Fillers, pigments and mineral powders treated with organopolysiloxanes

Patent metadata

Field	Value
Publication number	US-9115285-B2
Application number	US-44143607-A
Country	US
Kind code	B2
Filing date	Sep 17, 2007
Priority date	Sep 18, 2006
Publication date	Aug 25, 2015
Grant date	Aug 25, 2015

Abstract

A filler, pigment or mineral powder surface treated with a silicon compound is described. The silicon compound is a polydiorganosiloxane having at least one terminal group of the formula —SiR″(OR′) 2 or —Si(OR′) 3 , wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms. The filler, pigment or mineral powder treated is hydrophobic and is used in composites or industrial processes.

First claim

The invention claimed is:

1. A filler, pigment or mineral powder surface treated by chemical interaction with a silicon compound, wherein the silicon compound is a polydiorganosiloxane having at least two terminal groups of the formula —SiR″(OR′) 2 , wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms, wherein the polydiorganosiloxane has a vapour pressure lower than 2000 Pa at 25° C.

2. The treated filler, pigment or mineral powder according to claim 1 wherein R″ represents an alkyl group having 3 to 8 carbon atoms.

3. The treated filler, pigment or mineral powder according to claim 1 wherein the degree of polymerisation of the polydiorganosiloxane is 4 to 250 siloxane units.

4. The treated filler, pigment or mineral powder according to claim 1 wherein the polydiorganosiloxane is derived from the reaction of a hydroxyl-terminated polydiorganosiloxane with an alkoxysilane of the formula R″Si(OR′) 3 in the presence of a catalyst for the condensation of silanol groups with Si-alkoxy groups, wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms.

5. The treated filler, pigment or mineral powder according to claim 1 wherein the polydiorganosiloxane is a linear polydiorganosiloxane.

6. The treated filler, pigment or mineral powder according to claim 1 wherein the polydiorganosiloxane is a branched polydiorganosiloxane.

7. The treated filler, pigment or mineral powder according to claim 6 wherein the polydiorganosiloxane contains branching sites derived from the reaction of a molecule of an alkoxysilane of the formula R″Si(OR′) 3 with at least 3 silanol groups of a hydroxyl-terminated polydiorganosiloxane, wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms.

8. The treated filler, pigment or mineral powder according to claim 6 wherein the polydiorganosiloxane contains branching sites derived from the reaction of a hydroxyl-terminated polydiorganosiloxane with an alkoxysilane of the formula R″Si(OR′) 3 in the presence of a branched organosilicon resin and a catalyst for the condensation of silanol groups with Si-alkoxy groups, wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms.

9. The treated filler, pigment or mineral powder according to claim 6 wherein the polydiorganosiloxane contains branching sites derived from the reaction of a branched hydroxyl-terminated polydiorganosiloxane with an alkoxysilane of the formula R″Si(OR′) 3 , wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms.

10. A process for the surface treatment of a filler, pigment or mineral powder with a silicon compound, wherein the silicon compound is a polydiorganosiloxane having at least two terminal groups of the formula —SiR″(OR′) 2 , wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms, wherein the surface treatment includes chemical interaction between the surface and the silicon compound, and wherein the polydiorganosiloxane has a vapour pressure lower than 2000 Pa at 25° C.

11. The process according to claim 10 , wherein the filler, pigment or mineral powder is treated with a mixture of the polydiorganosiloxane and an aminosilane or aminosiloxane.

12. The process according to claim 10 , wherein the filler, pigment or mineral powder is treated with a mixture of the polydiorganosiloxane and a nonlinear organosilicon resin containing Si—OH groups or Si-alkoxy groups.

13. A plastics or rubber composition wherein the plastics o rubberr contains the filler or pigment as claimed in claim 1 .

14. A process for producing a plastics or rubber composition wherein the filler or pigment as claimed in claim 1 is mixed with a plastics or rubber matrix material.

15. A process for producing a plastics or rubber composition, wherein an organic plastics or rubber matrix material is mixed with a filler or pigment and a polydiorganosiloxane having at least two terminal groups of the formula —SiR″(OR′) 2 , wherein R″ represents an alkyl, substituted alkyl, alkenyl or aryl group and each R′ represents an alkyl group having 1 to 4 carbon atoms, wherein a surface of the filler or pigment is treated by chemical interaction with the polydiorganosiloxane, and wherein the polydiorganosiloxane has a vapour pressure lower than 2000 Pa at 25° C.

16. The treated filler, pigment or mineral powder according to claim 1 wherein R″ represents propyl, vinyl, aminopropyl, phenyl, methacryloxypropyl, or glycidoxypropyl, and wherein R′ represents methyl or ethyl.

17. The treated filler, pigment or mineral powder according to claim 1 wherein the treated filler, pigment or mineral powder is hydrophobic.

18. The treated filler, pigment or mineral powder according to claim 1 , wherein R″ represents propyl, haloalkyl, aminopropyl, phenylmethyl, vinylbenzylethylenediaminepropyl, methacryloxypropyl, or glycidoxypropyl.

Assignees

• Chevalier Pierre
• Dow Corning

Inventors

• Chevalier Pierre

Classifications

• C09C1/3684

  Treatment with organo-silicon compounds · CPC title

• C09C1/024

  Coating · CPC title

• C09C1/40

  Compounds of aluminium {(C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence)} · CPC title

• C09C3/12 Primary

  Treatment with organosilicon compounds {(C09C3/006 takes precedence)} · CPC title

• C09C1/0093

  whose phases only contain calcium ions, carbonate ions and silicate ions or silica · CPC title