Patent TW-202006068-A (TW)
Title: Silicone composition, release paper, release film, and method for producing release paper and stripping film including a stripping agent layer made of a hardened product obtained by curing the silicone composition
Inventor: KOBAYASHI ATARU
IPC: C08J5/18
Filed: 2019-06-20
Abstract: An object of the present invention is to provide a silicone composition and a release paper having a hardened film of the composition, wherein the silicone composition provides a release agent layer having good adhesion to a substrate, particularly a plastic film substrate such as a polyester film. In addition, another object of the present invention is to provide a silicone composition having substrate functional compounds that do not separate during long-term storage or transportation so as to improve the storage stability of the silicone composition. A silicone composition including the following components (A) to (C): (A) an organopolysiloxane having two or more alkenyl groups bonded to a silicon atom in one molecule, wherein the ratio of the total number of the alkenyl groups to the total number of the groups bonded to the silicon atom is 0.01% or more and less than 4.5%, and the viscosity at 25 DEG C is 50 mPa·s or more and 10,000 mPa·s or less, and no aryl group and aralkyl group is bonded to a silicon atom; (B) a mixture including the following components (B1), (B2) and (B3): (B1) an alpha olefin which is a liquid at 25 DEG C; (B2) an organohydrogenpolysiloxane having 3 or more hydrogen atoms bonded to a silicon atom and having no aryl group and aralkyl group bondend to a silicon atom in one molecule; (B3) an organohydrogenpolysiloxane having three or more hydrogen atoms bonded to a silicon atom in one molecule, and having an aryl group and/or an aralkyl group bonded to a silicon atom, wherein the ratio of the total number of the aryl group and the aralkyl group to the total number of hydrogen atoms bonded to the silicon atom and the total number of groups bonded to the silicon atom is 8% to 50%; (C) a platinum group metal catalyst, and the amount of (A) component is: 100 parts by mass, the amount of (B1) component is: from 0.05 to15 mass parts with respect to 100 mass parts of (A) component, the amount of (B2) component is: the ratio of the number of SiH group in (B) component to the total number of alkenyl groups present in (A) component and (B) component is from 0.5 to 10 mass parts, the amount of (B3) component is: from 0.05 to 10 parts by mass with respect to 100 parts by mass of (A) component, and the ratio of the number of SiH groups in (B3) component with respect to the total number of alkenyl groups present in (A) component and (B) component is from 0.1 to 2. And the amount of (C) component is: the amount of a catalyst. Furthermore, the present invention provides a release paper or a release film, and a method for producing the release paper or the release film, wherein the release paper or the release film includes a substrate and a release agent layer arranged on at least one surface of the substrate, and the release paper or the release film is characterized in that the release agent layer is made of a hardened product obtained by curing the silicone composition.