Silicone based emulsion, method for making same, and waterborne co-binder resin compositions comprising such emulsions

Patent metadata

Field	Value
Publication number	US-10487240-B2
Application number	US-201615204379-A
Country	US
Kind code	B2
Filing date	Jul 7, 2016
Priority date	Jul 9, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A crosslinkable silicone based emulsion composition includes a hydroxylated polydiorganopolysiloxane grafted onto at least one colloidal silica dispersion, wherein the at least one hydroxylated polydiorganopolysiloxane grafted onto the least one colloidal silica dispersion contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane. Further, a waterborne co-binder silicone-organic resin composition includes (A) the crosslinkable silicone emulsion and (B) an organic resin emulsion which provides improved cured properties including, but not limited to, improved hydrophobicity (water resistance), scratch resistance and gloss retention as well as process for making the emulsions and the compositions.

First claim

What is claimed is:

1. A crosslinkable silicone based emulsion composition comprising:
at least one hydroxylated polydiorganopolysiloxane grafted onto at least one colloidal silica dispersion having an average particle size of greater than 100 nanometers;
at least one catalyst;
at least one emulsion stabilizer;
at least one surfactant; and
water,
wherein the at least one hydroxylated polydiorganopolysiloxane grafted onto the at least one colloidal silica dispersion contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane.

2. The composition of claim 1 further comprising at least one organic resin.

3. The composition of claim 1 wherein the at least one surfactant is a non-ionic surfactant, an anionic surfactant or a combination thereof.

4. The composition according to claim 1 , wherein the hydroxylated polydiorganosiloxane has a weight average molecular weight of from about 5,000 to about 1,000,000.

5. The composition according to claim 1 , wherein the hydroxylated polydiorganosiloxane has a weight average molecular weight of from about 200,000 to about 1,000,000.

6. The composition of claim 1 , wherein the hydroxylated polydiorganosiloxane is a hydroxyl-terminated polydimethylsiloxane.

7. The silicone composition according to claim 1 , wherein the colloidal silica dispersion comprises silica particles having an average particle size of greater than 100 nanometers and less than or equal to about 125 nanometers.

8. The composition according to claim 1 , wherein the catalyst comprises a metal compound selected from the group consisting of tin, titanium, zirconium, lead, iron cobalt, antimony, manganese, bismuth, zinc compounds and combinations thereof.

9. A crosslinkable silicone based emulsion composition comprising:
at least one hydroxylated polydiorganopolysiloxane grafted onto at least one colloidal silica dispersion;
at least one catalyst;
at least one emulsion stabilizer which is one or more organic amine compounds selected from the group consisting of 2-amino-2-methyl-1-propanol (AMP), 2-amino-1-butanol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-hydroxymethyl-1,3-propanediol, N-methyl derivatives of 2-amino-2-hydroxymethyl-1,3-propanediol, N-ethyl derivatives of 2-amino-2-hydroxymethyl-1,3-propanediol, N,N-dimethyl derivatives of 2-amino-2-hydroxymethyl-1,3-propanediol, N,N-diethyl derivatives of 2-amino-2-hydroxymethyl-1,3-propanediol and combinations thereof;
at least one surfactant; and
water, wherein the at least one hydroxylated polydiorganopolysiloxane grafted onto the at least one colloidal silica dispersion contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane.

10. A water-borne co-binder silicone-organic resin composition comprising:
i) at least one hydroxylated polydiorganopolysiloxane;
ii) at least one colloidal silica dispersion having an average particle size of greater than 100 nanometers,
iii) at least one catalyst,
iv) at least one emulsion stabilizer,
v) at least one surfactant,
vi) at least one organic resin, and
vii) water,

wherein the at least one hydroxylated polydiorganopolysiloxane is grafted onto the at least one colloidal silica dispersion to form a reaction product which contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane.

11. The water-borne co-binder silicone-organic resin composition of claim 10 wherein the composition is a mixture comprising:
(A) a crosslinkable silicone based emulsion comprising the reaction product of (i) the at least one hydroxylated polydiorganopolysiloxane and (ii) the colloidal silica dispersion having an average particle size of greater than 100 nanometers, and
(i) the at least one catalyst,
(ii) the at least one emulsion stabilizer,
(iii) the at least one surfactant, and
(iv) water,

wherein the reaction product of the at least one hydroxylated polydiorganopolysiloxane grafted onto the at least one colloidal silica dispersion contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane; and
(B) an organic resin emulsion comprising water, the at least one surfactant and the at least one organic resin; and
optionally (C) an epoxy functional polysiloxane and/or an emulsion of an alkylpolysilsesquioxane.

12. The waterborne co-binder silicone-organic resin composition according to claim 11 , wherein the crosslinkable silicone based emulsion (A) is present in an amount of from about 5 to about 100 parts by weight per 100 parts of the organic resin emulsion (B).

13. The waterborne co-binder silicone-organic resin composition according to claim 11 , wherein the organic resin emulsion (B) is a latex polymer obtainable by emulsion polymerization of at least one ethylenically unsaturated monomer in water, a polyurethane emulsion or dispersion, a polyether emulsion, or an epoxy resin emulsion.

14. The waterborne co-binder silicone-organic resin composition according to claim 10 , wherein each of the at least one hydroxylated polydiorganosiloxane, the at least one catalyst and the at least one organic resin are emulsions.

15. A water-borne co-binder silicone-organic resin composition comprising:
(A) a crosslinkable silicone based emulsion comprising the reaction product of (i) at least one hydroxylated polydiorganopolysiloxane and (ii) colloidal silica having a particle size of greater than 100 nanometers, and
(iii) at least one catalyst,
(iv) at least one emulsion stabilizer,
(v) at least one surfactant, and
(vi) water,

wherein the reaction product of (i) and (ii) is formed by heating at a temperature of from about 40° C. to 100° C. for about 1 to about 72 hours the mixture of components (i) to (vi) and wherein the at least one hydroxylated polydiorganopolysiloxane (i) and the at least one catalyst (iii) are emulsified using the at least one surfactant (v); and
(B) an organic resin emulsion comprising water, at least one surfactant and the at least one organic resin,

wherein said water-borne co-binder silicone-organic resin composition is a coating, adhesive or sealant composition.

16. A waterborne co-binder silicone resin composition comprising an organic resin emulsion and a crosslinkable silicone based emulsion made by the process comprising:
(a) adding a colloidal silica dispersion having an average particle size greater than 100 nanometers, a catalyst, and an emulsion stabilizer to a first emulsion comprising a non-ionically or an anionically stabilized hydroxylated polydiorganosiloxane to form a second emulsion; and
(b) heating the second emulsion to a temperature of from about 40° C. to about 100° C. to form a reaction product of the at least one hydroxylated polydiorganopolysiloxane grafted onto the at least one colloidal silica dispersion which contains residual silanol groups from the at least one hydroxylated polydiorganopolysiloxane.

17. A waterborne co-binder silicone resin composition comprising an organic resin emulsion, at least one epoxy functional polysiloxane and a crosslinkable silicone based emulsion made by a process comprising:
(a) adding a colloidal silica dispersion, a catalyst and an emulsion stabilizer to a first emulsion comprising a non-ionically or an anionically stabilized hydroxylated polydiorganosiloxane to form a second emulsion; and
(b) heating the second emulsion to a temperature of from about 40° C. to about 100° C. to form a reaction product of the at least one hydroxylated polydiorganopolysiloxane grafted onto the at least one colloidal

Assignees

• Momentive Performance Mat Inc

Inventors

• Jiang Ping
• Maio Louisa
• Kumar Vikram
• Wusik Martin
• Tiwary Yogesh
• Seeber Michael

Classifications

• C09D5/027

  Dispersing agents (anti-settling agents C09D7/45) · CPC title

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C09D5/022

  Emulsions, e.g. oil in water · CPC title

• C09D7/63

  organic · CPC title