Abstract: The invention relates to balls for sports, for example, a football, consisting of an external wear layer surrounding a bladder which also forms the body of the ball and is made from a powdered or liquid elastomeric resin comprising a polycondensation product of at least one compound of the group consisting of the dicarboxylic acids and esters of the dicarboxylic acids having a molecular weight of less than 300 with a polyalkylene-oxyglycol whose molecular weight is between 400 and 6000, and at least one diol having a molecular weight of less than 250. The external layer, suitably of rubber or leather, is secured directly to the bladder/body by, preferably, a polyurethane-base adhesive.
Type:
Grant
Filed:
October 22, 1976
Date of Patent:
June 6, 1978
Assignee:
Societe de Transformation du Caoutchouc-Sotrac