Granted Patent B2

US 12,590,185 · App. 18/026,158 · Granted Mar 31, 2026

Inventor: Riccardo Suter (Baden, CH)

Assignee: SIKA TECHNOLOGY AG

C08G77/08C08G77/18C08G2150/00C08G2170/00C08G2190/00

Abstract

Claims (49)

1 . A two-component silicone composition consisting of a component A comprising

i) at least one hydroxyl-terminated polydiorganosiloxane P;

ii) optionally at least one filler;

iii) between 0.05% and 5.0% by weight of emulsified water, based on component A;

and a component B comprising

i) at least one noncondensable polydiorganosiloxane W as plasticizer;

ii) at least one organosilane V as crosslinker;

iii at least one catalyst K for the crosslinking of polydiorganosiloxanes;

wherein

catalyst K is a tin complex of formula (V) that has two mercaptide ligands,

where ligands L 1 are each independently alkyl mercaptides coordinated via sulfur, where ligands L 1 optionally have methyldialkoxysilane groups, and ligands L 2 are each independently alkyl ligands; and

component B contains less than 5% by weight of carbon black, based on component B.

2 . The two-component silicone composition as claimed in claim 1 , wherein the hydroxyl-terminated polydiorganosiloxane P is a polydiorganosiloxane P′ of formula (I)

where

the radicals R 1 and R 2 are each independently linear or branched, monovalent hydrocarbyl radicals that have 1 to 12 carbon atoms and optionally include one or more heteroatoms, and optionally one or more C—C multiple bonds and/or optionally cycloaliphatic and/or aromatic components; and

n is chosen such that a weight-average molecular weight M w of the polydiorganosiloxane P′ relative to polystyrene is 500 to 250 000 g/mol.

3 . The two-component silicone composition as claimed in claim 2 , wherein the hydroxyl-terminated polydiorganosiloxane P′

is a polydiorganosiloxane P1 of the formula (I), where n is chosen such that the weight-average molecular weight M w of the polydiorganosiloxane P1 relative to polystyrene is 30 000 to 80 000 g/mol; or

in that the polydiorganosiloxane P′ used is a mixture of

i′) at least one hydroxyl-terminated polydiorganosiloxane P2 of the formula (I), where n is chosen such that the weight-average molecular weight M w of the polydiorganosiloxane P2 relative to polystyrene is >80 000 to 250 000 g/mol; and

ii′) at least one hydroxyl-terminated polydiorganosiloxane P3 of the formula (I), where n is chosen such that the weight-average molecular weight M w of the polydiorganosiloxane P3 relative to polystyrene is 500 to ≤30 000 g/mol;

or in that the polydiorganosiloxane P′ used is a mixture of

i″) at least one hydroxyl-terminated polydiorganosiloxane P1 of the formula (I), where n is chosen such that the weight-average molecular weight M w of the polydiorganosiloxane P1 relative to polystyrene is 30 000 to 80 000 g/mol; and

ii″) at least one hydroxyl-terminated polydiorganosiloxane P3 of the formula (I), where n is chosen such that the weight-average molecular weight M w of the polydiorganosiloxane P3 relative to polystyrene is 500 to ≤30 000 g/mol.

4 . The two-component silicone composition as claimed in claim 2 , wherein the radicals R 1 and R 2 are alkyl radicals having 1 to 5 carbon atoms.

5 . The two-component silicone composition as claimed in claim 1 , wherein organosilane V contains between 0% and 50% by weight, based on component B, of at least one first organosilane V1 of formula (I); and

Contains between 2% and 60% by weight, based on component B, of at least one second organosilane V2 of formula (II);

and contains up to 25% by weight, based on component B, of further organosilanes V3 having hydrolyzable alkoxysilane groups Si-OR a that are not covered by the formulas (I) and (II);

where R a is a hydrogen atom or an ethyl group or a methyl group;

R b is a divalent linear or branched alkyl radical or alkenyl radical having 2 to 20 carbon atoms, and

R c is a divalent linear or branched alkyl radical that has 2 to 20 carbon atoms and contains at least one secondary amino group;

with a proviso that the composition contains less than 10 mol %, based on an amount of organosilane V2, of organosilanes having epoxy groups.

6 . The two-component silicone composition as claimed in claim 5 , wherein organosilane V3 comprises at least one silane of the formula (III),

where the radical R 3 is each independently a linear or branched, monovalent hydrocarbyl radical that has 1 to 12 carbon atoms and optionally includes one or more heteroatoms, and optionally one or more C—C multiple bonds and/or optionally cycloaliphatic and/or aromatic components;

the radical R 4 is a radical R a ; and

p has a value of 0 to 4, with the proviso that, if p has a value of 3 or 4, at least p−2 radicals R 3 each have at least one group reactive with a hydroxyl groups of the polydiorganosiloxane P.

7 . The two-component silicone composition as claimed in claim 5 , wherein the organosilane V2 comprises at least one organosilane of formula (IIa),

where R d is a divalent linear or branched alkyl radical that has 2 to 10 carbon atoms and optionally contains a hydroxyl group and an ether oxygen, and

R e is a divalent linear or branched alkyl radical that has 2 to 10 carbon atoms and optionally contains a secondary amino group.

8 . The two-component silicone composition as claimed in claim 7 , wherein the organosilane V2 is either

an organosilane V2a in which the radicals R d and R e in formula (IIa) are both a divalent linear or branched alkyl radical having 2 to 10 carbon atoms; or

an organosilane V2b in which radical R e in formula (IIa) is a divalent linear or branched alkyl radical having 2 to 10 carbon atoms that optionally contains a secondary amino group, and radical R d contains a divalent linear or branched alkyl radical having 2 to 10 carbon atoms, and additionally contains one of two structural elements shown in formula (IIb);

or are a mixture of an organosilane V2a and an organosilane V2b, where the organosilanes V2a and V2b mentioned are present in component B in a weight ratio of between 1:2 and 2:1.

9 . The two-component silicone composition as claimed in claim 8 , wherein organosilane V2 comprises an organosilane V2a, organosilane V2a being present in an amount of between 5% and 20% by weight based on component B, and organosilane V2 comprises an organosilane V2b, organosilane V2b being present in an amount of between 5% and 20% by weight based on component B, and in that at least one organosilane V3 is present in an amount of between 2.5% and 20% by weight based on component B, and in that the catalyst K is present in component B in an amount of between 0.1% and 1.5% by weight based on component B.

10 . The two-component silicone composition as claimed in claim 7 , wherein organosilane V2b is a radical R e a divalent C 5 alkyl radical that has a secondary amino group in the carbon chain and radical R d is a linear divalent C 6 alkyl radical that has an ether oxygen in the carbon chain and also has a hydroxyl group.

11 . The two-component silicone composition as claimed in claim 1 , wherein, in the catalyst K of the formula (V), both ligands L′ are dodecyl mercaptide and both ligands L 2 are octyl.

12 . The two-component silicone composition as claimed in claim 1 , wherein a weight ratio of component A to component B is ≥1:1.

13 . A two-part adhesive, sealant, coating or casting compound comprising the two-component silicone composition as claimed in claim 1 .

14 . The two-part adhesive, sealant, coating or casting compound as claimed in claim 13 , configured for use in window construction or facade construction.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (11)