Compositions on the basis of organyloxysilane-terminated polymers

Patent metadata

Field	Value
Publication number	US-10077386-B2
Application number	US-201715417396-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Feb 6, 2012
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

Moisture-curing adhesives simultaneously having high tensile strength and elongation are prepared by admixing a silane-terminated polyurethane or polyether polymer having a defined and limited molecular weight, finely divided silica, and an organosilicon compound containing basic nitrogen.

First claim

What is claimed is:

1. A composition, comprising:
(A) at least one silane-crosslinking polymer of the formula
Y—[(CR 1 2 ) b —SiR a (OR 2 ) 3-a ] x   (I)

where
Y comprises a polyurethane or polyoxyalkylene polymer residue which is x-valent and attached to (CR 1 2 ) via nitrogen, oxygen, sulfur or carbon,
R each independently is a monovalent, optionally substituted hydrocarbyl radical,
R 1 each independently is hydrogen or a monovalent, optionally substituted hydrocarbyl radical optionally attached to the carbon atom of the CR 1 2 group via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group,
R 2 each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
x is an integer from 1 to 10,
a each individually is 0, 1 or 2, and
b each individually is an integer from 1 to 10,
(B) finely divided silica comprising pyrogenic silica having a BET surface area of between 50 m 2 /g to 200 m 2 /g, and
(D) at least one basic nitrogen organosilicon compound comprising units of the formula
D c Si(OR 3 ) d R 4 e O (4-c-d-e)/2   (V),

where
R 3 each individually is hydrogen or an optionally substituted hydrocarbyl radical,
D each individually is a monovalent SiC-bonded radical with basic nitrogen,
R 4 each individually is a monovalent, optionally substituted SiC-bonded organic radical free from basic nitrogen,
c is 0, 1, 2, 3 or 4,
d is 0, 1, 2 or 3, and
e is 0, 1, 2 or 3,

with the proviso that the sum total of c+d+e is not more than 4 and at least one D radical is present per molecule, and with the further proviso that silane-crosslinking polymer(s) (A) have an average molar mass M n (number average) of at least 8000 g/mol and at most 30,000 g/mol, the composition comprises finely divided silica in an amount of 16 to 50 wt %, based on the overall weight of the composition, and which when cured exhibits a tensile strength >5 MPa and an elongation at break, with the additional proviso that carbon black is excluded from the composition >100%.

2. The composition of claim 1 , wherein c is 1.

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

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

5. The composition of claim 1 , comprising finely divided silica (B) in a concentration of at least 19 wt % and at most 40 wt %, based on the overall weight of composition.

6. The composition of claim 1 , wherein the finely divided pyrogenic silica has a BET surface area of from greater than 50 m 2 /g to about 140 m 2 /g.

7. The composition of claim 1 , further comprising at least one nonreactive plasticizer.

8. The composition of claim 7 , wherein the plasticizer is present in a concentration of at least 5 wt % and at most 50 wt %, based on the overall weight of composition.

9. A method of forming a composition of claim 1 , comprising mixing the individual components in any desired order.

10. A shaped article obtained by crosslinking a composition of claim 1 .

11. A method of adhesively bonding substrates, comprising applying a composition of claim 1 onto the surface of at least one substrate, and then contacting this surface with a second substrate, and subsequently allowing the composition to crosslink.

12. A method of forming composites, which comprises applying a composition of claim 1 onto at least one substrate and then allowing the composition to crosslink.

13. A method of forming a composite, comprising applying a composition prepared by the method of claim 9 onto at least one substrate and crosslinking the composition.

14. The composition of claim 1 , wherein b is 1, and the composition is free of metal catalysts.

15. The composition of claim 1 , further comprising a polyoxyalkylene polyether plasticizer.

16. The composition of claim 7 , wherein the plasticizer is present in an amount of from 10 to 40 weight percent based on the total weight of the composition, and the composition, when cured, exhibits properties of tensile strengh, elongation, or both tensile strength and elongation higher than the property or properties of a composition which is identical except for containing no plasticizer.

17. The composition of claim 1 , further comprising at least one silicone resin, the silicone resin being present in an amount of from 5 to 1000 parts by weight relative to 100 parts by weight of component A.

18. A composition, comprising:
(A) optionally, at least one silane-crosslinking polymer of the formula
Y—[(CR 1 2 ) b —SiR a (OR 2 ) 3-a ] x   (I)

where
Y comprises a polyurethane or polyoxyalkylene polymer residue which is x-valent and attached to (CR 1 2 ) via nitrogen, oxygen, sulfur or carbon,
R each independently is a monovalent, optionally substituted hydrocarbyl radical,
R 1 each independently is hydrogen or a monovalent, optionally substituted hydrocarbyl radical optionally attached to the carbon atom of the CR 1 2 group via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group,
R 2 each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
x is an integer from 1 to 10,
a each individually is 0, 1 or 2, and
b each individually is an integer from 1 to 10,

at least one silane-crosslinking polymer of the formula
Y—[CR 1 2 —SiR a (OR 2 ) 3-a ] x   (Ia),

where
Y comprises a polyurethane or polyoxyalkylene polymer residue which is x-valent and attached to (CR 1 2 ) via nitrogen, oxygen, sulfur or carbon,
R each independently is a monovalent, optionally substituted hydrocarbyl radical,
R 1 each independently is hydrogen or a monovalent, optionally substituted hydrocarbyl radical optionally attached to the carbon atom of the CR 1 2 group via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group,
R 2 each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
x is an integer from 1 to 10,
a each individually is 0, 1 or 2, and
b each individually is an integer from 2 to 10,
(B) finely divided silica comprising pyrogenic silica having a BET surface area of between 50 m 2 /g to 200 m 2 /g, and
(D) at least one basic nitrogen organosilicon compound comprising units of the formula
D c Si(OR 3 ) d R 4 e O (4-c-d-e)/2   (V),

where
R 3 each individually is hydrogen or an optionally substituted hydrocarbyl radical,
D each individually is a monovalent SiC-bonded radical with basic nitrogen,
R 4 each individually is a monovalent, optionally substituted SiC-bonded organic radical free from basic nitrogen,
c is 0, 1, 2, 3 or 4,
d is 0, 1, 2 or 3, and
e is 0, 1, 2 or 3,

with the proviso that the sum total of c+d+e is not more than 4 and at least one D radical is present per molecule, and with the further proviso that silane-crosslinking polymer(s) (A) have an average molar mass M n (number average) of at least 8000 g/mol and at most 30,000 g/mol, the composition comprises finely divided silica in an amount of 16 to 50 wt %, based on the overall weight of the composition, and the composition, when cured, has an elongation >100% with the additional proviso that carbon black is excluded from the composition.

19. The composition of claim 18 wherein no silane-crosslinking polymer of formula I is present.

20. The composition of claim 18 , wherein silane crosslinking polymers of the formulae I and Ia are both present, in a weight ratio of Ia:I of 0.1 to 10.

21. The composition of claim 18 , which when cured exhibits a tensile strength >5 Mpa.

Assignees

• Wacker Chemie Ag

Inventors

• Stanjek Volker
• Prasse Marko
• Zander Lars

Classifications

• C08G65/48

  Polymers modified by chemical after-treatment · CPC title

• C09J5/00

  Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers · CPC title

• C08K5/0016

  Plasticisers · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C09J2471/00

  Presence of polyether · CPC title