Absorbent inserts, method of producing them and their use

Details Absorbent inserts, method of producing them and their use Absorbent inserts, method of producing them and their use

B - Operations, Transporting

32

B

B32B 27/08 (2006.01) B01J 20/26 (2006.01) B01J 20/28 (2006.01) B32B 5/22 (2006.01) B32B 23/00 (2006.01) B32B 27/00 (2006.01) B65D 81/26 (2006.01) C08F 261/04 (2006.01) C08F 281/00 (2006.01) C08F 290/06 (2006.01)

Patent

CA 2259476

The invention concerns an absorbent insert for food packaging, the liquid- absorbing component of the insert being a superabsorbent polymer which, even at high pressure loads, can permanently absorb and hold large amounts of liquid in a previously unattainable manner, protects the food from bacterial attack, and prevents the packaged goods from contamination by migrating soluble constituents of the polymer. This combination of properties of the superabsorbent used is expressed by the quotient QSAP 0.3 from the equation: retention after the tea-bag test plus absorption against pressure (AAP) at 0.3 psi divided by the amount of soluble parts, the quotient being at least 20. Superabsorbents with properties of this type are obtained by using special crosslinking agent combinations. The invention further concerns a method of producing these inserts and their use in food packaging, as an ice-substitute and for protection against leakage in packaging for transport purposes.

L'invention concerne une pièce rapportée absorbante pour emballages alimentaires dont la partie absorbant les liquides est un polymère superabsorbant qui absorbe et retient de manière durable des quantités importantes de liquide, à un niveau jamais atteint jusqu'à présent, même en cas de forte charge de pression. Ce polymère protège les aliments des dégradations bactériennes et empêche la contamination du produit emballé par des constituants solubles du polymère en migration. Cette combinaison de propriétés des superabsorbants utilisés est divisée par le quotient Q¿SAP 0,3? issu de la rétention après test dit du sachet de thé + absorption sous pression (AAP), ledit quotient étant égal à 0,3, exprimée par la quantité de parts Q¿SAP 0,3? solubles, qui s'élève au moins à 20. Les superabsorbeurs présentant ces propriétés sont obtenus par utilisation de combinaisons spéciales de réticulants. L'invention concerne en outre un procédé de production de pièces rapportées absorbantes de ce type, ainsi que leur utilisation dans des emballages alimentaires, comme substitut de glace et comme protection limitant le mouvement dans des emballages destinés au transport.

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