Silicone coating formulations and planographic printing...

C - Chemistry – Metallurgy – 08 – L

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C08L 83/04 (2006.01) C09D 183/04 (2006.01) G03F 7/075 (2006.01)

Patent

CA 2073253

Two-component silicone formulations consisting of a high-molecular-weight silicone component and a low-molecular- weight silicone polymer. The components are combined in varying proportions with a cross-linking agent to produce compositions of varying viscosities and dispersibilities. The high-molecular-weight component is linear polysiloxane compound with a molecular weight of at least 300,000, and preferably 500,000 or higher. The low-molecular-weight component has a similar structure, with a molecular weight no greater than 70,000. Various substitutions are made to facilitate cross-linking among components. The formulations are well-suited to coating applications, and can advantageously be used as coatings for planographic plates.

Formulations de silicone à deux constituants comprenant un composant de silicone à poids moléculaire élevé et un polymère de silicone de faible poids moléculaire. Les constituants sont mélangés dans ds proportions variables avec un agent de réticulation pour produire des compositions de viscosités et de dispersibilités variables. Le constituant de poids moléculaire élevé est un composé de polysiloxane linéaire possédant un poids moléculaire d'au moins 300,000, et de préférence de 500,000 ou plus. Le constituant de faible poids moléculaire possède une structure similaire, avec un poids moléculaire qui n'est pas supérieur à 70,000. On procède à diverses substitutions pour faciliter la réticulation entre les constituants. Les formulations conviennent bien à des applications de revêtements, et peuvent être employées utilement en tant que revêtements pour des plaques planographiques.

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