoxy-2-propanol wherein the composition is homogenous and azeotrope-like at a temperature within one degree of 167.degree. C. at 760 Torr;
- (d) about 25-80% by weight octamethylcyclotetrasiloxane and about 20-75% by weight 1-butoxy-2-ethanol wherein the composition is homogenous and azeotrope-like at a temperature within one degree of 164.5.degree. C. at 760 Torr;
- and
- (e) about 44-84% by weight octamethylcyclotetrasiloxane and about 16-56% by weight 4-methylcyclohexanol wherein the composition is homogenous and azeotrope-like at a temperature within one degree of 164.1 .degree. C. at 760 Torr.
3 more elements
Dependencies are inferred from the claim text.