# US 11,028,268 B2 · Process for producing compositions crosslinkable to elastomers

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- Number: US 11,028,268 B2
- Document ID: US11028268B2
- Status: Granted
- Kind: B2
- Application number: 16/483,105
- Filed: 2017-02-28
- Published: 2020-07-30
- Granted: 2021-06-08
- Earliest claimed: 2017-02-28
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG
- Inventors: Torsten Sixt; Franz Neuhauser; Josef Schnitzinger
- Web page: https://patentgrep.com/patent/US11028268B2

## CPC

- C08L 83/04: Polysiloxanes
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Neutral moisture curable organopolysiloxane compositions are prepared from silanol-stopped organopolysiloxanes, alkoxysilanes, aminosilanes, and ketoximino silanes, and contain less than 1 weight percent oximes upon storage.

## Claims

### Claim 1

A process for producing moisture curable compositions crosslinkable to elastomers, comprising:
in a first step, providing a mixture comprising
(1) at least one organopolysiloxane having at least two hydroxyl groups,
(2) at least one alkoxysilane of the formula
RSi(OR1)3 (I),
and/or partial hydrolysates thereof,
where R is a monovalent hydrocarbyl radical having 1 to 18 carbon atoms, and
R1 is identical or different and is a monovalent hydrocarbyl radical having 1 to 8 carbon atoms, and
(3) organosilicon compounds having at least one radical containing basic nitrogen and bonded via carbon to silicon,
in a second step, adding to the mixture of the first step
(4) at least one ketoximosilane of the formula
R2Si(ON═CR32)3 (II)
and/or their partial hydrolysates,
where R2 is a monovalent hydrocarbyl radical having 1 to 18 carbon atoms, and
R3 is identical or different and is a monovalent hydrocarbyl radical having 1 to 5 carbon atoms, in amounts of at most 1 wt %, based on the total weight of the composition,
and optionally adding further alkoxysilanes (2) and/or their partial hydrolysates and optionally further organosilicon compounds (3) in the second step or optionally in a third step subsequent to the second step, and adding and mixing
(5) condensation catalysts,
optionally
(6) fillers,
optionally
(7) adhesion promoters,
optionally
(8) plasticizers,
optionally
(9) stabilizers, and
optionally
(10) additives different from components (1)-(9), wherein in the third step, further alkoxysilanes (2) of the formula (I) and/or their partial hydrolysates and further organosilicon compounds (3) are added to the reaction mixture from the second step.

### Claim 2 (depends on 1)

The process of claim 1, wherein in the first step, organopolysiloxanes (1), alkoxysilanes (2) of the formula (I) and/or their partial hydrolysates, organosilicon compounds (3), and optionally plasticizers (8) are mixed with one another.

### Claim 3 (depends on 1)

The process of claim 1, wherein alkoxysilanes (2) and/or their partial hydrolysates are used in a total amounts of 1 to 25 parts by weight, based on 100 parts by weight of organopolysiloxane (1).

### Claim 4 (depends on 1)

The process of claim 1, wherein alkoxysilanes (2) and/or their partial hydrolysates are used in a total amounts of 2 to 15 parts by weight, based on 100 parts by weight of organopolysiloxane (1).

### Claim 5 (depends on 1)

The process of claim 1, wherein alkoxysilanes (2) and/or their partial hydrolysates are used in the first step in an amount of 1 to 5 parts by weight, based on 100 parts by weight of organopolysiloxans (1).

### Claim 6 (depends on 1)

The process of claim 1, wherein at least one organopolysiloxane (1) has the formula
HO—[R42SiO]n—H (III),
where
R4 is identical or different and is an optionally substituted hydrocarbyl radical having 1 to 18 carbon atoms and
n is an integer from 500 to 2000.

### Claim 7 (depends on 1)

The process of claim 1, wherein at least one organosilicon compound (3) has at least one radical containing basic nitrogen and is bonded via carbon to silicon, and comprises an aminosilane of the formula
ASi(OR5)3 (IV),
where
A is a radical of the formula —R6—(NR7—R8—)xNR72,
R5 is identical or different and is a monovalent hydrocarbyl radical having 1 to 8 carbon atoms,
R6 is a divalent hydrocarbyl radical having 1 to 8 carbon atoms,
R7 is identical or different and is a hydrogen atom or a monovalent hydrocarbyl radical having 1 to 8 carbon atoms,
R8 is a divalent hydrocarbyl radical having 1 to 18 carbon atoms, and x is 0, 1, 2 or 3.

### Claim 8 (depends on 1)

The process of claim 1, wherein organosilicon compounds (3) are used in a total amount of 0.25 to 10 parts by weight, based on 100 parts by weight of the organopolysiloxanes (1).

### Claim 9 (depends on 1)

The process of claim 1, wherein organosilicon compounds (3) are used in a total amount of 1 to 7.5 parts by weight, based on 100 parts by weight of the organopolysiloxanes (1).

### Claim 10 (depends on 1)

The process of claim 1, wherein organosilicon compounds (3) are used in the first step in amounts of 0.1 to 1 part by weight, based on 100 parts by weight of organopolysiloxanes (1).

### Claim 11 (depends on 1)

The process of claim 1, wherein at least one condensation catalyst (5) is a tin catalyst.

### Claim 12 (depends on 1)

The process of claim 1, wherein additives (10) comprise at least one pigments, dyes, odorants, fungicides, oxidation inhibitors, agents for influencing the electrical properties, flame retardants, light stabilizers, heat stabilizers, thixotropic agents, and/or organic solvents.

### Claim 13 (depends on 1)

The process of claim 1, wherein fillers (6) are added to the reaction mixture from the second or optionally from the third step and then tin catalysts (5), optional adhesion promoters (7), optional stabilizers (9), and optional additives (10), when present, are subsequently added and mixed with one another.

### Claim 14 (depends on 1)

The process of claim 1, wherein adhesion promoters (7), and thereafter fillers (6) are added to the reaction mixture from the second or optionally from the third step and then tin catalysts (5), optional stabilizers (9), and optional additives (10), when present, are subsequently added and mixed with one another.