Siloxane resin compositions

Patent metadata

Field	Value
Publication number	US-10696846-B2
Application number	US-201616063430-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 18, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

Unique compositions containing organopolysiloxanes having both silicon-bonded hydrogen and aliphatically unsaturated groups exhibit robust processing characteristics and provide coatings or encapsulations of high transparency which can withstand numerous temperature cycles without failure.

First claim

The invention claimed is:

1. A composition, comprising:
(A) organopolysiloxanes(s) formed of 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 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding which are the same or different at each occurrence,

R 2 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties and which are the same or different at each occurrence,
R 3 represents identical or different monovalent SiC-bonded aromatic moieties,
R represents hydrogen or monovalent, optionally substituted hydrocarbyl moieties, which are optionally interrupted by heteroatoms, and which are the same or different at each occurrence,
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 a+b+c+d sum is equal to 2 in not more than 5 mol % of the units of formula (I), 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) and c is other than 0 in at least one unit, and also the ratio of Si-bonded hydrogen atoms to Si-bonded R 1 moieties in the siloxane (A) is from 0.1 to 9,
(B) organopolysiloxanes(s) formed of units of the formula
R 4 f R 5 g R 6 h (R 7 O) i SiO (4-f-g-h-i)/2   (VI),

where
R 4 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding and which are the same or different at each occurrence,
R 5 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties and which are the same or different at each occurrence,
R 6 represents identical or different monovalent SiC-bonded aromatic moieties,
R 7 represents hydrogen or monovalent, optionally substituted hydrocarbyl moieties, which are optionally interrupted by heteroatoms, and which are the same or different at each occurrence,
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 4 mol % of the units of formula (VI) and h is other than 0 in at least one unit of formula (VI),
optionally, (C) organopolysiloxanes(s) formed of 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 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, hydrocarbyl moieties with aliphatic carbon-carbon multiple bonding and which are the same or different at each occurrence,
R 9 represents monovalent, SiC-bonded, optionally halogen- or cyano-substituted, saturated hydrocarbyl moieties and which are the same or different at each occurrence,
R 10 represents identical or different monovalent SiC-bonded aromatic moieties,
R 11 represents hydrogen or monovalent, optionally substituted hydrocarbyl moieties, which are optionally interrupted by heteroatoms, and which are the same or different at each occurrence,
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 also
optionally, (D) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic carbon-carbon multiple bonds, wherein the siloxane(s) (A) comprise siloxanes having at least 3 units selected from those 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 5 mol % of the units in the siloxanes (A) conform to 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.

2. The composition of claim 1 , wherein the component (B) comprises siloxane(s) consisting of units selected from those of the formulae
R 4 f R 5 g R 6 h (R 7 O) i SiO 1/2 where ( f+g+h+i )=3  (VII),

R 5 g R 6 h (R 7 O)SiO 2/2 where ( g+h )=1  (VIIIa),

R 5 g R 6 h SiO 2/2 where ( g+h )=2  (VIIIb),

R 5 g R 6 h (R 7 O) i SiO 3/2 where ( g+h+i )=1  (IX) and

SiO 4/2   (V)

where R 4 , R 5 , R 6 , R 7 , f, g, h and i are each as defined above,
with the proviso that siloxanes (B) have at least two R 4 moieties per molecule, not more than 4 mol % of the units conform to formulae (IX) or (V) and at least one R 6 moiety is present per molecule.

3. The composition of claim 1 , which comprises from 1 to 200 parts by weight of siloxane (B), based on 100 parts by weight of component (A).

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

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

6. A shaped article of claim 5 , comprising a coating, encapsulation, or lens.

7. A process for encapsulating electrical or electronic components, comprising applying a composition of claim 1 to the component, and curing the composition by hydrosilylative crosslinking.

8. The process of claim 7 , wherein the electrical or electronic component comprises one or more LED devices.

Assignees

• Wacker Chemie Ag

Inventors

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

Classifications

• H10W74/476

  Organic materials comprising silicon · CPC title

• H10H20/854

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• C08G77/80

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

• C08G77/50

  by carbon linkages · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title