A vulcanizing agent for rubber is incorporated into a polymer which is substantially noncrosslinkable by the agent but which is fusible with rubber upon milling. The resulting polymeric mixture and a vulcanizable rubber are formed into strips which are joined together along the lengths thereof to form an elongated, two-component tape wherein the rubber vulcanizing agent is carried in the nonreactive polymer. Sections of the tape can be milled to produce a vulcanizable compound by blending the polymeric component with the rubber component, thus obviating any need for separate addition of a rubber vulcanizing agent. The tape can be wound on a reel and stored until the need for blending arises. Premature reaction of the vulcanizing agent with the rubber is prevented since it is bound within the noncrosslinkable polymer. In one highly useful application, the two-component tape is fed continuously to an extruder wherein blending of the components is effected, and whereby the resulting blend is continuously extruded as a self-curing sealant tape which is simultaneously applied to a structural joint requiring a seal.
A method for joining waterproof vulcanized synthetic rubber sheets is described wherein a cold-vulcanizable adhesive tape having Mooney viscosity [ML.sub.1+5 (100.degree. C.)] of from 5 to 25 and an autoadhesion property, and which contains a rubbery polymer comprising (1) ethylene-propylene terpolymer, butyl rubber, or a blend of ethylene-propylene terpolymer and butyl rubber, (2) a vulcanizing agent, (3) a vulcanization accelerator, (4) an adhesive agent, and (5) a softening agent is placed between overlapped areas of the waterproof vulcanized synthetic rubber sheets, and said adhesive tape is cold-vulcanized to thereby join the sheets.
A thin barrier is provided between two reactive masses, as during extrusion thereof, to block their reaction until such time as they are intermixed, as by kneading.
Sealing web of at least one layer on the basis of mixed polymerizates of ethylene and propylene with or without ter-component (EPDM/EPM). Mixed polymerizates with an ethylene content of at least 50 parts by weight are heat-treated with a reinforcement resin and form through heat treatment an interpenetrating network of chemically non-cross-linked EPDM/EPM and cross-linked reinforcement resin, which can be welded together thermally and/or by dissolving or swelling agents.
The method of making a deformable sealant strip having a continuous strip of rigid corrugated material embedded longitudinally within mastic material wherein a continuous linear-rigid spacer is first corrugated and then fed in this condition into an extruder cross head wherein such rigid corrugated spacer is encompassed by a mastic. The strip is coiled for subsequent use in retrofitting double pane windows as well as making dual insulated windows. The extruder that receives the rigid corrugated spacer in its crosshead provides a mastic that surrounds and encompasses the spacer without deforming it.
