Abstract:
Simple metal salts are found to be useful as primary accelerators for the sulfur vulcanization of nonpolar, unsaturated hydrocarbon rubbers. Useful metals include those of Group I-A, Group II-A, and transition metals of the periodic table including mixtures thereof. The metals are usually employed in the form of metallo-organic compounds. However, certain inorganic metal salts such as metal halides, carbonates and nitrates are also applicable.
Abstract:
An adhesive composition comprises an iso-olefine polymer or copolymer, a non-reactive para-hydrocarbon substituted phenol-aldehyde resin and a tetra- or penta-hydric alcohol ester of a modified wood rosin, the resin and ester being present in a weight ratio of 0,3 : 1-15 : 1. Polymers specified are polyisobutylene, butyl rubber and halogenated butyl rubber (including rubbers derived from 3-methyl-butene-1 and 4-methyl-pentene-1 as well as isobutylene). Phenol-aldehyde resins specified are those obtained by condensing tert. butyl-, octyl-, dodecyl-, phenyl-, benzyl- or cyclohexyl-phenol with formaldehyde. Modified wood rosin esters specified are those obtained from wood rosin modified by an organic dibasic acid anhydride, e.g. maleic or citraconic anhydride, or polymerized to the dimer or trimer state, and then esterified with a polyhydric alcohol, e.g. erythritol, pentaerythritol or arabitol. The compositions may be cured by incorporating therein curing agents and accelerators for the polymer, particularly butyl rubber, followed by heat treatment at 200 DEG -400 DEG F. The compositions may also contain carbon black, mineral fillers and pigments (listed), stearic acid, extending and processing oils, plasticizers, scorch retarders, e.g. copper stearate, antioxidants and fungicides, e.g. copper oxide. Specification 565,974 is referred to.