Silicone release agent composition, release sheet and release film

A composition and release agent technology, applied in the direction of adhesives, pressure-sensitive films/sheets, synthetic resin layered products, etc., can solve problems such as high material prices, and achieve the effects of cheap manufacturing, excellent peelability, and excellent light peeling force.

CN113226745APending Publication Date: 2021-08-06SHIN ETSU CHEM IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-08-06

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Abstract

The objective of the present invention is to provide a release agent composition that can be produced inexpensively and that comprises little fluorine-containing silicone, but despite comprising little fluorine-containing silicone has an extremely low release force with respect to a silicone adhesive and excellent post-release residual adhesive force, and to provide a release sheet and a release film having a cured product of the composition. [Solution] The silicone release agent composition contains components (A), (B), (C), and (D) but does not contain component (E). (A) 50 to 99.9 parts by mass of a linear or branched organopolysiloxane represented by general formula (1), having within one molecule no fluorine-containing organic group but at least two alkenyl group-containing organic groups and at least one aryl group-containing organic group, wherein, with respect to the total number of groups binding to a silicon atom, the proportion of the total number of the alkenyl group-containing organic groups is 0.005 to 5%, and the proportion of the total number of the aryl group-containing organic groups is 0.1% to 40%. (In the formula each R1 symbol independently represents a hydroxyl group, or a substituted or a non-substituted monovalent hydrocarbon group having 1 to 10 carbons; however, at least two of the R1 symbols represent alkenyl group-containing organic groups having 2 to 10 carbons, and at least one of the R1 symbols represents an aryl group-containing organic group having 6 to 10 carbons; and a represents an integer of 2 or greater, b represents an integer of 1 or greater, c represents an integer of 0 or greater, and d represents an integer of 0 or greater, satisfying the relationship 100 <= a+b+c+d <= 20,000). (B) 50 to 0.1 parts by mass of a linear or branched organopolysiloxane having within one molecule at least one alkenyl group-containing organic group and at least one fluorine-containing organic group, wherein the proportion of the total number of the fluorine-containing organic groups, with respect to the total number of the groups binding to a silicon atom, is 3% to 50% (however, the total amount of the components (A) and (B) is 100 parts by mass). (C) An organohydrodiene polysiloxane having within one molecule three or more hydrogen atoms binding to a silicon atom, and having no fluorine-containing organic group in an amount such that the ratio of the number of SiH groups in component (C) with respect to the total number of alkenyl groups in component (A) and component (B) is 0.5 to 15. (D) A catalytic amount of a platinum group metal-based catalyst. (E) An organohydrodiene polysiloxane having within one molecule, one or more hydrogen atoms binding to a silicon atom and having a fluorine-containing organic group.
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Description

technical field

[0001] The present invention relates to a silicone release agent composition comprising fluorine-containing silicone and fluorine-free silicone, and a release paper and a release film having a cured product of the composition. Background technique

[0002] Conventionally, for the purpose of preventing adhesion or fixation between various substrates such as paper, plastic film, and synthetic fiber cloth, and pressure-sensitive adhesive substances, a cured coating film of a silicone composition is formed on the surface of the substrate to impart peelability. , The cured film is generally called a release paper and a release film.

[0003] Among the pressure-sensitive adhesives, silicone adhesives mainly composed of organopolysiloxane are excellent in heat resistance, cold resistance, weather resistance, chemical resistance, electrical insulation, low toxicity, etc., and therefore Used for a wide range of purposes. In addition, silicone adhesives exhibit excel...

Examples

Embodiment 1～ Embodiment 3

[0298] [Example 1 to Example 3, Comparative Example 1]

[0299] Coat 1.0 g / m in terms of solid content on a PET film with a thickness of 38 μm using a bar coater 2 The obtained silicone release agent composition was heated and cured in a hot air dryer at 120° C. for 40 seconds to form a release layer to prepare a release film.

Embodiment 4～ Embodiment 8、 comparative example 2～ comparative example 9

[0301] Coat 0.3 g / m in terms of solid content on a PET film with a thickness of 38 μm using a bar coater 2 The obtained silicone release agent composition was heated and cured in a hot air dryer at 140° C. for 30 seconds to form a release layer to prepare a release film.

[0302]

[0303] (adhesive tape A)

[0304] The silicone adhesive composition used to make the adhesive tape A was prepared as follows.

[0305] (G1) 36 parts by mass of dimethyl polysiloxane represented by the following formula,

[0306] [chem 48]

[0307]

[0308] (H1) has Me 3 SiO 0.5 Unit and SiO 2 Units of polysiloxane (Me 3 SiO 0.5 Unit / SiO 2 Unit (molar ratio) = 0.85, weight average molecular weight 4,000) of 60% by mass toluene solution 106.7 parts by mass,

[0309] (1) 0.32 parts by mass of methylhydrogenpolysiloxane represented by the following formula,

[0310] [chem 49]

[0311]

[0312] 0.25 parts by mass of 1-ethynylcyclohexanol was mixed and diluted with toluene to obtain a c...