UV-Curable Silicone Composition, Cured Products Thereof, And Methods Of Using The Same

Patent metadata

Field	Value
Publication number	US-2016244625-A1
Application number	US-201415027076-A
Country	US
Kind code	A1
Filing date	Oct 22, 2014
Priority date	Nov 11, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

Various embodiments disclosed related to UV-curable silicone composition, cured products thereof, and methods of using the same. Various embodiments provide a shear-thinning UV-curable silicone composition. The composition can include (A) a mercapto-functional polyorganosiloxane having the unit formula [(CH 3 ) 3 SiO 1/2 ] x [(CH 3 ) 2 SiO] y [R(CH 3 )SiO] z wherein x is about 0.01 to about 0.1, y is about 0 to about 0.94, z is about 0.05 to about 0.99, and at each occurrence R is independently a mercapto(C 1-30 )hydrocarbyl group. The composition can include (B) at least one of (B1) a polyorganosiloxane comprising at least two aliphatic unsaturated carbon-carbon bonds, and (B2) an organic molecule comprising at least two aliphatic unsaturated carbon-carbon bonds; the composition can include (C) a filler. The composition can also include (D) a photoinitiator.

First claim

1 : A composition comprising:
(A) a mercapto-functional polyorganosiloxane having the unit formula
[(CH 3 ) 3 SiO 1/2 ] x [(CH 3 ) 2 SiO] y [R(CH 3 )SiO] z
wherein x is about 0.01 to about 0.1, y is about 0 to about 0.94, z is about 0.05 to about 0.99, and at each occurrence R is independently a mercapto(C 1-30 )hydrocarbyl group;
(B) at least one of
(B1) a polyorganosiloxane comprising at least two aliphatic unsaturated carbon-carbon bonds, and
(B2) an organic molecule comprising at least two aliphatic unsaturated carbon-carbon bonds;
(C) a filler; and (D) a photoinitiator; wherein the composition is shear-thinning and UV-curable.

2 : The curable silicone composition of claim 1 , wherein the filler is at least one of silica powder and ceramic glass powder.

3 : The curable silicone composition of claim 1 , wherein the filler (C) is fumed silica.

4 : The curable silicone composition of claim 1 , wherein the filler is substantially transparent to light having a wavelength of about 280 nm to about 400 nm.

5 : The curable silicone composition of claim 1 , wherein the curable silicone composition is substantially optically clear.

6 : The curable silicone composition of claim 1 , wherein the viscosity of the composition decreases as the shear rate increases.

7 : A method of making the curable silicone composition of claim 1 , the method comprising
obtaining or providing Part I, comprising a substantially viscosity-stable pre-mix comprising the components (A), (C), and (D); obtaining or providing Part II, comprising component (B); and mixing Part I and Part II, to form the composition of claim 1 .

8 : A cured product of the composition of claim 1 .

9 : The cured product of claim 8 , wherein the cured product is optically substantially clear.

10 : A device comprising the cured product of claim 9 .

11 : The device of claim 10 , wherein the device is an optical device.

12 : The optical device of claim 11 , wherein the optical device comprises at least one of a lens, a waveguide, a window, a smart window, a diffuser, and an encapsulated semiconductor.

13 : A method comprising:
printing or spraying the composition of claim 1 onto a substrate; and curing the composition.

14 : A method of ink-jet printing, comprising:
obtaining or providing a printable composition comprising
(A) a mercapto-functional polyorganosiloxane having the unit formula
[(CH 3 ) 3 SiO 1/2 ] x [(CH 3 ) 2 SiO] y [R(CH 3 )SiO] z

wherein x is about 0.01 to about 0.1, y is about 0 to about 0.94, z is about 0.05 to about 0.99, and at each occurrence R is independently a mercapto(C 1-30 )hydrocarbyl group;
(B) at least one of
(B1) a polyorganosiloxane comprising at least two aliphatic unsaturated carbon-carbon bonds, and
(B2) an organic molecule comprising at least two aliphatic unsaturated carbon-carbon bonds;

(D) a photoinitiator;
printing the printable composition onto a substrate with an ink-jet printer; and curing the printed printable composition.

15 : A composition comprising:
(A) a mercapto-functional polyorganosiloxane having the unit formula
[(CH 3 ) 3 SiO 1/2 ] x [(CH 3 ) 2 SiO] y [R(CH 3 )SiO] z
wherein x is about 0.01 to about 0.1, y is about 0 to about 0.94, z is about 0.05 to about 0.99, and at each occurrence R is a mercaptopropyl group, and wherein Component (A) is present in the composition at about 40 wt % to about 85 wt %;
(B) at least one of
(B1) a polyorganosiloxane comprising at least two aliphatic unsaturated carbon-carbon bonds, and
(B2) an organic molecule comprising at least two aliphatic unsaturated carbon-carbon bonds,
wherein Component (B) is present in the composition at about 10 wt % to about 60 wt %;
(C) a filler comprising fumed silica having a primary particle size of about 5 to about 100 nm, wherein the filler is substantially transparent to light having a wavelength of about 280 nm to about 400 nm, the filler has a refractive index of about 1.44 to about 1.48 and 633 nm at standard temperature and pressure, and wherein Component (C) is present in the composition at about 1 wt % to about 40 wt %; and (D) a UV photoinitiator, wherein Component (D) is present in the composition at about 0.5 wt % to about 5 wt %; wherein the composition is shear-thinning and UV-curable, and the composition has a refractive index of about 1.44 to about 1.48 and 633 nm at standard temperature and pressure.

16 : A cured product of the composition of claim 15 .

Assignees

• Dow Corning

Inventors

• Clapp Terry
• Hannington Jonathan
• Zhong Bianxiao

Classifications

• C09D151/085

  on to polysiloxanes · CPC title

• C09D11/101 Primary

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• C08G77/28

  sulfur-containing groups · CPC title

• C08L83/06

  containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence) · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title