Hydrogels that degrade under appropriate conditions of pH and temperature by virtue of crosslinking compounds that cleave through an elimination reaction are described. The hydrogels may be used for delivery of various agents, such as pharmaceuticals.
Polymers, especially hydrocarbon polymers containing ethylenic unsaturation such as vulcanised diene rubbers, can be bonded together by activating the surfaces to be bonded by treatment with a chemical free radical initiator and bringing the treated surfaces into direct contact. The use of a separate adhesive is unnecessary.
Hydrogels that degrade under appropriate conditions of pH and temperature by virtue of crosslinking compounds that cleave through an elimination reaction are described. The hydrogels may be used for delivery of various agents, such as pharmaceuticals.
Methods and articles for maintaining hydantoinylated polymers in a biocidally active state
申请人:Bridges A. Michael
公开号:US20050104034A1
公开(公告)日:2005-05-19
A composition and the method for sustaining the biocidal activity of chlorinated polystyrene hydantoin beads. The method comprises supplying a continuous low level halogen concentration to the chlorinated polystyrene hydantoin beads in the water to be treated that flows in contact with the chlorinated polystyrene hydantoin beads, resulting in treated water suitable for drinking.