Silicone oils and solvents thickened by silicone elastomers

• US 5,654,362 A
• Filed: 03/20/1996
• Issued: 08/05/1997
• Est. Priority Date: 03/20/1996
• Status: Expired due to Term

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Zhahg, Shizhong, Schulz, William James Jr.
• Primary Examiner(s): DEAN JR, RALPH H
• Application Number:
  US08/618,616
• Time in Patent Office: 503 Days
• Field of Search: 528/15, 528/25, 528/31, 524/731, 524/862, 424/401, 523/122
• US Class Current: 524/862
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/70 Siloxanes defined by use of the MDTQ nomenclature
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 3/09 in organic liquids
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes
• 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

Silicone gels are made by reacting an .tbd.Si--H containing polysiloxane with an alpha, omega-diene. The reaction is conducted in the presence of a platinum catalyst and in the presence of a low molecular weight silicone oil. The reaction is continued until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene. The silicone gel can then be crumbled into a silicone powder using mechanical force. When additional amounts of low molecular weight silicone oil are added to the gel, and the silicone oil and the gel are subjected to shear force, a silicone paste can be formed.

Claims

1. A method of thickening solvents comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R₃ SiO(R'"'"'₂ SiO)_a (R"HSiO)_b SiR₃ and optionally an .tbd.Si--H containing polysiloxane of formula HR₂ SiO(R'"'"'₂ SiO)_c SiR₂ H or formula HR₂ SiO(R'"'"'₂ SiO)_a (R"HSiO)_b SiR₂ H where R, R'"'"', and R" are alkyl groups of 1-6 carbon atoms;

a is 0-250;

b is 1-250; and

c is 0-250;

with (B) an alpha, omega-diene as only the unsaturated hydrocarbon of formula CH₂ ═

CH(CH₂)_x CH═

CH₂ where x is 1-20;

conducting the reaction in the presence of a platinum catalyst and (C) a solvent selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and

continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene.

2. A method according to claim 1 including the further steps of adding additional solvent to the gel, and subjecting the solvent and the gel to shear force until a paste is formed.

3. A method according to claim 1 including the further step of using mechanical force to crumble the gel until a powder is obtained.

4. A gel prepared according to the method in claim 1.

5. A paste prepared according to the method in claim 2.

6. A powder prepared according to the method in claim 3.

7. A method of thickening silicone oils to gel-like consistency comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R₃ SiO(R'"'"'₂ SiO)_a (R"HSiO)_b SiR₃ and optionally an .tbd.Si--H containing polysiloxane of formula HR₂ SiO(R'"'"'₂ SiO)_c SiR₂ H or formula HR₂ SiO(R'"'"'₂ SiO)_a (R"HSiO)_b SiR₂ H where R, R'"'"', and R" are alkyl groups of 1-6 carbon atoms;

a is 0-250;

b is 1-250; and

c is 0-250;

with (B) an alpha, omega-diene as the only unsaturated hydrocarbon of formula CH₂ ═

CH(CH₂)_x CH═

CH₂ where x is 1-20;

conducting the reaction in the presence of a platinum catalyst and (C) a silicone oil of formula R¹₃ SiO(R¹₂ SiO)_y SiR¹₃ or (R¹₂ SiO)_z where R¹ is an alkyl group of 1-20 carbon atoms or an aryl radical, y is 0-375, and z is 3-9; and

continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene.

8. A method according to claim 7 including the further steps of adding additional solvent to the gel, and subjecting the solvent and the gel to shear force until a paste is formed.

9. A method according to claim 7 including the further step of using mechanical force to crumble the gel until a powder is obtained.

10. A gel prepared according to the method in claim 7.

11. A paste prepared according to the method in claim 8.

12. A powder prepared according to the method in claim 9.

13. A product containing the gel of claim 10 selected from the group consisting of antiperspirants, deodorants, skin creams, skin care lotions, moisturizers, ache removers, wrinkle removers, facial cleansers, bath oils, perfumes, colognes, sachets, sunscreens, pre-shave lotions, after-shave lotions, liquid soaps, shaving soaps, shaving lathers, hair shampoos, hair conditioners, hair sprays, mousses, permanents, depilatories, cuticle coats, make-ups, color cosmetics, foundations, blushes, lipsticks, lip balms, eyeliners, mascaras, oil removers, cosmetic removers, delivery systems for oil and water soluble substances, and powders;

including products in the form of sticks, gels, lotions, aerosols, and roll-ons.

14. A product containing the gel of claim 10 and a material selected from the group consisting of crosslinked silicone rubber particles, pharmaceuticals, biocides, herbicides, pesticides, water, and water-soluble substances.

15. A method of treating hair or skin comprising applying to the hair or skin a product of claim 13.

16. A method of modifying rheological, physical, or energy absorbing properties, of silicone or organic phases selected from the group consisting of sealants, paints, coatings, greases, adhesives, antifoams, and potting compounds, comprising incorporating therein the gel of claim 10 containing crosslinked silicone rubber particles.

17. A method of filling or insulating an electrical cable comprising incorporating therein the gel of claim 10.

18. A method of stabilizing in-ground soil or water barriers comprising incorporating into soil the gel of claim 10.