Siloxane resin compositions

Patent metadata

Field	Value
Publication number	US-10655014-B2
Application number	US-201616063411-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 18, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

Addition curable silicone resin compositions have excellent processing characteristics, and can be used to encapsulate electrical and electronic devices.

First claim

The invention claimed is:

1. A compositions comprising:
(A) at least one organopolysiloxane comprising at least 3 units of the formula
R 1 a R 2 b R 3 c H d (RO) e SiO (4-a-b-c-d-e)/2   (I),

where
R 1 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding,
R 2 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties,
R 3 each independently are monovalent SiC-bonded aromatic moieties,
R each independently are hydrogen or monovalent, optionally substituted hydrocarbyl moieties which are optionally interrupted by heteroatoms,
a is 0, 1, 2 or 3,
b is 0, 1, 2 or 3,
c is 0, 1, 2 or 3,
d is 0, 1 or 2, and
e is 0, 1 or 2,

with the proviso that the a+b+c+d+e sum is not more than 3, the sum total of Si-bonded hydrogen atoms and R 1 moieties per molecule is at least 3, the a+b+c+d sum is equal to 0 or 1 in at least 10 mol % of the units of formula (I), c is other than 0 in at least one unit, and the ratio of Si-bonded hydrogen atoms to Si-bonded R 1 moieties in the siloxane (A) is from 0.1 to 9,
optionally (B) organopolysiloxanes comprising units of the formula
R 4 f R 5 g R 6 h (R 7 O) t SiO (4-f-g-h-i)/2   (VI),

where
R 4 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted, hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding,
R 5 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties,
R 6 each independently are monovalent SiC-bonded aromatic moieties,
R 7 each independently are hydrogen or monovalent, optionally substituted hydrocarbyl moieties, which are optionally interrupted by heteroatoms,
f is 0, 1, 2 or 3,
g is 0, 1, 2 or 3,
h is 0, 1 or 2,
i is 0 or 1,

with the proviso that the f+g+h+i sum is not more than 3, siloxanes (B) have at least two R 4 moieties per molecule, the f+g+h+i sum is equal to 0 or 1 in not more than 20 mol % of the units of formula (VI) and h is other than 0 in at least one unit of formula (VI),
(C) at least one organopolysiloxane comprising units of the formula
R 8 k R 9 l R 10 m (R 11 O) n SiO (4-k-l-m-n)/2   (X),

where
R 8 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted, hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding,
R 9 each independently are monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties,
R 10 each independently are monovalent SiC-bonded aromatic moieties,
R 11 each independently are hydrogen or monovalent, optionally substituted hydrocarbyl moieties, which are optionally interrupted by heteroatoms,
k is 0, 1, 2 or 3,
l is 0, 1, 2 or 3,
m is 0, 1 or 2, and
n is 0 or 1,

with the proviso that the k+l+m+n sum is not more than 3, siloxanes (C) have at least two R 8 moieties per molecule, the k+l+m+n sum is equal to 0 or 1 in at least 10 mol % of the units of formula (X) and m is other than 0 in at least one unit of formula (X),
and
optionally, (D) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic carbon-carbon multiple bonds.

2. The composition of claim 1 , wherein siloxane(s) (A) comprise siloxanes having at least 3 units selected from the group consisting of the formulae
R 1 a R 2 b R 3 c H d (RO) e SiO 1/2 where ( a+b+c+d+e )=3  (II),

R 2 b R 3 c (RO)SiO 2/2 where ( b+c )=1  (IIIa),

R 2 b R 3 c SiO 2/2 where ( b+c )=2  (IIIb),

R 2 b R 3 c (RO) e SiO 3/2 where ( b+c+e )=1  (IV), and

SiO 4/2   (V),

where R, R 1 , R 2 , R 3 , a, b, c, d and e are each as defined above,
with the proviso that not more than 25 mol % of the units in the siloxanes (A) are of formula (IIIb), the sum total of Si-bonded hydrogen atoms and R 1 moieties per molecule is at least 3, at least one R 3 moiety is present per molecule, and at least one unit of formula (IV) and/or (V) is present.

3. The composition of claim 1 , wherein component (C) comprises siloxanes consisting of units selected from the group consisting of:
R 8 k R 9 l R 10 m (R 11 O) n SiO 1/2 where ( k+l+m+n )=3  (XI),

R 9 l R 10 m (R 11 O)SiO 2/2 where ( l+m )=1  (XIIa),

R 9 l R 10 m SiO 2/2 where ( l+m )=2  (XIIb),

R 9 l R 10 m (R 11 O) n SiO 3/2 where ( l+m+n )=1  (XIII), and

SiO 4/2   (V)

where R 8 , R 9 , R 10 , R 11 , k, l, m and n are each as defined above,
with the proviso that siloxanes (C) have at least two R 8 moieties per molecule, at least one R 10 moiety is present per molecule, and at least one unit of formula (XIII) and/or (V) is present.

4. The composition of claim 2 , wherein component (C) comprises siloxanes consisting of units selected from the group consisting of:
R 8 k R 9 l R 10 m (R 11 O) n SiO 1/2 where ( k+l+m+n )=3  (XI),

R 9 l R 10 m (R 11 O)SiO 2/2 where ( l+m )=1  (XIIa),

R 9 l R 10 m SiO 2/2 where ( l+m )=2  (XIIb),

R 9 l R 10 m (R 11 O) n SiO 3/2 where ( l+m+n )=1  (XIII), and

SiO 4/2   (V)

where R 8 , R 9 , R 10 , R 11 , k, l, m and n are each as defined above,
with the proviso that siloxanes (C) have at least two R 8 moieties per molecule, at least one R 10 moiety is present per molecule, and at least one unit of formula (XIII) and/or (V) is present.

5. The composition of claim 1 , comprising from 1 to 200 parts by weight of siloxane (C), based on 100 parts by weight of component (A).

6. The composition of claim 2 , comprising from 1 to 200 parts by weight of siloxane (C), based on 100 parts by weight of component (A).

7. The composition of claim 3 , comprising from 1 to 200 parts by weight of siloxane (C), based on 100 parts by weight of component (A).

8. The composition of claim 1 , comprising:
(A) siloxanes comprising units of formula (I), optionally (B) siloxanes comprising units of formula (VI),
(C) siloxanes comprising units of formula (X),
(D) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic carbon-carbon multiple bonds,
optionally (E) fillers,
optionally (F) adhesion promoters,
optionally (G) inhibitors,
optionally (H) plasticizers,
optionally (K) additives, and
optionally (L) solvents.

9. The composition of claim 1 , comprising:
(A) siloxanes comprising units of formula (I),
optionally (B) siloxanes comprising units of formula (VI),
(C) siloxanes comprising units of formula (X),
(D) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic carbon-carbon multiple bonds,
optionally (E) fillers,
(F) adhesion promoters,
optionally (G) inhibitors,
optionally (H) plasticizers,
optionally (K) additives, and
optionally (L) solvents.

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

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

12. The shaped article of claim 11 , which is a coating, encapsulation, or lens.

13. In a process for encapsulation of electrical or electronic components, the improvement comprising encapsulating with a composition of claim 1 .

14. In a process for the manufacture of devices containing LEDs, the improvement comprising encapsulating at least one LED with a composition of claim 1 .

Assignees

• Wacker Chemie Ag

Inventors

• Kuhn Arvid
• Joo Young-Hyuk
• Sandmeyer Frank
• Yang Hyun-Kwan

Classifications

• C08G77/18

  to alkoxy or aryloxy groups · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08L83/00

  Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers · CPC title

• C08L83/04 Primary

  Polysiloxanes · CPC title

• C08G77/80

  Siloxanes having aromatic substituents, e.g. phenyl side groups · CPC title