Pressure bonding adhesive and adhesive coated product

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 107/02 (2006.01) C09J 7/04 (2006.01) C09J 111/02 (2006.01) C09J 133/02 (2006.01) C09J 151/04 (2006.01)

Patent

CA 2145244

A pressure bonding adhesive composition is provided for use on cellulosic substrates which will not become tacky under high temperatures, lose adhesive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age. Non-thermoplastic pigment particles and a compound selected from the group consisting of a natural rubber latex, a graft copolymer of natural rubber and acrylic monomer and a blend of the natural rubber latex and the graft copolymer are mixed together to form an adhesive with a glass transition temperature in the range of -10 to -78°C and a green strength of 0.05 to 0.75 p.s.i.. The adhesive may also optionally contain a chloroprene-methacrylic acid copolymer latex and a vinyl- methacrylic acid copolymer latex.

Composition adhésive autocollante pour substrats cellulosiques, qui ne deviennent pas poisseux à haute température, ne perdent pas leurs propriétés adhésives par contact avec des huiles de silicone, ne forment pas de bloc lors de l'empilement avant l'impression, et enfin ne perdent pas leur capacité de former des liaisons en vieillissant. Des particules de pigment non thermoplastique et un composé choisi parmi un latex de caoutchouc naturel, un copolymère de greffe d'un caoutchouc naturel et d'un monomère acrylique, et un mélange du latex de caoutchouc naturel et du copolymère de greffe sont mélangés pour former un adhésif avec une température de transition vitreuse de -10 à -78 degrés C et une résistance initiale de 0,05 à 0,75 lb/po2. L'adhésif peut facultativement renfermer aussi un latex de copolymère de chloroprène-acide méthacrylique et un latex de copolymère de vinyle-acide méthacrylique.

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