Invention Grant
- Patent Title: Silicone composition, a release sheet, a release film and methods for preparing the release sheet and the release film
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Application No.: US17256724Application Date: 2019-06-27
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Publication No.: US11884778B2Publication Date: 2024-01-30
- Inventor: Ataru Kobayashi , Ken Nakayama , Toshiaki Ihara
- Applicant: Shin-Etsu Chemical Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: Shin-Etsu Chemical Co., Ltd.
- Current Assignee: Shin-Etsu Chemical Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Myers Bigel, P.A.
- Priority: JP 18126697 2018.07.03
- International Application: PCT/JP2019/025736 2019.06.27
- International Announcement: WO2020/009007A 2020.01.09
- Date entered country: 2020-12-29
- Main IPC: C08G77/12
- IPC: C08G77/12 ; B05D5/10 ; B05D7/04 ; C08G77/08 ; C08L83/04 ; C09J183/04
Abstract:
The object of the present invention is to provide a silicone composition which provides a release coating having excellent adhesion to a substrate, in particular a plastic film substrate, such as a polyester film. Further, an object of the present invention is to provide a release sheet having a cured coating of the silicon composition. It is also an object of the present invention to provide a silicone composition which has improved storage stability and does not cause separation of the functional compound during long-term storage or transportation. The present invention provides a silicone composition comprising the following components (A) to (C):
(A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in a molecule, having a viscosity at 25 degrees C. in the range of from 50 mPa·s to 10,000 mPa·s, and having no aryl nor aralkyl group bonded to a silicon atom, wherein a percentage of the number of the alkenyl groups relative to the number of groups each bonded to a silicon atom is from 0.01% to less than 4.5%;
(B) a mixture comprising the following components (B1), (B2) and (B3):
(B1) an alpha-olefin which is liquid at 25 degrees C., in an amount of 0.05 to 15 parts by mass, relative to 100 parts by mass of component (A),
(B2) an organohydrogenpolysiloxane having at least three hydrogen atoms each bonded to a silicon atom in a molecule, and having no aryl nor aralkyl group bonded to a silicon atom, wherein a ratio of the number of the SiH groups present in component (B2) to a total number of the alkenyl groups present in components (A) and (B) is 0.5 to 10;
(B3) an organohydrogenpolysiloxane having at least three hydrogen atoms each bonded to a silicon atom in a molecule, and having an aryl group and/or an aralkyl group each bonded to a silicon atom such that a percentage of the number of the aryl group and the aralkyl group relative to a total number of hydrogen atoms and groups each bonded to a silicon atom is 8% to 50%, wherein the amount of component (B3) is from 0.05 to 10 parts by mass, relative to 100 parts by mass of component (A), and a ratio of the number of the SiH groups present in component (B3) to a total number of the alkenyl groups present in components (A) and (B) is 0.1 to 2; and
(C) a catalytic amount of a platinum group metal catalyst.
(A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in a molecule, having a viscosity at 25 degrees C. in the range of from 50 mPa·s to 10,000 mPa·s, and having no aryl nor aralkyl group bonded to a silicon atom, wherein a percentage of the number of the alkenyl groups relative to the number of groups each bonded to a silicon atom is from 0.01% to less than 4.5%;
(B) a mixture comprising the following components (B1), (B2) and (B3):
(B1) an alpha-olefin which is liquid at 25 degrees C., in an amount of 0.05 to 15 parts by mass, relative to 100 parts by mass of component (A),
(B2) an organohydrogenpolysiloxane having at least three hydrogen atoms each bonded to a silicon atom in a molecule, and having no aryl nor aralkyl group bonded to a silicon atom, wherein a ratio of the number of the SiH groups present in component (B2) to a total number of the alkenyl groups present in components (A) and (B) is 0.5 to 10;
(B3) an organohydrogenpolysiloxane having at least three hydrogen atoms each bonded to a silicon atom in a molecule, and having an aryl group and/or an aralkyl group each bonded to a silicon atom such that a percentage of the number of the aryl group and the aralkyl group relative to a total number of hydrogen atoms and groups each bonded to a silicon atom is 8% to 50%, wherein the amount of component (B3) is from 0.05 to 10 parts by mass, relative to 100 parts by mass of component (A), and a ratio of the number of the SiH groups present in component (B3) to a total number of the alkenyl groups present in components (A) and (B) is 0.1 to 2; and
(C) a catalytic amount of a platinum group metal catalyst.
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