# US 12,110,393 B2 · Crosslinkable organopolysiloxane compositions

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- Number: US 12,110,393 B2
- Document ID: US12110393B2
- Status: Granted
- Kind: B2
- Application number: 17/268,433
- Filed: 2018-08-17
- Published: 2021-11-11
- Granted: 2024-10-08
- Earliest claimed: 2018-08-17
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG
- Inventors: Detlev Ostendorf
- Web page: https://patentgrep.com/patent/US12110393B2

## CPC

- C08L 83/04: Polysiloxanes
- C08G 77/12: containing silicon bound to hydrogen
- C08G 77/18: to alkoxy or aryloxy groups
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- C08G 77/24: halogen-containing groups
- C08G 77/26: nitrogen-containing groups
- C08G 77/70: {Siloxanes defined by use of the MDTQ nomenclature}
- C08G 77/80: {Siloxanes having aromatic substituents, e.g. phenyl side groups}
- 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

## Abstract

Organopolysiloxane mixtures curable by hydrosilylation include MT organopolysiloxanes having 10 to 20 siloxy units and containing a fraction of 0.15 to 0.24 M units based on total siloxy units in the organopolysiloxane, and a polydispersity of 1.05 to 1.40, a hydrosilylation catalyst, and an Si—H-functional organopolysiloxane are curable to vulcanizates with elastic moduli which may be greater than 0.5 GPa.

## Claims

### Claim 1

A hydrosilylation-crosslinkable composition, comprising:
(A) solid organopolysiloxanes consisting of units of formulae
R2R1SiO1/2 (V),
R2SiO3/2 (VI)
and units selected from the group consisting of units of formulae
R2(OR3)SiO2/2 (VII) and
R2(OR3)2SiO1/2 (VIII),
wherein
R are identical or different and represent hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds,
R1 are monovalent hydrocarbon radicals having aliphatic carbon-carbon multiple bonds,
R2 are aromatic hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds, and
R3 are identical or different and represent hydrogen or alkyl and with the proviso that
in the organopolysiloxanes (A) the sum of the units of formula (V), based on the sum of all units of formulae (V), (VI), (VII) and (VIII), is 0.15 to 0.24,
in the organopolysiloxanes (A) the sum of the units of formulae (VII) and (VIII), based on the sum of all units of formulae (V), (VI), (VII) and (VIII), is not more than 0.08,
organopolysiloxanes (A) contain an average of 10 to 20 silicon atoms,
organopolysiloxanes (A) have a polydispersity Mw/Mn of 1.05 to 1.40 and a weight-average Mw of 1350 to 1850 g/mol and
organopolysiloxanes (A) have an average number of radicals R1 per molecule, reported in mol(R1)/mol, of 1.1 to 3.8,
(B) organosilicon compounds having two Si-bonded hydrogen atoms containing units of formula
R4eHfR5gSi (IX),
wherein
R4 are identical or different and represent monovalent, SiC-bonded, optionally substituted, saturated hydrocarbon radicals,
R5 are identical or different and represent monovalent or divalent, SiC-bonded, optionally substituted, aliphatically saturated aromatic hydrocarbon radicals,
e is 0, 1, 2 or 3,
f is 0, 1 or 2 and
g is 0, 1 or 2,
with the proviso that e+f+g=4 and two Si-bonded hydrogen atoms are present per molecule, and
(C) catalysts which promote addition of Si-bonded hydrogen onto an aliphatic multiple bond.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the organopolysiloxanes (A) are those produced by reacting
(i) organylalkoxysilanes of formulae
R2R1(OR3)Si (III)
and
R2(OR3)3Si (IV),
wherein R, R1, R2 and R3 are as defined above,
with
(ii) water in amounts of 1.0 to 10.0 mol, based on 1 mol of organylalkoxysilane (i) of formula (IV),
in the presence of
(iii) base,
in the presence of
(iv) water-miscible organic solvents.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the organosilicon compounds (B) are selected from organosilicon compounds containing units of formula (IX) having at least one radical R5.

### Claim 4 (depends on 1)

The composition of claim 1, which is a composition containing
(A) organopolysiloxanes,
(B) coupler,
(C) catalyst,
optionally (E) solvent,
(D) inhibitor,
optionally (F) reactive plasticizer, and
optionally (G) further constituents.

### Claim 5 (depends on 1)

A process for producing a composition of claim 1, comprising mixing the individual components.

### Claim 6 (depends on 5)

The process of claim 5, wherein producing the composition comprises pre-mixing component (A) with component (B) and optionally with components (D), (E), (F) and (G) to form a premixture, and this premixture is subsequently homogenized with component (C), optionally as a mixture with components (D) and (E), wherein component (A), prior to mixing with component (B), has been subjected to a further processing which lowers the content of residual (OR3) groups.

### Claim 7 (depends on 1)

A molded article produced by crosslinking a composition of claim 1.

### Claim 8 (depends on 4)

The molded article of claim 4, which has an elastic modulus measured at 23° C. of greater than 0.5 GPa.

### Claim 9 (depends on 1)

The composition of claim 1, wherein units (VII) and/or (VIII) are present, in a total amount of less than 0.08.

### Claim 10 (depends on 1)

The composition of claim 1, wherein units (VII) and/or (VIII) are present, in a total amount of from 0.01 to 0.06.

### Claim 11 (depends on 1)

The composition of claim 1, wherein the organopolysiloxanes (A) contain from 0.18 to 0.22 units of the formula (V).

### Claim 12 (depends on 1)

The composition of claim 1, wherein in the organopolysiloxanes (A), the units of the formula (V) are selected from the group consisting of siloxy groups of the formula R2R1SiO1/2 wherein R is methyl.