Cross-linkable masses based on organyl-oxysilane-terminated polymers

Patent metadata

Field	Value
Publication number	US-10030183-B2
Application number	US-201515304338-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	Apr 17, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

RTV-1 compositions, despite containing conventional alkoxysilyl-terminated polymers, exhibit rapid cure and excellent physical properties when they further contain silicone resins, and employ metal, amidine, or guanidine curing catalysts C1 and amine-containing cocatalysts C2 in specific mole ratios.

First claim

The invention claimed is:

1. A crosslinkable composition, comprising:
(A) 100 parts by weight of compound(s) of the formula
Y—[(CR 1 2 ) 3 —SiR a (OR 2 ) 3-a ] b   (I),

where
Y is a b-valent polymer radical bonded via a nitrogen, oxygen, sulfur or carbon atom contained in the b-valent polymer radical to a carbon of (CR 1 2 ) 3 ,
R are identical or different monovalent, optionally substituted hydrocarbon radicals,
R 1 are identical or different and are hydrogen or a monovalent optionally substituted hydrocarbon radical, which may be attached via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group to the carbon atom of CR 1 2 ,
R 2 are identical or different and are hydrogen or a monovalent, optionally substituted hydrocarbon radical,
b is an integer from 1 to 10, and
a is 0, 1 or 2,
(B) at least 5 parts by weight of one or more silicone resins comprising units of the formula
R 3 c (R 4 O) d R 5 e SiO (4-c-d-e)/2   (II),

where
R 3 are identical or different and are hydrogen, monovalent, SiC-bonded, optionally substituted aliphatic hydrocarbon radicals, or divalent, optionally substituted, aliphatic hydrocarbon radicals which bridge two units of the formula (II),
R 4 are identical or different and are hydrogen or a monovalent, optionally substituted hydrocarbon radical,
R 5 are identical or different and are monovalent, SiC-bonded, optionally substituted aromatic hydrocarbon radicals,
c is 0, 1, 2 or 3,
d is 0, 1, 2 or 3, and
e is 0, 1 or 2,
with the proviso that
the sum of c+d+e is less than or equal to 3 and in at least 40% of the units of the formula (II) the sum c+e is 0 or 1,
(C1) at least one metal-containing curing catalyst, guanidine catalyst, or amidine catalyst, and
(C2) at least one cocatalyst comprising units of the formula
D h Si(OR 7 ) g R 6 f O (4-f-g-h)/2   (III),

in which
R 6 are identical or different and are a monovalent, optionally substituted SiC-bonded, nitrogen-free organic radicals,
R 7 are identical or different and are hydrogen or an optionally substituted hydrocarbon radical,
D are identical or different monovalent, SiC-bonded radical having at least one nitrogen atom not bonded to a carbonyl group (C═O),
f is 0, 1, 2 or 3,
g is 0, 1, 2 or 3, and
h is 0, 1, 2, 3 or 4,
with the proviso that the sum of f+g+h is less than or equal to 4 and per molecule there is at least one radical D present,
where the molar ratio of compounds (C1) to radicals D in compounds (C2) is 1:1 to 1:400 and the crosslinkable composition comprises components (C1) and (C2) in a total amount of 0.2 to 50 parts by weight per 100 parts by weight of component (A), and also
(E) calcium carbonate, aluminum trihydroxide and/or talc in amounts of in total 10 to 500 parts by weight.

2. The crosslinkable composition of claim 1 , wherein radical Y comprises polyurethane radicals or polyoxyalkylene radicals.

3. The crosslinkable composition of claim 1 , wherein component (B) comprises silicone resins (B1) which, based on the total number of units of the formula (II), have at least 20% of units of the formula (II) in which e is 1.

4. The crosslinkable composition of claim 1 , wherein plasticizer(s) (D) are present in amounts of 5 to 300 parts by weight per 100 parts by weight of component (A).

5. The crosslinkable composition of claim 1 , wherein catalyst(s) (C1) are tin-containing compounds.

6. The crosslinkable composition of claim 1 , wherein the molar ratio of the compound(s) (C1) to radicals D in compound (C2) is 1:2 to 1:200.

7. The crosslinkable composition of claim 1 , wherein the composition comprises:
(A) 100 parts by weight of compound(s) of the formula (I),
(B) 5-60 parts by weight of silicone resin(s) consisting of units of the formula (II),
(C1) catalyst(s) selected from metal-containing curing catalysts, guanidines, and/or amidines,
(C2) cocatalyst(s) consisting of units of the formula (III),
with the proviso that the molar ratio of compounds (C1) to radicals D in compounds (C2) is 1:2 to 1:200 and the crosslinkable composition comprises components (C1) and (C2) in a total amount of 0.3 to 35 parts by weight per 100 parts by weight of component (A),
(D) 5 to 300 parts by weight of plasticizers,
(E) calcium carbonate, aluminum hydroxide and/or talc in amounts of in total 10 to 500 parts by weight,
(F) optionally, adhesion promoters,
(G) optionally, water scavengers,
(H) optionally, additives, and
(I) optionally, adjuvants.

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

9. A shaped article produced by crosslinking a composition of claim 1 .

10. A process for producing a composite material, comprising applying a composition of claim 1 to at least one substrate and crosslinking the composition.

11. The composition of claim 1 , wherein b is 1, 2, or 3.

12. The composition of claim 1 , wherein b is 1 or 2.

13. The composition of claim 1 , wherein d is 0 or 1.

14. The composition of claim 1 , wherein e is 0, or 1.

Assignees

• Wacker Chemie Ag

Inventors

• Stanjek Volker
• Zander Lars

Classifications

• C09J183/10

  Block or graft copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09J151/08, C09J153/00) · CPC title

• C08G77/458

  containing polyurethane sequences · CPC title

• C08K3/26

  Carbonates; Bicarbonates · CPC title

• C09J183/12 Primary

  containing polyether sequences · CPC title

• C08G77/26 Primary

  nitrogen-containing groups · CPC title