Dried rehydratable film containing agarose or gelose and process for preparing same
AssigneeProduits Chimiques Ugine Kuhlmann
InventorsEgisto Boschetti, Yvette Paule Nicole Moroux, Rene Tixier
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Abstract
Dried agarose or gelose-containing films which are rehydratable into aqueous gel films are disclosed. The dried films are prepared by first forming, on a support, an aqueous gel film containing at most 5% by weight of agarose or gelose and a water-soluble linear polymer or copolymer of acrylamide or methacrylamide. The viscosity of such polymer and copolymer in a 5% aqueous solution at 22.degree. C is about 17000 centipoises or less and preferably about 6000 centipoises or less. The aqueous gel film is then dried according to known techniques, with the linear polymer or copolymer of acrylamide or methacrylamide being included in the dried film.
Claims17
A process for preparing a dried agarose or gelose-containing film rehydratable into an aqueous gel film of agarose or gelose, said process consisting essentially of the steps of:
- 1. forming an aqueous gel film containing at most 5% by weight agarose or gelose and a water-soluble, linear polymer or copolymer of a member selected from the group consisting of acrylamide and methacrylamide, said polymer or copolymer having a viscosity of about 17,000 centipoises or less when in a 5% aqueous solution at a temperature of 22.degree. C, by pouring onto a support a hot glycero-aqueous solution containing the agarose or gelose and said polymer or copolymer and cooling said solution,
- 2.
A dried film rehydratable into an aqueous gel film of agarose or gelose and consisting essentially of agarose or gelose and a sufficient amount of a water-soluble, linear polymer or copolymer of a member selected from the group consisting of acrylamide and methacrylamide, to maintain said dried film in storage for an extended period of time, said polymer or copolymer having a viscosity of no more than 17,000 centipoises in a 5% aqueous solution at a temperature of 22.degree. C.
Dependencies are inferred from the claim text.