Low modulus elastomer

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/16 (2006.01) C08L 23/20 (2006.01) C09J 123/16 (2006.01) C09J 123/20 (2006.01) C08L 23/22 (2006.01)

Patent

CA 2293473

An elastomer has a modulus intermediate between that of a conventional rubber and a gel. The elastomer includes (a) between 20 and 45 parts by weight of a semicrystalline elastomer having between 1 and 15 % crystallinity and (b) between 80 and 55 parts by weight of a compatible liquid elastomer having a number-average molecular weight of between 1,500 and 8,500. The elastomer's modulus is sufficiently high to enable it to be fabricated into handleable articles, but is sufficiently low so that is provides effective sealing of substrates it covers without the need for introducing a separate sealing material such as a mastic or adhesive.

Un élastomère présente un module intermédiaire entre celui d'un caoutchouc classique et celui d'un gel. L'élastomère comprend (a) 20 à 45 parties en poids d'un élastomère semi-cristallin présentant une cristallinité de 1 à 15 % et (b) 80 à 55 parties en poids d'un élastomère liquide compatible ayant une masse moléculaire moyenne en nombre comprise entre 1500 et 8500. Le module de l'élastomère est suffisamment élevé pour permettre de l'utiliser dans la fabrication d'articles maléables, mais il est suffisamment bas pour permettre d'obtenir une étanchéité efficace sur des substrats qu'il recouvre sans l'introduction d'une matière d'étanchéité séparée tel qu'un mastic ou un adhésif.

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