US 10,894,883 B2Granted

Curable polyorganosiloxane composition and use thereof

AssigneeMomentive Performance Materials Japan LLC

InventorsYasuhito Morita, Koji Okawa, Takeshi Sunaga

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Abstract

The present invention is an addition reaction type polyorganosiloxane composition which can be cured rapidly at room temperature. A cured product of the composition exhibits high elongation, excellent stress relaxation properties and good reliability under conditions of high temperature and high humidity and exhibits excellent reliability in cold/heat cycling. The composition contains: (A1) a straight chain polysiloxane containing alkenyl groups at both terminals; (B1) a straight chain polysiloxane containing SiH groups at both terminals; (B2) a crosslinkable polyorganohydrogensiloxane; one or more types selected from the group consisting of (A2) a straight chain polysiloxane containing an alkenyl group at one terminal and (B3) a straight chain polysiloxane containing a SiH group at one terminal; and (C) a platinum-based catalyst. The content of component A2 is 0-60 parts by weight relative to a total of 100 parts by weight of components A1 and A2, and the value of (HB1+HB2+HB3)/(ViA1+ViA2) (in the formula, ViA1, ViA2, HB1, HB2 and HB3 are as disclosed in the description) is 0.6-2.2.

Claims19

Dependent claims

A curable polyorganosiloxane composition comprising:

(A1) an alkenyl group-containing polyorganosiloxane represented by the following formula (I):
wherein:
each Ra1 is independently a C2-C6 alkenyl group,
each Rb1 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n1 is a value such that the viscosity of the component (A1) at 23° C. is 10 to 1,000,000 m·Pas;
(B1) a polyorganohydrogensiloxane represented by the following formula (II):
wherein:
each Rc1 is a hydrogen atom,
each Rb2 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n2 is a value such that the viscosity of the component (B1) at 23° C. is 0.1 to 300 m·Pas;
(B2) a polyorganohydrogensiloxane comprising a Rb32Rc2SiO1/2 unit (wherein each Rb3 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and Rc2 is a hydrogen atom) and a SiO4/2 unit, and having three or more hydrogen atoms bonded to silicon atoms per molecule;
at least one member selected from the group consisting of (A2) an alkenyl group-containing polyorganosiloxane represented by the following formula (III):
wherein:
each Ra2 is independently a C2-C6 alkenyl group,
each Rb4 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n3 is a value such that the viscosity of the component (A2) at 23° C. is 10 to 1,000,000 mPa·s,
and
(B3) a linear polyorganohydrogensiloxane represented by the following formula (IV):
wherein:
Rc3 is a hydrogen atom,
each Rb5 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n4 is a value such that the viscosity of the component (B3) at 23° C. is 0.1 to 300 mPa·s;
and
(C) a platinum-based catalyst,
wherein the amount of the component (A2) is 0 to 60 parts by weight, relative to 100 parts by weight of the total of the components (A1) and (A2), and the value of (HB1+HB2+HB3)/(ViA1+ViA2) is 0.6 to 2.2, wherein Vim is the molar number of the alkenyl groups of the component (A1), ViA2 is the molar number of the alkenyl groups of the component (A2), HB1 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B1), HB2 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B2), and HB3 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B3), and
wherein the component (B2) is a cyclic polyorganohydrogensiloxane having a cyclic siloxane skeleton formed from 3 to 5 SiO4/2 units, in which two Rb32Rc2SiO1/2 units are bonded to each SiO4/2 unit.

23 more elements

A curable polyorganosiloxane composition comprising:

(A1) an alkenyl group-containing polyorganosiloxane represented by the following formula (I):
wherein:
each Ra1 is independently a C2-C6 alkenyl group,
each Rb1 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n1 is a value such that the viscosity of the component (A1) at 23° C. is 10 to 1,000,000 mPa·s;
(B1) a polyorganohydrogensiloxane represented by the following formula (II):
wherein:
each Rc1 is a hydrogen atom,
each Rb2 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n2 is a value such that the viscosity of the component (B1) at 23° C. is 0.1 to 300 mPa·s;
(B2) a polyorganohydrogensiloxane comprising a Rb32Rc2SiO1/2 unit (wherein each Rb3 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and Rc2 is a hydrogen atom) and a SiO4/2 unit, and having three or more hydrogen atoms bonded to silicon atoms per molecule;
at least one member selected from the group consisting of (A2) an alkenyl group-containing polyorganosiloxane represented by the following formula (III):
wherein:
each Ra2 is independently a C2-C6 alkenyl group,
each Rb4 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n3 is a value such that the viscosity of the component (A2) at 23° C. is 10 to 1,000,000 mPa·s,
and
(B3) a linear polyorganohydrogensiloxane represented by the following formula (IV):
wherein:
Rb3 is a hydrogen atom,
each Rb5 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and n4 is a value such that the viscosity of the component (B3) at 23° C. is 0.1 to 300 mPa·s;
and
(C) a platinum-based catalyst,
wherein the amount of the component (A2) is 0 to 60 parts by weight, relative to 100 parts by weight of the total of the components (A1) and (A2), and the value of (HB1+HB2+HB3)/(ViA1+ViA2) is 0.6 to 2.2, wherein Vim is the molar number of the alkenyl groups of the component (A1), ViA2 is the molar number of the alkenyl groups of the component (A2), HB1 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B1), HB2 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B2), and HB3 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B3),
wherein the curable polyorganosiloxane composition contains the component (A2), wherein the value of (HB1+HB2)/(ViA1+ViA2) is 0.6 to 2.2, and
wherein the amount of the component (A2) is 5 to 37 parts by weight, relative to 100 parts by weight of the total of the components (A1) and (A2), the value of (HB1+HB2)/(ViA1+ViA2) is 0.6 to 0.99, and the value of HB1/(HB1+HB2) is 0.3 to 0.8.

23 more elements

A curable polyorganosiloxane composition comprising:

(A1) an alkenyl group-containing polyorganosiloxane represented by the following formula (I):
wherein:
each Ra1 is independently a C2-C6 alkenyl group,
each Rb1 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and n1 is a value such that the viscosity of the component (A1) at 23° C. is 10 to 1,000,000 mPa·s;
(B1) a polyorganohydrogensiloxane represented by the following formula (II):
wherein:
each Rc1 is a hydrogen atom,
each Rb2 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n2 is a value such that the viscosity of the component (B1) at 23° C. is 0.1 to 300 mPa·s;
(B2) a polyorganohydrogensiloxane comprising a Rb32Rc2SiO1/2 unit (wherein each Rb3 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and Rc2 is a hydrogen atom) and a SiO4/2 unit, and having three or more hydrogen atoms bonded to silicon atoms per molecule;
at least one member selected from the group consisting of (A2) an alkenyl group-containing polyorganosiloxane represented by the following formula (III):
wherein:
each Ra2 is independently a C2-C6 alkenyl group,
each Rb4 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n3 is a value such that the viscosity of the component (A2) at 23° C. is 10 to 1,000,000 mPa·s,
and
(B3) a linear polyorganohydrogensiloxane represented by the following formula (IV):
wherein:
Rb3 is a hydrogen atom,
each Rb5 is independently a C1-C6 alkyl group or a C6-C20 aryl group, and
n4 is a value such that the viscosity of the component (B3) at 23° C. is 0.1 to 300 mPa·s;
and
(C) a platinum-based catalyst,
wherein the amount of the component (A2) is 0 to 60 parts by weight, relative to 100 parts by weight of the total of the components (A1) and (A2), and the value of (HB1+HB2+HB3)/(ViA1+ViA2) is 0.6 to 2.2, wherein Vim is the molar number of the alkenyl groups of the component (A1), ViA2 is the molar number of the alkenyl groups of the component (A2), HB1 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B1), HB2 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B2), and HB3 is the molar number of the hydrogen atoms bonded to the silicon atoms of the component (B3), and
wherein the curable polyorganosiloxane composition contains the component (B3), wherein the value of (HB1+HB2+HB3)/ViA1 is 0.6 to 2.5.

22 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/310,371Filed 15 Jun 2017
Priority: JP 2016-11883815 Jun 2016
Published: US 2019/0153227 A123 May 2019
Granted: 19 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C08L 83/04
Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with…
C08G 77/045
Polysiloxanes: containing less than 25 silicon atoms
G02F 1/133308
Constructional arrangements; Manufacturing methods: support structures for LCD panels, e.g. frames or bezels
G09F 9/00
Indicating arrangements for variable information in which the information is built-up on