Dispenser for metering proportionate increments of polymerizable materials.

摘要

Extrudable materials (45, 46) that polymerize when mixed can be stored in a dispenser (10) that has no internal valve and contains a tubular cavity (13) of uniform cross section and a piston (26) with which the materials can be incrementally extruded. The polymerizable materials are separated by a barrier layer (47) extending between the polymerizable materials over the length of the cavity. The material of the barrier layer is insoluble in each of the polymerizable materials while being dispersible in a mixture of them. The polymerizable materials and the material of the barrier layer have sufficiently similar rheologies at the temperature at which they are to be extruded from the dispenser to ensure against intermixing until after they emerge from the outlets (21).