Abstract: A first charge of 10 to 100 parts by weight of scrap vulcanized rubber is added to 100 parts by weight of a hydrocarbon solvent, and the resultant mixture is heated at 400.degree. to 700.degree. F. until the rubber is solubilized. At least one additional charge of scrap rubber is made to increase the percentage of rubber in the mixture to at least 60% by weight and the heating is continued until all the rubber is solubilized. The product is incorporated into new rubber articles.

Abstract: The invention relates to the process for recovery of carbon black of controlled quality from scrap-rubber vulcanizates. Scrap rubber is selected on the basis of the quality of the carbon black used in the preparation of the rubber from which the scrap is obtained. The scrap is continuously pyrolized to produce a product composed largely of the carbon black originally present in the scrap. The recovered carbon black is ground and may be used as a reinforcing agent as such, or optionally it may be pelletized to facilitate handling.

Abstract: a hot-melt adhesive is shown which contains 75 to 99 parts by weight of depolymerized scrap rubber. From 1 to 25 parts by weight of an additive are included. The additive can include an elastomer, a resin, or a filler, or any combination thereof. The depolymerized scrap rubber is produced by heating solid scrap rubber in contact with a hydrocarbon liquid at 400.degree. to 800.degree. F. for 0.1 to 50 hours.In use, the adhesive is heated and combined with two or more wood elements. When the combination cools, a composite wood structure is obtained.

Abstract: scrap rubber is pyrolyzed in the substantial absence of air and treated with steam. The steam treatment can be carried out simultaneously with the pyrolysis or subsequently or it may be carried out both in part simultaneously with the pyrolysis and subsequently. Different products are obtained.