Release control agent, silicone release agent composition containing same, release sheet, and laminated body
View Patent ↗The present invention provides a release control agent for producing a release agent composition that has sufficient releasability from a silicone-based adhesive agent and that exhibits excellent releasability even when pressure is applied to a cured product; a silicone release agent composition containing such a release control agent; a release sheet having a cured layer formed from the cured product of the silicone release agent composition; and a laminated body having the release sheet and an adhesive layer. The present invention includes a release control agent containing from 15 to 29 mol % of a fluorine atom-containing organic group in each molecule, and an organopolysiloxane having no hydrosilylation reactive group; a silicone release agent composition containing such a release control agent; a release sheet; and a laminated body.
1. A silicone release agent composition comprising:
(A) an organopolysiloxane having at least one fluorine atom-containing organic group and at least two alkenyl groups in each molecule;
(B) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms in each molecule;
(C) a release control agent comprising an organopolysiloxane having from 20.5 to 26.2 mol % of a fluorine atom-containing organic group in each molecule, and having no hydrosilylation reactive group, wherein the content of the fluorine atom-containing organic group is calculated as a proportion of siloxane units having a fluorine atom-containing organic group among all the siloxane units constituting each organopolysiloxane molecule; and
(D) a hydrosilylation reaction catalyst.
2. The silicone release agent composition according to claim 1 , wherein a content of the organohydrogenpolysiloxane (B) is from 0.1 to 40 parts by mass per 100 parts by mass of the organopolysiloxane (A).
3. The silicone release agent composition according to claim 1 , wherein a content of the release control agent (C) is from 0.01 to 20 parts by mass per 100 parts by mass of the organopolysiloxane (A).
4. The silicone release agent composition according to claim 1 , wherein at least one molecular terminal group of the organopolysiloxane of component (C) is a trimethylsilyl group.
5. The silicone release agent composition according to claim 1 , wherein the fluorine atom-containing organic group of component (C) is a group represented by C n F 2+1 —R—, C n F2 n+1 -R—O—R—, or F(CF(CF 3 )CF 2 O) n CF(CF 3 )—R—O—R—, wherein R is each independently a divalent hydrocarbon group, and n is an integer of 1 to 20.
6. The silicone release agent composition according to claim 1 , wherein a degree of polymerization of the organopolysiloxane of component (C) is from 100 to 10,000.
7. A release sheet comprising:
a cured layer consisting of a cured product formed from the silicone release agent composition according to claim 1 ; and
a sheet-like substrate.
8. The release sheet according to claim 7 , wherein the sheet-like substrate is paper, a plastic film, or fabric.
9. A laminated body comprising:
the release sheet according to claim 7 ; and
an adhesive layer.