Emulsions containing crosslinked and non-crosslinked silicone polyethers

• US 20020193511A1
• Filed: 05/29/2001
• Published: 12/19/2002
• Est. Priority Date: 05/29/2001
• Status: Active Grant

• Current Assignee: Dow Corning Corporation (Dow, Inc.)
• Original Assignee: Dow Corning Corporation (Dow, Inc.)
• Inventors: Lin, Zuchen
• Granted Patent: US 6,593,422 B2
• Time in Patent Office: Days
• US Class Current: 524/806
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 3/03 in aqueous media
• CPC Class Codes: C08L 83/12 containing polyether sequences
• CPC Class Codes: C08L 83/14 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms C08L83/10 takes precedence

Abstract

Emulsions are prepared by heating and polymerizing a mixture containing (i) a non-crosslinked silicone polyether; (ii) optionally, a cosurfactant which can be a monohydroxy alcohol, diol, triol, or glycol ether; (iii) an ≡Si—H containing polysiloxane; (iv) a mono-alkenyl polyether; (v) an α,ω-diene, α,ω-diyne, or α,ω-ene-yne; (vi) optionally, a silicone oil such as (a) a low molecular weight linear or cyclic volatile methyl siloxane, or (b) a low molecular weight linear or cyclic volatile or non-volatile alkyl or aryl siloxane; (vii) a platinum catalyst; and (viii) water.

Claims

1. A method of preparing emulsions comprising heating and polymerizing a mixture containing (i) a non-crosslinked silicone polyether;

(ii) optionally, a cosurfactant selected from the group consisting of monohydroxy alcohols, diols, triols, and glycol ethers;

(iii) an ≡

Si—

H containing polysiloxane;

(iv) a mono-alkenyl polyether;

(v) an α

,ω

-diene, α

,ω

-diyne, or α

,ω

-ene-yne;

(vi) optionally, a silicone oil selected from the group consisting of (a) low molecular weight linear and cyclic volatile methyl siloxanes, and (b) low molecular weight linear and cyclic volatile and non-volatile alkyl and aryl siloxanes;

(vii) a platinum catalyst; and

(viii) water.

2. A method according to claim 1 in which the cosurfactant is selected from the group consisting of 1-butanol, 1-pentanol, 1-decanol, 1-hexadecanol, ethylene glycol, propylene glycol, trimethylene glycol, glycerol, and di(ethylene) glycol hexyl ether.

3. A method according to claim 1 in which the mixture contains

(i) 5-60 percent by weight of the non-crosslinked silicone polyether;

(ii) 5-60 percent by weight of the cosurfactant;

(iii) 5-50 percent by weight of the ≡

Si—

H containing polysiloxane;

(iv) 5-50 percent by weight of the mono-alkenyl polyether;

(v) 1-10 percent by weight of the α

,ω

-diene, α

,ω

-diyne, or α

,ω

-ene-yne;

(vi) 5-60 percent by weight of the silicone oil;

(vii) 1-100 parts per million of platinum catalyst; and

(viii) 10-60 percent by weight of water.

4. A method according to claim 1 in which the emulsion is prepared without application of any mechanical shearing force.

5. An emulsion prepared according to the method defined in claim 1.

6. A method of making oil-in-water emulsions comprising mixing (i) 1-50 percent by weight of a non-crosslinked silicone polyether;

(ii) 1-50 percent by weight of a cosurfactant selected from the group consisting of monohydroxy alcohols, diols, triols, and glycol ethers; and

(iii) 25-97.9 percent by weight of water;

with (iv) 0.1-73.0 percent by weight of a crosslinked silicone elastomer containing no oxyalkylene units prepared by reacting (a) an ≡

Si—

H containing polysiloxane;

(b) an α

,ω

-diene, α

,ω

-diyne, or α

,ω

-ene-yne;

(c) a silicone oil selected from the group consisting of (I) low molecular weight linear and cyclic volatile methyl siloxanes, and (II) low molecular weight linear and cyclic volatile and non-volatile alkyl and aryl siloxanes; and

(d) a platinum catalyst.

7. A method according to claim 6 in which the cosurfactant is selected from the group consisting of 1-butanol, 1-pentanol, 1-decanol, 1-hexadecanol, ethylene glycol, propylene glycol, trimethylene glycol, glycerol, and di(ethylene) glycol hexyl ether.

8. A method according to claim 6 in which the emulsion is prepared without application of any mechanical shearing force.

9. An emulsion prepared according to the method defined in claim 6.