Lyotropic liquid crystals and vesicles

• US 7,781,556 B2
• Filed: 07/28/2006
• Issued: 08/24/2010
• Est. Priority Date: 08/17/2005
• Status: Expired due to Fees

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Lafore, Michael Richard, Lin, Zuchen
• Primary Examiner(s): Choi; Ling-Siu
• Assistant Examiner(s): WANG, CHUN CHENG
• Application Number:
  US11/990,423
• Publication Number:
  US 20090111963A1
• Time in Patent Office: 1,488 Days
• Field of Search: 528/15, 528/31
• US Class Current: 528/15
• CPC Class Codes: C08G 77/46 containing polyether sequences
• CPC Class Codes: C08G 77/50 by carbon linkages C08G77/485 takes precedence
• CPC Class Codes: C09K 19/408 Polysiloxanes

Abstract

Silicone based liquid crystal and vesicles are prepared by first reacting (A) an ≡Si—H containing polysiloxane, (B) a mono-alkenyl polyether, in the presence of a platinum catalyst until an ≡Si—H containing polysiloxane with polyether groups (C) is formed. The ≡Si—H containing polysiloxane with polyether groups (C) is then reacted with (D) an unsaturated hydrocarbon such as an α,ω-dienes, and (E) water, in the presence of a platinum catalyst until the silicone based liquid crystal or vesicle is formed. The silicone based liquid crystal or vesicle can also be heated until a hard liquid crystal gel or vesicle paste are formed.

Claims

1. A method of making a silicone based liquid crystal or vesicle comprising reacting:

(A) an ≡

Si—

H containing polysiloxane (i) of the formula R₃SiO(R′

₂SiO)_a(R″

HSiO)_bSiR₃, (ii) of the formula HR₂SiO(R′

₂SiO)_cSiR₂H, or (iii) the formula HR₂SiO(R′

₂SiO)_a(R″

HSiO)_bSiR₂H, where in the formulas, R, R′

, and R″

, are alkyl groups with 1-6 carbon atoms;

a is 0-250;

b is 1-50; and

c is 0-250; and

(B) a mono-alkenyl polyether of the formula CH₂═

CH(CH₂)_xO(CH₂CH₂O)_y[CH₂CH(CH₃)O]_zR, in which R represents hydrogen or an alkyl group containing 1-10 carbon atoms;

x is 1-6;

y is zero or has a value of 4-100;

z is zero or has a value of 4-100;

provided y or z are both not zero;

in the presence of a platinum catalyst until an ≡

Si—

H containing polysiloxane with polyether groups is formed;

and then reacting;

(C) the ≡

Si—

H containing polysiloxane with polyether groups;

(D) an unsaturated hydrocarbon selected from the group consisting of α

,ω

-dienes having the formula CH₂═

CH(CH₂)_xCH═

CH₂ where x is 1-20;

α

,ω

-diynes of the formula CH≡

C(CH₂)_x≡

CH where x is 1-20; and

α

,ω

-ene-ynes of the formula CH₂═

CH(CH₂)_x≡

CH where x is 1-20; and

(E) water;

in the presence of a platinum catalyst until a silicone based liquid crystal or vesicle is formed.

2. A method according to claim 1 including the further step (F) of heating the silicone based liquid crystal or vesicle until a hard liquid crystal gel or vesicle paste are formed.

3. A method according to claim 1 in which a solvent is optionally present during the reaction of (A), (B), and the platinum catalyst, and is removed before the reaction of (C), (D), (E), and the platinum catalyst.

4. A method according to claim 1 in which a buffer is optionally present during the reaction of (A), (B), and the platinum catalyst, and is removed before the reaction of (C), (D), (E), and the platinum catalyst.

5. A method according to claim 1 in which the reaction of (C), (D), (E), and the platinum catalyst is free of the presence of any other component having surfactant properties.

6. A method according to claim 1 in which the molar ratio of the mono-alkenyl polyether to the ≡

SiH in the ≡

SiH siloxane is more than zero and less than one.

7. A method according to claim 1 in which the weight ratio of water to the weight of the ≡

SiH siloxane with polyether groups and the α

,ω

-diene is 1-98.

8. A method according to claim 7 in which the weight ratio of water to the weight of the ≡

SiH siloxane with polyether groups and the α

,ω

-diene is 3-10.