This organopolysiloxane composition for use in release paper or release film, said organopolysiloxane composition containing (A) an organopolysiloxane having two or more silicon atom-bonded alkenyl groups in each molecule, (B) an organohydrogen polysiloxane having two or more silicon atom-bonded hydrogen atoms (Si—H groups) on average in each molecule, (C) an organic peroxide and (D) a specific amount of a platinum group metal-based catalyst, is capable of undergoing an addition reaction with a smaller amount of the platinum group metal-based catalyst in comparison to the prior art, thereby being capable of forming a cured coating film which has a release strength equivalent to that of the prior art even in cases where a component that inhibits the catalytic activity of the platinum group metal-based catalyst is contained in the composition. In addition, this organopolysiloxane composition is capable of forming a cured coating film by means of an addition reaction even on a base material containing a catalyst poison component, on said base material conventional compositions being not able to be cured.

This organopolysiloxane composition for use in release paper or release film, said organopolysiloxane composition containing (A) an organopolysiloxane having two or more silicon atom-bonded alkenyl groups in each molecule, (B) an organohydrogen polysiloxane having two or more silicon atom-bonded hydrogen atoms (Si—H groups) on average in each molecule, (C) an organic peroxide and (D) a specific amount of a platinum group metal-based catalyst, is capable of undergoing an addition reaction with a smaller amount of the platinum group metal-based catalyst in comparison to the prior art, thereby being capable of forming a cured coating film which has a release strength equivalent to that of the prior art even in cases where a component that inhibits the catalytic activity of the platinum group metal-based catalyst is contained in the composition. In addition, this organopolysiloxane composition is capable of forming a cured coating film by means of an addition reaction even on a base material containing a catalyst poison component, on said base material conventional compositions being not able to be cured.

Release paper base paper includes a substrate; and a coating agent containing a modified polyvinyl alcohol (A) and sodium acetate, the substrate coated with the coating agent, wherein the modified polyvinyl alcohol (A) has 0.005 mol % or more and less than 10 mol % of double bonds derived from unsaturated carboxylic acid or a derivative thereof (B) in side chains, has 1.4 mol % or more and 2.0 mol % or less of 1,2-glycol bond, units, and is water soluble, and a content of the sodium acetate relative to the modified polyvinyl alcohol (A) is 0.01 mass % or more and 10 mass % or less. The release paper base paper of the present invention is excellent in sealing properties for silicone. Use of the release paper base paper allows acceleration of curing of silicone in a release layer and improvement in adhesion between the substrate and the release layer.

Release paper base paper includes a substrate; and a coating agent containing a modified polyvinyl alcohol (A) and sodium acetate, the substrate coated with the coating agent, wherein the modified polyvinyl alcohol (A) has 0.005 mol % or more and less than 10 mol % of double bonds derived from unsaturated carboxylic acid or a derivative thereof (B) in side chains, has 1.4 mol % or more and 2.0 mol % or less of 1,2-glycol bond, units, and is water soluble, and a content of the sodium acetate relative to the modified polyvinyl alcohol (A) is 0.01 mass % or more and 10 mass % or less. The release paper base paper of the present invention is excellent in sealing properties for silicone. Use of the release paper base paper allows acceleration of curing of silicone in a release layer and improvement in adhesion between the substrate and the release layer.

To provide a radiation-curable silicone composition which provides a cured product whose odor is decreased, particularly is odorless, and has excellent curability and releasing properties. A radiation-curable silicone composition including the following components (A) and (B): (A) an epoxy group-containing cation-polymerizable organopolysiloxane which is represented by the following average composition formula (1): R.sup.1.sub.aR.sup.2.sub.bSiO.sub.(4-a-b)/2 (1) and (B) an iodonium salt having a cation moiety represented by the following general formula (2) in an effective amount to cure said component (A), [(R.sup.3)—I—(R.sup.3)].sup.+ (2) wherein R.sup.3 is, independently of each other, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 15 to 26 carbon atoms, wherein said component (A) may be accompanied by any other compounds volatilizing during heating at 105 degrees C. for 3 hours, a content of said compounds is at most 2.0 mass %, based on a total amount of component (A) and said compound.

To provide a radiation-curable silicone composition which provides a cured product whose odor is decreased, particularly is odorless, and has excellent curability and releasing properties. A radiation-curable silicone composition including the following components (A) and (B): (A) an epoxy group-containing cation-polymerizable organopolysiloxane which is represented by the following average composition formula (1): R.sup.1.sub.aR.sup.2.sub.bSiO.sub.(4-a-b)/2 (1) and (B) an iodonium salt having a cation moiety represented by the following general formula (2) in an effective amount to cure said component (A), [(R.sup.3)—I—(R.sup.3)].sup.+ (2) wherein R.sup.3 is, independently of each other, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 15 to 26 carbon atoms, wherein said component (A) may be accompanied by any other compounds volatilizing during heating at 105 degrees C. for 3 hours, a content of said compounds is at most 2.0 mass %, based on a total amount of component (A) and said compound.

In accordance with the present application, there is provided a release liner and method of preparing a liner for a label assembly. The release liner includes paper having a first side that does not have a machine finish or gloss finish or a coating; and a silicone treatment applied to the first side of the paper. The method of preparing a liner for a label assembly includes applying a coat of silicone to a paper at a side of the paper that does not have a machine finish or gloss finish and is otherwise uncoated; and curing the silicone. The release liner includes paper having a silicone coat weight of 0.5 lb/ream or less.

In accordance with the present application, there is provided a release liner and method of preparing a liner for a label assembly. The release liner includes paper having a first side that does not have a machine finish or gloss finish or a coating; and a silicone treatment applied to the first side of the paper. The method of preparing a liner for a label assembly includes applying a coat of silicone to a paper at a side of the paper that does not have a machine finish or gloss finish and is otherwise uncoated; and curing the silicone. The release liner includes paper having a silicone coat weight of 0.5 lb/ream or less.

An organopolysiloxane containing at least two silicon-bonded hydroxyl groups, the reaction product of an amino-containing organoalkoxysilane with a dicarboxylic anhydride, and an organopolysiloxane containing long-chain alkyl and alkoxy groups, but free of hydroxyl groups are emulsified and dispersed in water in the presence of a surfactant to form a coating emulsion composition.

An organopolysiloxane containing at least two silicon-bonded hydroxyl groups, the reaction product of an amino-containing organoalkoxysilane with a dicarboxylic anhydride, and an organopolysiloxane containing long-chain alkyl and alkoxy groups, but free of hydroxyl groups are emulsified and dispersed in water in the presence of a surfactant to form a coating emulsion composition.