Stabilized elastomer dispersions

• US 8,053,517 B2
• Filed: 01/08/2008
• Issued: 11/08/2011
• Est. Priority Date: 02/14/2007
• Status: Expired due to Fees

• Current Assignee: Dow Corning Corporation (Dow, Inc.)
• Original Assignee: Dow Corning Corporation (Dow, Inc.)
• Inventors: Kadlec, Donald Anthony, Schulz, William James Jr., Raul, Victor Albert
• Primary Examiner(s): CAIN, EDWARD J
• Application Number:
  US12/521,330
• Publication Number:
  US 20100137470A1
• Time in Patent Office: 1,400 Days
• Field of Search: 524/730, 524/588
• US Class Current: 524/730
• CPC Class Codes: C08F 283/12 on to polysiloxanes
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 2383/14 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms C08J2383/10 takes precedence
• CPC Class Codes: C08J 3/09 in organic liquids
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 51/085 on to polysiloxanes
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

This invention pertains to neutralized silicone elastomer dispersions and methods for making neutralized silicone elastomer dispersions. This invention also pertains to compositions comprising the neutralized silicone elastomer and an acid reactive compound. The silicone elastomer dispersion are neutralized typically by blending the silicone elastomer dispersion with a base such as sodium bicarbonate or by adding a basic neutralizing agent to one or more of the raw materials used to make the silicone elastomer dispersion and removing the basic neutralizing agent by filtration or any other suitable means.

Claims

1. A neutralized silicone elastomer dispersion produced by adding a 0.001 to 1 wt % based on the weight of the silicone elastomer dispersion of a basic neutralizing agent selected from cysteine or a mixture of cysteine and sodium bicarbonate to the silicone elastomer dispersion.

2. The neutralized silicone elastomer as claimed in claim 1 wherein 0.01 to 0.1 wt % of the basic neutralizing agent is used.

3. A neutralized silicone elastomer dispersion produced by the method comprising reacting (A) a multi functional SiH containing polysiloxane and (B) C═

C containing reactant in the presence of a platinum catalyst and in the presence of (C) a solvent, to produce a silicone elastomer dispersion, thereafter adding a 0.001 to 1 wt % based on the weight of the silicone elastomer dispersion of a basic neutralizing agent selected from cysteine or a mixture of cysteine and sodium bicarbonate to silicone elastomer dispersion.

4. The silicone elastomer dispersion as claimed in claim 3 wherein the C═

C containing reactant is a alpha, omega diene.

5. The silicone elastomer dispersion as claimed in claim 3 wherein the solvent is a low molecular weight silicone.

6. The neutralized silicone elastomer as claimed in claim 3 wherein 0.01 to 0.1 wt % of the basic neutralizing agent is used.

7. A neutralized silicone elastomer dispersion produced by the method comprising treating a SiH containing polysiloxane with a neutralizing agent selected from cysteine or a mixture of cysteine and sodium bicarbonate;

reacting (A) the neutralized SiH containing polysiloxane with (B) C═

C containing reactant in the presence of a platinum catalyst and in the presence of (C) a solvent, to produce a silicone elastomer dispersion.

8. The silicone elastomer dispersion as claimed in claim 7 wherein the C═

C containing reactant is an alpha, omega diene.

9. The silicone elastomer dispersion as claimed in claim 7 wherein the solvent is a low molecular weight silicone.

10. The neutralized silicone elastomer as claimed in claim 7 wherein 0.01 wt % based on the weight of the silicone elastomer dispersion of the basic neutralizing agent is used.