Edward G. Millen - Princeton NJ Frank K. Pypcznski - Lawrenceville NJ
Assignee:
Thiokol Corporation - Newtown PA
International Classification:
B29D 702
US Classification:
15624411
Abstract:
The use of polysulfide rubbers cured with zinc oxide and tetramethylthiuram disulfide and other sulfur containing cure accelerators for polyisoprene rubbers in hot applied processes and articles formed thereby are disclosed. The compositions are useful as hot applied sealants and in the extrusion of hoses and similar rubber articles.
Cure Accelerator For Polysulfide Polymer Based Sealants
cure rate of liquid polysulfide polymer based sealants may be accelerated by incorporation of tetramethylene sulfone therein. This is particularly of importance in one part sealants cured by ZnO. sub. 2.
Curing Of Polysulfide Liquid Polymers With Zinc Oxide And A Source Of Copper Ions
A curable liquid polysulfide polymer composition having improved toughness and tear resistance, comprising a major portion of a liquid organic polysulfide polymer having a molecular weight of about 500 to about 10,000 atomic mass units; zinc oxide; and a source of copper ions, preferably cupric acetate. In the preferred composition the liquid organic polysulfide polymer is a mixture of two polymers having different molecular weights.