Heat sensitizable latex

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 9/10 (2006.01) C08C 1/14 (2006.01) C08F 2/24 (2006.01) C08F 36/04 (2006.01) C08L 9/04 (2006.01)

Patent

CA 2199224

This invention discloses heat sensitizable latices and a process for synthesizing heat sensitizable latices. This invention more specifically discloses a process for preparing a heat sensitizable latex which comprises the steps of (1) polymerizing at least one conjugated diolefin monomer in an aqueous polymerization medium by free radical polymerization in the presence of an emulsifier system which is comprised of a fatty ethoxylated monomaleate and optionally an alkyl monomaleate to produce a first latex composition; and (2) adding a water soluble organically modified polysiloxane to the first latex composition to produce the heat sensitizable latex. The present invention further discloses a heat sensitizable latex composition which is comprised of (1) at least one rubbery polymer; (2) water; (3) an emulsifier system which is comprised of a fatty ethoxylated monomaleate and optionally an alkyl monomaleate; and (4) at least one water-soluble organically modified polysiloxane.

Latex thermosensibles et méthode pour la synthèse de latex thermosensibles. Plus spécifiquement, méthode pour préparer un latex thermosensible, comprenant les étapes suivantes : 1) polymérisation d'au moins un monomère dioléfinique conjugué dans un milieu de polymérisation aqueux, par des radicaux libres, en présence d'un système émulsifiant composé d'un monomaléate gras éthoxylé et, facultativement, d'un monomaléate d'alkyle, pour l'obtention d'une première composition de latex; 2) addition d'un polysiloxane hydrosoluble modifié par voie organique à la première composition de latex, pour l'obtention du latex thermosensible. De plus, la présente invention présente une composition de latex thermosensible, composée des éléments suivants : 1) au moins un polymère caoutchouteux; 2) eau ; 3) système émulsifiant, constitué d'un monomaléate gras éthoxylé et, facultativement, d'un monomaléate d'alkyle; 4) au moins un polysiloxane hydrosoluble modifié par voie organique.

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