# US 10,870,736 B2 · Quartz-containing silicone compositions which are low in cyclic compounds

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- Number: US 10,870,736 B2
- Document ID: US10870736B2
- Status: Granted
- Kind: B2
- Application number: 15/737,373
- Filed: 2016-06-15
- Published: 2018-06-21
- Granted: 2020-12-22
- Earliest claimed: 2015-06-17
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG
- Inventors: Andreas Koellnberger
- Web page: https://patentgrep.com/patent/US10870736B2

## CPC

- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08L 83/04: Polysiloxanes
- C08J 2383/04: Polysiloxanes
- C08K 2003/2206: {of calcium, strontium or barium}
- C08K 2003/2224: {Magnesium hydroxide}
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)

## Abstract

Generation of cyclic siloxanes in silicone compositions containing quartz flour as a filer is reduced by incorporating a basic substance into the composition prior to adding filler.

## Claims

### Claim 1

A method for the production of a storage stable, quartz filler-containing, moisture-curable condensation-crosslinkable or peroxide-induced crosslinkable silicone composition containing at least one silicone component in which cyclic siloxane generation is to be reduced, comprising reducing cyclic siloxane generation by compounding 0.1-5 wt. % of a basic-reacting additive into at least a part of the silicone component, and then incorporating a quartz flour filler therein, wherein the wt. % of basic-reacting additive is based on the weight of the non-quartz ingredients of the at least one silicon component, the basic-reacting additive is selected from the group consisting of solid, particulate inorganic compounds which, measured as a saturated solution in deionized water, exhibit a pH of from 9-14, and wherein the composition, when cured, forms a solid non-foam elastomer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the basic-reacting additive comprises an inorganic compound which has a pH from 9 to 13, measured as a saturated solution in de-ionized water.

### Claim 3 (depends on 1)

The method of claim 1, wherein the basic-reacting additive is selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkaline earth metal hydroxides, alkaline earth metal carbonates, alkali phosphates, alkali hydrogen phosphates, alkaline earth metal phosphates, alkaline earth metal hydrogen phosphates, and mixtures thereof.

### Claim 4 (depends on 1)

The method of claim 1, wherein the basic-reacting additive is selected from the group consisting of Mg(OH)2, Ca(OH)2, and mixtures thereof.

### Claim 5 (depends on 1)

The method of claim 1, wherein the quartz filler-containing silicone composition is a moisture-curing, condensation-crosslinkable silicone composition.

### Claim 6 (depends on 1)

The method of claim 1, wherein the quartz filler-containing composition is a moisture-curable condensation crosslinking composition consisting of at least one organopolysiloxane with terminal silanol groups; a silane or siloxane crosslinker; a crosslinking catalyst which is an organotin or organotitanium compound or metal compound of main groups I and II of the periodic table, and mixtures thereof; and optionally, additive(s) selected from the group consisting of fillers other than quartz, fungicides, fragrances, plasticizers, rheological additives, corrosion inhibitors, oxidation inhibitors, heat and/or light stabilizers, agents for influencing electrical properties, dispersing additives, solvents, adhesion promoters, pigments, dyes, organic polymers, and mixtures thereof.

### Claim 7 (depends on 1)

The method of claim 1, wherein the quartz filler-containing composition is a peroxide-induced crosslinkable composition consisting of at least one organopolysiloxane having at least two aliphatically unsaturated groups, an organic peroxide, and optionally an additive selected from the group consisting of fillers other than quartz, fungicides, fragrances, plasticizers, rheological additives, corrosion inhibitors, oxidation inhibitors, heat and/or light stabilizers, agents for influencing electrical properties, dispersing additives, solvents, adhesion promoters, pigments, dyes, organic polymers, and mixtures thereof.