Patent TW-324742-B (TW)
Title: Octamethylcyclotetrasiloxane azeotropic composition
Inventor: ORALEY FLANINGAM
IPC: C07C27/30
Filed: 1995-09-23
Granted: 1998-01-11
Abstract: A composition for cleaning, rinsing and drying the surface of an article, which essentially comprises (a) 70-99 wt% of octamethylcyclotetrasiloxane and 1-30 wt% of n-butyl lactate, in which the composition is homogeneous and azeotropic in a temperature range of 100-180.9 degree C (inclusive), in which, when the composition essentially comprises 99 wt% of octamethylcyclotetrasiloxane and 1 wt% of n-butyl lactate, the composition has a vapor pressure of 8.6kPa (65 Torr) at 100 degree C, and when the composition essentially comprises 70 wt% of octamethylcyclotetrasiloxane and 30 wt% of n-butyl lactate, the composition has a vapor pressure of 133.3kPa (1000 Torr) at 180.9 degree C; or (b) 49-88 wt% of octamethylcyclotetrasiloxane and 12-51 wt% of n-butyl lactate, in which the composition is homogeneous and azeotropic-like in a temperature range of 1℃ at 171 degree C; or (c) 18-29 wt% of octamethylcyclotetrasiloxane and 71-82 wt% of n-propoxypropanol, in which the composition is homogeneous and azeotropic in a temperature range of 0-157.4 degree C (inclusive), in which, when the composition essentially comprises 29 wt% of octamethylcyclotetrasiloxane and 71 wt% of n-propoxypropanol, the composition has a vapor pressure of 0.1 kPa (0.86 Torr) at 0 degree C, and when the composition essentially comprises 18 wt% of octamethylcyclotetrasiloxane and 82 wt% of n-propoxypropanol, the composition has a vapor pressure of 133kPa (1,000 Torr) at 157.4 degree C; or (d) 1-51 wt% of octamethylcyclotetrasiloxane and 49-99 wt% of n-propoxypropanol, in which the composition is homogeneous and azeotropic-like in a temperature range of 1degree C at 148.3 degree C; or (e) 49-57 wt% of octamethylcyclotetrasiloxane and 43-51 wt% of 1-butoxy-2-propanol, in which the composition is homogeneous and azeotropic in a temperature range of 0-177.3 degree C (inclusive), in which, when the composition essentially comprises 49 wt% of octamethylcyclotetrasiloxane and 51 wt% of 1-butoxy-2-propanol, the composition has a vapor pressure of 24 Pa (0.18 Torr) at 0 degree C, and when the composition essentially comprises 55 wt% of octamethylcyclotetrasiloxane and 45 wt% of 1-butoxy-2-propanol, the composition has a vapor pressure of 133.3kPa (1,000 Torr) at 177.3 degree C; or (f) 27-76 wt% of octamethylcyclotetrasiloxane and 24-73 wt% of 1-butoxy-2-propanol, in which the composition is homogeneous and azeotropic-like in a temperature range of 1 degree C at 167 degree C; or (g) 61-70 wt% of octamethylcyclotetrasiloxane and 30-39 wt% of 1-butoxy-2-ethanol, in which the composition is homogeneous and azeotropic in a temperature range of 0-174.5 degree C (inclusive), in which, when the composition essentially comprises 70 wt% of octamethylcyclotetrasiloxane and 30 wt% of 1-butoxy-2-ethanol, the composition has a vapor pressure of 21 Pa (0.16 Torr) at 0 degree C, and when the composition essentially comprises 61 wt% of octamethylcyclotetrasiloxane and 39 wt% of 1-butoxy-2-ethanol, the composition has a vapor pressure of 133.3kPa (1,000 Torr) at 174.5 degree C; or (h) 25-80 wt% of octamethylcyclotetrasiloxane and 20-75 wt% of 1-butoxy-2-ethanol, in which the composition is homogeneous and azeotropic-like in a temperature range of 1 degree C at 164.5 degree C; or (I) 66-97 wt% of octamethylcyclotetrasiloxane and 3-34 wt% of 4-methylcyclohexanol , in which the composition is homogeneous and azeotropic in a temperature range of 0-173.7 degree C (inclusive), in which, when the composition essentially comprises 97 wt% of octamethylcyclotetrasiloxane and 3 wt% of 4-methylcyclohexanol, the composition has a vapor pressure of 17 Pa (0.13 Torr) at 0 degree C, and when the composition essentially comprises 66 wt% of octamethylcyclotetrasiloxane and 34 wt% of 4-methylcyclohexanol, the composition has a vapor pressure of 133.3kPa (1,000 Torr) at 173.7 degree C; or (j) 44-84 wt% of octamethylcyclotetrasiloxane and 16-56 wt% of 4-methylcyclohexanol, in which the composition is homogeneous and azeotropic-like in a temperature range of 1degree C at 164.1 degree C.