# US 7,745,531 B2 · Crosslinkable compositions based on organosilicon compounds

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- Number: US 7,745,531 B2
- Document ID: US7745531B2
- Status: Granted
- Kind: B2
- Application number: 11/755,103
- Filed: 2007-05-30
- Published: 2007-12-06
- Granted: 2010-06-29
- Earliest claimed: 2006-06-06
- Assignees: Wacker Chemie AG
- Inventors: Peter Schoeley; Gabriele Dineiger; Uwe Scheim
- Web page: https://patentgrep.com/patent/US7745531B2

## CPC

- C08K 3/26: Carbonates; Bicarbonates
- C08L 83/04: Polysiloxanes
- C08G 77/04: Polysiloxanes
- C08G 77/16: to hydroxy groups
- C08G 77/18: to alkoxy or aryloxy groups
- Y10T 428/31663: As siloxane, silicone or silane
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Crosslinkable compositions based on organosilicon compounds with a very high storage stability contain fine-particle metacarbonate. Storage stability of the composition is increased as compared to conventional forms of carbonates.

## Claims

### Claim 1

A crosslinkable, storage stable, moisture-curable RTV-1 organopolysiloxane composition, comprising
(A) at least one organosilicon compound of the formula
Y3-fRfSi—(SiR2O)e—SiRfY3-f (II)
where
R each are identical or different unsubstituted or substituted hydrocarbon radicals which are optionally interrupted by non-adjacent oxygen atoms,
Y each are identical or different and are a hydrolyzable radical —OR,
e is from 30 to 5000, and
f is 0, 1, or 2,
(B) a calcium carbonate filler consisting of fine-particle metacarbonate, and
(C) one or more crosslinking agents, wherein the storage stability of the storage stable composition is higher than an otherwise similar composition wherein the calcium carbonate filler is not calcium metacarbonate.

### Claim 2 (depends on 1)

The crosslinkable composition of claim 1, wherein R in the group —OR is methyl.

### Claim 3 (depends on 1)

The crosslinkable composition of claim 1, wherein the one or more crosslinking agents (C) are selected from the group consisting of tetramethoxysilane, methyltrimethoxysilane, and vinyltrimethoxysilane.

### Claim 4 (depends on 1)

The crosslinkable composition of claim 1, wherein R in the group —OR is methyl or ethyl.

### Claim 5 (depends on 4)

A molding, produced via crosslinking of a composition of claim 4.

### Claim 6 (depends on 1)

The crosslinkable composition of claim 1, wherein component (B) is fine-particle metacarbonate whose average particle diameter is from 0.1 to 30 μm.

### Claim 7 (depends on 6)

A molding, produced via crosslinking of a composition of claim 6.

### Claim 8 (depends on 1)

The crosslinkable composition of claim 1, wherein the calcium carbonate content of component (B) is at least 90% by weight.

### Claim 9 (depends on 8)

A molding, produced via crosslinking of a composition of claim 8.

### Claim 10 (depends on 1)

The crosslinkable composition of claim 1, wherein the specific surface area of component (B) is at most 15 m2/g.

### Claim 11 (depends on 10)

A molding, produced via crosslinking of a composition of claim 10.

### Claim 12 (depends on 1)

The crosslinkable composition of claim 1, wherein the oil absorption value (ISO 787/5) of component (B) is more than 1 g/100 g.

### Claim 13 (depends on 12)

A molding, produced via crosslinking of a composition of claim 12.

### Claim 14 (depends on 1)

The crosslinkable composition of claim 1, wherein the amount of component (B) is from 1 to 500 parts by weight, based on 100 parts by weight of organosilicon compound (A).

### Claim 15 (depends on 14)

A molding, produced via crosslinking of a composition of claim 14.

### Claim 16 (depends on 3)

A molding, produced via crosslinking of a composition of claim 3.

### Claim 17 (depends on 1)

A molding, produced via crosslinking of a composition of claim 1.

### Claim 18 (depends on 1)

The RTV-1 composition of claim 1, wherein the total filler consists of fine particle metacarbonate and one or more fillers selected from the group consisting of diatomaceous earth, calcium silicate, zirconium silicate, zeolites, metal aluminum oxides, titanium oxides, iron oxides, zinc oxides, barium sulfate, gypsum, silicon nitride, silicon carbide, boron nitride, glass powder, plastic powders, fumed silica, precipitated silica, carbon black, and silicon-aluminum mixed oxides.

### Claim 19 (depends on 1)

The RTV-1 composition of claim 1, wherein the filler consists of fine calcium metacarbonate and silica.

### Claim 20 (depends on 1)

The composition of claim 1, wherein the calcium metacarbonate is not surface treated.