Poly hydroxybutyrate/hydroxy-valerate based hot melt adhesive

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 167/04 (2006.01) C09J 193/04 (2006.01)

Patent

CA 2079535

Hot melt adhesive compositions are prepared from 20 to 90% by weight of a linearpolyester of 3-hydroxybutyric and 3-hydroxyvaleric acids containing 9 to 35% of the hydroxyvalerate component; 10 to 80% by weight of a polar tackifier having a Ring and Ball softening point (as described by ASTM E-26) greater than about 60°C; 0 to 50% by weight of a plasticizer; 0 to 30% by weight of a wax diluent and 0-3% by weight of a stabilizer; 0-20% of a compatible polymer. But utilizing a naturally occurring, thermoplastic, biodegradable copolymer as the base polymer, these adhesives advance the state of the art of hot melt adhesives by alleviating the dependence on petroleum based materials and by allowing for the development of hot melt adhesives which either degrade naturally after coming in contact with the soil or which can be composted.

Des compositions d'adhésif thermofusible sont préparées à partir de 20 à 90 % en poids d'un polyester linéaire des acides 3-hydroxybutyrique et 3-hydroxyvalérique contenant 9 à 35 % du constituant hydroxyvalérate; 10 à 80 % en poids d'un agent collant polaire ayant un point de ramollissement par la méthode bille et anneau (telle que décrite dans la norme ASTM E-26) supérieure à environ 60 degrés C; 0 à 50 % en poids d'un plastifiant, 0 à 30 % en poids d'un diluant de cire et 0-3 % en poids d'un stabilisant; 0-20 % d'un polymère compatible. Grâce à l'utilisation d'un copolymère naturel, thermoplastique et biodégradable comme polymère de base, ces adhésifs font progresser l'art des adhésifs thermofusibles en réduisant la dépendance sur les produits pétroliers et en permettant l'élaboration d'adhésifs thermofusibles qui se dégradent naturellement après contact avec le sol ou qui peuvent être compostés.

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